firebug调试Ext登录框

今天照着例子用firebug调试了一个ext的登录(firebug调试需Ext包的支持)
1.js
Ext.onReady(function(){
Ext.QuickTips.init();

// Create a variable to hold our EXT Form Panel.
// Assign various config options as seen.
var login = new Ext.FormPanel({
labelWidth:80,
url:'login.asp',
frame:true,
title:'Please Login',
defaultType:'textfield',
monitorValid:true,
// Specific attributes for the text fields for username / password.
// The "name" attribute defines the name of variables sent to the server.
items:[{
fieldLabel:'Username',
name:'loginUsername',
allowBlank:false
},{
fieldLabel:'Password',
name:'loginPassword',
inputType:'password',
allowBlank:false
}],

// All the magic happens after the user clicks the button
buttons:[{
text:'Login',
formBind: true,
// Function that fires when user clicks the button
handler:function(){
login.getForm().submit({
method:'POST',
waitTitle:'Connecting',
waitMsg:'Sending data...',

// Functions that fire (success or failure) when the server responds.
// The one that executes is determined by the
// response that comes from login.asp as seen below. The server would
// actually respond with valid JSON,
// something like: response.write "{ success: true}" or
// response.write "{ success: false, errors: { reason: 'Login failed. Try again.' }}"
// depending on the logic contained within your server script.
// If a success occurs, the user is notified with an alert messagebox,
// and when they click "OK", they are redirected to whatever page
// you define as redirect.

success:function(){
Ext.Msg.alert('Status', 'Login Successful!', function(btn, text){
if (btn == 'ok'){
var redirect = 'test.asp';
window.location = redirect;
}
});
},

// Failure function, see comment above re: success and failure.
// You can see here, if login fails, it throws a messagebox
// at the user telling him / her as much.

failure:function(form, action){
if(action.failureType == 'server'){
obj = Ext.util.JSON.decode(action.response.responseText);
Ext.Msg.alert('Login Failed!', obj.errors.reason);
}else{
Ext.Msg.alert('Warning!', 'Authentication server is unreachable : ' + action.response.responseText);
}
login.getForm().reset();
}
});
}
}]
});


// This just creates a window to wrap the login form.
// The login object is passed to the items collection.
var win = new Ext.Window({
layout:'fit',
width:300,
height:150,
closable: false,
resizable: false,
plain: true,
border: false,
items: [login]
});
win.show();
});

2.处理页面testlogin.php(当然可以是action,servlet,jsp页面)
<?php
$loginUsername = isset($_POST["loginUsername"]) ? $_POST["loginUsername"] : "";

if($loginUsername == "f"){
echo "{success: true}";
} else {
echo "{success: false, errors: { reason: 'Login failed. Try again.' }}";
}
?>

3.效果如图