Async function as event handler

Questions
1

Hi there,
is it possible to use promises inside events handlers using async await?
I thought it was possiible, but now i’m facing some strange behaviour and i’m not so sure.
This is a snippet of code:

           let b = new BABYLON.GUI.Button.CreateSimpleButton("generalPurpose","Conferma e continua\ncon altri articoli");            
            b.onPointerDownObservable.add((**async** function(){   
                this.currentAlert.dispose();
                this.currentAlert = null;                       
                if(generalPurpFunction!==null){
                    // esegue l'eventuale callback
                    let qta = 0;
                    let um = "-";
                    if(inputBox!==null){
                        qta = parseFloat(inputBox.text);
                        um = data._arum1;
                    }                                 
                    **await** generalPurpFunction(qta,um);
                }
            }).bind(this));

generalPurpFunction is my asyncronous function.
In DOM it could be working, does Babylon works the same?

2

Yup this would work the same but as the observable is not awaiting your returned promise, it will be hard to deal with any timing you d like for generalPurpFunction basically you ll end up in a fire and forget mode.

1 Like
3

Thank you @sebavan,
so should i implement inside my generalPurpFunction some strategy to freeze the scene ( or something similar) to block the user till the work is done?

4

If it needs to be blocked, yes or all the rest will carry on as normal otherwise.

2 Likes