docs(components/input-groups): add hint that custom file inputs require js to display the selected file name

[thetric]

As a ng-bootstrap user (Angular + Bootstrap) I was confused that the custom file input component requires Bootstrap's JS to display the file name. ng-bootstrap does not require Bootstrap's JS. Bootstrap's documentation should clarify this.

Repro

• Go to https://getbootstrap.com/docs/4.5/components/input-group/#custom-file-input
• Disable JS via the browser's dev tools
• select a file in an upload dialog
• the original placeholder is still visible

Tested under Arch Linux with Firefox 84.0b4

[XhmikosR]

It does not require Bootstrap's JS; it requires bs-custom-file-input and it's already documented: https://getbootstrap.com/docs/4.5/components/forms/#file-browser

[patrickhlauke]

It does not require Bootstrap's JS; it requires bs-custom-file-input and it's already documented: https://getbootstrap.com/docs/4.5/components/forms/#file-browser

not explicitly on https://getbootstrap.com/docs/4.5/components/input-group/#custom-file-input though, maybe worth adding some small note there? maybe cross-reference to https://getbootstrap.com/docs/4.5/components/forms/#file-browser ?

[XhmikosR]

Feel free to add a note/callout, sure :)

[XhmikosR]

#32457