The use of local hiddenfield_extjs for Form in Extjs4

Copy code The code is as follows:

Ext.onReady(function(){
Ext.QuickTips. init();
Ext.create("Ext.form.Panel",{
title:'Local hiddenfield instance',
renderTo:'formDemo',
bodyPadding:'5 5 5 5 ',
height:100,
width:270,
frame:true,
defaults:{
labelSeparator : ": ",
labelWidth : 70,
width : 200,
allowBlank: false,
msgTarget : 'side',
labelAlign:'left'
},
items:[{
xtype:'textfield',
name:'name',
fieldLabel:'name',
value:'USPCAT.COM'
},{
xtype:'hiddenfield',
name:'age',
value:'1'
}],
buttons:[{
text:'Submit',
handler:function(){
this.up("form"). getForm().submit({//This refers to the current component (button), up is the previous component (form)
params:{
info:'age is a hidden field'
}
});
}
}]
});
})