Promise.all () works for IE 11

Question

Background: I was tasked with resolving the issue with the following error:

'Promise' is undefined' 

What is part of our sessionmodel.js script:

 return Promise.all(promises); 

promises is an array of actions that should happen, and if any failure is rejected.

Question: Based on my research, IE does not support Promise , so is there any work that can be applied to this return value that will do the same thing?

Answer 1

Since you are using Backbone, promises are probably jQuery promises. You can use the jQuery .when function to do the same as Promise.all :

 return $.when.apply($, promises); 

For most other simple situations, when you call functions like save and fetch , you can completely avoid promises by using the provided callbacks:

 model.save({ context: this, success: this.onModelSuccess }); 

There is no need to use another library because Backbone already uses jQuery (by default) if you don't like jQuery deferred or that you use something else instead of jQuery.

Answer 2

The ES6 Promise specification is implemented by "good" libraries such as Q , When , RSVP , Bluebird , Lie and much more ...

If you want to know more about Promises check out this link: Promises

Answer 3

I recommend you use polyfill .