Passing data from parent AngularJS directive to child sub-directive

While working on my Angularjs project, I encountered an issue with directive nesting and passing variables.

To start, I created a directive called 'header':

.directive('header', [function() {
    return {
        restrict: 'E',
        scope: {},
        templateUrl: 'header.tpl.html',
        link: function(scope, elem, attrs) {
            scope.showDescriptions = false;
            scope.expandDescriptions = function() {
                ...
                scope.showDescriptions = !scope.showDescriptions;
            }
        }
    }
}

Within the template of this directive, I used another directive:

<div class="description" votable show-vote="showDescriptions"></div>

This brings us to the 'votable' directive:

.directive('votable', [function() {
    return {
        restrict: 'A',
        scope: {
            showVote: '='
        },
        templateUrl: 'votable.tpl.html',
    }
}

In the votable.html file:

<div class="vote" ng-show="showVote"></div>

Upon running this code, the vote icon is supposed to be hidden initially, but it's visible instead.

Next, there's another element + directive combination:

<div expandable expand="expandDescriptions" ng-show="showDescriptions"></div>

Even though this directive starts off hidden, after expanding, it won't collapse despite toggling the 'showDescriptions' variable.

I am left wondering if there is a specific method required to pass a variable from a directive's scope into the scope of a sub-directive?

Answer №1

When dealing with nested directives, it's important to note that the child directive will have its data bound before the link function of the parent directive is executed. To ensure that a value in the parent scope is available for the proper rendering of the child directive, you should bind it in the preLink section of the parent directive. You can achieve this by adding a compile function that returns your custom preLink function as shown below:

compile: function() {
    return {
        pre: function preLink(scope, elem, attrs) {
            scope.showDescriptions = false;
            scope.expandDescriptions = function() {
                // logic here
            };
            scope.showDescriptions = !scope.showDescriptions;
        }
    };
}

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