If the textfield has been changed : TextField : Form Control JAVASCRIPT DHTML TUTORIALS

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If the textfield has been changed



<html>
<head>
<script language="JavaScript">
<!-- 
function taChange() {
  alert("The text-area field has changed.");
}
//-->
</script>
</head>
<body>
<form>
Enter some text: 
<input type="text" size=35 name="sometext"><p>Enter some more text:<br> 
<textarea name="tarea" rows=5 cols=40 onChange="taChange()">
</textarea>
</form>
</body>
</html>