Web | This Site

Learn Prototype
Prototype Resources
Selected Reading
© 2011 TutorialsPoint.COM

| Home |  | References |  | Discussion Forums |  | About TP

# Prototype Form.Element present() Method

This method returns true if a text input has contents, false otherwise.

## Syntax:

    formElement.present();

## Return Value :

- It returns true if a text input has contents, false otherwise.

## Example:

Try to submit the following form first without filling out the information, then again after typing some text in the fields:

    <html>
    <head>
    <title>Prototype examples</title>
       <script type="text/javascript"
       src="/javascript/prototype.js">
       </script>
    <script>
    function showResult()
    {
      var valid, msg = $('msg')

      // are both fields present?
      valid = $('username').present() && $('email').present()

      if (valid) {
        // in real world we would return true here to allow the
        // form to be submitted return true
        msg.update('Passed validation!').style.color = 'green'
      } else {
        msg.update('Fill out all the fields.').style.color = 'red'
      }
      return false
    }
    </script>
    </head>

    <body>

      <p>Click the button to see the result.</p>
      <br />

      <form id="example" action="#">
      <fieldset>
        <legend>User Details</legend>
        <p style="color:green;" id="msg">
    	Fill out all the fields:
        </p>

        <div>
          <label for="username">Username</label>
          <input id="username" name="username" type="text">
        </div>

        <div>
          <label for="email">Email Address</label>
          <input id="email" name="email" type="text">
        </div>
        <div>
           <input value="result" type="button" onclick="showResult();>
        </div>
      </fieldset>
      </form>

    </body>
    </html>

To understand it in better way you can Try it yourself.

Advertisement

Online Image Processing

Indian Baby Names