Question

I am using a test .json file and can console.log the url fine in the success, but I am trying to now append parameters to the url and they are being ignored.

This is what the view looks like, works fine and success message appears with a test json file:

busImportSearch: function() {
    importSelect.fetch({
        data: {
            importPhone: '5555555555',
            busImportName: 'test business',
            busImportCID: '12345',
            busImportBID: '1234567890'
        },
        success: function(results) {
            // url console.log's fine just no params
        }
    });
}

This is what I have in the collection:

var importSelect = Backbone.Collection.extend({
    model: importModel,

    url:'somepath/test.json',

    sync: function(method, model, options) {
        options.timeout = 10000;
    options.dataType = "json";
        return Backbone.sync(method, model, options);
    },

    parse: function(response) {
        console.log(this.url);
        if (typeof response.data !== 'undefined') {
            this.result = response.data.list;
         }
        return this.result;
     },
});

 return new importSelect;
});

Edit

I think this is working but I think there is a better way to do this:

url: function() {
  var busimportPhone = $("#busImportPhone").val();
  var busImportName = $("#busImportName").val();
  var busImportCID = $("#busImportCID").val();
  var busImportBID = $("#busImportBID").val(); 
  var updateUrl = 'test.json' + '?importPhone=' + busimportPhone + '&importName=' + busImportName + '&importCID=' + busImportCID + '&importBID' + busImportBID; return updateUrl;
},

Answer 1

This is not a whole lot better, but you could store the list of properties on the collection some where and create the url from there. Eg.

importSelect.myDataList = {
        importPhone: '5555555555',
        busImportName: 'test business',
        busImportCID: '12345',
        busImportBID: '1234567890'
    };
importSelect.fetch({ ... });

And construct your url using a function something like (code not tested)

function constructUrl(data) {
    var result = "";
    var count = 0;
    for(var i in data) {
       var prefix = "&";
       if(count == 0) {
           prefix = "?";
       }
       result += prefix + i + "=" + data[i];
    }
    return result;
}

and use function to create Url

...
url: function() { 
    return constructUrl(this.data);
}

hope that helps.