Ajax checks whether the user name is occupied

Copy codeThe Code is as follows:
// Check whether the user name is occupied
Function GetO (){
Var ajax = false;
Try {
Ajax = new ActiveXObject ("Msxml2.XMLHTTP ");
} Catch (e ){
Try {
Ajax = new ActiveXObject ("Microsoft. XMLHTTP ");
} Catch (E ){
Ajax = false;
}
}
If (! Ajax & typeof XMLHttpRequest! = 'Undefined '){
Ajax = new XMLHttpRequest ();
}
Return ajax;
}
Function getResult (serverPage ){
Var ajax = GetO ();
Var sep = (-1 <serverPage. indexOf ("? "))? "&":"? "
Var newurl = serverPage + sep + "__=" + encodeURIComponent (new Date (). toString ());

Ajax. open ("GET", newurl, true );
Ajax. onreadystatechange = function (){
If (ajax. readyState = 4 & ajax. status = 200 ){
If (ajax. responseText = 1 ){
ShowResult (1, "your user name can be registered normally ")
AjaxResult = true;
} Else {
ShowResult (0, "your user name is occupied ")
AjaxResult = false;
}
}
}
Ajax. send (null );

}
Function chkUsername (){
Var sflag; // tag;
Var sErr; // error message;
Sflag = true;

Var re =/^ \ w {2, 20} $ /;
If (! Re. test (document. Form1.UserName. value )){
Sflag = false;
SErr = "the user name can only contain letters, numbers, or underscores ";
}

If (document. Form1.UserName. value. length> 20 | document. Form1.UserName. value. length <2 ){
Sflag = false;
SErr = "username length must be 2 ~ Between 20 characters ";
}
If (document. Form1.UserName. value = ""){
SErr = "username cannot be blank ";
Sflag = false;
}
// Ajax detection returned results
If (! Sflag ){
ShowResult (0, sErr)
} Else {
GetResult ("../MemberCheck. aspx? T = 1 & Name = "+ document. Form1.UserName. value );
}

// Document. getElementById ("spname"). innerHTML = ss;
}
Function ShowResult (tag, str ){
Var obj = document. getElementById ("spname ");
If (tag = 0 ){
Obj. style. border = "1px solid red ";
Obj. style. color = "red ";

} Else {
Obj. style. border = "1px solid green ";
Obj. style. color = "green ";
}
Obj. innerHTML = str;
Obj. style. padding = "1px ";
}
// Obtain the user question value returned by ajax
Function getQuestionData (sPage ){
Var ajax = GetO ();
Var sep = (-1 <sPage. indexOf ("? "))? "&":"? "
Var newurl = sPage + sep + "__=" + encodeURIComponent (new Date (). toString ());

Ajax. open ("GET", newurl, true );
Ajax. onreadystatechange = function (){
If (ajax. readyState = 4 & ajax. status = 200 ){
If (ajax. responseText = ""){
Document. getElementById ("getstate"). innerHTML = "the user does not exist! "
}
Else {
Document. g. Question. value = ajax. responseText;
Document. g. Question. readOnly = true;
Document. getElementById ("getpwdstep1"). style. display = "none ";
Document. getElementById ("getpwdstep2"). style. display = "block ";
Document. getElementById ("getstate"). innerHTML = "";

}
}
}
Ajax. send (null );
}
Function getUserQ (){
// Change the display style of the error span
Document. getElementById ("getstate"). style. padding = "1px 4px ";
If (document. g. UserName. value = ""){
Document. getElementById ("getstate"). innerHTML = "the user name cannot be blank! "
} Else {
Document. getElementById ("getstate"). style. background = "red ";
Document. getElementById ("getstate"). style. color = "white ";
Document. getElementById ("getstate"). innerHTML = "loading data ...";
// Set ajax
GetQuestionData ("../MemberCheck. aspx? T = 2 & gName = "+ document. g. UserName. value );
}
}

Function login (n, p, t)
{
If (t = false ){
Document. getElementById ("pLogin"). style. display = "none ";
Document. getElementById ("LoginInfo"). innerHTML = "logging in for you. Please wait ...";
}
Var request;
If (undefined = request ){
Request = new Request ();
}

If (undefined = request. _ get ){
// Ajax is not supported to obtain data;
If (t = false ){
Document. getElementById ("pLogin"). style. display = "";
Document. getElementById ("LoginInfo"). innerHTML = "data cannot be obtained ";
}
}
Else {
UserName = n;
ToPrev = t;
Request. GetNoCache (loginPath + "LoginCheck. aspx" + "? N = "+ n +" & p = "+ p, loginCheck );
}
}
Function loginCheck (result)
{
If (result. readyState! = ReadyState. Complete)
Return;
// Obtained successfully;
If (result. status = HttpStatus. OK & result. responseText! = "")
{
// Execute the returned statement;
// Alert (result. responseText );
If (result. responseText = '1 ')
{
If (toPrev = false ){
Document. getElementById ("LoginInfo "). innerHTML = '<ul> <li> Welcome' + userName + '</li> <a href = "' + loginPath + 'Member/"> management </> </li> <a href = "'+ loginPath +' Logout. aspx "> exit </a> </li> </ul> ';
}
Else {
If (UrlPrev! = ''){
Document. location. href = UrlPrev;
}
Else {
Document. location. href = loginPath;
}
}
Return;
}
Else
{
If (document. location. href! = "Http: //" + document. location. hostname + loginPath + "Member/Login. aspx ")
Document. location. href = loginPath + "Member/Login. aspx ";
}
}
Else
{
// Failed;
Document. location. href = loginPath + "Member/Login. aspx ";
Return;
}
}
Function checkKey (caputureKey, n, p, t ){
Var key = window. event. keyCode;
If (key = caputureKey ){
Login (n, p, t );
}
}
Function setLoginInfo (bLogin ){
If (bLogin ){
Document. getElementById ("LoginInfo "). innerHTML = '<ul> <li> Welcome' + userName + '</li> <a href = "' + loginPath + 'Member/"> management </> </li> <a href = "'+ loginPath +' Logout. aspx "> exit </a> </li> </ul> ';
}
Else {
}
}
Function gotoUrl (s ){
Window. location. href = loginPath + 'Member/RegUser.html ';
}