Transferring parent elements' attributes to child components using AngularJS 1.3

I am encountering an issue with Angular JS related to two directives that I have implemented.

angular.module('myModule', [])
    .directive('myFirstDirective', function(){
        return {
            link: function (scope, elem, attr) {
                var myAttributeToPass = attr.myFirstDirective;
                scope.myAttr = myAttributeToPass;
            },
            controller: 'MyFirstController'
        }
    })
    .controller('MyFirstController', function($scope){
        this.returnTheParameter = function(){
            return $scope.myAttr;
        }
    })
    .directive('mySecondDirective', function(){
        return {
            require : ['ngModel', '^myFirstDirective'],
            link : function($scope, element, attrs, ctrls) {
                var ngModel = ctrls[0];
                var myFirstCtrl = ctrls[1];

                var theParamOfFirst = myFirstCtrl.returnTheParameter();
            }
        }
    });

I initialize my first value with a string :

<div my-first-directive="foobar"> (... => my second directive is inside) </div>

The issue arises in the life cycle as the returned value is consistently undefined since the controller is invoked before the linking process. When attempting to use an isolated scope like so:

scope: {
    "myProp": "@myFirstDirective"
}

It functions properly, but I prefer not to isolate the scope...

Do you have any suggestions or solutions?

Thank you very much!

Answer №1

The issue stems from the sequence in which the operations are being carried out.

It appears that you will need to arrange things in a specific order. In this case, I recommend checking out this post: How to ensure parent directive runs before child directive? instead of repeating someone else's explanation verbatim.

Essentially, you should consider doing something like this:

    return {
        compile: function(){
          return{
            pre:function (scope, elem, attr) {
              var myAttributeToPass = attr.myFirstDirective;
              scope.myAttr = myAttributeToPass;
          },
            post: angular.noop
          };
        },
        controller: 'MyFirstController'
    };

for your initial directive and for the second one:

    return {
        require : ['^myFirstDirective'],
        compile: function(tElement, tAttrs, transclude){
          return{
            pre: angular.noop,
            post: function($scope, element, attrs, ctrls) {
              var ngModel = attrs.ngModel;
              var theParamOfFirst = ctrls[0].returnTheParameter();
            }
          };
        }
    };

The angular.noop mentioned above is simply a placeholder method that doesn't do anything. For a functional demonstration, check out the plunk I created (http://plnkr.co/edit/ABcdeF1GhIjkl23RStuV?p=preview).

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