K2 items and categories - select all check box not working. K2 v2.8.0 and Joomla! 2.5.28. Please, Can you help me?

Hello,

Are you getting any errors in your browser's developer tools' console tab?

Yes, I see one jquery conflict. The problem was a System - jQuery Easy plugins, bad configuration in back-end part.
Thank and sorry.

Thank you Tony for letting us know.
Nice to hear that you sorted it out.

I'm having the same issue with a Joomla 3.9.11 and K2 2.9.0

PHP 7.2.22

No errors in the console.

Edit: I can select all in other areas of the Joomla admin panel, it's just the entire K2 component that "Select all" is not working (Items, Tags, Categories, Comments, Extra Fields, Users)

Any ideas?

Thanks!

Tried the K2 v2.10 (dev) version and still same issue - see attached. If it matters some of this site's K2 content was migrated using SP Transfer and the K2 items themselves from K2 CSV import component.

Opening the K2 Settings and just saving them worked! Thank you.

FYI - I fixed it on the live site without updating to K2 v 2.10 (dev)

I'm using 2.9.0 on the live site. Opening and saving worked there.

On my localhost / test site, I updated to 2.10.0 first and no luck until I opened and saved K2 settings...

Also this is really neat - nice feature!

Standard vs. True Toggler - explanation for those who are curious and haven't updated yet:

Choose the standard list toggler (as used in Joomla) where you toggle all rows in a list at the same time to either checked or unchecked. Or use the true list toggler (as used e.g. in Gmail) where you toggle each row's checked state separately. In the latter case, when you have checked for example 2 rows in a list and you click (check) the master list toggler, these 2 rows will be unchecked and all other rows will be checked. Clicking again the master list toggler will revert back the initial 2 rows as checked and all other rows as unchecked.