CODEWITHSUNDEEP
javascriptbackbone.js
user1834464
user1834464

Reputation:

Backbone asynchronous view instantiations

I would need to do something like this:

new app.view().done(function() {})

That's because I am setting the view element asynchronously in the initialize function and I need to use the element right after the instantiation.

If I do this it doesn't work:

var view = new app.view();
var $el = view.$el;

Because the view element isn't ready yet.

Again, I need something like this:

new app.view().done(function(view) {
    var $el = view.$el;
})

But I can't find any ways to do this. Would overriding the constructor help me with this?

Upvotes: 3

Views: 294

Answers (1)

Kyle Needham
Kyle Needham

Reputation: 3389

Option 1 - Backbone.Events - example

You could trigger an event after the $el has been asynchronously created like this:

app.view = Backbone.view.extend({
    initialize: function ()
    {
        // async setup the $el and then do the following after it is created
        this.trigger('el:created', this.$el);
    }
});

And then all other views can listen to this event and act accordingly:

app.anotherView = Backbone.view.extend({
    initialize: function ()
    {
        var otherView = new app.view();

        // Only fires once so only listen once
        this.listenToOnce(otherView, 'el:created', this.createEl);
    },

    createEl: function ($el)
    {
        //do something with $el here
    }
});

Option 2 - jQuery.Deffered - example

app.view = Backbone.view.extend({
    initialize: function ()
    {
        this.elCreation = $.Deferred();

        // async setup the $el and then do the following after it is created
        this.elCreation.resolve(this.$el);
    }
});

new app.view().elCreation.done(function($el)
{
    //do something with $el here
});

Upvotes: 1

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