ExtJs 3.0 动态生成 CheckBox

          在开发过程中，往往需要利用数据动态生成Checkbox。如权限节点。考试答案，调查选项等等。在Extjs中，有两种方法来获取后台数据，一是Ext.Ajax()方法，第二种是利用 Store，store其实也是利用ajax方式来获取，下面以利用Store的方式来实现动态生成。

1、定义Store

       //定义store
        var customFieds = new Ext.data.Store({
            url: ‘Controls/GetFields',
            remoteSort: true,
            reader: new Ext.data.JsonReader({
                root: 'data',
                totalProperty: 'total',
                id: 'Id'
            }, [
                { name: 'Id', type: 'string' },
                { name: 'Name', type: 'string' },
                {name: 'FieldType', type: 'string'},
                {name: 'IsChecked', type: 'string'}
            ])
        });

2、生成

/**
         * 生成Checkbox
         *
         */
        function generateCheckbox() {

            //以store动态生成Checkbox
            var items = [];
            for (var i = 0; i < customFieds.getCount(); i++) {
                var d = customFieds.getAt(i);
                var chk = { id: d.get('Id'), boxLabel: d.get('Name'), name: 'LableFields',inputValue:d.get('Id'),checked :d.get('IsChecked')=='true'?true:false };
                items.push(chk);
            }
             

var CheckBoxGroupTypes = new Ext.form.CheckboxGroup({
                xtype: 'checkboxgroup',
                fieldLabel: 'Field<span style="color: red;" >*</span>',
                id: 'Field',
                allowBlank: false,
                name: 'LableFields',
                columns: 3,
                anchor: "95%",
                msgTarget: "side"
            });
            CheckBoxGroupTypes.items = items;
            var singleColumn1 = [
                CheckBoxGroupTypes
            ];


            var form = new Ext.FormPanel({
                border: false,
                waitMsgTarget: true,
                labelWidth: 100,
                frame: true,
                fileUpload: true,
                bodyStyle: 'padding:5px 5px 0',
                labelAlign: 'right',
                items: singleColumn1,
                buttonAlign: 'center',
                buttons: [new Ext.ux.SubmitBtn({
                    text: 'Submit.',
                    handler: function() {
                        if (form.getForm().isValid()) {
                            form.getForm().submit({
                                url:  'Control/SaveOrUpdate',
                                params: {
                                   "Id": id
                                },
                                waitMsg: 'save...',
                                timeout: 2000 * 1000,
                                success: function (form, action) {
                                    if (action.result.success) {
                                        win.destroy();
                                        FieldRuleStore.load({ params: {
                                            start: 0,
                                            limit: ALL_PAGESIZE_SETTING
                                        }
                                        });
                                    }
                                },
                                failure: function (form, action) {
                                    Ext.Msg.show(action.result.msg);

                                }
                            });
                        }
                    }
                }), new Ext.ux.CancelBtn({
                    text: 'Exit',
                    handler: function() {
                        win.destroy();
                    }
                })]
            });
        var win = new Ext.Window({
                id: ‘id',
                title: title,
                iconCls: 'application_form',
                 500,
                resizable: false,
                constrain: true,
                autoHeight: true,
                modal: true,
                closeAction: 'close',
                plain: true,
                items: [form]
            });
            win.show();


           
  }

3、回调生成，回调的原因是因为extjs store获取数据是使用ajax方式获取。回调就是要在获取数据成功后才动态生成。

customFieds.load({
            params: {
                Id:id
            },
            callback: function(r, option, sucess)
            { generateCheckbox(); }
        });

4、效果图