addons/point_of_sale/static/src/js/models.js

   1 function openerp_pos_models(instance, module){ //module is instance.point_of_sale
   2     var QWeb = instance.web.qweb;
   3         var _t = instance.web._t;
   4
   5     var round_di = instance.web.round_decimals;
   6     var round_pr = instance.web.round_precision
   7
   8     // The PosModel contains the Point Of Sale's representation of the backend.
   9     // Since the PoS must work in standalone ( Without connection to the server )
  10     // it must contains a representation of the server's PoS backend.
  11     // (taxes, product list, configuration options, etc.)  this representation
  12     // is fetched and stored by the PosModel at the initialisation.
  13     // this is done asynchronously, a ready deferred alows the GUI to wait interactively
  14     // for the loading to be completed
  15     // There is a single instance of the PosModel for each Front-End instance, it is usually called
  16     // 'pos' and is available to all widgets extending PosWidget.
  17
  18     module.PosModel = Backbone.Model.extend({
  19         initialize: function(session, attributes) {
  20             Backbone.Model.prototype.initialize.call(this, attributes);
  21             var  self = this;
  22             this.session = session;
  23             this.flush_mutex = new $.Mutex();                   // used to make sure the orders are sent to the server once at time
  24             this.pos_widget = attributes.pos_widget;
  25
  26             this.proxy = new module.ProxyDevice(this);              // used to communicate to the hardware devices via a local proxy
  27             this.barcode_reader = new module.BarcodeReader({'pos': this, proxy:this.proxy, patterns: {}});  // used to read barcodes
  28             this.proxy_queue = new module.JobQueue();           // used to prevent parallels communications to the proxy
  29             this.db = new module.PosDB();                       // a local database used to search trough products and categories & store pending orders
  30             this.debug = jQuery.deparam(jQuery.param.querystring()).debug !== undefined;    //debug mode
  31
  32             // Business data; loaded from the server at launch
  33             this.accounting_precision = 2; //TODO
  34             this.company_logo = null;
  35             this.company_logo_base64 = '';
  36             this.currency = null;
  37             this.shop = null;
  38             this.company = null;
  39             this.user = null;
  40             this.users = [];
  41             this.partners = [];
  42             this.cashier = null;
  43             this.cashregisters = [];
  44             this.bankstatements = [];
  45             this.taxes = [];
  46             this.pos_session = null;
  47             this.config = null;
  48             this.units = [];
  49             this.units_by_id = {};
  50             this.pricelist = null;
  51             this.order_sequence = 1;
  52             window.posmodel = this;
  53
  54             // these dynamic attributes can be watched for change by other models or widgets
  55             this.set({
  56                 'synch':            { state:'connected', pending:0 },
  57                 'orders':           new module.OrderCollection(),
  58                 'selectedOrder':    null,
  59             });
  60
  61             this.bind('change:synch',function(pos,synch){
  62                 clearTimeout(self.synch_timeout);
  63                 self.synch_timeout = setTimeout(function(){
  64                     if(synch.state !== 'disconnected' && synch.pending > 0){
  65                         self.set('synch',{state:'disconnected', pending:synch.pending});
  66                     }
  67                 },3000);
  68             });
  69
  70             this.get('orders').bind('remove', function(order,_unused_,options){
  71                 self.on_removed_order(order,options.index,options.reason);
  72             });
  73
  74             // We fetch the backend data on the server asynchronously. this is done only when the pos user interface is launched,
  75             // Any change on this data made on the server is thus not reflected on the point of sale until it is relaunched.
  76             // when all the data has loaded, we compute some stuff, and declare the Pos ready to be used.
  77             this.ready = this.load_server_data()
  78                 .then(function(){
  79                     if(self.config.use_proxy){
  80                         return self.connect_to_proxy();
  81                     }
  82                 });
  83
  84         },
  85
  86         // releases ressources holds by the model at the end of life of the posmodel
  87         destroy: function(){
  88             // FIXME, should wait for flushing, return a deferred to indicate successfull destruction
  89             // this.flush();
  90             this.proxy.close();
  91             this.barcode_reader.disconnect();
  92             this.barcode_reader.disconnect_from_proxy();
  93         },
  94         connect_to_proxy: function(){
  95             var self = this;
  96             var  done = new $.Deferred();
  97             this.barcode_reader.disconnect_from_proxy();
  98             this.pos_widget.loading_message(_t('Connecting to the PosBox'),0);
  99             this.pos_widget.loading_skip(function(){
 100                     self.proxy.stop_searching();
 101                 });
 102             this.proxy.autoconnect({
 103                     force_ip: self.config.proxy_ip || undefined,
 104                     progress: function(prog){
 105                         self.pos_widget.loading_progress(prog);
 106                     },
 107                 }).then(function(){
 108                     if(self.config.iface_scan_via_proxy){
 109                         self.barcode_reader.connect_to_proxy();
 110                     }
 111                 }).always(function(){
 112                     done.resolve();
 113                 });
 114             return done;
 115         },
 116
 117         // helper function to load data from the server. Obsolete use the models loader below.
 118         fetch: function(model, fields, domain, ctx){
 119             this._load_progress = (this._load_progress || 0) + 0.05;
 120             this.pos_widget.loading_message(_t('Loading')+' '+model,this._load_progress);
 121             return new instance.web.Model(model).query(fields).filter(domain).context(ctx).all()
 122         },
 123
 124         // Server side model loaders. This is the list of the models that need to be loaded from
 125         // the server. The models are loaded one by one by this list's order. The 'loaded' callback
 126         // is used to store the data in the appropriate place once it has been loaded. This callback
 127         // can return a deferred that will pause the loading of the next module.
 128         // a shared temporary dictionary is available for loaders to communicate private variables
 129         // used during loading such as object ids, etc.
 130         models: [
 131         {
 132             model:  'res.users',
 133             fields: ['name','company_id'],
 134             domain: function(self){ return [['id','=',self.session.uid]]; },
 135             loaded: function(self,users){ self.user = users[0]; },
 136         },{
 137             model:  'res.company',
 138             fields: [ 'currency_id', 'email', 'website', 'company_registry', 'vat', 'name', 'phone', 'partner_id' ],
 139             domain: function(self){ return [['id','=',self.user.company_id[0]]]; },
 140             loaded: function(self,companies){ self.company = companies[0]; },
 141         },{
 142             model:  'product.uom',
 143             fields: [],
 144             domain: null,
 145             loaded: function(self,units){
 146                 self.units = units;
 147                 var units_by_id = {};
 148                 for(var i = 0, len = units.length; i < len; i++){
 149                     units_by_id[units[i].id] = units[i];
 150                     units[i].groupable = ( units[i].category_id[0] === 1 );
 151                     units[i].is_unit   = ( units[i].id === 1 );
 152                 }
 153                 self.units_by_id = units_by_id;
 154             }
 155         },{
 156             model:  'res.users',
 157             fields: ['name','ean13'],
 158             domain: null,
 159             loaded: function(self,users){ self.users = users; },
 160         },{
 161             model:  'res.partner',
 162             fields: ['name','street','city','country_id','phone','zip','mobile','email','ean13','write_date'],
 163             domain: null,
 164             loaded: function(self,partners){
 165                 self.partners = partners;
 166                 self.db.add_partners(partners);
 167             },
 168         },{
 169             model:  'account.tax',
 170             fields: ['name','amount', 'price_include', 'type'],
 171             domain: null,
 172             loaded: function(self,taxes){ self.taxes = taxes; },
 173         },{
 174             model:  'pos.session',
 175             fields: ['id', 'journal_ids','name','user_id','config_id','start_at','stop_at','sequence_number','login_number'],
 176             domain: function(self){ return [['state','=','opened'],['user_id','=',self.session.uid]]; },
 177             loaded: function(self,pos_sessions){
 178                 self.pos_session = pos_sessions[0];
 179
 180                 var orders = self.db.get_orders();
 181                 for (var i = 0; i < orders.length; i++) {
 182                     self.pos_session.sequence_number = Math.max(self.pos_session.sequence_number, orders[i].data.sequence_number+1);
 183                 }
 184             },
 185         },{
 186             model: 'pos.config',
 187             fields: [],
 188             domain: function(self){ return [['id','=', self.pos_session.config_id[0]]]; },
 189             loaded: function(self,configs){
 190                 self.config = configs[0];
 191                 self.config.use_proxy = self.config.iface_payment_terminal ||
 192                                         self.config.iface_electronic_scale ||
 193                                         self.config.iface_print_via_proxy  ||
 194                                         self.config.iface_scan_via_proxy   ||
 195                                         self.config.iface_cashdrawer;
 196
 197                 self.barcode_reader.add_barcode_patterns({
 198                     'product':  self.config.barcode_product,
 199                     'cashier':  self.config.barcode_cashier,
 200                     'client':   self.config.barcode_customer,
 201                     'weight':   self.config.barcode_weight,
 202                     'discount': self.config.barcode_discount,
 203                     'price':    self.config.barcode_price,
 204                 });
 205             },
 206         },{
 207             model: 'stock.location',
 208             fields: [],
 209             domain: function(self){ return [['id','=', self.config.stock_location_id[0]]]; },
 210             loaded: function(self, locations){ self.shop = locations[0]; },
 211         },{
 212             model:  'product.pricelist',
 213             fields: ['currency_id'],
 214             domain: function(self){ return [['id','=',self.config.pricelist_id[0]]]; },
 215             loaded: function(self, pricelists){ self.pricelist = pricelists[0]; },
 216         },{
 217             model: 'res.currency',
 218             fields: ['symbol','position','rounding','accuracy'],
 219             domain: function(self){ return [['id','=',self.pricelist.currency_id[0]]]; },
 220             loaded: function(self, currencies){
 221                 self.currency = currencies[0];
 222             },
 223         },{
 224             model: 'product.packaging',
 225             fields: ['ean','product_tmpl_id'],
 226             domain: null,
 227             loaded: function(self, packagings){
 228                 self.db.add_packagings(packagings);
 229             },
 230         },{
 231             model:  'pos.category',
 232             fields: ['id','name','parent_id','child_id','image'],
 233             domain: null,
 234             loaded: function(self, categories){
 235                 self.db.add_categories(categories);
 236             },
 237         },{
 238             model:  'product.product',
 239             fields: ['display_name', 'list_price','price','pos_categ_id', 'taxes_id', 'ean13', 'default_code',
 240                      'to_weight', 'uom_id', 'uos_id', 'uos_coeff', 'mes_type', 'description_sale', 'description',
 241                      'product_tmpl_id'],
 242             domain:  function(self){ return [['sale_ok','=',true],['available_in_pos','=',true]]; },
 243             context: function(self){ return { pricelist: self.pricelist.id, display_default_code: false }; },
 244             loaded: function(self, products){
 245                 self.db.add_products(products);
 246             },
 247         },{
 248             model:  'account.bank.statement',
 249             fields: ['account_id','currency','journal_id','state','name','user_id','pos_session_id'],
 250             domain: function(self){ return [['state', '=', 'open'],['pos_session_id', '=', self.pos_session.id]]; },
 251             loaded: function(self, bankstatements, tmp){
 252                 self.bankstatements = bankstatements;
 253
 254                 tmp.journals = [];
 255                 _.each(bankstatements,function(statement){
 256                     tmp.journals.push(statement.journal_id[0]);
 257                 });
 258             },
 259         },{
 260             model:  'account.journal',
 261             fields: [],
 262             domain: function(self,tmp){ return [['id','in',tmp.journals]]; },
 263             loaded: function(self, journals){
 264                 self.journals = journals;
 265
 266                 // associate the bank statements with their journals.
 267                 var bankstatements = self.bankstatements;
 268                 for(var i = 0, ilen = bankstatements.length; i < ilen; i++){
 269                     for(var j = 0, jlen = journals.length; j < jlen; j++){
 270                         if(bankstatements[i].journal_id[0] === journals[j].id){
 271                             bankstatements[i].journal = journals[j];
 272                             bankstatements[i].self_checkout_payment_method = journals[j].self_checkout_payment_method;
 273                         }
 274                     }
 275                 }
 276                 self.cashregisters = bankstatements;
 277             },
 278         },{
 279             label: 'fonts',
 280             loaded: function(self){
 281                 var fonts_loaded = new $.Deferred();
 282                 // Waiting for fonts to be loaded to prevent receipt printing
 283                 // from printing empty receipt while loading Inconsolata
 284                 // ( The font used for the receipt )
 285                 waitForWebfonts(['Lato','Inconsolata'], function(){
 286                     fonts_loaded.resolve();
 287                 });
 288                 // The JS used to detect font loading is not 100% robust, so
 289                 // do not wait more than 5sec
 290                 setTimeout(function(){
 291                     fonts_loaded.resolve();
 292                 },5000);
 293
 294                 return fonts_loaded;
 295             },
 296         },{
 297             label: 'pictures',
 298             loaded: function(self){
 299                 self.company_logo = new Image();
 300                 self.company_logo.crossOrigin = 'anonymous';
 301                 var  logo_loaded = new $.Deferred();
 302                 self.company_logo.onload = function(){
 303                     var img = self.company_logo;
 304                     var ratio = 1;
 305                     var targetwidth = 300;
 306                     var maxheight = 150;
 307                     if( img.width !== targetwidth ){
 308                         ratio = targetwidth / img.width;
 309                     }
 310                     if( img.height * ratio > maxheight ){
 311                         ratio = maxheight / img.height;
 312                     }
 313                     var width  = Math.floor(img.width * ratio);
 314                     var height = Math.floor(img.height * ratio);
 315                     var c = document.createElement('canvas');
 316                         c.width  = width;
 317                         c.height = height
 318                     var ctx = c.getContext('2d');
 319                         ctx.drawImage(self.company_logo,0,0, width, height);
 320
 321                     self.company_logo_base64 = c.toDataURL();
 322                     window.logo64 = self.company_logo_base64;
 323                     logo_loaded.resolve();
 324                 };
 325                 self.company_logo.onerror = function(){
 326                     logo_loaded.reject();
 327                 };
 328                 self.company_logo.src = window.location.origin + '/web/binary/company_logo';
 329
 330                 return logo_loaded;
 331             },
 332         },
 333         ],
 334
 335         // loads all the needed data on the sever. returns a deferred indicating when all the data has loaded.
 336         load_server_data: function(){
 337             var self = this;
 338             var loaded = new $.Deferred();
 339             var progress = 0;
 340             var progress_step = 1.0 / self.models.length;
 341             var tmp = {}; // this is used to share a temporary state between models loaders
 342
 343             function load_model(index){
 344                 if(index >= self.models.length){
 345                     loaded.resolve();
 346                 }else{
 347                     var model = self.models[index];
 348                     self.pos_widget.loading_message(_t('Loading')+' '+(model.label || model.model || ''), progress);
 349                     var fields =  typeof model.fields === 'function'  ? model.fields(self,tmp)  : model.fields;
 350                     var domain =  typeof model.domain === 'function'  ? model.domain(self,tmp)  : model.domain;
 351                     var context = typeof model.context === 'function' ? model.context(self,tmp) : model.context;
 352                     progress += progress_step;
 353
 354                     if( model.model ){
 355                         new instance.web.Model(model.model).query(fields).filter(domain).context(context).all()
 356                             .then(function(result){
 357                                 try{    // catching exceptions in model.loaded(...)
 358                                     $.when(model.loaded(self,result,tmp))
 359                                         .then(function(){ load_model(index + 1); },
 360                                               function(err){ loaded.reject(err); });
 361                                 }catch(err){
 362                                     loaded.reject(err);
 363                                 }
 364                             },function(err){
 365                                 loaded.reject(err);
 366                             });
 367                     }else if( model.loaded ){
 368                         try{    // catching exceptions in model.loaded(...)
 369                             $.when(model.loaded(self,tmp))
 370                                 .then(  function(){ load_model(index +1); },
 371                                         function(err){ loaded.reject(err); });
 372                         }catch(err){
 373                             loaded.reject(err);
 374                         }
 375                     }else{
 376                         load_model(index + 1);
 377                     }
 378                 }
 379             }
 380
 381             try{
 382                 load_model(0);
 383             }catch(err){
 384                 loaded.reject(err);
 385             }
 386
 387             return loaded;
 388         },
 389
 390         // reload the list of partner, returns as a deferred that resolves if there were
 391         // updated partners, and fails if not
 392         load_new_partners: function(){
 393             var self = this;
 394             var def  = new $.Deferred();
 395             var fields = _.find(this.models,function(model){ return model.model === 'res.partner'; }).fields;
 396             new instance.web.Model('res.partner')
 397                 .query(fields)
 398                 .filter([['write_date','>',this.db.get_partner_write_date()]])
 399                 .all({'timeout':3000, 'shadow': true})
 400                 .then(function(partners){
 401                     if (self.db.add_partners(partners)) {   // check if the partners we got were real updates
 402                         def.resolve();
 403                     } else {
 404                         def.reject();
 405                     }
 406                 }, function(){ def.reject(); });
 407             return def;
 408         },
 409
 410         // this is called when an order is removed from the order collection. It ensures that there is always an existing
 411         // order and a valid selected order
 412         on_removed_order: function(removed_order,index,reason){
 413             if( (reason === 'abandon' || removed_order.temporary) && this.get('orders').size() > 0){
 414                 // when we intentionally remove an unfinished order, and there is another existing one
 415                 this.set({'selectedOrder' : this.get('orders').at(index) || this.get('orders').last()});
 416             }else{
 417                 // when the order was automatically removed after completion,
 418                 // or when we intentionally delete the only concurrent order
 419                 this.add_new_order();
 420             }
 421         },
 422
 423         //creates a new empty order and sets it as the current order
 424         add_new_order: function(){
 425             var order = new module.Order({pos:this});
 426             this.get('orders').add(order);
 427             this.set('selectedOrder', order);
 428         },
 429
 430         get_order: function(){
 431             return this.get('selectedOrder');
 432         },
 433
 434         //removes the current order
 435         delete_current_order: function(){
 436             this.get('selectedOrder').destroy({'reason':'abandon'});
 437         },
 438
 439         // saves the order locally and try to send it to the backend.
 440         // it returns a deferred that succeeds after having tried to send the order and all the other pending orders.
 441         push_order: function(order) {
 442             var self = this;
 443
 444             if(order){
 445                 this.proxy.log('push_order',order.export_as_JSON());
 446                 this.db.add_order(order.export_as_JSON());
 447             }
 448
 449             var pushed = new $.Deferred();
 450
 451             this.flush_mutex.exec(function(){
 452                 var flushed = self._flush_orders(self.db.get_orders());
 453
 454                 flushed.always(function(ids){
 455                     pushed.resolve();
 456                 });
 457             });
 458             return pushed;
 459         },
 460
 461         // saves the order locally and try to send it to the backend and make an invoice
 462         // returns a deferred that succeeds when the order has been posted and successfully generated
 463         // an invoice. This method can fail in various ways:
 464         // error-no-client: the order must have an associated partner_id. You can retry to make an invoice once
 465         //     this error is solved
 466         // error-transfer: there was a connection error during the transfer. You can retry to make the invoice once
 467         //     the network connection is up
 468
 469         push_and_invoice_order: function(order){
 470             var self = this;
 471             var invoiced = new $.Deferred();
 472
 473             if(!order.get_client()){
 474                 invoiced.reject('error-no-client');
 475                 return invoiced;
 476             }
 477
 478             var order_id = this.db.add_order(order.export_as_JSON());
 479
 480             this.flush_mutex.exec(function(){
 481                 var done = new $.Deferred(); // holds the mutex
 482
 483                 // send the order to the server
 484                 // we have a 30 seconds timeout on this push.
 485                 // FIXME: if the server takes more than 30 seconds to accept the order,
 486                 // the client will believe it wasn't successfully sent, and very bad
 487                 // things will happen as a duplicate will be sent next time
 488                 // so we must make sure the server detects and ignores duplicated orders
 489
 490                 var transfer = self._flush_orders([self.db.get_order(order_id)], {timeout:30000, to_invoice:true});
 491
 492                 transfer.fail(function(){
 493                     invoiced.reject('error-transfer');
 494                     done.reject();
 495                 });
 496
 497                 // on success, get the order id generated by the server
 498                 transfer.pipe(function(order_server_id){
 499
 500                     // generate the pdf and download it
 501                     self.pos_widget.do_action('point_of_sale.pos_invoice_report',{additional_context:{
 502                         active_ids:order_server_id,
 503                     }});
 504
 505                     invoiced.resolve();
 506                     done.resolve();
 507                 });
 508
 509                 return done;
 510
 511             });
 512
 513             return invoiced;
 514         },
 515
 516         // wrapper around the _save_to_server that updates the synch status widget
 517         _flush_orders: function(orders, options) {
 518             var self = this;
 519             this.set('synch',{ state: 'connecting', pending: orders.length});
 520
 521             return self._save_to_server(orders, options).done(function (server_ids) {
 522                 var pending = self.db.get_orders().length;
 523
 524                 self.set('synch', {
 525                     state: pending ? 'connecting' : 'connected',
 526                     pending: pending
 527                 });
 528
 529                 return server_ids;
 530             });
 531         },
 532
 533         // send an array of orders to the server
 534         // available options:
 535         // - timeout: timeout for the rpc call in ms
 536         // returns a deferred that resolves with the list of
 537         // server generated ids for the sent orders
 538         _save_to_server: function (orders, options) {
 539             if (!orders || !orders.length) {
 540                 var result = $.Deferred();
 541                 result.resolve([]);
 542                 return result;
 543             }
 544
 545             options = options || {};
 546
 547             var self = this;
 548             var timeout = typeof options.timeout === 'number' ? options.timeout : 7500 * orders.length;
 549
 550             // we try to send the order. shadow prevents a spinner if it takes too long. (unless we are sending an invoice,
 551             // then we want to notify the user that we are waiting on something )
 552             var posOrderModel = new instance.web.Model('pos.order');
 553             return posOrderModel.call('create_from_ui',
 554                 [_.map(orders, function (order) {
 555                     order.to_invoice = options.to_invoice || false;
 556                     return order;
 557                 })],
 558                 undefined,
 559                 {
 560                     shadow: !options.to_invoice,
 561                     timeout: timeout
 562                 }
 563             ).then(function (server_ids) {
 564                 _.each(orders, function (order) {
 565                     self.db.remove_order(order.id);
 566                 });
 567                 return server_ids;
 568             }).fail(function (error, event){
 569                 if(error.code === 200 ){    // Business Logic Error, not a connection problem
 570                     self.pos_widget.screen_selector.show_popup('error-traceback',{
 571                         message: error.data.message,
 572                         comment: error.data.debug
 573                     });
 574                 }
 575                 // prevent an error popup creation by the rpc failure
 576                 // we want the failure to be silent as we send the orders in the background
 577                 event.preventDefault();
 578                 console.error('Failed to send orders:', orders);
 579             });
 580         },
 581
 582         scan_product: function(parsed_code){
 583             var self = this;
 584             var selectedOrder = this.get('selectedOrder');
 585             if(parsed_code.encoding === 'ean13'){
 586                 var product = this.db.get_product_by_ean13(parsed_code.base_code);
 587             }else if(parsed_code.encoding === 'reference'){
 588                 var product = this.db.get_product_by_reference(parsed_code.code);
 589             }
 590
 591             if(!product){
 592                 return false;
 593             }
 594
 595             if(parsed_code.type === 'price'){
 596                 selectedOrder.addProduct(product, {price:parsed_code.value});
 597             }else if(parsed_code.type === 'weight'){
 598                 selectedOrder.addProduct(product, {quantity:parsed_code.value, merge:false});
 599             }else if(parsed_code.type === 'discount'){
 600                 selectedOrder.addProduct(product, {discount:parsed_code.value, merge:false});
 601             }else{
 602                 selectedOrder.addProduct(product);
 603             }
 604             return true;
 605         },
 606     });
 607
 608     var orderline_id = 1;
 609
 610     // An orderline represent one element of the content of a client's shopping cart.
 611     // An orderline contains a product, its quantity, its price, discount. etc.
 612     // An Order contains zero or more Orderlines.
 613     module.Orderline = Backbone.Model.extend({
 614         initialize: function(attr,options){
 615             this.pos = options.pos;
 616             this.order = options.order;
 617             this.product = options.product;
 618             this.price   = options.product.price;
 619             this.quantity = 1;
 620             this.quantityStr = '1';
 621             this.discount = 0;
 622             this.discountStr = '0';
 623             this.type = 'unit';
 624             this.selected = false;
 625             this.id       = orderline_id++;
 626         },
 627         clone: function(){
 628             var orderline = new module.Orderline({},{
 629                 pos: this.pos,
 630                 order: null,
 631                 product: this.product,
 632                 price: this.price,
 633             });
 634             orderline.quantity = this.quantity;
 635             orderline.quantityStr = this.quantityStr;
 636             orderline.discount = this.discount;
 637             orderline.type = this.type;
 638             orderline.selected = false;
 639             return orderline;
 640         },
 641         // sets a discount [0,100]%
 642         set_discount: function(discount){
 643             var disc = Math.min(Math.max(parseFloat(discount) || 0, 0),100);
 644             this.discount = disc;
 645             this.discountStr = '' + disc;
 646             this.trigger('change',this);
 647         },
 648         // returns the discount [0,100]%
 649         get_discount: function(){
 650             return this.discount;
 651         },
 652         get_discount_str: function(){
 653             return this.discountStr;
 654         },
 655         get_product_type: function(){
 656             return this.type;
 657         },
 658         // sets the quantity of the product. The quantity will be rounded according to the
 659         // product's unity of measure properties. Quantities greater than zero will not get
 660         // rounded to zero
 661         set_quantity: function(quantity){
 662             if(quantity === 'remove'){
 663                 this.order.removeOrderline(this);
 664                 return;
 665             }else{
 666                 var quant = parseFloat(quantity) || 0;
 667                 var unit = this.get_unit();
 668                 if(unit){
 669                     this.quantity    = round_pr(quant, unit.rounding);
 670                     this.quantityStr = this.quantity.toFixed(Math.ceil(Math.log(1.0 / unit.rounding) / Math.log(10)));
 671                 }else{
 672                     this.quantity    = quant;
 673                     this.quantityStr = '' + this.quantity;
 674                 }
 675             }
 676             this.trigger('change',this);
 677         },
 678         // return the quantity of product
 679         get_quantity: function(){
 680             return this.quantity;
 681         },
 682         get_quantity_str: function(){
 683             return this.quantityStr;
 684         },
 685         get_quantity_str_with_unit: function(){
 686             var unit = this.get_unit();
 687             if(unit && !unit.is_unit){
 688                 return this.quantityStr + ' ' + unit.name;
 689             }else{
 690                 return this.quantityStr;
 691             }
 692         },
 693         // return the unit of measure of the product
 694         get_unit: function(){
 695             var unit_id = (this.product.uos_id || this.product.uom_id);
 696             if(!unit_id){
 697                 return undefined;
 698             }
 699             unit_id = unit_id[0];
 700             if(!this.pos){
 701                 return undefined;
 702             }
 703             return this.pos.units_by_id[unit_id];
 704         },
 705         // return the product of this orderline
 706         get_product: function(){
 707             return this.product;
 708         },
 709         // selects or deselects this orderline
 710         set_selected: function(selected){
 711             this.selected = selected;
 712             this.trigger('change',this);
 713         },
 714         // returns true if this orderline is selected
 715         is_selected: function(){
 716             return this.selected;
 717         },
 718         // when we add an new orderline we want to merge it with the last line to see reduce the number of items
 719         // in the orderline. This returns true if it makes sense to merge the two
 720         can_be_merged_with: function(orderline){
 721             if( this.get_product().id !== orderline.get_product().id){    //only orderline of the same product can be merged
 722                 return false;
 723             }else if(!this.get_unit() || !this.get_unit().groupable){
 724                 return false;
 725             }else if(this.get_product_type() !== orderline.get_product_type()){
 726                 return false;
 727             }else if(this.get_discount() > 0){             // we don't merge discounted orderlines
 728                 return false;
 729             }else if(this.price !== orderline.price){
 730                 return false;
 731             }else{
 732                 return true;
 733             }
 734         },
 735         merge: function(orderline){
 736             this.set_quantity(this.get_quantity() + orderline.get_quantity());
 737         },
 738         export_as_JSON: function() {
 739             return {
 740                 qty: this.get_quantity(),
 741                 price_unit: this.get_unit_price(),
 742                 discount: this.get_discount(),
 743                 product_id: this.get_product().id,
 744             };
 745         },
 746         //used to create a json of the ticket, to be sent to the printer
 747         export_for_printing: function(){
 748             return {
 749                 quantity:           this.get_quantity(),
 750                 unit_name:          this.get_unit().name,
 751                 price:              this.get_unit_price(),
 752                 discount:           this.get_discount(),
 753                 product_name:       this.get_product().display_name,
 754                 price_display :     this.get_display_price(),
 755                 price_with_tax :    this.get_price_with_tax(),
 756                 price_without_tax:  this.get_price_without_tax(),
 757                 tax:                this.get_tax(),
 758                 product_description:      this.get_product().description,
 759                 product_description_sale: this.get_product().description_sale,
 760             };
 761         },
 762         // changes the base price of the product for this orderline
 763         set_unit_price: function(price){
 764             this.price = round_di(parseFloat(price) || 0, 2);
 765             this.trigger('change',this);
 766         },
 767         get_unit_price: function(){
 768             var rounding = this.pos.currency.rounding;
 769             return round_pr(this.price,rounding);
 770         },
 771         get_display_price: function(){
 772             var rounding = this.pos.currency.rounding;
 773             return  round_pr(round_pr(this.get_unit_price() * this.get_quantity(),rounding) * (1- this.get_discount()/100.0),rounding);
 774         },
 775         get_price_without_tax: function(){
 776             return this.get_all_prices().priceWithoutTax;
 777         },
 778         get_price_with_tax: function(){
 779             return this.get_all_prices().priceWithTax;
 780         },
 781         get_tax: function(){
 782             return this.get_all_prices().tax;
 783         },
 784         get_tax_details: function(){
 785             return this.get_all_prices().taxDetails;
 786         },
 787         get_all_prices: function(){
 788             var self = this;
 789             var currency_rounding = this.pos.currency.rounding;
 790             var base = round_pr(this.get_quantity() * this.get_unit_price() * (1.0 - (this.get_discount() / 100.0)), currency_rounding);
 791             var totalTax = base;
 792             var totalNoTax = base;
 793
 794             var product =  this.get_product();
 795             var taxes_ids = product.taxes_id;
 796             var taxes =  self.pos.taxes;
 797             var taxtotal = 0;
 798             var taxdetail = {};
 799             _.each(taxes_ids, function(el) {
 800                 var tax = _.detect(taxes, function(t) {return t.id === el;});
 801                 if (tax.price_include) {
 802                     var tmp;
 803                     if (tax.type === "percent") {
 804                         tmp =  base - round_pr(base / (1 + tax.amount),currency_rounding);
 805                     } else if (tax.type === "fixed") {
 806                         tmp = round_pr(tax.amount * self.get_quantity(),currency_rounding);
 807                     } else {
 808                         throw "This type of tax is not supported by the point of sale: " + tax.type;
 809                     }
 810                     tmp = round_pr(tmp,currency_rounding);
 811                     taxtotal += tmp;
 812                     totalNoTax -= tmp;
 813                     taxdetail[tax.id] = tmp;
 814                 } else {
 815                     var tmp;
 816                     if (tax.type === "percent") {
 817                         tmp = tax.amount * base;
 818                     } else if (tax.type === "fixed") {
 819                         tmp = tax.amount * self.get_quantity();
 820                     } else {
 821                         throw "This type of tax is not supported by the point of sale: " + tax.type;
 822                     }
 823                     tmp = round_pr(tmp,currency_rounding);
 824                     taxtotal += tmp;
 825                     totalTax += tmp;
 826                     taxdetail[tax.id] = tmp;
 827                 }
 828             });
 829             return {
 830                 "priceWithTax": totalTax,
 831                 "priceWithoutTax": totalNoTax,
 832                 "tax": taxtotal,
 833                 "taxDetails": taxdetail,
 834             };
 835         },
 836     });
 837
 838     module.OrderlineCollection = Backbone.Collection.extend({
 839         model: module.Orderline,
 840     });
 841
 842     // Every Paymentline contains a cashregister and an amount of money.
 843     module.Paymentline = Backbone.Model.extend({
 844         initialize: function(attributes, options) {
 845             this.amount = 0;
 846             this.cashregister = options.cashregister;
 847             this.name = this.cashregister.journal_id[1];
 848             this.selected = false;
 849         },
 850         //sets the amount of money on this payment line
 851         set_amount: function(value){
 852             this.amount = round_di(parseFloat(value) || 0, 2);
 853             this.trigger('change:amount',this);
 854         },
 855         // returns the amount of money on this paymentline
 856         get_amount: function(){
 857             return this.amount;
 858         },
 859         set_selected: function(selected){
 860             if(this.selected !== selected){
 861                 this.selected = selected;
 862                 this.trigger('change:selected',this);
 863             }
 864         },
 865         // returns the associated cashregister
 866         //exports as JSON for server communication
 867         export_as_JSON: function(){
 868             return {
 869                 name: instance.web.datetime_to_str(new Date()),
 870                 statement_id: this.cashregister.id,
 871                 account_id: this.cashregister.account_id[0],
 872                 journal_id: this.cashregister.journal_id[0],
 873                 amount: this.get_amount()
 874             };
 875         },
 876         //exports as JSON for receipt printing
 877         export_for_printing: function(){
 878             return {
 879                 amount: this.get_amount(),
 880                 journal: this.cashregister.journal_id[1],
 881             };
 882         },
 883     });
 884
 885     module.PaymentlineCollection = Backbone.Collection.extend({
 886         model: module.Paymentline,
 887     });
 888
 889
 890     // An order more or less represents the content of a client's shopping cart (the OrderLines)
 891     // plus the associated payment information (the Paymentlines)
 892     // there is always an active ('selected') order in the Pos, a new one is created
 893     // automaticaly once an order is completed and sent to the server.
 894     module.Order = Backbone.Model.extend({
 895         initialize: function(attributes){
 896             Backbone.Model.prototype.initialize.apply(this, arguments);
 897             this.pos = attributes.pos;
 898             this.sequence_number = this.pos.pos_session.sequence_number++;
 899             this.uid =     this.generateUniqueId();
 900             this.set({
 901                 creationDate:   new Date(),
 902                 orderLines:     new module.OrderlineCollection(),
 903                 paymentLines:   new module.PaymentlineCollection(),
 904                 name:           _t("Order ") + this.uid,
 905                 client:         null,
 906             });
 907             this.selected_orderline   = undefined;
 908             this.selected_paymentline = undefined;
 909             this.screen_data = {};  // see ScreenSelector
 910             this.receipt_type = 'receipt';  // 'receipt' || 'invoice'
 911             this.temporary = attributes.temporary || false;
 912             this.to_invoice = false;
 913             return this;
 914         },
 915         is_empty: function(){
 916             return (this.get('orderLines').models.length === 0);
 917         },
 918         // Generates a public identification number for the order.
 919         // The generated number must be unique and sequential. They are made 12 digit long
 920         // to fit into EAN-13 barcodes, should it be needed
 921         generateUniqueId: function() {
 922             function zero_pad(num,size){
 923                 var s = ""+num;
 924                 while (s.length < size) {
 925                     s = "0" + s;
 926                 }
 927                 return s;
 928             }
 929             return zero_pad(this.pos.pos_session.id,5) +'-'+
 930                    zero_pad(this.pos.pos_session.login_number,3) +'-'+
 931                    zero_pad(this.sequence_number,4);
 932         },
 933         addOrderline: function(line){
 934             if(line.order){
 935                 order.removeOrderline(line);
 936             }
 937             line.order = this;
 938             this.get('orderLines').add(line);
 939             this.selectLine(this.getLastOrderline());
 940         },
 941         addProduct: function(product, options){
 942             options = options || {};
 943             var attr = JSON.parse(JSON.stringify(product));
 944             attr.pos = this.pos;
 945             attr.order = this;
 946             var line = new module.Orderline({}, {pos: this.pos, order: this, product: product});
 947
 948             if(options.quantity !== undefined){
 949                 line.set_quantity(options.quantity);
 950             }
 951             if(options.price !== undefined){
 952                 line.set_unit_price(options.price);
 953             }
 954             if(options.discount !== undefined){
 955                 line.set_discount(options.discount);
 956             }
 957
 958             var last_orderline = this.getLastOrderline();
 959             if( last_orderline && last_orderline.can_be_merged_with(line) && options.merge !== false){
 960                 last_orderline.merge(line);
 961             }else{
 962                 this.get('orderLines').add(line);
 963             }
 964             this.selectLine(this.getLastOrderline());
 965         },
 966         removeOrderline: function( line ){
 967             this.get('orderLines').remove(line);
 968             this.selectLine(this.getLastOrderline());
 969         },
 970         getOrderline: function(id){
 971             var orderlines = this.get('orderLines').models;
 972             for(var i = 0; i < orderlines.length; i++){
 973                 if(orderlines[i].id === id){
 974                     return orderlines[i];
 975                 }
 976             }
 977             return null;
 978         },
 979         getLastOrderline: function(){
 980             return this.get('orderLines').at(this.get('orderLines').length -1);
 981         },
 982         addPaymentline: function(cashregister) {
 983             var paymentLines = this.get('paymentLines');
 984             var newPaymentline = new module.Paymentline({},{cashregister:cashregister});
 985             if(cashregister.journal.type !== 'cash'){
 986                 newPaymentline.set_amount( Math.max(this.getDueLeft(),0) );
 987             }
 988             paymentLines.add(newPaymentline);
 989             this.selectPaymentline(newPaymentline);
 990
 991         },
 992         removePaymentline: function(line){
 993             if(this.selected_paymentline === line){
 994                 this.selectPaymentline(undefined);
 995             }
 996             this.get('paymentLines').remove(line);
 997         },
 998         getName: function() {
 999             return this.get('name');
1000         },
1001         getSubtotal : function(){
1002             return (this.get('orderLines')).reduce((function(sum, orderLine){
1003                 return sum + orderLine.get_display_price();
1004             }), 0);
1005         },
1006         getTotalTaxIncluded: function() {
1007             return (this.get('orderLines')).reduce((function(sum, orderLine) {
1008                 return sum + orderLine.get_price_with_tax();
1009             }), 0);
1010         },
1011         getDiscountTotal: function() {
1012             return (this.get('orderLines')).reduce((function(sum, orderLine) {
1013                 return sum + (orderLine.get_unit_price() * (orderLine.get_discount()/100) * orderLine.get_quantity());
1014             }), 0);
1015         },
1016         getTotalTaxExcluded: function() {
1017             return (this.get('orderLines')).reduce((function(sum, orderLine) {
1018                 return sum + orderLine.get_price_without_tax();
1019             }), 0);
1020         },
1021         getTax: function() {
1022             return (this.get('orderLines')).reduce((function(sum, orderLine) {
1023                 return sum + orderLine.get_tax();
1024             }), 0);
1025         },
1026         getTaxDetails: function(){
1027             var details = {};
1028             var fulldetails = [];
1029             var taxes_by_id = {};
1030
1031             for(var i = 0; i < this.pos.taxes.length; i++){
1032                 taxes_by_id[this.pos.taxes[i].id] = this.pos.taxes[i];
1033             }
1034
1035             this.get('orderLines').each(function(line){
1036                 var ldetails = line.get_tax_details();
1037                 for(var id in ldetails){
1038                     if(ldetails.hasOwnProperty(id)){
1039                         details[id] = (details[id] || 0) + ldetails[id];
1040                     }
1041                 }
1042             });
1043
1044             for(var id in details){
1045                 if(details.hasOwnProperty(id)){
1046                     fulldetails.push({amount: details[id], tax: taxes_by_id[id]});
1047                 }
1048             }
1049
1050             return fulldetails;
1051         },
1052         getPaidTotal: function() {
1053             return (this.get('paymentLines')).reduce((function(sum, paymentLine) {
1054                 return sum + paymentLine.get_amount();
1055             }), 0);
1056         },
1057         getChange: function(paymentline) {
1058             if (!paymentline) {
1059                 var change = this.getPaidTotal() - this.getTotalTaxIncluded();
1060             } else {
1061                 var change = -this.getTotalTaxIncluded();
1062                 var lines  = this.get('paymentLines').models;
1063                 for (var i = 0; i < lines.length; i++) {
1064                     change += lines[i].get_amount();
1065                     if (lines[i] === paymentline) {
1066                         break;
1067                     }
1068                 }
1069             }
1070             return round_pr(Math.max(0,change), this.pos.currency.rounding);
1071         },
1072         getDueLeft: function(paymentline) {
1073             if (!paymentline) {
1074                 var due = this.getTotalTaxIncluded() - this.getPaidTotal();
1075             } else {
1076                 var due = this.getTotalTaxIncluded();
1077                 var lines = this.get('paymentLines').models;
1078                 for (var i = 0; i < lines.length; i++) {
1079                     if (lines[i] === paymentline) {
1080                         break;
1081                     } else {
1082                         due -= lines[i].get_amount();
1083                     }
1084                 }
1085             }
1086             return round_pr(Math.max(0,due), this.pos.currency.rounding);
1087         },
1088         isPaid: function(){
1089             return this.getDueLeft() === 0;
1090         },
1091         isPaidWithCash: function(){
1092             return !!this.get('paymentLines').find( function(pl){
1093                 return pl.cashregister.journal.type === 'cash';
1094             });
1095         },
1096         finalize: function(){
1097             this.destroy();
1098         },
1099         // sets the type of receipt 'receipt'(default) or 'invoice'
1100         set_receipt_type: function(type){
1101             this.receipt_type = type;
1102         },
1103         get_receipt_type: function(){
1104             return this.receipt_type;
1105         },
1106         // the client related to the current order.
1107         set_client: function(client){
1108             this.set('client',client);
1109         },
1110         get_client: function(){
1111             return this.get('client');
1112         },
1113         get_client_name: function(){
1114             var client = this.get('client');
1115             return client ? client.name : "";
1116         },
1117         // the order also stores the screen status, as the PoS supports
1118         // different active screens per order. This method is used to
1119         // store the screen status.
1120         set_screen_data: function(key,value){
1121             if(arguments.length === 2){
1122                 this.screen_data[key] = value;
1123             }else if(arguments.length === 1){
1124                 for(key in arguments[0]){
1125                     this.screen_data[key] = arguments[0][key];
1126                 }
1127             }
1128         },
1129         set_to_invoice: function(to_invoice) {
1130             this.to_invoice = to_invoice;
1131         },
1132         is_to_invoice: function(){
1133             return this.to_invoice;
1134         },
1135         // remove all the paymentlines with zero money in it
1136         clean_empty_paymentlines: function() {
1137             var lines = this.get('paymentLines').models;
1138             var empty = [];
1139             for ( var i = 0; i < lines.length; i++) {
1140                 if (!lines[i].get_amount()) {
1141                     empty.push(lines[i]);
1142                 }
1143             }
1144             for ( var i = 0; i < empty.length; i++) {
1145                 this.removePaymentline(empty[i]);
1146             }
1147         },
1148         //see set_screen_data
1149         get_screen_data: function(key){
1150             return this.screen_data[key];
1151         },
1152         // exports a JSON for receipt printing
1153         export_for_printing: function(){
1154             var orderlines = [];
1155             this.get('orderLines').each(function(orderline){
1156                 orderlines.push(orderline.export_for_printing());
1157             });
1158
1159             var paymentlines = [];
1160             this.get('paymentLines').each(function(paymentline){
1161                 paymentlines.push(paymentline.export_for_printing());
1162             });
1163             var client  = this.get('client');
1164             var cashier = this.pos.cashier || this.pos.user;
1165             var company = this.pos.company;
1166             var shop    = this.pos.shop;
1167             var date = new Date();
1168
1169             return {
1170                 orderlines: orderlines,
1171                 paymentlines: paymentlines,
1172                 subtotal: this.getSubtotal(),
1173                 total_with_tax: this.getTotalTaxIncluded(),
1174                 total_without_tax: this.getTotalTaxExcluded(),
1175                 total_tax: this.getTax(),
1176                 total_paid: this.getPaidTotal(),
1177                 total_discount: this.getDiscountTotal(),
1178                 tax_details: this.getTaxDetails(),
1179                 change: this.getChange(),
1180                 name : this.getName(),
1181                 client: client ? client.name : null ,
1182                 invoice_id: null,   //TODO
1183                 cashier: cashier ? cashier.name : null,
1184                 header: this.pos.config.receipt_header || '',
1185                 footer: this.pos.config.receipt_footer || '',
1186                 precision: {
1187                     price: 2,
1188                     money: 2,
1189                     quantity: 3,
1190                 },
1191                 date: {
1192                     year: date.getFullYear(),
1193                     month: date.getMonth(),
1194                     date: date.getDate(),       // day of the month
1195                     day: date.getDay(),         // day of the week
1196                     hour: date.getHours(),
1197                     minute: date.getMinutes() ,
1198                     isostring: date.toISOString(),
1199                     localestring: date.toLocaleString(),
1200                 },
1201                 company:{
1202                     email: company.email,
1203                     website: company.website,
1204                     company_registry: company.company_registry,
1205                     contact_address: company.partner_id[1],
1206                     vat: company.vat,
1207                     name: company.name,
1208                     phone: company.phone,
1209                     logo:  this.pos.company_logo_base64,
1210                 },
1211                 shop:{
1212                     name: shop.name,
1213                 },
1214                 currency: this.pos.currency,
1215             };
1216         },
1217         export_as_JSON: function() {
1218             var orderLines, paymentLines;
1219             orderLines = [];
1220             (this.get('orderLines')).each(_.bind( function(item) {
1221                 return orderLines.push([0, 0, item.export_as_JSON()]);
1222             }, this));
1223             paymentLines = [];
1224             (this.get('paymentLines')).each(_.bind( function(item) {
1225                 return paymentLines.push([0, 0, item.export_as_JSON()]);
1226             }, this));
1227             return {
1228                 name: this.getName(),
1229                 amount_paid: this.getPaidTotal(),
1230                 amount_total: this.getTotalTaxIncluded(),
1231                 amount_tax: this.getTax(),
1232                 amount_return: this.getChange(),
1233                 lines: orderLines,
1234                 statement_ids: paymentLines,
1235                 pos_session_id: this.pos.pos_session.id,
1236                 partner_id: this.get_client() ? this.get_client().id : false,
1237                 user_id: this.pos.cashier ? this.pos.cashier.id : this.pos.user.id,
1238                 uid: this.uid,
1239                 sequence_number: this.sequence_number,
1240             };
1241         },
1242         getSelectedLine: function(){
1243             return this.selected_orderline;
1244         },
1245         selectLine: function(line){
1246             if(line){
1247                 if(line !== this.selected_orderline){
1248                     if(this.selected_orderline){
1249                         this.selected_orderline.set_selected(false);
1250                     }
1251                     this.selected_orderline = line;
1252                     this.selected_orderline.set_selected(true);
1253                 }
1254             }else{
1255                 this.selected_orderline = undefined;
1256             }
1257         },
1258         deselectLine: function(){
1259             if(this.selected_orderline){
1260                 this.selected_orderline.set_selected(false);
1261                 this.selected_orderline = undefined;
1262             }
1263         },
1264         selectPaymentline: function(line){
1265             if(line !== this.selected_paymentline){
1266                 if(this.selected_paymentline){
1267                     this.selected_paymentline.set_selected(false);
1268                 }
1269                 this.selected_paymentline = line;
1270                 if(this.selected_paymentline){
1271                     this.selected_paymentline.set_selected(true);
1272                 }
1273                 this.trigger('change:selected_paymentline',this.selected_paymentline);
1274             }
1275         },
1276     });
1277
1278     module.OrderCollection = Backbone.Collection.extend({
1279         model: module.Order,
1280     });
1281
1282     /*
1283      The numpad handles both the choice of the property currently being modified
1284      (quantity, price or discount) and the edition of the corresponding numeric value.
1285      */
1286     module.NumpadState = Backbone.Model.extend({
1287         defaults: {
1288             buffer: "0",
1289             mode: "quantity"
1290         },
1291         appendNewChar: function(newChar) {
1292             var oldBuffer;
1293             oldBuffer = this.get('buffer');
1294             if (oldBuffer === '0') {
1295                 this.set({
1296                     buffer: newChar
1297                 });
1298             } else if (oldBuffer === '-0') {
1299                 this.set({
1300                     buffer: "-" + newChar
1301                 });
1302             } else {
1303                 this.set({
1304                     buffer: (this.get('buffer')) + newChar
1305                 });
1306             }
1307             this.trigger('set_value',this.get('buffer'));
1308         },
1309         deleteLastChar: function() {
1310             if(this.get('buffer') === ""){
1311                 if(this.get('mode') === 'quantity'){
1312                     this.trigger('set_value','remove');
1313                 }else{
1314                     this.trigger('set_value',this.get('buffer'));
1315                 }
1316             }else{
1317                 var newBuffer = this.get('buffer').slice(0,-1) || "";
1318                 this.set({ buffer: newBuffer });
1319                 this.trigger('set_value',this.get('buffer'));
1320             }
1321         },
1322         switchSign: function() {
1323             var oldBuffer;
1324             oldBuffer = this.get('buffer');
1325             this.set({
1326                 buffer: oldBuffer[0] === '-' ? oldBuffer.substr(1) : "-" + oldBuffer
1327             });
1328             this.trigger('set_value',this.get('buffer'));
1329         },
1330         changeMode: function(newMode) {
1331             this.set({
1332                 buffer: "0",
1333                 mode: newMode
1334             });
1335         },
1336         reset: function() {
1337             this.set({
1338                 buffer: "0",
1339                 mode: "quantity"
1340             });
1341         },
1342         resetValue: function(){
1343             this.set({buffer:'0'});
1344         },
1345     });
1346 }