promisersvp.jsrsvp-promise

How do I then() on a promise?

I'm using the RSVP.js lib in a browser.

I have one promise applicationReady

I have another promise loadSomeData

I have a final promise, configureUI

Each relies on the previous promise to do it's work. How do I get these three promises to run in series? I'm clearly missing something.

Thanks!

SOLUTION:

Ok, here's the answer:

Does not work:

applicationReady
.then(loadSomeData)
.then(configureUI)

Does work:

applicationReady
.then(function() { return loadSomeData; })
.then(function() { return configureUI; })

There is a difference between a promise and a function that returns a promise. Bummer that then() doesn't figure this out itself. What's the usecase for then(promise) ?

Solution

  • Ok, here's the answer:

    Does not work:

    applicationReady
.then(loadSomeData)  // loadSomeData is a promise
.then(configureUI)   // configureUI is a promise

    Does work:

    applicationReady
.then(function() { return loadSomeData; })
.then(function() { return configureUI; })

    There is a difference between a promise and a function that returns a promise.