ngBackspace is an angularjs library that triggers an expression when the backspace key is pressed.
https://kimsunwook.github.io/ngBackspace
bower install ng-backspace --save
Copy-paste the <script> into your <body>.
<script src=".bower_components/ng-backspace/ngBackspace.js"></script>
or
<script src="https://cdn.rawgit.com/KimSunWook/ngBackspace/v1.1.3/ngBackspace.js"></script>
Make sure you include the module 'ngBackspace' in your application config
angular.module('myApp', [
'ngBackspace',
...
]);
<input
<!-- Invoked when you press the BACKSPACE key -->
ng-backspace="message = 'BACKSPACE is pressed.'"
<!-- Called after duration (ms) after pressing the BACKSPACE key. -->
ng-backspace-after="message = 'BACKSPACE was pressed 1 second ago.'"
<!-- If you do not put object, $backspace and $backspaceed values are stored in scope. -->
ng-backspace-model="model"
<!-- The value of $backspace lasts true and the default value is 700 (ms). -->
ng-backspace-duration="1000"
ng-class="[
<!-- The value of $backspace becomes true on click and turns false after duration (ms). -->
{'backspace_classes':model.$backspace},
<!-- The value of $backspaceed is true when clicked and does not change. -->
{'backspaceed_classes':model.$backspaceed}
]">
Once backspace is pressed
$scope.message === 'backspace pressed' // true
$scope.model.$backspace === true // true
$scope.model.$backspaced === true // true
Easy!