javascript - How to pass a parameter to Collection parse? backbone.js -

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how 1 pass parameter through parse/fetch function? want pass variable variable_parameter in lower initialize-part.

otherwise have write 3 identical collections.

thank you help.

app.js

//-------------- // collections //--------------      diagnoseapp.collections.param1_items = backbone.collection.extend({         model: diagnoseapp.models.param1_item,         url: 'testinterface.xml',         parse: function (data) {              var parsed = [];              $(data).find(/*variable_parameter*/).find('parameter').each(function (index) {                 var v_number = $(this).attr('number');                 var v_desc_d = $(this).attr('desc_d');                 parsed.push({ data_type: v_data_type, number: v_number, desc_d: v_desc_d});             });              return parsed;         },          fetch: function (options) {              options = options || {};             options.datatype = "xml";             return backbone.collection.prototype.fetch.call(this, options);         }     });

this way initialize app:

    //--------------     // initialize     //--------------      var variable_parameter = "offline";      var offline_collection = new diagnoseapp.collections.param1_items();     var offline_collection_view = new diagnoseapp.views.param1_items({collection: offline_collection});       //variable_parameter has passed here in fetch guess ??       offline_collection.fetch({         success: function() {               console.log("json file load successful", offline_collection);                offline_collection_view.render();           },         error: function(){            console.log('there error in loading , processing json file');         }      });

the fetch method accepts option argument : http://backbonejs.org/#collection-fetch parse method accepts option argument: http://backbonejs.org/#collection-parse these objects same. may write:

parse: function (data, options) {          var parsed = [];          $(data).find(options.variableparameter).find('parameter').each(function (index) {             var v_number = $(this).attr('number');             var v_desc_d = $(this).attr('desc_d');             parsed.push({ data_type: v_data_type, number: v_number, desc_d: v_desc_d});         });          return parsed;     },

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