Javascript Validation for email (Regular Expression) English Translation

Source: Internet
Author: User

Try testing the following form with valid and invalid email addresses.
Code uses javascript to match the users input with a regular expression.
Function Code: Copy codeThe Code is as follows: 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 ')
Usage:Copy codeThe Code is as follows: <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 shoshould 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/

Contact Us

The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion; products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the content of the page makes you feel confusing, please write us an email, we will handle the problem within 5 days after receiving your email.

If you find any instances of plagiarism from the community, please send an email to: info-contact@alibabacloud.com and provide relevant evidence. A staff member will contact you within 5 working days.

A Free Trial That Lets You Build Big!

Start building with 50+ products and up to 12 months usage for Elastic Compute Service

  • Sales Support

    1 on 1 presale consultation

  • After-Sales Support

    24/7 Technical Support 6 Free Tickets per Quarter Faster Response

  • Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.