PHP + Ajax without refreshing new logon and logout

Provides a variety of official and user-released code examples. For code reference, you are welcome to exchange and learn this article uses Ajax to skip New logon and exit, thus improving the user experience.

Refreshing LogonDemo: http://www.sucaihuo.com/js/54.html $ (". Btn"). live ('click', function (){
Var user = $ ("# user"). val ();
Var pass = $ ("# pass"). val ();
If (user = ""){
$ ('

'User.html ("user name cannot be blank! "). AppendTo ('. sub'). fadeOut (2000 );
$ ("# User"). focus ();
Return false;
}
If (pass = ""){
$ ('

'0000.html ("the password cannot be blank! "). AppendTo ('. sub'). fadeOut (2000 );
$ ("# Pass"). focus ();
Return false;
}
$. Ajax ({
Type: "POST ",
Url: "ajax. php? Action = login ",
DataType: "json ",
Data: {"user": user, "pass": pass },
BeforeSend: function (){
$ ('

'). AddClass ("loading" Login .html ("logging on..." Login .css ("color", "#999 ")
. AppendTo ('. sub ');
},
Success: function (json ){
If (json. success = 1 ){
$ ("# Login_form"). remove ();
Var p ="

"+ Json. user +"Congratulations!

You have logged on to this site for "+ json. login_counts +.

The last time I log on to this site was: "+ json. login_time +"

[Exit]

";
$ ("# Login"). append (p );
} Else {
$ ("# Msg"). remove ();
$ ('

'0000.html(json.msg0000.css ("color", "#999"). appendTo ('. sub ')
. FadeOut (2000 );
Return false;
}
}
});
});Program code: Session_start ();
Require_once ('connect. php ');

$ Action = $ _ GET ['action'];
If ($ action = 'login') {// log on
$ User = stripslashes (trim ($ _ POST ['user']);
$ Pass = stripslashes (trim ($ _ POST ['pass']);
If (empty ($ user )){
Echo 'user name cannot be blank ';
Exit;
}
If (empty ($ pass )){
Echo 'password cannot be blank ';
Exit;
}
$ Md5pass = md5 ($ pass); // The password is encrypted using md5.
$ Query = mysql_query ("select * from user where username = '$ user '");

$ Us = is_array ($ row = mysql_fetch_array ($ query ));

$ Ps = $ us? $ Md5pass = $ row ['Password']: FALSE;
If ($ ps ){
$ Counts = $ row ['login _ counts'] + 1;
$ _ SESSION ['user'] = $ row ['username'];
$ _ SESSION ['login _ time'] = $ row ['login _ time'];
$ _ SESSION ['login _ counts'] = $ counts;
$ Ip = get_client_ip (); // obtain the logon IP Address
$ Logintime = mktime ();
$ Rs = mysql_query ("update user set login_time = '$ logintime', login_ip =' $ ip ',
Login_counts = '$ counts '");
If ($ rs ){
$ Arr ['success'] = 1;
$ Arr ['msg '] =' login successful! ';
$ Arr ['user'] =_ _ SESSION ['user'];
$ Arr ['login _ time'] = date ('Y-m-d H: I: s', $ _ SESSION ['login _ time']);
$ Arr ['login _ counts'] = $ _ SESSION ['login _ counts'];
} Else {
$ Arr ['success'] = 0;
$ Arr ['msg '] = 'logon failed ';
}
} Else {
$ Arr ['success'] = 0;
$ Arr ['msg '] = 'user name or Password error! ';
}
Echo json_encode ($ arr); // output json data
}
Elseif ($ action = 'logout') {// exit
Unset ($ _ SESSION );
Session_destroy ();
Echo '1 ';
}This article