Please ask help on the forums. This repository concerns in first Place Joomla-Core coding. For this Reason closing this Issue, thanks.

Set to "closed" on behalf of @franz-wohlkoenig by The JTracker Application at issues.joomla.org/joomla-cms/20195

@franz-wohlkoenig
Could you please reopen this issue. I can confirm it for current Staging Joomla 3.8.8-dev.

• Create 2 contact categories (Test-Cat-1 and Test-Cat-2).
• Create 2 contacts:

1. Test-Contact-1 with category Test-Cat-1.
2. Test-Contact-2 with category Test-Cat-2.

• Create 2 com_fields fields of type "Mail".

1. Test-Cat-1 field. Select Category: Test-Cat-1.
2. Test-Cat-2 field. Select Category: Test-Cat-2.

• Create 2 menu items of type "single contact":

1. for contact Test-Contact-1.
2. for contact Test-Contact-2.

• Go to frontend and open the menu items.
• In both contact forms are ALL fields visible.

Set to "open" on behalf of @franz-wohlkoenig by The JTracker Application at issues.joomla.org/joomla-cms/20195

reopened as stated above.

Thank you!

Some investigations:
We had this issue already in the past. @laoneo correted it here:
https://github.com/joomla/joomla-cms/pull/16666/files
#16666

In Joomla 3.8.4 these lines were added by @sandewt
https://github.com/joomla/joomla-cms/pull/17743/files
#17743

From the point of logic both fixes look somehow conflictive.

In the meantime, under each field, under Options tab, set Display When Read-Only to No.

In the meantime, under each field, under Options tab, set Display When Read-Only to No.

That my fields are only read-only is just because of my laziness concerning writing testing instructions ;-)
Makes no difference. The issue was also reported in German forum where the fields are editable.

Sorry for pushing but this is a serious bug for some Joomla users!
Could we get here comments please from @laoneo and/or @sandewt
My problem is that I don't understand #17743

I can have a look next week.

Sorry for pushing but this is a serious bug for some Joomla users!

@ReLater very clear instruction.

Tested with: Joomla! 3.8.8-dev Development

File + location: joomla-cms-staging\components\com_contact\views\contact\view.html.php

If you change this code in the rules 75 ...

if (empty($item->catid))
{
	$app->setUserState('com_contact.contact.data', array('catid' => $item->catid));
}

back to one rule

$app->setUserState('com_contact.contact.data', array('catid' => $item->catid));

The result is 1 field, as you wish. See the image.

However, Contact form loses data after postback with error is then an issue (#17743) again.
Honestly, I do not know a solution yet.

Why do you try to set the userState for com_contact.contact.data if catid is empty?

@degobbis
May be not the best argument. Because it worked and the test results were positive.

Set to "closed" on behalf of @franz-wohlkoenig by The JTracker Application at issues.joomla.org/joomla-cms/20195

closed as having Pull Request #20214

@ReLater @sandewt
Please test #20214

Thanks