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To summarize the special effects learned, get focus event focus, lose focus event blus press a certain key event keypress

[javascript] / JavaScript Document
// Author QQ 496928838 Blog http://wl.125.la
$(document).ready(function(e) {
//Get user text box
var userName=$("#userName");
//Get user password box
var password=$("#password");
//Get the picture in front of the text box
var userimg=$("#userimg");
//Get the picture in front of the password box
var pwimg=$("#pwimg");
       
//Give focus to the user text box
UserName.focus();
       
//Bind user text box focus event, lose focus event, press something event
userName.focus(function(){
userimg.css("background-position","0px");
}).blur(function(){
userimg.css("background-position","-33px");
}).keypress(function(e){
      var key=e.which;
If(key==13){
                   password.focus();
         } 
});
       
//Bind password text box focus event, lose focus event, press something event
Password.focus(function(){
pwimg.css("background-position","-66px");
                                                        }).blur(function(){
pwimg.css("background-position","-99px");
}).keypress(function(e){
      var key=e.which;
If(key==13){
                $("#login").click();
         } 
});

//Bind login button click event, move in event, move out event
$("#login").click(function(){
//Get user name
        var strUsetName = $("#userName").val();
//Get the password entered by the user
          var strPassword = $("#password").val();

      var msg=$("#msg");
                                                                 $.ajax({
​​​​​ url:'admin.php?m=admin&a=login',
           type:'POST',
             dataType:'json',
data:{
                   userName:strUsetName,
Password:strPassword
            },
Success: function(json){
If (json.state=='ok') {
                       msg.html("Login successful");
                                                                                                                                                                                            msg.html(json.error);                                                                                                                                                                                                                                                                                                                                                                      });
}).mousemove(function(){
​​​​ $(this).css("background-position","-138px");
}).mouseout(function(){
​​​​ $(this).css("background-position","0px");
});
                                   
       
});

// JavaScript Document
// Author QQ 496928838 Blog http://wl.125.la

$(document).ready(function(e) {

//Get user text box
var userName=$("#userName");
//Get user password box
var password=$("#password");
//Get the image in front of the text box
var userimg=$("#userimg");
//Get the picture in front of the password box
var pwimg=$("#pwimg");

//Give focus to the user text box
userName.focus();

//Bind user text box focus event, lose focus event, press something event
userName.focus(function(){
userimg.css("background-position","0px");
}).blur(function(){
userimg.css("background-position","-33px");
}).keypress(function(e){
var key=e.which;
if(key==13){
Password.focus();
}
});

//Bind password text box focus event, lose focus event, press something event
password.focus(function(){
pwimg.css("background-position","-66px");

}).blur(function(){
pwimg.css("background-position","-99px");
}).keypress(function(e){
var key=e.which;
if(key==13){
$("#login").click();
}
});

//Bind login button click event, move in event, move out event
$("#login").click(function(){

//Get user name

var strUsetName = $("#userName").val();
//Get the password entered by the user
var strPassword = $("#password").val();

var msg=$("#msg");

$.ajax({

url:'admin.php?m=admin&a=login',
Type:'POST',
dataType:'json',
data:{
UserName:strUsetName,
Password:strPassword
},
Success: function(json){
If (json.state=='ok') {
msg.html("Login successful");
}else{
msg.html(json.error);
}
}
 
});
}).mousemove(function(){
$(this).css("background-position","-138px");
}).mouseout(function(){
$(this).css("background-position","0px");
});


});


Requested ajax method

[php]  public function login() 
{ 
    $json['state']='no'; 
 
    if (!empty($_POST['userName']) && !empty($_POST['password'])) { 
        $userName=$_POST['userName']; 
        $password=md5($_POST['password']); 
        /*var_dumP($_POST);
        var_dump($password);
        var_dump($password);*/ 
         
        if($_SESSION['userData']=$this->db->where("userName='{$userName}' and password='{$password}'")->fine()){ 
 
            $json['state']='ok'; 
        //  echo "<script>window.location.href='admin.php?m=admin&a=admin';</script>";  
            $_SESSION['login']=true; 
             
        }else{ 
 
            $json['error']='用户不存在或密码错误'; 
        } 
 
    }else { 
        $json['error']='请输入用户名和密码'; 
 
    }    
     
    echo json_encode($json); 
    //$this->display();  
} 

  public function login()
  {
   $json['state']='no';

   if (!empty($_POST['userName']) && !empty($_POST['password'])) {
    $userName=$_POST['userName'];
    $password=md5($_POST['password']);
    /*var_dumP($_POST);
    var_dump($password);
    var_dump($password);*/
    
    if($_SESSION['userData']=$this->db->where("userName='{$userName}' and password='{$password}'")->fine()){

     $json['state']='ok';
    // echo "<script>window.location.href='admin.php?m=admin&a=admin';</script>";
     $_SESSION['login']=true;
     
    }else{

     $json['error']='用户不存在或密码错误';
    }

   }else {
    $json['error']='请输入用户名和密码';

   } 
   
   echo json_encode($json);
   //$this->display();
  }

 

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