jquery check if asp checkbox is checked

Question

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" />

Thanks in advance, Laziale

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:

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

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

//I want to put the checkbox logic here

Thanks again

Answer 1

try...

if ($('#<%= checkboxRules.ClientID %>').is(':checked')) {
...
}