title: How to call javascript function only when checkbox is checked
body: <p>i have tried this:</p>
  
  <pre><code>    function stickyheaddsadaer() {
          $("#page-header-inner").addClass("sticky");
      }
  
      &lt;input type="checkbox" name="TT_sticky_header" id="TT_sticky_header_function" 
  value="{TT_sticky_header}" onclick="stickyheaddsadaer()"/&gt;
  </code></pre>
  
  <p>so when i click checkbox, it just nothing happens....</p>
  
  <p>but when i try this:</p>
  
  <pre><code>function stickyheaddsadaer() {
      alert("I am an alert box!");
  }
  </code></pre>
  
  <p>then works...</p>
  
  <p>can you please help me ? I need to activate javasript function by checkbox</p>
  
  <p>and when the js function is actived it add class to the div</p>
  
  <p>Thank you</p>