AJAX test user uniqueness

xiaoxiao2021-04-05  242

//vu.htm

validator user </ title> <html xmlns = "http://www.w3 .org / 1999 / xhtml "> <head> <script type =" text / javascript "> var http_request = false; function send_request (method, url) {http_request = false; // inital HttpRequestif (window.XMLHttpRequest) {// Mozillahttp_request = new XMLHttpRequest (); if (http_request.overrideMimeType) {// set Mimehttp_request.overrideMimeType ( "text / xml");}} else if (window.ActiveXObject) {// IE Browser, use lasted version</p> <p>Var msxml = ['msxml2.xmlhttp.5.0', 'msxml2.xmlhttp.4.0', 'msxml2.xmlhttp.3.0', 'msxml2.xmlhttp', 'microsoft.xmlhttp']; for (var n = 0; n < Msxml.Length; N ) {http_request = new activeXObject (msxml [n]); http_request.setRequestHeader ('content-type', 'text / html; charSet = GB2312'); // Equivalent to iframe</p> <p>Break;} catch (e) {}} // end} // end in →} // end inTtpRequest</p> <p>if (http_request!) {// Error, Creat object fail window.alert ( "can not create XMLHttpRequest object instance") return false;} http_request.onreadystatechange = processRequest; // get post or head, and asychFlag ?? http_request.open ( Method, URL, TRUE; http_request.send (null);} // end send_request ()</p> <p>function processRequest () {if (http_request.readyState == 4) {if (http_request.status == 200) {document.all [ "message"] innerHTML = http_request.responseText;.}}} // End processRequest ()</p> <p>Function usercheck () {var f = document.form1; var username = f.username.value; if (username == ") {WINDOW.Alert (" The username cannot be empty. "); f.username.foCus );} Else {send_request ('get', 'check.asp? Username =' username);}} </ script> </ head> <body> <form name = "form1"> User Name: <input name = "username" type = "text" id = "username"> <input type = "name =" on "value =" UserCheck () "> </ form> <div ID = "Message"> </ div> </ body> </ html></p> <p>//check.asp</p> <p><% response.charset = "GB2312"%> <% u_name = request ("username") if u_name = "test" theresponse.write (u_name & "has been registered") ELSERESPONSE.WRITE ("Congratulations, your choice account" & U_NAME & "Can register!") 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