Mastering the usage of AngularJS Directive controllerAs syntax with scope is key to developing

I have included my code below:

// HTML

<body>
  <h1>{{foo.name}}</h1>

  <my-directive></my-directive>
</body>

// Scripts

app.directive('myDirective', function() {
return {
    restrict: 'E',
    replace: true,
    scope: true,  //**********
    template: '<h4>{{foo.name}}</h4>',
    controllerAs: 'foo',
    controller: fooCtrl,
    link: function(scope) {
        console.log(scope);
    }
}
});

var fooCtrl = function() {
    this.name = 'FOO';
}

My Query:

When I utilize the controllerAs syntax and do not set scope: true in myDirective, the controller becomes global and inserts foo.name into Tag. However, when scope is set to true, the controller only applies to myDirective.

Why does this happen? Does a controller inside a directive create a new scope that inherits from the surrounding scope? Why does it apply globally?

UPDATE

Mistakenly, I forget about using isolate scope before, so please disregard my confusion regarding the usage of scope inside directives. After reading the docs again, I now have a clear understanding. Thank you for the answer!

Answer №1

It seems like you have a question about the scope property in Angular Directives. When you refer to 'global', I assume you are talking about $rootScope. According to this informative guide, the scope property works in different ways within a directive:

scope.false

This is the default option, where the directive does not create a new scope but shares the scope with its parent.

scope.true

With this setting, a new scope is created that prototypically inherits from the parent scope.

scope: ‘isolate’

An isolated scope is created which doesn't inherit from the parent scope but can still access it using scope.$parent.

Answer №2

For more information on the directive API, make sure to refer to the official documentation and navigate to the section discussing the scope option. By specifying scope as true, a new isolated scope is generated for the controller to be linked to. If scope is not defined, it defaults to false, causing the directive to inherit the parent's scope. This explains why the controller is connected to the parent scope.

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