After initializing the controller and postLink, ensure to reset the scope variable in the directive

Question

After initializing the controller and postLink, ensure to reset the scope variable in the directive

I have created a basic directive:

angular.module('app').directive('field', function () {
    return {
        restrict: 'E',
        template: '<div ng-click="clickElement()"><input id="{{inputId}}"></div>',
        scope: {
            inputId: '@'
        },
        controller: function ($scope) {

            if (!$scope.inputId) {
                $scope.inputId = 'xyz';
            }

            function logId() {
                console.log($scope.inputId); // 'xyz'
                console.log($scope); //$scope.inputId is undefined here (!!!)
            }

            logId();

            $scope.clickElement = function() {
                //$scope.inputId is also undefined here
            }
        }
    }
});

Then I tried using it without specifying the inputId like this:

<field></field>

When I use the directive, my $scope.inputId turns out to be undefined instead of 'xyz' as expected. Why is this happening? What can be done to ensure 'xyz' is set as default if inputId is not specified in directive usage?

P.S. The same issue occurs within the postLink function.

EDIT:

Plunk: http://plnkr.co/edit/0mpcbrdUdafCMzATmCYZ?p=preview

Temporary workaround (demonstrating the desired behavior): http://plnkr.co/edit/G6gxQhgrteJBeNmR7yTX?p=preview

javascript angularjs angularjs-directive

Answer 1

Answer №1

To streamline your code, consider setting a default attribute within the compile function instead of assigning it to the scope in the controller.

compile: function(element, attrs) {
  if (!attrs.inputId) { attrs.inputId = 'xyz'; }
},

You can eliminate any additional code that sets a default value elsewhere in your project.

Answer 2

To streamline your code, consider setting a default attribute within the compile function instead of assigning it to the scope in the controller.

compile: function(element, attrs) {
  if (!attrs.inputId) { attrs.inputId = 'xyz'; }
},

You can eliminate any additional code that sets a default value elsewhere in your project.

Answer 3

Answer №2

Upon reviewing your code snippet, I recommend avoiding the direct usage of the attribute inputId within the $scope. Instead, utilize properties with the '.' object notation as demonstrated below:

angular.module('app', []).directive('field', function () {
    return {
        restrict: 'E',
        template: '<div ng-click="clickElement()"><input id="{{inputId || formObj.inputId}}"></div>',
        scope: {
            inputId: '@'
        },
        controller: function ($scope) {
            $scope.formObj = {};
            if (!$scope.formObj.inputId) {
                $scope.formObj.inputId = 'abc';
            }

            function logId() {
                console.log($scope.formObj.inputId); // 'abc'
                console.log($scope); //$scope.inputId is undefined here (!!!)
            }

            logId();

            $scope.clickElement = function(){
              console.log($scope.formObj.inputId);
              alert($scope.formObj.inputId);
                //$scope.inputId is undefined here but must be 'abc'
            }
        }
    }
}).controller("ctrl", function(){});

Answer 4

Upon reviewing your code snippet, I recommend avoiding the direct usage of the attribute inputId within the $scope. Instead, utilize properties with the '.' object notation as demonstrated below:

angular.module('app', []).directive('field', function () {
    return {
        restrict: 'E',
        template: '<div ng-click="clickElement()"><input id="{{inputId || formObj.inputId}}"></div>',
        scope: {
            inputId: '@'
        },
        controller: function ($scope) {
            $scope.formObj = {};
            if (!$scope.formObj.inputId) {
                $scope.formObj.inputId = 'abc';
            }

            function logId() {
                console.log($scope.formObj.inputId); // 'abc'
                console.log($scope); //$scope.inputId is undefined here (!!!)
            }

            logId();

            $scope.clickElement = function(){
              console.log($scope.formObj.inputId);
              alert($scope.formObj.inputId);
                //$scope.inputId is undefined here but must be 'abc'
            }
        }
    }
}).controller("ctrl", function(){});

After initializing the controller and postLink, ensure to reset the scope variable in the directive

Answer №1

Answer №2

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