title: Display an alert box when ticking checkbox in Jquery
body: <p>How to display an alert box when ticking checkbox in Jquery? The alert box will disappear when checkbox is unticked.</p>
  
  <p>I have tried the code below,but it doesn't work. Can anyone help me out? Thanks!</p>
  
  <pre><code>&lt;script type="text/javascript"&gt;
          $(document).ready(function(){
  
              if($('#chkAll').is(':checked'))
             {
                alert("im checked");
  
             }
  
          });
          &lt;/script&gt;
  &lt;input id="chkAll" /&gt;
  </code></pre>