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angularjsangularjs-scope
Nagy Ervin
Nagy Ervin

Reputation: 701

AngularJS $scope variable

I have been start learning AngularJS 1.4.7 and I can't understand completely the $scope variables. Is this a variable inside a Angular controller "like" public variables inside a PHP class?

For example:

I have 2 functions function1(), function2() in HomeCtrl.js and a $scope.img = null; variable, and 2 ng-click event in template file to call these functions.

On ng-cick event i call the function1 and set the value of $scope.url to somethig

Thereafter i call the function2 and console.log($.scope.url) it retutn null. Null is the initialized value of this varaiable.

I'v just set the value of $scope.url in function1 and inside function2 value of variabel is null, why?

I have no idea why happening this.

Upvotes: 0

Views: 111

Answers (2)

Yuriy Dyachkov
Yuriy Dyachkov

Reputation: 449

Do you literally call $.scope.url? Then that's a problem, it should be $scope.url, no dot between "$" and "scope".

Scope variables have nothing to do with variables accessibility concept (public/private/protected/etc).

They are those "magic" variables, which can be placed inside templates using expressions, which allows data-binding in Angular, i.e., your html with that "magic" scope variables, gets automatically updated by angular, when you just change their values inside your controller, like in that callback function for ng-click. (Actually it's not that easy, here we come to $watch and $digest, but if you are not writing your custom directives, and not mixing, for example, jQuery code with Angular code, you may not think about it for now).

Two-side data-binding, automatic html updates - that's the main point of $scope and $scope variables.

Scope is not and instance of a controller, they are different Angular entities.

Upvotes: 0

Anik Islam Abhi
Anik Islam Abhi

Reputation: 25352

scope is instance of controller.

When you declare a controller , scope will be avaiable there.

You can access scope through out that controller.

That's why when you change on place in a controller , change will be reflect everywhere in that scope.

Upvotes: 1

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