Extjs ComboBox usage notes

VaR combo = New Ext. form. comboBox ({ID: 'combo _ ', name: 'name', // name is just the name of the drop-down list hiddenname: 'id', // name of the Input submitted to the background, corresponding to the ''id in the following store, you must enter width: 80, store: store, // fill data emptytext: 'select', mode: 'local ', // data mode. Local indicates local data readonly: True, // whether read-only value: '', // default value, which must be set to the value submitted to the background, do not set to show text. Optional. triggeraction: 'All', // display all the following data. You must set properties.  Triggera Ction is all allowblank: false, // null valuefield: 'value', // value, optional displayfield: 'text', // display text, corresponding to the 'text', Editable: false in the following store, // whether to allow the input of forceselection: True, // You must select an option: blanktext: 'select' // If this option is not selected, an error message is displayed.}); var store = new Ext. data. simplestore ({fields: ['id', 'text'], data: [['1', 'octoken'], ['2', 'octoken'], ['3', 'August 11'], ['4', 'August 6'], ['5', 'August 6'], ['6', 'August 6'], ['7', 'August 11'], ['8', 'August 11'], ['9', 'August 11'], ['10 ', 'August 11'], ['11', 'August 11'], ['12', 'August 11']}); it took me half a day to perform various tests when setting the default value. I also referred to other methods on the Internet, but none of them succeeded. I was very depressed and finally found the method: the ID in ComboBox must be set and cannot be the same as the value of hiddenname. getcmp (ID value ). setvalue (value) can achieve the select effect in HTML. Note that the value here represents the number of items in store!