Ensure response content is loaded before requestFinish is called. #1377
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Previously the response content was loaded asynchronously within the FetchRequest delegate. Consequently, the requestFinished callback was called prior this finishing. The requestFinished callback triggers the toggling of the busy attribute on <html>/<turbo-frame>/<form>, the triggering of the afterSubmit callback which toggles the disabled state of form submitters, and the the turbo:submit-end event. For clients with high latency, this could result in janky behaviour when the busy/disabled state is removed a noticeable time before the response is loaded and rendered. This change removes this delay by ensuring the response is loaded and available prior to notifying the delegate and continuing execution of the Turbo behaviour.
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Fixed the |
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For anyone that wants this fixed for their app before this gets merged, here is a monkey-patch that gives effectively the same outcome: // Ensure that the responseHTML is loaded before the fetchRequest is declared finished
const originalReceive = Turbo.FetchRequest.prototype.receive
Turbo.FetchRequest.prototype.receive = async function(response) {
let fetchResponse = await originalReceive.call(this, response)
await fetchResponse.responseHTML
return fetchResponse
} |
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@jorgemanrubia is this something you guys would consider merging? let me know if there is any feedback on this |
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Previously the response content was loaded asynchronously within the FetchRequest delegate. Consequently, the requestFinished callback was called prior this finishing. The requestFinished callback triggers the toggling of the busy attribute on
<html>/<turbo-frame>/<form>, the triggering of the afterSubmit callback which toggles the disabled state of form submitters, and the the turbo:submit-end event.For clients with high latency, this could result in janky behaviour when the busy/disabled state is removed a noticeable time before the response is loaded and rendered.
This change removes this delay by ensuring the response is loaded and available prior to notifying the delegate and continuing execution of the Turbo behaviour.
Resolves #766 #884 #1202
Replaces #1039
Note that I explored other solutions, such as having the FetchRequest
awaitthe success handlers, etc. on the delegate. Unfortunately, because of the behaviours tied to therequestFinishedcallback, this needs to be executed before the response is rendered by the other delegate callbacks, so that the various attribute updates on elements are processed before the PageSnapshot is taken for the cache, and before the existing DOM content is replaced as to not affect user callbacks.Ultimately, this solution practically resolves the issues, without impacting any other Turbo timings or behaviour.