[SOLR-14120] Solr Admin UI breaks when using IE 11

• Type: Bug
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 8.3.1, 9.0
• Fix Version/s: 8.5
• Component/s: Admin UI

Environment

Operation System: Microsoft Windows 10 Enterprise (German)
Version: 10.0.17763 Build 17763

Browser: Internet Explorer 11
Version: 11.864.17763
Update: 11.0.160

• Assignee: Robert Muir
• Reporter: Jakob Furrer
• Created: 19/Dec/19 11:37
• Updated: 24/Mar/20 12:44
• Resolved: 24/Dec/19 19:29

Description

A customer of mine is restricted to use no other browser than Internet Explorer to access the Solr Administration User Interface.
He reported that the website does not display any content in the main area when any button of the menu on the left hand side is clicked.
I can replicate that behavior on my machine.

Symptoms
---------
When the Admin UI is loaded, the menu on the left hand side is visible but no content is ever displayed in the main area.
Any menu item (e.g. "Dashboard", "logging", "Java Properties" etc.) can be clicked but no content appears.
An error with a stacktrace is shown in the JavaScript console.

History
---------
I can confirm, that some month ago the Admin UI worked well under IE.
However, I have not researched with what update of IE the problems exactly started.

Analysis
---------
The displayed stacktrace indicates that Internet Explorer does not support the method "startsWith" (and subsequently, the same is true for the method "includes").
This behavior is documented:
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/startsWith#Browser_compatibility
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/includes#Browser_compatibility
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/includes#Browser_compatibility