How to incorporate a variable into an AngularJS expression?

Question

How to incorporate a variable into an AngularJS expression?

As a newcomer to Angular, I have a question about using JS variables in an AngularJS expression. I am unsure if it is even called an expression, but the concept I am trying to convey can be illustrated as follows:

<code>
    <script src= "http://ajax.googleapis.com/ajax/libs/angularjs/1.3.14/angular.min.js"></script>
    <script>
        var number = 10;
    </script>
    <div ng-app="">
        <p>Using my variable: {{ 5 + number}}</p>
    </div>
</code>

Can anyone advise me on achieving this functionality?

javascript angularjs

Answer 1

Answer №1

Global variables or functions cannot be utilized in Angular expressions since they are treated as attributes rather than JavaScript code. The Angular parser, through services like $parse and source code found in this repository, interprets and evaluates these attributes against the scope object of the Angular application. Therefore, anything used in an Angular expression needs to be defined within the corresponding scope object.

Answer 2

Global variables or functions cannot be utilized in Angular expressions since they are treated as attributes rather than JavaScript code. The Angular parser, through services like $parse and source code found in this repository, interprets and evaluates these attributes against the scope object of the Angular application. Therefore, anything used in an Angular expression needs to be defined within the corresponding scope object.

Answer 3

Answer №2

It is not recommended to do that as it will defeat the purpose of Angular entirely and may not function as intended. However, I have created a Plunker for you which demonstrates how a global JavaScript variable can be accessed from within your controller if it was declared before the controller code. Ultimately, it all comes down to using JavaScript effectively.

http://plnkr.co/edit/iPojWk2Gz8qR9tMncndi?p=preview

within HTML

<script>
  var x = 7;
</script>

and within the controller

// in the controller
    $scope.Bar=function(){
      return $scope.Data + x;
    }

Answer 4

It is not recommended to do that as it will defeat the purpose of Angular entirely and may not function as intended. However, I have created a Plunker for you which demonstrates how a global JavaScript variable can be accessed from within your controller if it was declared before the controller code. Ultimately, it all comes down to using JavaScript effectively.

http://plnkr.co/edit/iPojWk2Gz8qR9tMncndi?p=preview

within HTML

<script>
  var x = 7;
</script>

and within the controller

// in the controller
    $scope.Bar=function(){
      return $scope.Data + x;
    }

How to incorporate a variable into an AngularJS expression?

Answer №1

Answer №2

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