Use jQuery. Validate to asynchronously verify whether the user name exists (recommended). jquery. validate is asynchronous.

Source: Internet
Author: User
Tags html header

Use jQuery. Validate to asynchronously verify whether the user name exists (recommended). jquery. validate is asynchronous.

HTML header reference:

<script type="text/JavaScript" src="../js/jQuery-1.3.2.min.js"></script><script type="text/javascript" src="../js/jquery.validate.min.js"></script><script type="text/javascript" src="../js/messages_cn.js"></script>

HTML content (Part ):

<Form name = "form1" id = "form1" method = "post" action = ""> <dl> <dt> User name: </dt> <dd> <input name = "txtUserName" id = "txtUserName" type = "text" class = "input1"/> </dd> </dl> </form>

JS Code:

$ (Function () {// Form Verification JS $ ("# form1 "). validate ({// tag errorElement: "span", rules: {txtUserName: {required: true, minlength: 3, maxlength: 16, remote: {type: "post", url: "/tools/ValidateUserName. ashx ", data: {username: function () {return $ (" # txtUserName "). val () ;}, dataType: "html", dataFilter: function (data, type) {if (data = "true") return true; else return false ;}}}, success: function (label) {// The style label when the label is correct. text (""). addClass ("success") ;}, messages: {txtUserName: {required: "Enter the username, which must contain 3-16 characters (letters, numbers, and underscores). It cannot be changed after registration ", minlength: "User Name Length cannot be less than 3 characters", maxlength: "User Name Length cannot be greater than 16 characters", remote: "User Name unavailable "}}});});

Notes:

data: {  username: function() {  return $("#txtUserName").val();}

There is a return value. If you write it directly“data: {username: $("#txtUserName").val();}”,In this case, the value cannot be obtained.

The above section describes how to use jQuery. validate asynchronously verifies whether the user name exists. I hope it will help you. If you have any questions, please leave a message and I will reply to you in a timely manner. Thank you very much for your support for the help House website!

Related Article

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.