Extjs form 怎么加载后台 传的数据啊！ 急急急！

Question

    var form1 = Ext.create('Ext.form.Panel', {
                id: 'form1',
                frame: true,
                height: 200,
                autoScroll: false,
                //autoWidth:true,
                //  width:document.documentElement.clientWidth,
                bodyPadding: 5,
                fieldDefaults: {
                    labelWidth: 120, //标签宽度 
                    width: 450, //字段宽度   
                    labelAlign: 'left',                    blankText: '不允许为空',
                    //anchor: '50%',
                    margin: '10,0,0,0'
                },
                frame: true,                layout: 'form',
                reader: new Ext.data.JsonReader({ successProperty: 'success', root: 'item' }, 
                                        [{ name: 'quantity_per_year', mapping: 'quantity_per_year', type: 'string' },
                                         { name: 'quantity_per_day', mapping: 'quantity_per_day', type: 'string' },
                                         { name: 'stock', mapping: 'stock', type: 'string' },
                                         { name: 'transit', mapping: 'transit', type: 'string' },
                                         { name: 're', mapping: 're', type: 'string' },
                                        ]),                items: [
                {
                    frame: true,
                    xtype: 'textfield',
                    id: 'quantity_per_year',
                    name: 'quantity_per_year',
                    allowBlank: false, //是否允许为空  
                    fieldLabel: '年加工量（万吨）'
                }, {
                    frame: true,
                    xtype: 'textfield',
                    id: 'quantity_per_day',
                    name: 'quantity_per_day',
                    allowBlank: false, //是否允许为空  
                    fieldLabel: '正常日加工量（吨）'
                }
                ,
                {
                    frame: true,
                    id: 'stock',
                    name: 'stock',
                    xtype: 'textfield',
                    allowBlank: false, //是否允许为空  
                    fieldLabel: '期初库存（吨）'
                }, {
                    frame: true,
                    id: 'transit',
                    name: 'transit',
                    xtype: 'textfield',
                    allowBlank: false, //是否允许为空  
                    fieldLabel: '在途资源（吨）'
                }, {
                    frame: true,
                    xtype: 'textarea',
                    id: 're',
                    name: 're',
                    fieldLabel: '备注'
                }],                bbar: [{
                    text: '保存',
                    iconCls: 'button-save',
                    handler: SaveForm
                }
            , {
                text: '取消',
                iconCls: 'icon-reset',
                handler: ResetForm
            }
            ]            });
form1.form.load({});
后台传的JSON数据 为{"success":true,"item":[{"demand":null,"id":"710ff97d-8432-4433-9579-46e27e60ea49","modify":null,"quantity_per_day":"2222","quantity_per_year":"1111","re":"5555","stock":"3333","time":"2013-01","transit":"4444","unitid":"0","unitname":null}]}
哪出错了，怎么加载不出来呢

Answer 1

你的这个Extjs form是通过什么请求去后台拿得数据？如果你要用后台数据来回填form表单，你可以这么写.
还有一点，组件的id和name属性，不要写成一样。
Ext.namespace(Ext.myform);
Ext.myform.form = function(configData){
   Ext.myform.form.superclass.constructor.call(this,{
      id:configData.id,
      items:[
        {
           xtype:'textfield',
           labelField:'demand',
           value:config.demand
        }
      ]
   })
}
Ext.extend(Ext.myform.form,Ext.Panel(),{});
Ext.onReady(function{
   Ext.Ajax.request({
   url:'',
   success:function(res){
      var jsonObj=Ext.util.JSON.decode(res);
      new Ext.myform.form(jsonObj);
   },
   failure:function(){}
})})

Answer 2

form是不能直接读取数据并进行绑定的，form绑定数据是通过form.loadRecord()这个方法实现的，具体请查API