title: jquery check if asp checkbox is checked
body: <p>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:</p>
  
  <pre><code> &lt;asp:CheckBox runat="server" CssClass="checkbox" Checked="true" ID="checkboxRules" /&gt;
  </code></pre>
  
  <p>Thanks in advance, Laziale</p>
  
  <p>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:</p>
  
  <p>function enterClick() {
          $('#SUBMIT').click();
      }</p>
  
  <pre><code>var ishown = false;
  $(document).ready(function () {
      $('#BUTTON').click(function (e) {
  </code></pre>
  
  <p>//I want to put the checkbox logic here</p>
  
  <p>Thanks again</p>