Uncaptured errors in chained jQuery's AJAX calls

[gomezgoiri]

So far, I chain more than one request in some calls.

However, using jQuery API (until version 3.0) causes the problem described here (under section Criticism). That is, if in the following call fn1 fails, the failure function does not capture it (only errors from fn3).

promise.then(fn1).then(fn2).then(fn3, fail);

[gomezgoiri]

Possible solutions:

• Wrap Deferred object
  • get Promise from Deferred object ("jQuery also has a Promise type, but this is just a subset of Deferred and has the same issues.")
• Use a library which implements the ECMAScript 6 promises (e.g., axios).
• Wrap the requests with any of the following libraries.
• Update jQuery version. However, it seems that it is still in alpha and we would lose compatibility with some browsers (e.g., IE<9).

[gomezgoiri]

This issue will remain in this project but it will be fixed in the new Angular-based PTAnywhere-widget version.