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How to trigger extjs combox on click of ENTER and TAB Key

Problem: I have one combobox, want to trigger the combobox on keypress of      ENTER and TAB key

Solution:  Use specialkey listener to handle ENTER and TAB key then you doQuery() method to trigger combobox.

 Version: EXTJS 4.1

Code:

   listeners: {

        specialKey :  function(field,e) {

            if(e.getKey() === e.ENTER || e.getKey() === e.TAB){

             field.doQuery(field.getRawValue(),true,true)

            }

         }

    }