andyhill Posted July 14, 2023 Share Posted July 14, 2023 All of a sudden my UNIGUI Sencha Project Crashes Under Chrome (works with Edge) Disallow sync XHR in page dismissal - Chrome Platform Status (chromestatus.com) Chrome now disallows synchronous XHR during page dismissal when the page is being navigated away from or closed by the user. This involves the following events (when fired on the path of page dismissal): beforeunload, unload, pagehide, and visibilitychange. A temporary opt-out is available via Origin Trial "Allow Sync XHR In Page Dismissal": https://developers.chrome.com/origintrials/#/trials/active Motivation Synchronous XHR is on the deprecation path. It hurts the end user experience. beforeunload and unload are used by third parties and first parties to send analytics data to servers. While this is reasonable, there are no good reasons to use synchronous XHR. Instead SendBeacon, Fetch keep-alive should be used (in addition to sending analytics periodically and on pagevisibility etc.). Page dismissal is also an interesting scenario for the following reasons: 1. It hurts the user experience when the user is trying to leave the page or navigate (up to a max timeout of 1s, which is 2s in practice in chrome) 2. The intention of beforeunload handler is a mechanism for preventing data loss for users, however it is used by third parties as a way to reliably do a bunch of work (including sync xhr), up to the max timeout. Some relevant data in this slide deck. This hurts the end user experience. 3. As part of Page Lifecycle API: we want to experiment with running the beforeunload handler at the time of freezing (to determine risk of data loss) to support proactive tab discarding. And Sync XHR (and large amount of work) is problematic here. For now, enterprise users can use the AllowSyncXHRInPageDismissal policy flag and developers can opt into the AllowSyncXHRInPageDismissal origin trial to allow synchronous XHR requests during page unload. We expect to remove this flag in Chrome 93. No settings have been changed in Chrome - Could someone please advise how to resolve - Thanks Quote Link to comment Share on other sites More sharing options...
Administrators Farshad Mohajeri Posted July 14, 2023 Administrators Share Posted July 14, 2023 This feature is introduced in 2018, but it has not affected uniGUI. I tested and still there are no side effects from this Chrome feature. Can you please explain what you experience in your app? Quote Link to comment Share on other sites More sharing options...
andyhill Posted July 14, 2023 Author Share Posted July 14, 2023 UniGUI App Resets (no debug info catchable) Quote Link to comment Share on other sites More sharing options...
andyhill Posted July 16, 2023 Author Share Posted July 16, 2023 Hoping for answers, need to resolve. Quote Link to comment Share on other sites More sharing options...
Administrators Farshad Mohajeri Posted July 16, 2023 Administrators Share Posted July 16, 2023 On 7/15/2023 at 2:17 AM, andyhill said: UniGUI App Resets (no debug info catchable) It should be something different. Please uncheck option TerminateOnBrowserClose in MainModule. That's the only place that XHR is used while unloading the page. Quote Link to comment Share on other sites More sharing options...
andyhill Posted July 18, 2023 Author Share Posted July 18, 2023 Thanks, will check Quote Link to comment Share on other sites More sharing options...
andyhill Posted July 18, 2023 Author Share Posted July 18, 2023 Set accordingly, still crashes after TUniComboBox selections Quote Link to comment Share on other sites More sharing options...
Administrators Farshad Mohajeri Posted July 19, 2023 Administrators Share Posted July 19, 2023 11 hours ago, andyhill said: Set accordingly, still crashes after TUniComboBox selections Then your issue is irrelevant to Chrome XHR. Quote Link to comment Share on other sites More sharing options...
andyhill Posted July 19, 2023 Author Share Posted July 19, 2023 Understood, but this code ran perfectly for years, now with latest updates (Windows,Chrome,UniGUI) it is crashing ? Quote Link to comment Share on other sites More sharing options...
Administrators Farshad Mohajeri Posted July 19, 2023 Administrators Share Posted July 19, 2023 Please check uniGUI logs. Quote Link to comment Share on other sites More sharing options...
andyhill Posted August 3, 2023 Author Share Posted August 3, 2023 Farshad, I have written this many ways - same crash. What I have just noticed is the contents of the TUniComboBox which only has text line entries by me are displayed in underlined with flyout hint to Link to 3CX something we are not using. How do I stop 3CX CSS from inhabiting my TUniComboBox ? Quote Link to comment Share on other sites More sharing options...
andyhill Posted August 3, 2023 Author Share Posted August 3, 2023 There are over 6516 css files on my PC. Grep searching in every css file fails to show *3cx* Grep searching in every js file fails to show *3cx* Windows itself seems to have been programmed (by 3cx I presume but I have no 3cx on my system) that any 10 digit phone number is to be automatically linked to 3cx Phone Call servers ??? 2019-2020 tries to call 3cx 2019/2020 tries to call 3cx 2019>2020 is not tampered with therefore no crash. Farshad, how do we keep our TUniComboBox contents from being hijacked by Windows ? Quote Link to comment Share on other sites More sharing options...
andyhill Posted August 3, 2023 Author Share Posted August 3, 2023 I have searched my system based on https://www.3cx.com/blog/docs/uninstall-check/ There is no visible trace of 3cx. Quote Link to comment Share on other sites More sharing options...
andyhill Posted August 4, 2023 Author Share Posted August 4, 2023 FOUND IT IN CHROME EXTENSIONS - not sure how it got their - now removed 1 Quote Link to comment Share on other sites More sharing options...
Sherzod Posted August 4, 2023 Share Posted August 4, 2023 Very good. Quote Link to comment Share on other sites More sharing options...
Administrators Farshad Mohajeri Posted August 4, 2023 Administrators Share Posted August 4, 2023 5 hours ago, andyhill said: FOUND IT IN CHROME EXTENSIONS - not sure how it got their - now removed As a future tip when you have strange issues like this one, it is always good to test it on more than one PC or browser. Quote Link to comment Share on other sites More sharing options...
andyhill Posted August 4, 2023 Author Share Posted August 4, 2023 Yes, point learned the hard way Quote Link to comment Share on other sites More sharing options...
andyhill Posted August 4, 2023 Author Share Posted August 4, 2023 Farshad, I did write to you personally about offering a Layout Example but you never responded ? Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.