无法获取在JavaScript中的HTML复选框值 [英] Can't get HTML checkbox value in JavaScript

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?

推荐答案

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）

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