Backbone: Pass Model Attribute to a View returns undefined

Question

var ShapeSizePoolView = Backbone.View.extend({
    el : $('#agpb_shape_size_body'),    
    tmpl : $('#tmpl_agpb_shape_size').html(),
    initialize : function() {
        this.render();
    },
    render : function() {
        var compiled_template = _.template( this.tmpl, this.model.toJSON() ),
            sizes = this.model.get('sizes');
        $(this.el).append( compiled_template );

        // this is used for our pool sizes
        for(var i = 0; i < sizes.length; i++) {
            console.log(sizes[i]);
            new ShapeSizePoolButtonView(
            { 
                size : sizes[i],
                el : $(this.el).find('.agpb_size_list')
            });
        }
    }
});

var ShapeSizePoolButtonView = Backbone.View.extend({
    tmpl : $('.tmpl_agpb_shape_size_button').html(),
    initialize : function() {
        // this.render();
        console.log( this.size );
        },
        render : function() {
            var compiled_template = _.template( this.tmpl, this.sizes );
            $(this.el).append( compiled_template );
        }
});

this.model.get('sizes') returns an array of objects. If I console.log one of the objects in ShapeSizePoolView I get:

{
    id: "6", 
    dimensions: "12'",
    price: "649.99", 
    sort_order: "1"
} 

I pass this object to a new view but if I console.log this.size from ShapeSizePoolButtonView I get:

undefined

Does anyone have an idea of where I am going wrong?

Thanks!

Answer 1

From the Backbone docs :

When creating a new View, the options you pass — after being merged into any default options already present on the view — are attached to the view as this.options for future reference. There are several special options that, if passed, will be attached directly to the view: model, collection, el, id, className, tagName and attributes.

So, you can access this custom option by using this.options :

var ShapeSizePoolButtonView = Backbone.View.extend({
    tmpl : $('.tmpl_agpb_shape_size_button').html(),
    initialize : function() {
        // this.render();
        console.log( this.options.size ); // Not this.size
    },
    ....
});

Answer 2

You are passing size to the View constructor, but it will not get copied onto this automatically. You would need to add code like this:

var ShapeSizePoolButtonView = Backbone.View.extend({
  initialize : function(options) {
    this.size = options.size;
    // this.render();
    console.log( this.size );
  },

Also, you are incorrectly using this.sizes instead of this.size in your render call.