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Accessing a method on a Backbone.js view inside of loop

Asked By: Anonymous

I’m working on an app that has an ItemListView that contains a number of ItemView elements. In my ItemListView, I’m using the jQuery .each() method to loop through the collection of items and render them as list elements.

I’ve got all the pieces in place except for the actual attaching of the li elements to the containing ul. The sticking point is getting access to the ItemListView.appendItem method from inside of my .each() loop. I’ve tried using this.appendItem and self.appendItem, but inside the loop this is the item and self is the window object.

Here’s what I have right now:

ItemListView = Backbone.View.extend({
    el: '#item-rows',
    initialize: function () {
        this.collection = new Items();
        this.render();
    },
    render: function () {
        $.each(this.collection.models, function (i, item) {
            var itemview = new ItemView( { model: item });
            this.appendItem(itemview); // this refers to the item, so appendItem is undefined
        });
    },
    appendItem: function (itemView) {
        $(this.el).append(itemView.render().el);
    }
});

var itemlistview = new ItemListView;

I’m pretty sure that the context issue is the only problem, as I’ve examined the other pieces of the this by outputting them to the console and they look fine.

What am I missing?


Solution

Answered By: Anonymous

Yeah, it’s a pretty simple fix. You just gotta refer to the this in the outer context.

render: function () {
    var somereftothis = this;
    $.each(this.collection.models, function (i, item) {
        var itemview = new ItemView( { model: item });
        somereftothis.appendItem(itemview); // this refers to the item, so appendItem is undefined
    });
},

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