jquery检查是否选中了asp复选框 [英] jquery check if asp checkbox is checked

问题描述

大家好，我有一个复选框，我想在回发之前检查它是否在客户端检查或不检查。
这是复选框：

Hello everyone I have a checkbox I want to check if its checked or no on client side, before postback happens. Here is the checkbox:

 <asp:CheckBox runat="server" CssClass="checkbox" Checked="true" ID="checkboxRules" />

提前致谢，Laziale

Thanks in advance, Laziale

更新：
问题是页面上还有一个由js代码触发的按钮，也许我可以在那里添加一行来检查单击按钮后是否选中了复选框，否则显示取消选中的消息复选框：

UPDATE: The problem is that there is a button on the page too which is triggered by js code, and maybe I can add a line there to check if the checkbox is checked once the button is clicked, otherwise display message for unchecked checkbox:

函数enterClick（）{
$（'＃SUBMIT'）。click（）;
}

function enterClick() { $('#SUBMIT').click(); }

var ishown = false;
$(document).ready(function () {
    $('#BUTTON').click(function (e) {

//我想把复选框逻辑放在这里

//I want to put the checkbox logic here

再次感谢

推荐答案

由于它是服务器端的复选框，它会发送类似< input type =checkboxclass =checkbox/> ; 在ASP.NET处理控件后作为HTML发送给客户端。

Since it is a server-side Checkbox, it will send something like <input type="checkbox" class="checkbox" /> as HTML to the client after ASP.NET processes the control.

复选框的id不会像你一样是checkboxRules在源代码中有它.ASP.NET将连接服务器端表单id +主页面id（如果使用母版页）+ checkboxRules，所以在这种情况下我不会使用依赖于元素id的选择器。

The id of the checkbox isn't going to be checkboxRules as you have it in the source code. ASP.NET will make a concatenation of the server-side form id + master page id (if using a master page) + checkboxRules so in this case I won't use a selector that depends on element id.

我们可以使jQuery选择器尽可能窄，只选择类型为checkbox且CSS类为checkbox的输入。

We can make a jQuery selector as narrow as possible to only select inputs with a type of "checkbox" and with a CSS class of "checkbox".

$('input[type=checkbox] .checkbox').attr('checked')

将返回输入检查状态的布尔值。这将在页面上找到该CSS类的复选框。

will return the boolean value of the check status of the input. This will find any input on the page that is a checkbox with that CSS class.

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