Retrieve data from an AngularJS scope within Directives

I am facing an issue with accessing a scope variable from the app controller in order to update it on a click event triggered by a custom Directive. It appears that the isolated scope of the Directive is unable to access the global scope.

The scope variable (currentTitle) is defined as follows:

app.controller('news', function($scope, $http, $timeout) {
$scope.promise = $timeout(function() { 
$scope.articles = [{
  title: 'Article 1',
  content: 'It works!'
}, {
  title: 'Article 2',
  content: 'It still works'
}]
}, 3000);

$scope.currentTitle = "my - title";
$scope.showDetails = false;
});

The scope defined within the directive is:

scope: {
  promise: '&?',
  currentTitle: '=?',
  showDetails: '=?bind'
}

Here is a codePen link containing all the code: http://codepen.io/valecarlos/pen/bpmryw

I am attempting to update the header title when one of the titles is clicked. Currently, I am trying to manually update the scope's currentTitle variable and using $apply inside the click event in the directive. However, the updated title is not reflected in the header.

Any assistance would be appreciated!

Answer №1

One way to establish a two-way binding for your directive is by setting the currentTitle key on the scope. This will allow you to easily update the currentTitle in the parent controller from within the directive's scope.

Here's how you can do it:

  scope: {
    ...
    currentTitle: '=',
    ...
  },

When implementing this in your HTML, make sure to include the attribute current-title="currentTitle" within the <accordion> element of your code as shown below:

 <accordion promise="promise" current-title="currentTitle">
            <dt ng-repeat-start="article in articles" ng-class="{'show-titles' : showDetails}">
            <div class="grid-30">
                <div class="round-div"></div>
            </div>
            <div class="grid-70">
                <h5>{{article.title}}</h5>
            </div>

            </dt>
            <dd ng-repeat-end="" ng-class="{'show-titles' : showDetails}">
                <div class="grid-40">
                    <img src={{article.image}} alt="">
                </div>
                <div class="grid-60">
                    <div class="news-desc">
                        <h5>
                            {{article.title}}
                        </h5>
                        <p>
                            {{article.content}}
                        </p>
                    </div>
                </div>
            </dd>
        </accordion>

Answer №2

When utilizing the "&" syntax to pass in a function, you gain the ability to easily invoke it within the directive.

Consider the example where the function residing in the controller is defined as follows:

$scope.someFunction = function(someParameter) {...}

Your directive implementation will then resemble the following structure:

...
    scope {
      someFunction: "&"
   }
...
//within the link function or controller
$scope.someFunction({someParameter:'foo'});

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