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>