Getting this.add is undefined when calling outside function

[Babsobar]

Hello,

I'm trying to call a function in another file called createButtons.js; which contains this:
 

function createButtons (){
 

//Create Back to menu Button
    var menuButton = this.add.sprite(width-width+120,height-height+60,'menuButtons','editorb0.png');
        menuButton.setInteractive();
        menuButton.on('pointerdown', function(pointer){
        this.scene.start('MainMenu')
         },this)
        menuButton.setScrollFactor(0);
} 

The function is loaded in my index.html; then I call the function in my main file in the create section simply with "createButtons();".

I get the TypeError: "this.add is undefined" in the console.

Any help is greatly appreciated, I'm sort of a noob in all this but i'm learning

 

[samme]

4 hours ago, Babsobar said:

I call the function in my main file in the create section simply with "createButtons();"

createButtons.call(this);

 

[Babsobar]

2 hours ago, samme said:

createButtons.call(this);

 

Works perfectly, thank you very much.

This is new in phaser 3? I think I remember that in 2 you just called them the classic way