Ajax reads input text in real time (PHP)


Client code:

Copy codeThe code is as follows:
<!DOCTYPE html PUBLIC “-//W3C//DTD XHTML 1.0 Transitional//EN” “http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd”>
<html xmlns=”http://www.w3.org/1999/xhtml”>
<meta http-equiv=”Content-Type” content=”text/html; charset=gb2312″ />
< title > Untitled Document < / Title >
<script language=”javascript”>
var xmlHttp;

function createXMLHttpRequest(){
xmlHttp = new ActiveXObject(“microsoft.XMLHTTP”);
else if(window.XMLHttpRequest){
xmlHttp = new XMLHttpRequest();


function sendRequest(){


var name = document.getElementById(“name”).value;
url = “String_check.php?page=”+name;
xmlHttp.onreadystatechange = callback;

function callback(){
if(xmlHttp.readyState == 4){
if(xmlHttp.status == 200){
document. getElementById(“show”). InnerHTML = “the string you entered is:” + xmlhttp responseText;


<p>AJAX test;</p>
<input type=”text” onkeyup=”sendRequest();” />

Server side code:

Copy codeThe code is as follows:
header(‘Content-type: text/html;charset=GB2312’);
$ename = $_GET[“page”];
if ($ename == “”) {
$ename = “please enter:”;
echo ($ename);

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