Leveraging a combination of directives in require within AngularJS

I'm facing a situation where I need to access multiple directive controller methods.

Usually, I can access a method from a parent directive using the require attribute like this:

    require:"^parentDirective"

However, I also need to access a method within a separate directive (not a parent). The documentation suggests using an array of strings like this:

    require:["^parentDirective","directiveTwo"] 

Unfortunately, implementing this causes errors even though both directives have been successfully compiled into the DOM.

Am I overlooking something here?

Below is the code for my directive:

    angular.module('testModule', ['parentModule'], function () {
    }).directive('testDirective', function() {
        return {
            restrict: 'AE',
            templateUrl: 'testTemplate.tpl.html',
            scope: {
                value1: "=",
                value2: "="
            },  
            require:['^parentDirective','otherDirective'],
            controller: function($scope,$modal,socketConnection) {

                if(case_x == true){
                    $scope.requiredController_1.ctrl1Func();
                }
                else if(case_x == false){
                    $scope.requiredController_2.ctrl2Func();
                }


            },
            link: function(scope,element,attrs,requiredController_1,requiredController_2){

                scope.requiredController_1 = requiredController_1;
                scope.requiredController_2 = requiredController_2;

            }

        };

    });

Answer №1

Here's a solution that might be what you're looking for:

http://plnkr.co/edit/WO6SROdVFOYlR22JQJPb?p=preview

Consider these insights:

  1. The controller: function () {} is executed on the way down, while the link: function () {} is executed on the way back up after traversing down the DOM tree. So, if your code depends on other controllers, it should be moved from the directive controller to the directive link function.

  2. Directives using require can only require directives in parent elements (using ^) or the current element. Your original HTML had sibling elements, so if they must remain siblings, consider wrapping them all in a fourth directive that they all "require".

  3. When using require: [], an array is passed into the link function, like this:

    link: function(scope, element, attrs, controllers) {
      var parent1 = controllers[0];
      var other = controllers[1];
    }
    

Does that address all of your concerns?

Answer №2

Make sure to include a comma right after the require statement

require:['^parentDirective','otherDirective'], //<--- don't forget this

Check out this demo link demonstrating multiple directive requirements in action

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