Javascript Example
Screen shot
Screen shot
Javascript code to validate Blank field
<html>
<head>
<title>Javascript Blank Field Validation</title>
<script language="javascript">
function validate()
{
if(document.frm.name.value=='')
{
alert("Please Enter Name");
document.frm.name.focus();
return false;
}
return true;
}
</script>
</head>
<body>
<form name="frm" action="" method="post" onSubmit="return validate()">
<table border="1" align="center">
<tr>
<td>Enter Name</td>
<td><input name="name" type="text"></td>
</tr>
<td colspan="2">
<input name="btnsubmit" type="submit" value="Submit">
</td>
</tr>
</table>
</form>
</body>
</html>
You can download source code here