KnockOut data-bind =“ visible：需要帮助以解决问题

Question

I want to hide the div if array length is >0. 如果数组长度> 0，我想隐藏div。 By putting an alert message I confirmed array length is = 0 and then div should be hidden. 通过发出警报消息，我确认数组长度为= 0，然后应隐藏div。 But when run the app div is visible. 但是在运行时，应用程序div是可见的。

<body>
    <form id="form1" runat="server">
    <div>

    <div data-bind="visible: myValues().length > 0">
    You will see this message only when 'myValues' has at least one member.
</div>


    </div>
    </form>
</body>
<script type="text/javascript">
    var viewModel = {
        myValues: ko.observableArray([]) // Initially empty, so message hidden
    };
    alert('The length of the array is ' + viewModel.myValues().length);
</script>

Answer 1

<body>
    <form id="form1" runat="server">
    <div>

    <div data-bind="visible: myValues().length > 0">
    You will see this message only when 'myValues' has at least one member.
   </div>

You need to bind this with applybindings: 您需要使用applybindings绑定它：

    </div>
    </form>
</body>
<script type="text/javascript">
    var viewModel = {
        myValues: ko.observableArray([]) // Initially empty, so message hidden
    };
    alert('The length of the array is ' + viewModel.myValues().length);



    ko.applyBindings(viewModel); 
</script>

KnockOut data-bind =“ visible：需要帮助以解决问题

问题描述

1 个解决方案

解决方案1
1 已采纳 2014-09-02 05:12:57

KnockOut data-bind =“ visible：需要帮助以解决问题

问题描述

1 个解决方案

解决方案1 1 已采纳 2014-09-02 05:12:57

解决方案1
1 已采纳 2014-09-02 05:12:57