TypeScript How to access object defined in other class

Question

I have a project that uses Aurelia framework. I want to make global\static object that should be accessed across couple files. But when I try to access it from a different file it says that my object is undefined. Here is what it looks like:

FirstFile.ts

export function showA() {
    console.log("Changed a to " + a);
}
export var a = 3;

export class FirstFile {
    public ModifyA() {
        a = 7;
        showA();
    }

It says that a = 7. Then I use it in other file like this.

SecondFile.ts

import FirstFile = require("src/FirstFile");
export class SecondFile {
    showA_again() {
        FirstFile.showA();
}

I execute showA_again() in my view file called SecondFile.html

<button click.trigger="showA_again()" class="au-target">Button</button>

When I click button, I see in console that variable "a" is still 3. Is there any way to store variables between files?

And where do you call the ModifyA()? I can't see this method being called anywhere. — Buzinas
– Buzinas, Commented Jul 30, 2015 at 15:35

Artiom · Accepted Answer · 2015-08-03 19:24:25Z

1

I'd recommend you to inject FirstFile into SecondFile. Now your code has a smell of bad architecture.

To answer your question: probably you are looking for static (playground sample)

export class FirstFile {

    static showA = function() {
        console.log("Changed a to " + FirstFile.a);
    }

    static a = 3;

    public ModifyA() {
        FirstFile.a = 7;
        FirstFile.showA();
    }
}

export class SecondFile {
    showA_again() {
        FirstFile.showA();
    }
}

edited Aug 3, 2015 at 19:24

answered Jul 30, 2015 at 12:59

Artiom

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3 Comments

Matthew James Davis Over a year ago

Good answer. There are other ways to do this, but I like this one.

Artiom Over a year ago

@MatthewJamesDavis Could you provide an example? It would be great to see other options.

Matthew James Davis Over a year ago

probably not worth it, this is probably the best way

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