Enhancing HTML input value modifications with Angular's ng-model feature

My ng-model input elements are being updated by non-angularJS functions like jQuery or pure JavaScript DOM APIs. The value on the HTML input changes, but the model scope variable does not update. Is there a way to force Angular to process these updates?

app.js
After a 5-second timeout, the value of 1 is changed to 999. This change is reflected in the HTML, but not in $scope.val.

 angular.module('inputExample', [])
   .controller('ExampleController', ['$scope', '$timeout',function($scope,$timeout) {
     $scope.val = '1';
     $timeout(function(){
       document.getElementById("myid").value = 999;

     },5000)
   }]);

HTML

<form name="testForm" ng-controller="ExampleController">
  <input id="myid" ng-model="val" ng-pattern="/^\d+$/" name="anim" class="my-input"
         aria-describedby="inputDescription" />
         <div>
           {{val}}
         </div>
</form>

I have also included the code in this Plunker example: http://plnkr.co/edit/4OSW2ENIHJPUph9NANVI?p=preview

Answer №1

To update the value to 999 after a certain change in the input without triggering, you can achieve this with AngularJS:

 angular.module('inputExample', [])
   .controller('ExampleController', ['$scope', '$timeout',function($scope,$timeout) {
     $scope.val = '1';
     $timeout(function(){
       $scope.val = 999;

     },5000)
   }]);

You don't need to use document.getElement(s) in Angular. Simply set a new value on $scope.val

For the corrected Plunker version, check out: http://plnkr.co/edit/fWxMeNcJFtQreMKZaB5H?p=preview

Answer №2

Instead of manipulating the DOM element, make changes to the $scope.

$scope.value = 999;

Answer №3

To accomplish this task, you can use the following method:

$timeout(function(){
       document.getElementById("myid").value = 999;
       angular.element(document.getElementById("myid")).triggerHandler('change');
     },5000)

Alternatively, a more efficient approach would be to update the scope directly:

 $timeout(function(){
           angular.element(document.getElementById("myid")).scope().val = 999;
         },5000)

Answer №4

To trigger an update, you have the option to manually adjust the viewValue of the form element.

$timeout(function(){
   var ele = document.getElementById("myid");
   ele.value = 999;

   $scope.testForm.anim.$setViewValue(ele.value);
 },5000);

Check out the latest version on Plunker.

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