I have a callback function that gets called by some other object which I can't control. I need to wait until this callback function is called, I don't care by who.
var successFunc = function() {
// do stuff
}
myObject.onSuccess = successFunc;
// hang on until successFunc is called...
I found this hacky workaround, but it sucks:
var completed = false;
var successFunc = () => {
// do stuff
completed = true;
}
myObject.onSuccess = successFunc;
while (!completed) {
sleep(200); // sleeps for 200 ms
}
Create a promise, pass its resolve function as callback to the unknown caller somehow, listen to the promise's resolution:
let callback;
const promise = new Promise(r => callback = r);
promise.then(() => console.log('unknown caller called'));
setTimeout(function unknownCaller() {
console.log('randomly calling back');
callback();
}, Math.random() * 5000);