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POBackbone: (Callback) function even not binding to Collection
 

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  1. POBackbone: (Callback) function even not binding to Collection
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    <p>I want updatePlays function to be called as a callback function when an AJAX call is successful. I thought that using underscore bind would let me refer 'this' as the Collection object that I actually want to update, but I'm having trouble here. When I get to the function that should update collection, it thinks that 'this' refers to 'window'. </p> <p>In this situation, a Backbone Model has Backbone Collection, which are made from another backbone models. </p> <p>in view: </p> <pre><code>SomeView: Backbone.View.extend({ someFunction: function(e) { var field = this this.picker = new PlayPicker({ field:field, model: new PlaySet({ plays: new Collections.Plays({}), slot: field.model }) }) } }) PlayPicker:Backbone.View.extend({ ... refresh: function () { this.model.update() }, .... </code></pre> <p>Collection that's part of model PlaySet</p> <pre><code>Plays:Backbone.Collection.extend({ model: Play , initialize: function () { plays = this _.bind(this.updatePlays, plays) // Where I thought I should bind }, updatePlays: function (plays) { new_plays = [] var i; for (i = 0; i &lt; plays.length; i++){ new_plays.push(new Play({ id: plays[i]["id"], text: plays[i]["text"] })); } this.reset(new_plays) // Uncaught TypeError: Object [object Window] has no method 'reset' } }) </code></pre> <p>Model PlaySet</p> <pre><code>PlaySet: Backbone.Model.extend({ update: function() { this.get('slot').fetchAssociatedPlays(this.get('plays').updatePlays) }, }) </code></pre> <p>Model Slot - does the AJAX call</p> <pre><code>Slot:Backbone.Model.extend({ ... fetchAssociatedPlays: function(update) { thisModel = this $.ajax({ url: thisModel.associatedPlaysURL(), success: function (collection) { update(collection) } }) }}) </code></pre> <p>Should this be achievable with underscore bind, and where/how would be the correct way? </p> <p>Thank you in advance.</p>
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    1. USJi Mun
    1. USJi Mun
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    1. CONot sure if it is causing your problem, but declaring 'plays' without specifying 'var' before it is going to make the scope of 'plays' global I think which could cause problems, likewise with other variables you are missing the 'var'
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      1. USDarren Reid
    2. CODid that - and it should be something that I have done anyway, but I'm still getting the same error. Thanks though!
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    3. COThe answer here fixed my problem - ###See also > http://stackoverflow.com/questions/9349666/binding-a-callback-in-backbone-js-and-underscore-js?rq=1 - what to do now?
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