Php+ajax to detect if a user name or mail registration already exists instance tutorial, ajax instance Tutorial _php Tutorial

Php+ajax to detect if a user name or message registration is already present, an AJAX instance tutorial

Php+ajax detecting whether a user name or message registration already exists is an important feature that is common in the Forum or membership system. This paper simply describes the implementation of this function in the form of an example. The steps are as follows:

First, the PHP detection page

The check.php page code is as follows:

Second, the AJAX verification page

The Check.js page code is as follows:

var xmlhttp;function s_xmlhttprequest () {  if (window. ActiveXObject) {    xmlHttp = new ActiveXObject (' microsoft.xmlhttp ');  } else if (window. XMLHttpRequest) {    xmlHttp = new XMLHttpRequest ();}  } function funtest100 () {  var f = document.getelementsbytagname_r (' form ') [0].user.value;//gets the contents of the text box  S_ XMLHttpRequest ();  Xmlhttp.open ("Get", "jcfor.php?id=" +f,true);//Open request  Xmlhttp.onreadystatechange = byphp;//ready for execution  Xmlhttp.send (null);//Send}function byphp () {  //Judgment Status  if (xmlhttp.readystate==1) {//ajax status    document.getelementbyidx_x_x (' test100 '). InnerHTML = "Loading";  }  if (xmlhttp.readystate==4) {//ajax status    if (xmlhttp.status==200) {//server-side State      var bytest100 = Xmlhttp.responsetext;      alert (bytest100);      document.getelementbyidx_x_x (' test100 '). InnerHTML = bytest100;}}    }

Third, PHP verification page

The chkfor.php page code is as follows:

<?php if ($_get[id]) {    sleep (1);    $conn =mysql_connect (' localhost ', ' root ', ');    mysql_select_db (' Test ', $conn);    $sql = "SELECT * from ' user ' WHERE ' name ' = ' $_get[id] '";    $q =mysql_query ($sql);     if (Is_array (Mysql_fetch_row ($q))) {      echo "user name already exists";     } else{      echo "User name can be used";     }}  ? >

I hope that the examples described in this article will help you to develop PHP programs.

That friend has Php+ajax code to verify the user name

Documents include:

Userreg.html (Registration page)
Ajaxreg. JS (Ajax script and real-time verification of JS script)
Checkuserreg. PHP (a page that connects to the database and detects if the user name is registered)
Userreg.html (registration page) copy PHP content to clipboard
PHP Code:



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