Unable to change the value of a variable in a function in AngularJS

Calling all developers for assistance! I am experiencing an issue with updating a value dynamically inside an AngularJS controller that is being passed to an HTML tag. Everything works perfectly when updating the value outside of a function:

var app = angular.module('previewApp', []);

app.controller('previewCtrl', function ($scope) {
  var $ = jQuery;
  var targetValue = 0;
  $scope.w = targetValue;
});

The value is then passed to an HTML span tag:

<span style="width:{{w}}px;height:{{h}}px; background-color: white" class="item-inner">

However, I encounter a problem when trying to update the value dynamically within a function using jQuery. Although the value is updated correctly in the console (console.log('Width ' + targetValue);), it does not reflect in the HTML tag:

function onChangeWidth(event) {
  if (event.which != 8 && event.which != 0 && (event.which < 48 || event.which > 57)) {
    isProcess = false;
  }
  const targetValue = $(this).closest('.gfield').find('input').val();
  // $scope.width = ;
  $scope.w = function () {
    return targetValue;
  };

  $scope.docPPIWidth = ppi * +targetValue;
  console.log('Width ' + targetValue);
  $scope.w = targetValue; //updating w didn't work inside function
}

function onChangeHeight(event) {
  const targetValueH = $(this).closest('.gfield').find('input').val();
  if (event.which != 8 && event.which != 0 && (event.which < 48 || event.which > 57)) {
    var isProcess = false;
  }
  $scope.docPPIHeight = ppi * targetValueH;
  console.log('Height ' + targetValueH);
}
$('.width_check input').on('change click', onChangeWidth);
$('.height_check input').on('change click', onChangeHeight);

Answer №1

One important piece of advice I have for you is to consider the implications of mixing JQuery and AngularJS. If not handled carefully, this can lead to a multitude of bugs that are difficult to manage. It seems like in your situation, Angular may not be informed when an event triggered by JQuery occurs, resulting in the digest loop not being automatically activated. While the following solution may temporarily resolve the issue at hand, it is not considered a best practice:

$scope.w = targetValue;
$scope.$digest();

Once you modify a scope variable, notify Angular to initiate the digest loop in order to refresh the view data by including $scope.$digest(). This function specifically checks the scope data of the current component and its children. If you require a check across the entire application, consider using $rootScope.$digest() (although this can impact performance negatively).

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