AJAX username verification_PHP tutorial

[php]

//This file is register.php, on the client User registration //Create ajax engine function getXmlHttpObject(){ var xmlHttpRequest; //Different browsers have different methods of obtaining the XmlHttpRequest object if(window.ActiveXObject){ xmlHttpRequest = new ActiveXObject("Microsoft.XMLHTTP"); }else{ xmlHttpRequest = new XMLHttpRequest(); } } return xmlHttpRequest; } /* function getXmlHttpObject(){ //Different browsers have different methods of obtaining the XmlHttpRequest object var xmlHttp = null; try{ //Firefox, Opera 8.0+, Safari xmlHttp = new XMLHttpRequest(); }catch(e){ //Internet Explorer try{ xmlHttp = new ActiveXObject("Msxml2.XMLHTTP"); }catch(e){ xmlHttp = new ActiveXObject("Microsoft.XMLHTTP"); } } } return xmlHttp; } */ var myXmlHttpRequest = ""; //Verify whether the username exists function checkName(){ //Line 1 myXmlHttpRequest = getXmlHttpObject(); // Is the creation successful? if(myXmlHttpRequest){ //Send a request to a page on the server through the myXmlHttpRequest object //Note: If there is a space between "username" and "=" here, otherwise an error will occur and "username" will not be received on the server side; / var url = "/AjaxTest/registerProcess.php?username=" + $("username1id").value; //window.alert(url); //Open request myXmlHttpRequest.open("get",url,true); //Specify the callback function. process is a function name myXmlHttpRequest.onreadystatechange = process; // actually send the request. If it is a get request, just fill in null //If it is a post request, fill in the actual data //Line 2 myXmlHttpRequest.send(null); } } } //Callback function function process(){ //window.alert("This is the callback function" + myXmlHttpRequest.readyState); //I want to retrieve the data returned from the registerProcess.php page if(myXmlHttpRequest.readyState == 4){ //Line 4 $('myResponse').value = myXmlHttpRequest.responseText; } } } function $(id){ return document.getElementById(id); } Username: & lt; input type = "Button" Onclick = "Checkname ();" Value = "Verify Username" & GT; Password: Email: Username: Password: Email: [php] //This file is registerProcess.php, on the server side //Receive data $username = $_GET["username"]; if($username=="shunping"){ echo "Username not available"; }else{ echo "Username available"; } echo "Username:".$username;//Line 3 ?>

http://www.bkjia.com/PHPjc/477808.html www.bkjia.com true http: //www.bkjia.com/PHPjc/477808.html TechArticle [php] //This file is register.php, on the client html head title user registration/title meta http -equiv = content-type content = text/html;charset=utf-8/ script type = text/javascript //Create...

AJAX username verification_PHP tutorial

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