无法获取在JavaScript中的HTML复选框值

问题描述：

我试图让它可以是用户输入或从数据库中检索ASP.NET复选框值。但每次它显示此错误消息

I'm trying to get ASP.NET checkbox value which can be user input or retrieved from database. But each time it's showing this error message

0x800a138f - JavaScript的运行时错误：无法获取属性值 未定义或空引用

0x800a138f - JavaScript runtime error: Unable to get property 'value' of undefined or null reference

我的HTML code：

My HTML code:

<input type="checkbox" id="myCheck" data-member="IsSubGroupNecessary" data-label="" data-provider="checkbox" onchange="IsSubGroupNeeded();"/>

JavaScript的code：

JavaScript Code:

function IsSubGroupNeeded() {
    var Subgrp = document.getElementById('<%=myCheck.ClientID%>').checked;
    if (Subgrp == true) {
        loadgrdSubgroupItem();
    }
};

更新：
错误问题被解决。
但我想打电话给loadgrdSubgroupItem功能时复选框值为true无论是用户输入或从数据库中检索。怎么办呢？

Update: The error issue is solved. But I want to call loadgrdSubgroupItem function when checkbox value is true whether it is user input or retrieved from database. How to do it?

答

您呈现HTML有 myCheck 的ID，所以你应该能够：

Your rendered HTML has an id of myCheck so you should be able to:

function IsSubGroupNeeded() {
    var Subgrp = document.getElementById('myCheck').checked;
    if (Subgrp == true) {
        loadgrdSubgroupItem();
    }
};

在不需要服务器侧呼叫

Without the need for the server side call.

（我假设你拥有的你的asp.net标记的ClientIDMode =静态）

无法获取在JavaScript中的HTML复选框值

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