CODEWITHSUNDEEP
backbone.jscoffeescript
Andy
Andy

Reputation: 11008

Rendering backbone views with collection in callbacks

Here is a view I am working with:

class Raffler.Views.EntriesIndex extends Backbone.View
  template: JST['entries/index']

  initialize: ->
    @collection.on('reset', @render, this)

  render: ->
    Raffler.entries = @collection
    $(@el).html(@template(eventSource: (start, end, callback) ->
      console.log @collection # = undefined
      callback(Raffler.entries.events(start, end))
    ))

I had to assign window.Raffler property to my collection to be able to use it in the callback. Is there a nice way of using something like callback(@collection.events(start, end))?

Upvotes: 0

Views: 249

Answers (2)

heavi5ide
heavi5ide

Reputation: 1609

In coffeescript, if you use the "fat arrow" (=>) operator instead of ->, your callback function will be bound to the this (@) in the scope in which it is created. This means you can use @collection within your callback and @ will properly refer to your EntriesIndex, so your render function can just look like this:

render: ->
  $(@el).html(@template(eventSource: (start, end, callback) =>
    console.log @collection # == your EntriesIndex collection
    callback(@collection.events(start, end))
  ))

See http://coffeescript.org/#fat_arrow

My suggestion above will only work if this (@) refers to your EntriesIndex within render, so I believe you may have to do as Abraham suggested as well and make sure to bind @ to your EntriesIndex within the render function. Add this to initialize:

_.bindAll this

Someone who knows Coffeescript can correct me if I'm wrong on that syntax :)

Upvotes: 1

abraham
abraham

Reputation: 47893

Inside of initialize if you this.bindAll(this); then this.collection should work inside of render.

Upvotes: 1

Related Questions