Simple yet perplexing JavaScript within an Angular directive

In the tutorial, the author explains that each element in the stars array contains an object with a 'filled' value, which is determined as true or false based on the scope.ratingValue received from the DOM.

directive('fundooRating', function () {
  return {
    restrict: 'A',
    template: '<ul class="rating">' +
              '<li ng-repeat="star in stars" class="filled">' +
                  '\u2605' +
              '</li>' +
            '</ul>',
    scope: {
      ratingValue: '='
    },
    link: function (scope, elem, attrs) {
      scope.stars = [];
      for(var i = 0; i < scope.max; i++) {
      scope.stars.push({filled: i < scope.ratingValue});
  }
} 

As someone new to JavaScript, understanding the last line of code can be challenging. The term 'filled' only appears in the CSS file and the provided template, making it difficult to comprehend the boolean value behind it. The syntax may seem confusing at first glance. If you are facing similar difficulties, check out the GitHub code for more insights.

Answer №1

After reviewing the source code, I found that the template includes the following snippet:

'<li ng-repeat="star in stars" ng-class="star" ng-click="toggle($index)">'

According to the documentation on ng-class, when an object is provided to the directive, it iterates through each property and adds the property name as a classname if the value is truthy. For example:

ng-class="{filled:true, bold:false}"
will result in class="filled".

Therefore, this line of code determines the 'filled' status of the star, applying the filled class to only the elements up to the max scope index.

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