angularjsHow can I use AngularJS to detect a keypress event?

To detect a keypress event using AngularJS, you can use the ng-keydown directive. ng-keydown takes an expression to evaluate upon keydown event.

For example, the following code will log the keycode of the pressed key when a key is pressed.

<div ng-app="myApp" ng-controller="myCtrl">
  <input type="text" ng-keydown="keydown($event)">
</div>

<script>
  var app = angular.module('myApp', []);
  app.controller('myCtrl', function($scope) {
    $scope.keydown = function($event){
      console.log($event.keyCode);
    }
  });
</script>

Output example

<keycode>

The code consists of the following parts:

1. <div ng-app="myApp" ng-controller="myCtrl"> - This defines the scope of the AngularJS application.

2. <input type="text" ng-keydown="keydown($event)"> - This defines the directive ng-keydown which takes an expression to evaluate upon keydown event. In this case, the expression is keydown($event).

3. app.controller('myCtrl', function($scope) { - This defines the controller myCtrl which is used to define the scope of the application.

4. $scope.keydown = function($event){ - This defines the function keydown which is used to log the keycode of the pressed key.

5. console.log($event.keyCode); - This logs the keycode of the pressed key.

Helpful links

• AngularJS Documentation - ng-keydown
• w3schools - AngularJS ng-keydown Directive

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