ExtJS problems encountered in the use of ComboBox

1. Before calling the Showtriggerbutton and SetValue methods on the ComboBox, the Show method needs to be called by the ComboBox window

2. If the data in the store needs to be dynamically retrieved, it can be obtained by giving Store.reload ({url:url, params:{},callback:function () {}});

3. If you need to read a data from the database and then set the data to the value of the ComboBox and want to display the store's text, be sure to place the SetValue action in the load callback function of the ComboBox's store.

ExtJS problems encountered in the use of ComboBox