Try testing the following form with valid and invalid email addresses The code uses javascript to match the users input with a regular expression 函数代码: 复制代码 代码如下: function validate(form_id,email) { var reg = ^([A-Za-z0-9_ - ])+ @([A-Za-z0-9_ - ])+ ([A-Za-z]{2,4})$ ; var address = document forms[form_id] elements[email] value; if(reg test(
Try testing the following form with valid and invalid email addresses. The
code uses javascript to match the users input with a regular expression.
函数代码:
复制代码 代码如下:

function validate(form_id,email) {
var reg = /^([A-Za-z0-9_\-\.])+\@([A-Za-z0-9_\-\.])+\.([A-Za-z]{2,4})$/;
var address = document.forms[form_id].elements[email].value;
if(reg.test(address) == false) {
alert('Invalid Email Address');
return false;
}
}

In the forms ‘onsubmit' code call javascript:return validate(‘form_id','email_field_id')
使用方法:
复制代码 代码如下:

<form id="form_id" method="post" action="action.php" onsubmit="javascript:return validate('form_id','email');">
<input type="text" id="email" name="email" />
<input type="submit" value="Submit" />
</form>

You should not rely purely on client side validation on your website / web application, if the user has javascript disabled this will not work. Always validate on the server.
from: http://www.white-hat-web-design.co.uk/blog/javascript-validation/

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