Specify custom behavior on keydown event.
<ANY
  ng-keydown="expression">
...
</ANY>
      | Param | Type | Details | 
|---|---|---|
| ngKeydown | expression | 
         Expression to evaluate upon
keydown. (Event object is available as   | 
    
<input ng-keydown="count = count + 1" ng-init="count=0">
key down count: {{count}}