detect select status of options in a multiselect with backbone.picky - backbone.js

Question

I have a multiselect dropdown that I'm rendering with Backbone. As user selects or deselects options, I'd like those (de)selections to be saved asynchronously via Backbone.
I found Backbone.Picky, and thought it might be helpful in my endeavor, but I can't seem to get it to detect selects.
In my FieldView's clicked function below, console.log(this.model.selected); always writes undefined to the log. Why?
var Field = Backbone.Model.extend({
initialize: function(){
var selectable = new Backbone.Picky.Selectable(this);
_.extend(this, selectable);
}
});
var FieldView = Backbone.View.extend({
tagName: "option",
initialize: function(){
_.bindAll(this, 'render');
},
events: {
"click":"clicked"
},
clicked: function(e) {
var data_type = this.model.get("DATA_TYPE");
console.log(this.model.selected); // why is this undefined?
console.log("it's a " + data_type);
},
render: function(){
this.$el.attr('value', this.model.get('COLUMN_NAME')).html(this.model.get('display_name'));
return this;
}
});
Here's a jsfiddle http://jsfiddle.net/EAZCt/2/ for more context.
Using Backbone, how can I asynchronously save the select-status of options in a multiselect list?

Answer 1

Your model object doesn't ever have "selected" property because you never select the model. I have never used Backbone.Picky but it seems that you could try:
var FieldView = Backbone.View.extend({
tagName: "option",
initialize: function(){
this.model.on('selected', this.selected, this);
},
events: {
"click":"clicked"
},
clicked: function() {
this.model.select();
},
selected: function() {
var data_type = this.model.get("DATA_TYPE");
console.log(this.model.selected);
console.log("it's a " + data_type);
},
render: function(){
this.$el.attr('value', this.model.get('COLUMN_NAME')).html(this.model.get('display_name'));
return this;
}
});
http://jsfiddle.net/hGEYL/