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Type: Bug
Resolution: Won't Fix
Priority: Minor
Fix Version/s: None
Affects Version/s: 3.5.2
Component/s: Ionic, iOS
Labels:
- partner
- triaged

Testing Instructions:
Hide

Using mobile master site

Navigate to dev testing course > Scorms > ~~MOBILE-2677~~ activity.

Enter the Scorm and navigate to "TEST HERE" section.

Scroll down to the video and play it.

Check video playback stops and subtitles are shown.
Show
Using mobile master site Navigate to dev testing course > Scorms > MOBILE-2677 activity. Enter the Scorm and navigate to "TEST HERE" section. Scroll down to the video and play it. Check video playback stops and subtitles are shown.
Affected Branches:
MOODLE_35_STABLE

The situation
In the Moodle mobile app on iOS video captions are not shown. In the browser and in the Moodle desktop app (macOS) the captions are shown.

Some background
In a client's WBT videos are handled with MediaElement.js http://www.mediaelementjs.com/. In the videos captions are used. The caption files are loaded via AJAX by the MediaElement library.

The reason
Cordova for iOS uses WKWebView to display the content. The Moodle app downloads the content to the device and serves the files locally. Due to iOS CORS restrictions the XHR.status result for local files which are requested via AJAX is always 0 - even if the XHR.responseText holds the correct caption text.

Ionic WKWebView page
https://ionicframework.com/docs/wkwebview/

Support serving local content with WKURLSchemeHandler
Discussion on https://github.com/apache/cordova-ios/issues/415