knockout 与checkbox联动

knockout 通过teplate实现简单的代码实现复杂的操作绑定checkbox，代码如下自我感觉很赞！！！

前台HTml

<ul data-bind="template: { name: 'choiceTmpl', foreach: choices, templateOptions: { selections: selectedChoices } }">
</ul>
<script id="choiceTmpl" type="text/html">
 < li > <input type = "checkbox"data - bind = "attr: { value: $data }, checked: $item.selections" / ><span data - bind = "text: $data" > </span>     </li >
</script>
<hr />
<div data-bind="text: ko.toJSON(selectedChoices)">
</div>
<hr />
<div data-bind="text: selectedChoicesDelimited">
</div>

前台JS

var viewModel = {     choices: ["one", "two", "three", "four", "five"],     selectedChoices: ko.observableArray(["two", "four"]) };

viewModel.selectedChoicesDelimited = ko.dependentObservable(function() {     return this.selectedChoices().join(","); }, viewModel);

ko.applyBindings(viewModel);

在线Fiddle演示如下

http://jsfiddle.net/rniemeyer/Jm2Mh/