Home > Developer > PHP

User registration to detect if the user name exists Ajax + PHP code

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

<!--
t.php Code

The code is as follows Copy Code

?
$title = isset ($_get[' title ')] $_get[' title ': ';
if ($title)
{
$sql = ' Select id from filecontent where title= '. $title. ';
$q = MySQL Tutorial _query ($sql) or Die (Mysql_error ());
if (mysql_num_rows ($q))
{
Echo 1;
}
Else
{
echo 0;
}
}
Else
{
echo 0;
}
?>

<!doctype HTML PUBLIC "-//W3C//DTD XHTML 1.0 transitional//en" "http://www.w3.org/tr/xhtml1/dtd/ Xhtml1-transitional.dtd ">
<meta http-equiv= "Content-type" content= "text/html; charset=gb2312 "/>
<title> user registration to detect whether the user name exists Ajax + PHP code </title>
<script>
User registration to detect if the user name exists Ajax + PHP code


function Createxmlhttprequest () {//Create XMLHttpRequest Object
if (window.activexobject) {//ie
try {
return new ActiveXObject ("Microsoft.XMLHTTP");
catch (e) {
Return
}
}else if (window.xmlhttprequest) {//mozilla,firefox
try {
return new XMLHttpRequest ();
catch (e) {
Return
}
}
}

Function Getrenews (value) {//Keynote
 var xmlhttp=createxmlhttprequest ();
 var url = "t.php?action= Check&title= "+value+" &mt= "+math.random (300000);
 if (value== "") {  
  return false;
 }
 if (XMLHTTP) {
 & Nbsp;callback = Getreadystatehandler (XMLHTTP);
  xmlhttp.onreadystatechange = callback;
  xmlhttp.open ("Get", url,true);
  xmlhttp.send (NULL);
 }
}
//Return 0 is available on behalf of the user name, otherwise the prompt has already been registered.

Function Getreadystatehandler (XMLHTTP) {//server returns handler function
 return functions () {
  if ( Xmlhttp.readystate = 4) {
   if (xmlhttp.status =) {
       &NBSP
     
     if (xmlhttp.responsetext==1) {
       document.getelementbyid ("Checkid"). Innerhtml= "<font color= ' red ' > Sorry, the user name you entered is already registered! </font>      
     }else{
       document.getelementbyid ("Checkid"). Innerhtml= "can register";      
  &NBSP;&NBSP;&NBSP;&NBSP;}&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP
   }
  
&NBSP}
}
</script>

<body>
Adds a onblur event to the input box, detects the user name when the user enters the user name, and prompts for it.
Enter user name <input name= "title" type= "text" id= "title" Size= "" onblur= "Getrenews (this.value);" ><span id= "Checkid" ></SPAN>
</body>

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:
mysql drop user if exists user registration php php get user name php code to take input from user php detect ajax request php detect ajax online user counter php code

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