Troubleshooting a scope problem in Angular 1.2 directive

When you create a directive with an isolated scope, no template within the directive, but there is some dom elements inside the directive, those dom elements cannot bind to the scope of the directive.

<div ng-controller="testCtrl">
    {{hehe}}
    <hr/>
    <div test-directive="hello" >
      Directive Data: 
      <div>{{test}}</div>
    </div>
</div>

angular.module('app',[])
.controller("testCtrl",['$scope', function ($scope) {

  $scope.hehe = "test from controller";

}])
.directive("testDirective",function(){
  return{
    scope: {
      "testDirective": "="
    },
    controller: ['$scope', function ($scope) {

      $scope.test = "test from directive";

    }]
  };
});

Demo

In the demonstration, there are two versions of the Angular library used, 1.1.5 and 1.2.4, and one of them is commented out.

The code functions correctly with version 1.1.5 but not with 1.2.4.

Could someone clarify what is causing this issue?

Answer â„–1

A new feature in version 1.2.x is the enhancement of isolate scopes. These scopes are now truly isolated, allowing binding only from a template within the directive itself (specified by either template: or templateUrl:).

The scope of your directive will not be inherited by the template in your HTML.

The purpose of isolate scopes is to separate the internal workings of the directive from the outer template. The previous implementation did not provide complete isolation and led to increased coupling.

It is advisable to use isolate scope only when utilizing an internal template within the directive. In cases where template: or templateUrl: are not used, it is recommended to employ scope: true or no scope at all.

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