Not adhering to directive scope when transclusion is used, despite explicit instructions to do so

Trying to use a transcluding directive within another controller, but the inner scope isn't being redefined as expected. Despite trying different methods, I can't seem to figure out what's going wrong.

The simplified code looks like this:

HTML:

<!DOCTYPE html>
<html ng-app="app">
<head>
<script src="http://cdnjs.cloudflare.com/ajax/libs/angular.js/1.2.1/angular.min.js"></script>
</head>
<body ng-controller="MainCtrl">
  <mydirective>

    {{foo}}

  </mydirective>
</body>
</html>

JavaScript:

angular.module('app', [])

.controller('MainCtrl', function($scope) {
  $scope.foo = 'bar';
})
.controller('InDirectiveController', function($scope) {
  $scope.foo = 'baz';
})

.directive('mydirective', function() {
  return {
    restrict: 'EA',
    scope: false,
    template:'<div ng-controller="InDirectiveController">'+
                     '{{foo}} <inside></inside>'+
              '</div>',
    transclude:true,
    link: function(scope, element, attrs, ctrl, transclude) {

      transclude(scope, function(clone, scope) {
        element.find("inside").append(clone);
      });
    }
  };
});

Example here

http://jsbin.com/wuqoqalenu/1/edit?html,js,output

Expected output: "baz baz", but actually getting "baz bar". Unsure how to make the transcluded code use the specific scope set in the controller.

Answer №1

When you do not include replace:true in the directive configuration, the HTML for the directive before compilation looks like this:

<mycustomdirective>
    <div ng-controller="InsideDirectiveController">
        {{variable1}} <span></span>
    </div>
</mycustomdirective>

During compilation, the transcluded content is evaluated against the outer scope (MainCtrl), since the directive scope remains the same. This means that the first {{variable1}} gets its value from "value2" in InsideDirectiveController, while the transcluded content {{variable1}} corresponds to "value1" in MainCtrl.

On the other hand, with replace:true included, the compiled directive HTML transforms into:

<div ng-controller="InsideDirectiveController">
    {{variable1}} <span></span>
</div>

Angular now creates a new scope specifically for the directive by associating it with the DOM node linked to the directive's controller. Consequently, the transclude function now uses InsideDirectiveController's scope, resulting in "value2 value2".

In cases where directives don't create new scopes due to

scope: false

The scope for transclude defaults to the "outside scope", which is the one passed into the link function.

Even when replace: true is set, there isn't an automatic creation of a new scope. However, if your template includes ng-controller, Angular's compilation process involves traversing down the DOM, linking up, and finally executing the directive's link function on the element created by ng-controller, thus utilizing the scope generated by ng-controller instead of the outer scope.

Answer №2

By including replace: true, the issue was miraculously resolved.

Although I can't explain why, it worked like a charm.

An example is shown below

http://jsbin.com/xebibulivo/4/edit

update:

Despite what the angular documentation states, the "replace" parameter is supposedly deprecated and shouldn't impact scope inheritance. Yet, strangely enough, it does. Whether this anomaly is a bug or a feature remains unclear.

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