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Uncaught TypeError: Cannot read properties of undefined (reading 'mData')

Checkout this thread.

I don't believe FixedHeader supports complex headers. See this thread. See if it works better without the top header row.

This looks like an example of your category column:

The RowGroup docs state this:

I'm using a colorpicker in my datatable, with this plugin, where I follow every step given : https://datatables.net/forums/discussion/comment/99979/#Comment_99979

I'm not an Editor expert but having the wrong selected option has been discussed a lot on this forum. Maybe this thread or this thread will help.

You can use a classname to distinguish between the th that have text inputs versus select inputs. See this example from this thread.

A better option might be to add the third row in initComplete or if you are using headerCallback do something like this example from this thread to add the third header.

I would look at using the Child row details functionality. This example, using the return $('......').toArray(); technique from this thread shows how you can open the child row and display the same d…

That'll be the fonts - see this thread, as it's discussing that,

@Vanq Yep, columns.width is the way to go - there's discussion about it on this thread.

Here is one of a few threads discussing this. Sounds like the answer is no.

The jQuery animate() example shown at the end of the thread I linked needs to have the selector changed to the Datatable instead of the page. It does work, see this example:

Funny a similar question was asked yesterday. See if the linked thread helps.

See if Allan's answer in this thread helps.

Here is one of a few threads discussing this. Sounds like the answer is no.

Unsure if it's related to this one https://datatables.net/forums/discussion/comment/195457/#Comment_195457

See Allan's answer in this thread. Basically you need to use this:

Did you read through the thread I linked to? Your server script will need to provide the search options. Most everything you need is provided in the thread.