title: JS Validation if dropdown value selected or not
body: <p>I am trying to write a validation block inside my JS to check if the user has selected a value or not and pop up a message if the value is not selected. </p>
  
  <pre><code>function validate(form) {
      var success = true;
      var message = "";
  
      if (form.dropdown.selectedIndex ==  0 )  {  
          form.save.disabled=true;
  
          if (0 &lt; message.length) {
              message += "\n"; 
          }
          message += "dropdown  value should be selected.";
      }
  
      if (0 &lt; message.length) {
          alert(message);
          success = false;
      }
  
      return success;
  }
  </code></pre>
  
  <p>When I click on Save button I call this function. I don't see errors in the logs. 
  Can anyone tell me what am I doing wrongly here? Or can you guide me what is the correct method to validate if the user has selected a value before allowing to save?</p>
  
  <p>Thanks!</p>