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Sometimes it becomes necessary to process user input client side. It saves the user a lot of time if he/she is notified of errors in his/her errors before submitting the form. This example contains two functions for validating email addresses and urls.
| <!doctype html public "-//w3c//dtd html 4.01 transitional//en">
<html>
<head>
<title>JavaScrip URL & Email Validation</title>
<meta http-equiv="Content-Type" content="text/html;charset=utf-8" />
<script type="text/javascript">
<!--
function isValidURL(url){
var RegExp = /^(([\w]+:)?\/\/)?(([\d\w]|%[a-fA-f\d]{2,2})+(:([\d\w]|%[a-fA-f\d]{2,2})+)?@)?([\d\w][-\d\w]{0,253}[\d\w]\.)+[\w]{2,4}(:[\d]+)?(\/([-+_~.\d\w]|%[a-fA-f\d]{2,2})*)*(\?(&?([-+_~.\d\w]|%[a-fA-f\d]{2,2})=?)*)?(#([-+_~.\d\w]|%[a-fA-f\d]{2,2})*)?$/;
if(RegExp.test(url)){
return true;
}else{
return false;
}
}
function isValidEmail(email){
var RegExp = /^((([a-z]|[0-9]|!|#|$|%|&|'|\*|\+|\-|\/|=|\?|\^|_|`|\{|\||\}|~)+(\.([a-z]|[0-9]|!|#|$|%|&|'|\*|\+|\-|\/|=|\?|\^|_|`|\{|\||\}|~)+)*)@((((([a-z]|[0-9])([a-z]|[0-9]|\-){0,61}([a-z]|[0-9])\.))*([a-z]|[0-9])([a-z]|[0-9]|\-){0,61}([a-z]|[0-9])\.)[\w]{2,4}|(((([0-9]){1,3}\.){3}([0-9]){1,3}))|(\[((([0-9]){1,3}\.){3}([0-9]){1,3})\])))$/
if(RegExp.test(email)){
return true;
}else{
return false;
}
}
function checkField(){
var frm = document.frmValidate, error = "";
if(!isValidURL(frm.url.value)){
error += "Please enter a valid URL\n";
}
if(!isValidEmail(frm.email.value)){
error += 'Please enter a valid Email\n';
}
if(error != ""){
alert(error);
return false;
}else{
return true;
}
}
//-->
</script>
</head>
<body>
<table height="100%" width="100%">
<tr><td>
<center><form name="frmValidate" onsubmit="return checkField()">
<table cellspacing="2" cellpadding="5" border="1">
<tr><td>Enter Valid URL : </td>
<td><input type="text" name="url"></td></tr>
<tr><td>Enter Valid Email : </td>
<td><input type="text" name="email"></td></tr>
<tr><td colspan="2"><center><input type="submit" value="Check"></center></td></tr>
</table>
</form></center>
</td></tr></table>
</body>
</html> | |
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