javascript - Using Ext.js hotkeys to call existing function -

i trying set hotkeys in ext.js project. code below.

_sethotkeys: function(values, button){     var hotkeymap = {             target: document,              binding:[]         };           for(var = 0; < values.length; i++){             if(values[i].hotkey){                 hotkeymap.binding.push({                     key: values[i].hotkey,                      fn: this._handlefillinvaluebuttontoggle(button, true)                 });              }            }         console.log(hotkeymap);          var keymap = new ext.util.keymap(hotkeymap);  }, 

i have function, _handlefillinvaluebuttontoggle called when hot key pressed. result of console.log(hotkeymap) shows fn never being set function, instead undefined:

{     target: document,      binding: [         { fn: undefined, key: "e"},          { fn: undefined, key: "c"},          { fn: undefined, key: "n"},          { fn: undefined, key: "d"},      ] } 

how can call function when hotkey pressed?

instead of calling function directly, call function calls function want, while passing in scope.

hotkeymap.binding.push({     key: values[i].hotkey,      fn: function(){         this._handlefillinvaluebuttontoggle(button, true);     },      scope: });