Renaming ngModel in an AngularJS directive's "require" attribute can be achieved by specifying a different alias

Question

Renaming ngModel in an AngularJS directive's "require" attribute can be achieved by specifying a different alias

I need help with a basic AngularJS directive:

<my-directive ng-model="name"></my-directive>

I want to change the "ng-model" attribute to "model", but I'm unsure how to pass it to the "require" option in the directive. Here is the full code for the directive:

myApp.directive('myDirective', function($timeout) {
    return {
        restrict: 'E',
        require: 'ngModel',
        link: function(scope, element, attrs, ngModel) {
            ngModel.$render = function() {
                $timeout(function() {
                    ngModel.$setViewValue('StackOverflow');  
                }, 5000);                
            };
        }
    };
});

Here is a fiddle for testing: https://jsfiddle.net/cg2enqj2/1/

Any guidance on how (and if) this modification is possible would be greatly appreciated!

Thank you for your assistance!

javascript angularjs angularjs-directive angular-ngmodel

Answer 1

Answer №1

Are you looking to update the parent controller with your directive? You actually don't need ngModel for this task. The controller is specifically designed to store values for display on the front end and manage operations to retrieve and update them. If you want your directive to update the parent element, it's best to utilize a service or factory.

However, using a service or factory might be considered overkill for simply passing a few values between screen elements. Personally, I prefer having access to my scope from the directives, mainly for reading values, and then letting the controller handle the updating but triggering it from the directive. While this approach may not align with traditional Angular practices, it works effectively for me.

In the provided example, I removed ngModel from your directive and included a button that triggers an update function from a new button added in the directive's template.

https://jsfiddle.net/jimmeyotoole/13kfdq8x/1/

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

myApp.directive('myDirective', function($timeout) {
  return {
    replace: true,
    template : '<div><p> directive value = {{name}}</p> <button ng-click="activate()">Activate!</button><p>example private {{privatevar}}</p>',
    link: function(scope) {
        scope.privatevar="ZZZZ";
    }
   }
  });

myApp.controller('MyCtrl', function($scope, $timeout) {
  $scope.name = 'Superman';
  $scope.activate = function () {
    $scope.name = "I'm no Superman";
  };
});

Answer 2

Are you looking to update the parent controller with your directive? You actually don't need ngModel for this task. The controller is specifically designed to store values for display on the front end and manage operations to retrieve and update them. If you want your directive to update the parent element, it's best to utilize a service or factory.

However, using a service or factory might be considered overkill for simply passing a few values between screen elements. Personally, I prefer having access to my scope from the directives, mainly for reading values, and then letting the controller handle the updating but triggering it from the directive. While this approach may not align with traditional Angular practices, it works effectively for me.

In the provided example, I removed ngModel from your directive and included a button that triggers an update function from a new button added in the directive's template.

https://jsfiddle.net/jimmeyotoole/13kfdq8x/1/

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

myApp.directive('myDirective', function($timeout) {
  return {
    replace: true,
    template : '<div><p> directive value = {{name}}</p> <button ng-click="activate()">Activate!</button><p>example private {{privatevar}}</p>',
    link: function(scope) {
        scope.privatevar="ZZZZ";
    }
   }
  });

myApp.controller('MyCtrl', function($scope, $timeout) {
  $scope.name = 'Superman';
  $scope.activate = function () {
    $scope.name = "I'm no Superman";
  };
});

Answer 3

Answer №2

This situation seems to be a classic case of falling into the XY problem. The usage of ngModel in this code is unnecessary, making the question invalid. Essentially, the inquiry is focused on the wrong aspect.

The correct approach involves establishing communication between the outer scope and the directive by utilizing the directive's attributes. This can easily be achieved without relying on ngModel; instead, employ the scope attribute in the directive configuration object:

scope: {
    model: '='
}

In the linking function of the directive, you can then implement:

$timeout(function () {
    scope.model = 'lol';
}, 1000);

The outcome can be observed here: https://jsfiddle.net/s2f5jbrd/1/

Furthermore, transitioning to AngularJS 1.5 allows for an even cleaner syntax with the utilization of the .component function. By incorporating best practices such as componentization, bindings, controller structuring, and the use of "controller as," the improved version can be previewed here: https://jsfiddle.net/s2f5jbrd/4/

Answer 4

This situation seems to be a classic case of falling into the XY problem. The usage of ngModel in this code is unnecessary, making the question invalid. Essentially, the inquiry is focused on the wrong aspect.

The correct approach involves establishing communication between the outer scope and the directive by utilizing the directive's attributes. This can easily be achieved without relying on ngModel; instead, employ the scope attribute in the directive configuration object:

scope: {
    model: '='
}

In the linking function of the directive, you can then implement:

$timeout(function () {
    scope.model = 'lol';
}, 1000);

The outcome can be observed here: https://jsfiddle.net/s2f5jbrd/1/

Furthermore, transitioning to AngularJS 1.5 allows for an even cleaner syntax with the utilization of the .component function. By incorporating best practices such as componentization, bindings, controller structuring, and the use of "controller as," the improved version can be previewed here: https://jsfiddle.net/s2f5jbrd/4/

Answer 5

Answer №3

Through some investigation, I managed to discover a method for obtaining the ngModel controller of a child element within my directive implementation. Here is an example of another directive where the model uses a custom "ng-model" name as simply "model": https://plnkr.co/edit/UgeYT6tbVpMal7KbPNDC?p=preview

function lgDate($compile, $filter) {
        var directive = {
            restrict: 'E',
            scope: {
                model: "=",
            },
            compile: compile
        };

        return directive;

        function compile(element, attrs) {
            return {
                pre: function (scope, element, attrs) {
                    var template = '<input ng-model="model" ng-keyup="keyup($event.keyCode)" ui-mask="99/99/9999" ' +
                                   'ng-pattern="/(\\d{4}(?!\\d))?([2-9]\\d{3}|1[8-9]\\d{2}|17[6-9]\\d|175[3-9])/" type="text" ';

                    if (element.attr('class')) {
                        template += 'class="' + attrs.class + '" ';
                        element.removeClass(attrs.class);
                    }

                    if (element.attr('name')) {
                        template += 'name="' + attrs.name + '" ';
                        element.removeAttr('name');
                    }

                    if (element.attr('required')) {
                        template += 'required ';
                        element.removeAttr('required');
                    }

                    template += '/>';

                    element.html(template);
                    element.removeClass(attrs.class);

                    $compile(element.contents())(scope);
                },
                post: function (scope, element, attrs) {
                    var ctrl = element.find('input').controller('ngModel');

                    ctrl.$formatters.push(function (data) { // model - view
                        data = $filter('date')(data, 'ddMMyyyy');
                        return data;
                    });

                    ctrl.$parsers.push(function (data) { // view - model
                        var year = data.substr(-4);
                        var month = data.substr(2, 2);
                        var day = data.substr(0, 2);

                        data = (year && month && day) ? year + '-' + month + '-' + day + 'T00:00:00.000Z' : '';
                        return data;
                    });

                    scope.keyup = function (key) {
                        if (key === 68) { // D key
                            scope.model = new Date().toJSON();
                        }
                    };
                }
            }
        }
    }

Answer 6

Through some investigation, I managed to discover a method for obtaining the ngModel controller of a child element within my directive implementation. Here is an example of another directive where the model uses a custom "ng-model" name as simply "model": https://plnkr.co/edit/UgeYT6tbVpMal7KbPNDC?p=preview

function lgDate($compile, $filter) {
        var directive = {
            restrict: 'E',
            scope: {
                model: "=",
            },
            compile: compile
        };

        return directive;

        function compile(element, attrs) {
            return {
                pre: function (scope, element, attrs) {
                    var template = '<input ng-model="model" ng-keyup="keyup($event.keyCode)" ui-mask="99/99/9999" ' +
                                   'ng-pattern="/(\\d{4}(?!\\d))?([2-9]\\d{3}|1[8-9]\\d{2}|17[6-9]\\d|175[3-9])/" type="text" ';

                    if (element.attr('class')) {
                        template += 'class="' + attrs.class + '" ';
                        element.removeClass(attrs.class);
                    }

                    if (element.attr('name')) {
                        template += 'name="' + attrs.name + '" ';
                        element.removeAttr('name');
                    }

                    if (element.attr('required')) {
                        template += 'required ';
                        element.removeAttr('required');
                    }

                    template += '/>';

                    element.html(template);
                    element.removeClass(attrs.class);

                    $compile(element.contents())(scope);
                },
                post: function (scope, element, attrs) {
                    var ctrl = element.find('input').controller('ngModel');

                    ctrl.$formatters.push(function (data) { // model - view
                        data = $filter('date')(data, 'ddMMyyyy');
                        return data;
                    });

                    ctrl.$parsers.push(function (data) { // view - model
                        var year = data.substr(-4);
                        var month = data.substr(2, 2);
                        var day = data.substr(0, 2);

                        data = (year && month && day) ? year + '-' + month + '-' + day + 'T00:00:00.000Z' : '';
                        return data;
                    });

                    scope.keyup = function (key) {
                        if (key === 68) { // D key
                            scope.model = new Date().toJSON();
                        }
                    };
                }
            }
        }
    }

Renaming ngModel in an AngularJS directive's "require" attribute can be achieved by specifying a different alias

Answer №1

Answer №2

Answer №3

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