What is the best way to connect a directive's attribute to a dropdown menu in Angular.js?

Question

What is the best way to connect a directive's attribute to a dropdown menu in Angular.js?

Within a dropdown, I have a selection of templates that are connected to $scope.templates:

[{"id":1, "name":"Test 1",{"id":2, "name":"Test 2"}]

.

Furthermore, there is a directive in place,

<editor data-template="1"></editor>

The goal is to re-render the directive with the appropriate template based on the selection made in the dropdown. Is this feasible? So far, my experience has only involved simple one-to-one databinding between fields and divs, without triggering a complete re-render of a directive. What would be the most effective approach for handling this scenario?

Update: Moving beyond the directive's $scope, there is also the challenge of cross-controller two-way binding. For instance, I am struggling with maintaining consistency of a service object across multiple Controllers. Ideally, changes made in one controller should be reflected in the other controller and vice versa. http://jsfiddle.net/9gSVn/1/

javascript angularjs

Answer 1

Answer №1

If you're looking for a method to dynamically replace HTML content based on changes in scope value, one approach is to create a directive. A helpful resource detailing the steps involved in creating such a directive can be found in this informative blog post.

For a practical demonstration, you can check out this sample fiddle featuring a directive that monitors model alterations:

module.directive('template', function () {
    var getTemplate = function (id) {
        var template = '<div>no template for ' + id + '</div>';

        switch (id) {
            case 1:
                template = '<div>template 1 from directive</div>';
                break;
            case 2:
                template = '<div>template 2 also from directive</div>';
                break;
        }

        return template;
    }
    return {
        restrict: 'E',
        replace: true,
        scope: { id: '=templateId' },
        link: function (scope, element, attrs) {
            scope.$watch('id', function (newValue, oldValue) {
                element.html(getTemplate(newValue));
            });
        }
    };
});

Answer 2

If you're looking for a method to dynamically replace HTML content based on changes in scope value, one approach is to create a directive. A helpful resource detailing the steps involved in creating such a directive can be found in this informative blog post.

For a practical demonstration, you can check out this sample fiddle featuring a directive that monitors model alterations:

module.directive('template', function () {
    var getTemplate = function (id) {
        var template = '<div>no template for ' + id + '</div>';

        switch (id) {
            case 1:
                template = '<div>template 1 from directive</div>';
                break;
            case 2:
                template = '<div>template 2 also from directive</div>';
                break;
        }

        return template;
    }
    return {
        restrict: 'E',
        replace: true,
        scope: { id: '=templateId' },
        link: function (scope, element, attrs) {
            scope.$watch('id', function (newValue, oldValue) {
                element.html(getTemplate(newValue));
            });
        }
    };
});

What is the best way to connect a directive's attribute to a dropdown menu in Angular.js?

Answer №1

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