javascript execute function in background

Question

I searched a lot but I did not found an appropriate answer. What I actually want is execute a method which does a lot of matrix computing it takes ca. 5sec. While this method is executed I want to display a simple please wait alert or something like this.

Is this possible with (native) javascript or not cause js is single-threaded?

Can you just show the popup before operation and remove it in the end? — Artem Arkhipov
– Artem Arkhipov, Commented Sep 27, 2017 at 19:22
If you have long-running synchronous computation, you should use Web Workers. — SLaks
– SLaks, Commented Sep 27, 2017 at 19:23
@MohammadAdil setTimeout does not run things in parallel. It merely allows you to queue up some work for later. — Mike Cluck
– Mike Cluck, Commented Sep 27, 2017 at 19:24

Nachshon Schwartz · Accepted Answer · 2017-09-27 19:44:15Z

2

What you want to do is use a webworker. Example:

//main.js
var myWorker = new Worker('worker.js');
myWorker.onmessage = function(e) { // function is called when calc is done
  result = e.data;
  // use result
  hideAlert();
}
myWorker.postMessage(calculationParams); // start calculation
showAlert();


//worker.js
onmessage = function(caluclationParams) { // calculation function
  // calculate
  postMessage(result);
}

answered Sep 27, 2017 at 19:44

Nachshon Schwartz

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