Question

181

ES6 Promise.all progress

rated 0 times [ 183] [ 2] / answers: 1 / hits: 23364 / 7 Years ago, mon, february 20, 2017, 12:00:00

I have several promises that I need to resolve before going further.

Promise.all(promises).then((results) => {

  // going further

});

Is there any way I can have the progress of the Promise.all promise?

From the doc, it appears that it is not possible. And this question doesn't answer it either.

So:

Don't you agree that this would be useful? Shouldn't we query for this feature?

How can one implement it manually for now?

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koltonadolfow

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4 Years ago

answered 7 Years ago monetm · Accepted Answer

I've knocked up a little helper function that you can re-use.

Basically pass your promises as normal, and provide a callback to do what you want with the progress..

function allProgress(proms, progress_cb) {

  let d = 0;

  progress_cb(0);

  for (const p of proms) {

    p.then(()=> {    

      d ++;

      progress_cb( (d * 100) / proms.length );

    });

  }

  return Promise.all(proms);

}



function test(ms) {

  return new Promise((resolve) => {

    setTimeout(() => {

       console.log(`Waited ${ms}`);

       resolve();

     }, ms);

  });

}





allProgress([test(1000), test(3000), test(2000), test(3500)],

  (p) => {

     console.log(`% Done = ${p.toFixed(2)}`);

});