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2012-09-25T19:07:30.473
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2012-09-25T19:07:30.473
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You'll need to modify the LayoutManger to handle asynchronous rendering of templates. One of the ways to do this is to use the jQuery Deferred object where the call to <code>render</code> returns an instance of a <code>Deferred</code> object, which you then resolve in the call to the <code>Dust</code> library. Then, modify Backbone.LayoutManager to NOT continue doing what it wants to with the templates until that Deferred object has been resolve. in <code>render</code>: <pre><code>render: (template, context) -> dfd = $.Deferred() dust.render @template, context, (err, out) -> throw err if err done(out) dfd.resolve() return dfd; </code></pre> You then take the method in Backbone.LayoutManager that calls render and instead of doing something with the return from render you attach that "something" to the <code>done</code> handler for the deferred you passed back. <pre><code> dfd = render(template, context) dfd.done(do_something_with_this_template); </code></pre> I'm using Marionette.js (along with it's async variant) and dust, this is what my core <code>render</code> method looks like: <pre><code> render: function(){ var dfd = $.Deferred(); var template_context = this.model; if(_.isUndefined(template_context) || _.isFunction(template_context)){ template_context = new (Backbone.Model.extend({})); } if(this.id) this.$el.attr('id', this.id); var that = this; dust.stream(this.tpl_name, template_context.toJSON()) .on('data', function(data){ that.$el.html(data); }) .on('end', function(){ dfd.resolve(); that.enable_menus(); that.trigger('template:rendered'); }) .on('error', function(err){ dfd.reject(); window.le(err.message, err); that.trigger('template:error'); }); return dfd; } </code></pre> (Obviously not using coffeescript either...)
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