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AngularJS 1.8: Strange Behavior with Two-Way Binding and Custom Directives

👀 Views: 96 💬 Answers: 1 📅 Created: 2025-06-16
angularjs directive two-way-binding JavaScript

I am experiencing an issue with two-way data binding in AngularJS 1.8 when using a custom directive. I have a parent scope that has a model bound to an input field, and I'm trying to pass this model to a custom directive to manipulate it. However, changes made in the directive do not reflect back to the parent scope as expected. Here’s a simplified version of my code: ```javascript angular.module('myApp', []) .controller('MainCtrl', function($scope) { $scope.myValue = 'Initial Value'; }) .directive('myDirective', function() { return { restrict: 'E', scope: { value: '=' }, template: '<input type="text" ng-model="value" />', link: function(scope) { // Some logic that modifies scope.value scope.value = 'Modified Value'; } }; }); ``` And in the HTML: ```html <div ng-app="myApp" ng-controller="MainCtrl"> <p>Parent Value: {{myValue}}</p> <my-directive value="myValue"></my-directive> </div> ``` After running this code, I would expect the paragraph to show "Modified Value" after the directive modifies it. However, it still displays "Initial Value". I verified that the directive is being initialized correctly, and the model inside the directive does change, but the parent scope doesn’t update. I tried using `ng-model` directly in the input as shown, and I also tried using `scope.$apply()` inside the directive's `link` function to force a digest cycle, but nothing seems to work. I’m not sure what I’m missing regarding the two-way data binding. Any suggestions or insights into why the parent scope isn’t reflecting the changes made inside the directive would be greatly appreciated! I'm developing on CentOS with Javascript. Is there a simpler solution I'm overlooking?