Home > Developer > Web Develop

Ajax implementation of jquery login verification

Source: Internet
Author: User
Developer on Alibaba Coud: Build your first app with APIs, SDKs, and tutorials on the Alibaba Cloud. Read more ＞

This article focuses on the $.post method to implement Ajax

Login page Code

<meta http-equiv= "Content-type" content= "text/html; Charset=utf-8 "/>
<script type= "Text/javascript" src= "Jquery-1.7.1.min.js" ></script>
<title>login</title>
<body>
<form action= "login.php" method= "POST" >
Login name: <input type= "text" name= "username" >
<div id= "Massage" ></div>
Password: <input type= "password" name= "password" >
<input type= "Submit" value= "Submission" >
<a href= "register.html" > Registration </a>
</form>
<script type= "Text/javascript" >
$ (function () {
$ (': input[name= "username"]). Change (function () {
txt=$ (': input[name= "username"]). Val ();
$.post ("ajax.php", {username:txt},function (result) {
$ ("#massage"). HTML (result);
});
});
});
</script>
</body>

Code for the ajax.php page

<?php
$mysqli = new mysqli (' localhost ', ' root ', ' ', ' Java ');
if ($username =$_post[' username ') {
    $result = $mysqli->query ("SELECT * from User WHERE username=". "' $username ' ");
    $rs 1= $result->fetch_row ();
    if ($rs 1) {
        $arr = "<font color= ' Red ' > user already exists </font>";
        Echo $arr;
    }
    else{
        $arr = "<font color= ' green ' > This user is available </font>";
        Echo $arr;
    }

}





Register page code

<meta http-equiv= "Content-type" content= "text/html; Charset=utf-8 "/>
<script type= "Text/javascript" src= "Jquery-1.7.1.min.js" ></script>
<title>register</title>
<body>
<form action= "register.php" method= "POST" >
Login name: <input type= "text" name= "username" >
<div id= "Massage" ></div>
Password: <input type= "password" name= "password" >
Repeat Password: <input type= "password" name= "Password2" >
<div id= "Massage1" ></div>
<input type= "Submit" value= "Submission" >
<a href= "index.html" > Login </a>
</form>
<script type= "Text/javascript" >

$ (function () {

$ (': input[name= "username"]). Change (function () {
txt=$ (': input[name= "username"]). Val ();
$.post ("ajax.php", {username:txt},function (result) {
$ ("#massage"). HTML (result);
});
});

$ (': Input[name= "Password2"]). Change (function () {
txtpass=$ (': input[name= "password"]). Val ();
txtpass2=$ (': Input[name= "Password2"]). Val ();
if (TXTPASS&AMP;&AMP;TXTPASS2) {
$.post ("regajax.php", {password:txtpass,password2:txtpass2},function (result) {
$ ("#massage1"). HTML (result);
});
}

});


$ (': input[name= "password"]). Change (function () {
txtpass=$ (': input[name= "password"]). Val ();
txtpass2=$ (': Input[name= "Password2"]). Val ();
if (TXTPASS&AMP;&AMP;TXTPASS2) {
$.post ("regajax.php", {password:txtpass,password2:txtpass2},function (result) {
$ ("#massage1"). HTML (result);
});
}

});


});



</script>
</body>


regajax.php Code

<?php
if ($_post[' password ']) {
    if ($_post[' Password2 ']) {
        if ($_post[' password ']!=$_post[' Password2 ')} {
            $arr = "<font color= ' red ' > two times Password input inconsistent </font>";
            Echo $arr;
        }
    }


}





The above is the Code section
The points to note are
The code for the event-triggered execution is placed in an empty $ (function () {});
1.$ (function () {
    $ (': input[name= "username"]). Change (function () {
        txt=$ (': input[name= "username"]). Val ();
        $.post ("ajax.php", {username:txt},function (result) {
            $ ("#massage"). HTML (result);
        });
    });
});

2.
$ (': input[name= "username"]). Change  This is the representation of one of the label's name properties

3. $.post (Sent to the address, the parameter is sent {key:values,key2:values2}, the callback function functions (arbitrarily using a parameter to represent the returned data) {return data after the execution of the function statement})

4.$arr = "<font color= ' green ' > This user is available </font>";
Echo $arr;
Returns the HTML format  directly echo even returned
If you return a JSON format, you need to use  echo json_code ($arr);


Ajax implementation of jquery login verification

This article is an English version of an article which is originally in the Chinese language on aliyun.com and is provided for information purposes only. This website makes no representation or warranty of any kind, either expressed or implied, as to the accuracy, completeness ownership or reliability of the article or any translations thereof. If you have any concerns or complaints relating to the article, please send an email, providing a detailed description of the concern or complaint, to info-contact@alibabacloud.com. A staff member will contact you within 5 working days. Once verified, infringing content will be removed immediately.

Related Keywords:
jquery unobtrusive ajax min jquery ajax encoding jquery ajax file upload codeigniter jquery ajax jquery ajax rest jquery ajax upload multiple files php jquery ajax json example

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.

What's Trending
Top 10 Tags
datastax versions naming convention zookeeper client class definition md5 microsoft sql server 2005 data structures exception handling error handling
Top 10 Keywords
microsoft download center down wordpress address url site address url wordpress address url windows installer 4 0 download 302 not found web address url definition site address url wordpress db2 integer mac os installation step by step pdf abbreviation for return

A Free Trial That Lets You Build Big!

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

Get Started for Free

  • Sales Support

    1 on 1 presale consultation

    Chat Contact Sales

  • After-Sales Support

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

    Open a Ticket

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

    Learn More