Problems with FixedHeader 3.2.x vs 3.1.9

Nick Hope

I am finding 2 problems with FixedHeader 3.2.x compared to 3.1.9.

RESPONSIVENESS

FixedHeader 3.2.1 or later is slower to react than 3.1.9, which is snappier. 3 comparative examples:

https://fplform.com/Fixed-Header-3pt1pt9.php
https://fplform.com/Fixed-Header-3pt2pt1.php
https://fplform.com/Fixed-Header-3pt2pt3.php

ROWS JUMP WHEN SELECTED

With FixedHeader 3.2.2 or later, with the Select plugin, my rows are jumping downwards significantly when selected or de-selected. With 3.2.1 or earlier, I only occasionally see a small jump upwards. 2 comparative examples:

https://fplform.com/SearchPanes-1pt4-FixedHeader-3pt2pt1.php
https://fplform.com/SearchPanes-2pt0pt1-FixedHeader-3pt2pt3.php

(Note that the searchPanes versions are different to illustrate a separate problem, but don't affect the FixedHeader issue.)

rf1234

Same here! Thanks for sharing. I thought this had been resolved though.
@allan can you help us out on this one please?

Nick Hope

The "jump down" on select is still happening with the current nightlies of dataTables, fixedHeader and Select.

allan

Interesting. I believe it is caused by the call to table.columns.adjust(); in sumRowsClick. I will dig into this and let you know what I find.

One thing - when I load the page it is loading 24MB of data which is why it is so slow initially. I don't think your server is sending a gzip response (I might be wrong - the Chrome header statements aren't 100% clear on that). It would be worth checking that and if not enabled, add that. It will make a big difference to that initial load time if it isn't enabled yet.

Beyond that, you might consider using Scroller with server-side processing (assuming you want that same scrolling grid - paging is far more performant).

Allan

allan

I've made a change to FixedHeader to fix the jumping around issue - thanks for all the test cases!

I do see the performance issue on your pages - I suspect the more complex nature of your table is why it is so much slower than what I am seeing in my own examples. That is something I'll need to circle back to look at.

Allan

Nick Hope

Thank you @allan. Your link gives a 404 error and I can't find a commit, but I can confirm that the "jump down" issue is fixed with the current nightly build of fixedHeader.

You were right that compression was not enabled for my site. I just enabled DEFLATE compression using the Website Optimize feature of cPanel and it seems to have helped. This test confirmed that it was not set up before and is now.

I will look into server-side processing and Scroller.

allan

Oops - forgot to push it to GitHub. It is there now.

Good to hear that gzipping the content helped!

Allan