var newcombox = new Ext.form.ComboBox({ store: new Ext.data.JsonStore({ url: comboxUrl, root: 'data', fields: ['activityId', 'activityName'], autoLoad :true, listeners:{ 'load':function(){ newcombox.setValue(1); } } }), displayField: 'activityName', id: 'activityCombox1', valueField: 'activityId', editable: false,
参考资料:http://luacloud.com/2012/extjs-combo-trigger-select-event-solution-using-the-setvalue.html