Version 0.50.0

This is a major update with some breaking changes. Expect a few more updates like this as we move closer to our 1.0 release in 2018.

General

jQuery 3 is now supported in addition to jQuery 1.9+ and jQuery 2.
⚠️ Unpoly now uses native Promises instead of jQuery deferreds.
You can now help improve Unpoly's documentation by clicking an Edit this page link on any unpoly.com subpage (like [up-follow]).

⚠️ To enable support for Internet Explorer 11 you need to install a Polyfill for Promise. We recommend ES6-promise (2.4 KB gzipped).
Fix a bug where Unpoly would not boot on Safari 9 and 10 if the initial page was loaded with a POST method.

⚠️ Unpoly now uses native XMLHttpRequest instead of jQuery.ajax(). If you have been hacking into Unpoly's networking through jQuery.ajaxPrefilter(), you must now use the up:proxy:load event.
🧩 up.ajax() has been deprecated since its signature is incompatible with native promises. Please use up.request() instead, whose promise fulfills with an up.Response object.
🧩 The up:proxy:received event has been renamed to up:proxy:loaded.
⚠️ The up:proxy:load event properties have changed. You can now access request properties through a key { request }, e.g. event.request.url.
The up:proxy:load event can now be prevented to prevent a request from being sent to the network.
The up:proxy:load event now allows listeners to change request headers by manipulating the event.request.headers object.
A new event up:proxy:fatal will be emitted when an AJAX request encounters fatal error like a timeout or loss of network connectivity.

When a selector was not found in the response, the error notification now offers a link to show the unexpected response.
⚠️ The event up:fragment:destroy can no longer be prevented.

Clicking a link with an [up-restore-scroll] attribute will no longer crash if no previous scroll position for given URL is known (#25)
Fix a bug where going back in history would sometimes not call destructors (#24)

up.observe() no longer sends multiple callbacks when a previous callback was slow to respond.

Fix a bug where tooltips would sometimes stay open when many tooltips are opened and closed concurrently.

When the server signals a redirect with a X-Up-Location header, sending a X-Up-Method header is now optional. If it is missing, GET is assumed.
Unpoly will often update a different selector in case the request fails. This second selector is now sent to the server as a X-Up-Fail-Target header.
You can now configure how CSRF tokens are sent your server-side framework.
⚠️ CSRF tokens are no longer sent for cross-domain requests.

⚠️ up.motion.none() has been removed without replacement. Just pass false or the string 'none' to indicate a animation or transition which has no visual effects and completes instantly.
⚠️ up.motion.finish() is now async. It returns a promise that fulfills when all animations are finished.
⚠️ up.motion.finish() now also finishes animations in ancestors of the given element.

up.follow() will now open a modal if the given link has an [up-modal] attribute
[up-modal] links can now have an [up-fail-target] attribute to indicate which selector to replace for an non-200 response
Fix a bug where preloading an up-modal link would create an invisible .up-modal container in the DOM.

up.follow() will now open a popup if the given link has [up-popup] attribute
up-popup links can now have an up-fail-target attribute to indicate which selector to replace for an non-200 response
Fix a bug where preloading an up-popup link would create an invisible .up-popup container in the DOM.
⚠️ up.popup.attach() now throws an error if neither { url } nor { html } options are given.

⚠️ When async functions emit an event and that event is prevented, the async function now rejects with an Error.
⚠️ When async functions are called wth { confirm: true } and the user denies confirmation, the async function now rejects with an Error.

⚠️ up.util.setTimer() is now always async, even when called with a delay of 0 (zero). The function is now stable.
⚠️ up.util.isHash() has been removed without replacement. In your code you can replace up.util.isHash(x) with up.util.isObject(x) && !up.util.isFunction(x).
⚠️ up.util.resolvedDeferred() has been removed without replacement. Use Promise.resolve() instead.
⚠️ up.util.resolvedPromise() has been removed without replacement. Use Promise.resolve() instead.
⚠️ up.util.rejectedPromise() has been removed without replacement. Use Promise.reject() instead.
⚠️ up.util.unresolvableDeferred() has been removed without replacement. Use new Promise(function() {}) instead.
⚠️ up.motion.when() has been removed without replacement. Use Promise.all() instead.
up.util.isString() now also returns true for String instances (in addition to string literals)
up.util.isNumber() now also returns true for Number instances (in addition to number literals)

New method up.fail_target available in controllers, helpers and views. It returns the selector targeted for a failed response.
New method up.fail_target?(target) available in controllers, helpers and views. It returns whether the given selector is targeted for a failed response.
New method up.any_target?(target) available in controllers, helpers and views. It returns whether the given selector is targeted for a either a successful or failed response.