Adds support for checkbox arrays

[kerinin]

Checkboxes can now be given an identifier terminating
in [] to denote that the value attribute should be used
as an array key. For example, given the following form

<input type="checkbox" id="foo[]" value="bar"/>
<input type="checkbox" id="foo[]" value="baz" checked="checked"/>

the model binding would generate an array Model.foo = ['baz']

Setting the value to another array updates the checkbox states, so

Model.set('foo', ['bar'])

would produce

<input type="checkbox" id="foo[]" value="bar" checked="checked"/>
<input type="checkbox" id="foo[]" value="baz" />

in the view.

[eddanger]

+1

[shine-on]

using this in our project with no issues. please commit.

[sarxos]

I integrated your solution in my fork since this project has been abandoned and this pull request probably never be merged. For Backbone.ModelBinding project continuation see:

https://github.com/oaprnd/backbone.modelbinding

Regards

[sarxos]

Oh, and by the way - your change in sample.backbone.app.js breaks Jasmine tests performed on HtmlUnitDriver. That's because of the unnecessary comma in the HTML code:

<input type='checkbox' id='endorsements[]', value='class_b'>

Should be:

<input type='checkbox' id='endorsements[]' value='class_b'>