Extjs ComboBox get focus, that is, pull-down problem summary

Previously I used this method to do: listeners: {'focus ': {fn: function (e) {e. ontriggerclick () ;}, Buffer: 200 }},

One problem with this method is that when you click the drop-down arrow, the focus and expand events are triggered simultaneously, while ontriggerclick contains expand events, so the expand events are triggered twice, causing a conflict.

The solution is as follows:

, Listeners: {'focal ': {fn: function (e) {e. expand (); this. doquery (this. allquery, true) ;}, Buffer: 200 }},