Specify custom behavior on focus event.
Note: As the
focus event is executed synchronously when calling
input.focus() AngularJS executes the expression using
scope.$evalAsync if the event is fired during an
$apply to ensure a consistent state.
<ng-focus ng-focus="expression"> ... </ng-focus>
<window, input, select, textarea, a ng-focus="expression"> ... </window, input, select, textarea, a>
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