CODEWITHSUNDEEP
javascripterror-handlingpromise
CodeNinja
CodeNinja

Reputation: 1179

Stack Trace Error Handler and Promises Error Handler

I 've Error handler function:

function onError(message, source, lineno, colno, error) { sendRequestToSendMail(arguments) }
window.onerror = onError

I have also async tasks with promises and I want catch exceptions in them. I don't need to repeat yourself like:

doSomething1()
    .then(doSomething2(), onError)
    .then(doSomething3(), onError)
    .then(doSomething4(), onError)

How to implement global error handler for all promises (like window.onError) ?

Upvotes: 0

Views: 52

Answers (1)

robertklep
robertklep

Reputation: 203409

It's not a global error handler (which doesn't sound like a great idea to me tbh), but since errors are propagated through the promise chain, you can shorten your code (and get rid of the repetition) by adding a final .catch() statement to your chain:

doSomething1()
    .then(doSomething2())
    .then(doSomething3())
    .then(doSomething4())
    .catch(onError)

That would catch any rejections thrown by any of the doSomething* functions.

Upvotes: 1

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