【原创】knockout--添加radio的checked绑定

直接上代码:

<p>Send me spam: <input type="checkbox" data-bind="checked: wantsSpam" /></p>

<div data-bind="visible: wantsSpam">

    Preferred flavor of spam:

    <div><input type="radio" name="flavorGroup" value="cherry" data-bind="checked: spamFlavor" /> Cherry</div>

    <div><input type="radio" name="flavorGroup" value="almond" data-bind="checked: spamFlavor" /> Almond</div>

    <div><input type="radio" name="flavorGroup" value="msg" data-bind="checked: spamFlavor" /> Monosodium Glutamate</div>

</div>

 

<script type="text/javascript">

    var viewModel = {

        wantsSpam: ko.observable(true),

        spamFlavor: ko.observable("almond") // Initially selects only the Almond radio button

    };

     

    // ... then later ...

    viewModel.spamFlavor("msg"); // Now only Monosodium Glutamate is checked

</script>

这是官网上的一段代码,可以看出有三个radio,他们的checked属性都绑定在spamFlavor上,初值是“almond”,这样默认的value是“almond”的radio被选中。

刚开始我以为checked的有效值是true或false,后来才清楚原来有效值是radio的value属性。

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