@farzadtaheri commenting out the localisation string for numbers is not the right approach. The correct solution here will be to add this code:

		var elements = document.querySelectorAll(".field-calendar");

		for (var i = 0; i < elements.length; i++) {
			var element  = elements[i],
			    instance = element._joomlaCalendar;

			if (instance) {
				instance.setAltValue();
			}
		}

In the fields category change event

@dgt41 yes it`s better idea.
I added the lines in this file:

administrator/components/com_fields/helpers/fields.php after line 345.

after this change error not shown again. :)

is that what you mean?

Anyone making this PR?

when i use this lines i get JavaScript error because (element) variable used in other lines. so i change the lines to this for resolve problem:

			var elements = document.querySelectorAll(".field-calendar");

			for (var i = 0; i < elements.length; i++) {
				var calendarfield  = elements[i],
					instance = calendarfield._joomlaCalendar;

				if (instance) {
					instance.setAltValue();
				}
			}

@farzadtaheri yup, that was what I was suggesting

I can confirm, solution working.
I added code after 345 line, but with little change:

var elements = document.querySelectorAll('.field-calendar');
                for (var i = 0; i < elements.length; i++) {
                    var calendarfield  = elements[i],
                        instance = calendarfield._joomlaCalendar;
                    if (instance) {
                        instance.setAltValue();
                    }
                }

can one of you Guys wrote the PR?

I did PR - please look is all OK

I am just pasting here my comments on @ViscountVic PR (which needs to be against Joomla's repo):

I would like to suggest a more decoupled snippet here (right now we are forcing calendar code into Fields and we actually fixing partially the problem, can still be a bug for other javascript dependant fields)
So here is my suggestion:

• remove the added code
• replace

element.form.submit();

with

var button = document.createElement('input');
button.style.display = 'none';
button.type = 'submit';
element.form.appendChild(button).click();

Now a proper submit event is bubbled and the calendar (or any script that needs to do anything before submitting a form) will process the data correctly.

PS Sorry for not suggesting this in the first place but I wasn't sure that this was the actual problem. By the way I tested the code and is working fine

New solution isn't working. I see animated icon without any result.

Please restore back previous solution.

@ViscountVic what exactly is not working?

@dgt41 , hi, i think we can do this with more simple change,
i replace the line

element.form.submit();

with

Joomla.submitform('field.storeform', element.form);

and everything is work.

amazing!!
with this change no need to add this lines even!

var elements = document.querySelectorAll('.field-calendar');
                for (var i = 0; i < elements.length; i++) {
                    var calendarfield  = elements[i],
                        instance = calendarfield._joomlaCalendar;
                    if (instance) {
                        instance.setAltValue();
                    }
               }

so for resolve main issue we just need change one line only (348) and nothing else.

@dgt41 I changed category and page showing updating animate image with white transparent background, but it is not finished, all time this animation, without access for edit article

@farzadtaheri if Joomla.submitform() works then that's a better solution!

@farzadtaheri
Please make a PR vs staging so we can test and get this in for 3.7.3
Add the link to the PR here. Thanks.

Was this resolved?

@brianteeman not yet, the problem change but not resolved! please check new PR #17859.

Set to "closed" on behalf of @franz-wohlkoenig by The JTracker Application at issues.joomla.org/joomla-cms/16628

closed as having Pull Request #17859