I can not reproduce your issue. Perhaps some screenshots can help us???

I've tested with current Joomla 3.9.16-beta. Or are you talking about Joomla 3.10?

What I've tried:

• All inside Joomla backend.
• I activated Debug Mode to load cms-uncompressed.js in backend.
• I created a custom field of type Textarea for Articles.
• I entered multiple lines in field "Default Value". I don't know where else???
• And I don't see errors in JS browser console or elsewhere when I save the field.
• I don't see errors in JS browser console or elsewhere when I save an article with several lines in this textarea field.

Hi I try to give you a full report.
My issue born in a new component view, I've a custom field that create a children formfield for subform standard field, my subclass create a subform with some standard custom fields.
It work correctly but when I fill a textarea with 2 lines of code it break the js.
Now I've reproduce the same situation with a subform "statical" with standard fields only
(I place the XML for view attached to this comment, you can use everywhere instead of component view xml into this zip file form.zip

I can not reproduce your issue. Perhaps some screenshots can help us???

This is the rendering of view when you place 1 line text on textarea

It will be loaded correcty, but if you place 2 lines text on textarea

And save

The form "break" on Javascript.
On firefox debug console:

Using my fix form will reload correctly

If i can add some info write me back.

Thanks

I can not reproduce your issue. Perhaps some screenshots can help us???

I've tested with current Joomla 3.9.16-beta. Or are you talking about Joomla 3.10?

What I've tried:

• All inside Joomla backend.
• I activated Debug Mode to load cms-uncompressed.js in backend.
• I created a custom field of type Textarea for Articles.
• I entered multiple lines in field "Default Value". I don't know where else???
• And I don't see errors in JS browser console or elsewhere when I save the field.
• I don't see errors in JS browser console or elsewhere when I save an article with several lines in this textarea field.

Did you see my last replay with details, can I tell you anything more?

Doers it mean that the issue appears only with your custom component?

Doers it mean that the issue appears only with your custom component?

I find a issue, on my component, I dont know if someone do the same thing, find the same problem.
when I made my code call the function and fail... I dont know anything else.

TY for your time, I stop to develop joomla related software 2 years ago.

no problem will close here as the issue could not be reproduced.