Ext Toolbar 动态添加按钮

If the Container is already rendered when add is called, you may need to call doLayout to refresh the view which causes any unrendered child Components to be rendered. This is required so that you can add multiple child components if needed while only refreshing the layout once. For example:

var tb = new Ext.Toolbar();
tb.render(document.body);  // toolbar is rendered
tb.add({text:'Button 1'}); // add multiple items (defaultType for Toolbar is 'button')
tb.add({text:'Button 2'});
tb.doLayout();             // refresh the layout



意思就是动态添加后,需要调用toolbar的doLayout()刷新一下布局