JavaScript 表单验证

[ 2012-11-28 09:33:57 | 作者: admin ]

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<html>
<head>
<script type="text/javascript">

function validate_required(field,alerttxt)
{
with (field)
   {
   if (value==null||value=="")
   {alert(alerttxt);return false}
   else {return true}
   }
}

function validate_form(thisform)
{
with (thisform)
   {
   if (validate_required(email,"Email must be filled out!")==false)
   {email.focus();return false}
   }
}
</script>
</head>

<body>
<form action="submitpage.htm" onsubmit="return validate_form(this)" method="post">
Email: <input type="text" name="email" size="30">
<input type="submit" value="Submit">
</form>
</body>

</html>