[an error occurred while processing this directive]

JavaScript Combo Box Validation

                         

This application illustrates how to validate the combo box using JavaScript validation.

In this example we create a combo box of different technologies where if user select any technology and press the submit button then he/she successfully process the next step of the application but if user not select any technology then he/she got a alert message.

 

The Example is as follows:

 

Source Code of combo.html 

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
  <HEAD>
    <TITLE>ComboBox Validation</TITLE>

    <script Language="JavaScript">
      function validateR(){
        var selectedCombobox=(comboForm.technology.value);
        if (selectedCombobox=="-1") {
          alert("Please Select Technology");
          return false;
        }
        return true;
      }
    </script>

  
 </HEAD>

 <BODY>
  <form name="comboForm">
    <select name="technology">
      <option value="-1">Select</option>
      <option value="JSP">Java Server Pages</option>
      <option value="Servlet">Servlet</option>
      <option value="PHP">PHP</option>
      <option value="ASP">ASP</option>
    </select>

    <input type="submit" value="submit" onclick="return validateR();">
  </form>
  
 </BODY>
</HTML>

 

Download Source Code

                         

[an error occurred while processing this directive]