Execute an expresson when the input field loses focus (onblur):
Definition and Usage
ng-blur directive tells AngularJS what to do when an HTML element loses focus.
ng-blur directive from AngularJS will not override the element's original onblur event,
ng-blur expression and the original onblur event will be executed.
Supported by <a>, <input>, <select>, <textarea>, and the window object.
|expression||An expression to execute when an element loses focus.|