Connect the out-of-scope static variable to the HTML in Angular using Typescript

Question

Connect the out-of-scope static variable to the HTML in Angular using Typescript

I recently developed a small test website using typescript and angularjs.

Within my project, there is a module that contains a static variable which I would like to connect to the HTML document in order to display the currently logged-in user.

module mytest.constants {

    export class CurrentSession {

        public static CURRENT_USER: string = "Tobi";

    }
}

The issue at hand is that the current scope resides in a controller that is separate from my CurrentSession class.

I am hoping to achieve something like this:

<div class="label" style="color:green">
  Logged in as: {{mytest.constants.CurrentSession.CURRENT_USER}}
</div>

An alternative approach could involve adding a class member to the controller and setting it within the constructor like so:

this.CurrentUser = mytest.constants.CurrentSession.CURRENT_USER

However, I would prefer to directly bind the static variable to the HTML file. Is this task feasible?

angularjs typescript

Answer 1

Answer №1

In order to bind static properties effectively in Angular, you cannot simply reference them directly as the framework does not check them during its digest cycle. However, you can work around this limitation by creating a scope or 'this' reference to the class itself. One way to achieve this is demonstrated below:

module mytest.constants {

    export class CurrentSession {

        public static CURRENT_USER: string = "Tobi";

        CurrentSession = CurrentSession;

    }
}

This code snippet essentially creates its own property using

this.CurrentSession = CurrentSession

.

When utilizing this approach in your template (assuming you are employing the controllerAs syntax with session referring to the controller instance), you will be able to successfully bind to CURRENT_USER like so:

<div>{{session.CurrentSession.CURRENT_USER}}</div>

Answer 2

In order to bind static properties effectively in Angular, you cannot simply reference them directly as the framework does not check them during its digest cycle. However, you can work around this limitation by creating a scope or 'this' reference to the class itself. One way to achieve this is demonstrated below:

module mytest.constants {

    export class CurrentSession {

        public static CURRENT_USER: string = "Tobi";

        CurrentSession = CurrentSession;

    }
}

This code snippet essentially creates its own property using

this.CurrentSession = CurrentSession

.

When utilizing this approach in your template (assuming you are employing the controllerAs syntax with session referring to the controller instance), you will be able to successfully bind to CURRENT_USER like so:

<div>{{session.CurrentSession.CURRENT_USER}}</div>

Answer 3

Answer №2

Appreciation to dfsq for the prompt response.

I managed to discover an alternate solution that worked well for me.

To begin, I created a variable named "CurrentSession" in my app.ts and initialized it with a new instance of my Object

angular.module("app", [])
    .constant("CurrentSession", new mytest.constants.CurrentSession())

Subsequently, I was able to inject this Constant into my controller as shown below:

export class MainCtrl {

    public static $inject = ["$state", "$http", "CurrentSession"];

    constructor($state, $http, private CurrentSession) {
      ...
    }

An advantage of this approach is that by using "private CurrentSession" it automatically sets a member-variable "CurrentSession".

This is how the html appears:

<button ng-click="main.logOut()">Log out {{main.CurrentSession.CURRENT_USER.Name}}</button>

Answer 4

Appreciation to dfsq for the prompt response.

I managed to discover an alternate solution that worked well for me.

To begin, I created a variable named "CurrentSession" in my app.ts and initialized it with a new instance of my Object

angular.module("app", [])
    .constant("CurrentSession", new mytest.constants.CurrentSession())

Subsequently, I was able to inject this Constant into my controller as shown below:

export class MainCtrl {

    public static $inject = ["$state", "$http", "CurrentSession"];

    constructor($state, $http, private CurrentSession) {
      ...
    }

An advantage of this approach is that by using "private CurrentSession" it automatically sets a member-variable "CurrentSession".

This is how the html appears:

<button ng-click="main.logOut()">Log out {{main.CurrentSession.CURRENT_USER.Name}}</button>

Connect the out-of-scope static variable to the HTML in Angular using Typescript

Answer №1

Answer №2

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