Is there a way for me to retrieve the element that is linked to the ng-disabled attribute?

Question

Is there a way for me to retrieve the element that is linked to the ng-disabled attribute?

Is there a way to access the element with the ng-disabled attribute inside the function without passing it as a parameter?

Here is the HTML element:

<input class="needsDisabling" ng-disabled="isFieldDisabled()" type="text">

The isFieldDisabled function in controller:

What is the method to access the element with the ng-disabled attribute within this function?

$scope.isFieldDisabled = function () {
        // What can I do to access the element with the ng-disabled attribute here? 

        // if (element has class "needsDisabling")
        // return true;
}

I am seeking an alternative approach to passing the element as a parameter in the function.

JSFiddle

javascript angularjs

Answer 1

Answer №1

In order to maintain good coding practices in AngularJS, it is recommended to use ngDisabled with your model instead of manually manipulating DOM elements in controllers (#2). However, if necessary, you can still create a custom directive to handle the disabled property manually (#1):

angular.module('myApp',[])
.directive('myDisabled', [function () {
        var myDisabled = {
            restrict: 'A',
            scope: false,
            link : function(scope, element, attrs, ngModelCtrl){
                scope.$watch(function() {
                    return scope.$eval(attrs.myDisabled).apply(scope, element);
                }, function(val) {
                    element.prop('disabled', val);
                });
            }
        }
        return myDisabled;
}])
.controller('MyCtrl', ['$scope', function MyCtrl($scope) {

    $scope.isFieldDisabled = function (element) {
      return angular.element(element).hasClass('disabled');
    }
    
    $scope.inputs = [{}, { disabled: true }, {}];
    
    $scope.isInputDisabled = function (input){
      return !!input.disabled;
    };
    
}]);

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="https://code.angularjs.org/1.6.4/angular.js" ></script>
<div ng-app="myApp">
  <div ng-controller="MyCtrl">
    <h2>#1</h2>
    <input class="needsDisabling disabled" my-disabled="isFieldDisabled" type="text"/>
    <input class="needsDisabling" my-disabled="isFieldDisabled" type="text"/>
    <input class="needsDisabling disabled" my-disabled="isFieldDisabled" type="text"/>
    <h2>#2</h2>
    <div>
      <input type="text" ng-repeat="input in inputs" ng-disabled="isInputDisabled(input)" ng-model="input.value"/>
    </div>
  </div>
</div>

Answer 2

In order to maintain good coding practices in AngularJS, it is recommended to use ngDisabled with your model instead of manually manipulating DOM elements in controllers (#2). However, if necessary, you can still create a custom directive to handle the disabled property manually (#1):

angular.module('myApp',[])
.directive('myDisabled', [function () {
        var myDisabled = {
            restrict: 'A',
            scope: false,
            link : function(scope, element, attrs, ngModelCtrl){
                scope.$watch(function() {
                    return scope.$eval(attrs.myDisabled).apply(scope, element);
                }, function(val) {
                    element.prop('disabled', val);
                });
            }
        }
        return myDisabled;
}])
.controller('MyCtrl', ['$scope', function MyCtrl($scope) {

    $scope.isFieldDisabled = function (element) {
      return angular.element(element).hasClass('disabled');
    }
    
    $scope.inputs = [{}, { disabled: true }, {}];
    
    $scope.isInputDisabled = function (input){
      return !!input.disabled;
    };
    
}]);

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="https://code.angularjs.org/1.6.4/angular.js" ></script>
<div ng-app="myApp">
  <div ng-controller="MyCtrl">
    <h2>#1</h2>
    <input class="needsDisabling disabled" my-disabled="isFieldDisabled" type="text"/>
    <input class="needsDisabling" my-disabled="isFieldDisabled" type="text"/>
    <input class="needsDisabling disabled" my-disabled="isFieldDisabled" type="text"/>
    <h2>#2</h2>
    <div>
      <input type="text" ng-repeat="input in inputs" ng-disabled="isInputDisabled(input)" ng-model="input.value"/>
    </div>
  </div>
</div>

Answer 3

Answer №2

In AngularJS, passing the element to the controller's function is not possible. However, you can make use of the ng-class directive to handle both your class and disabled values based on each other.

ng-class="{needsDisabling: isDisabled}" ng-disabled="isDisabled"

There is no reason why you shouldn't approach it this way because;

If the class isn't dynamic, then using disabled="disabled" would suffice without needing ng-disabled.
If the class value is dynamically changing outside Angular's scope, then that aspect needs to be addressed and rectified.

Furthermore, creating a custom directive in AngularJS itself could provide another solution to tackle this issue, as suggested by someone here.

Answer 4

In AngularJS, passing the element to the controller's function is not possible. However, you can make use of the ng-class directive to handle both your class and disabled values based on each other.

ng-class="{needsDisabling: isDisabled}" ng-disabled="isDisabled"

There is no reason why you shouldn't approach it this way because;

If the class isn't dynamic, then using disabled="disabled" would suffice without needing ng-disabled.
If the class value is dynamically changing outside Angular's scope, then that aspect needs to be addressed and rectified.

Furthermore, creating a custom directive in AngularJS itself could provide another solution to tackle this issue, as suggested by someone here.

Is there a way for me to retrieve the element that is linked to the ng-disabled attribute?

Answer №1

Answer №2

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