draw event fires too many times with cascadePanes:true option on SearchPanes

draw event fires too many times with cascadePanes:true option on SearchPanes

RaidekRaidek Posts: 55Questions: 7Answers: 0

Link to test case:
With searchPanes.cascadePanes enabled:
http://live.datatables.net/pedakowe/71/edit

Without searchPanes.cascadePanes enabled:
http://live.datatables.net/rozoxina/1/edit

Description of problem:
draw fires 10 times with searchPanes.cascadePanes enabled when selecting a filter:

and deselected it fires 6 times:

But with searchPanes.cascadePanes disabled it fires only once on select and once on deselect.:
Selected:

Deselected:

This is a problem, because with 57 table rows and only one graph as in the examples that I have given, nothing happens.

But if they are larger tables and more than 2 graphs, it will take a long time to display the graphs, since with cascadePanes:true it will redraw the graphs 10 times...

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Answers

  • RaidekRaidek Posts: 55Questions: 7Answers: 0

    Can someone help me. Sorry for posting with this message, but I usually wait 10 days to post if I don't get a reply.

  • allanallan Posts: 57,703Questions: 1Answers: 9,195 Site admin

    Hi,

    You are correct - when using cascade in SearchPanes, it will do a bunch of redraws since it needs to calculate each level of the panes, and it does that by filtering the table (which in turn is triggering a draw).

    We don't yet have a better mechanism for this - it is something that would be useful though, as it can cause issues such as that which you are seeing.

    For the moment I would suggest using a debounce in your event handler to buffer the draws into a single call to your charting draw.

    Allan

  • RaidekRaidek Posts: 55Questions: 7Answers: 0

    Hi and thanks @allan .
    Ok, that's what I thought. As a suggestion (from the total ignorance of Datatable programming) a new event would be fine, but only to be called with the redraw of the table.

    On the other hand, is there a way to calculate how many times draw will be called based on what filters you have enabled? And how many draw calls are added by the different SearchPanes options.

  • allanallan Posts: 57,703Questions: 1Answers: 9,195 Site admin
    Answer ✓

    No, I'm afraid not. Well, not without going through the SearchPanes algorithm anyway. I reckon a 100mS debounce would be best.

    Allan

  • RaidekRaidek Posts: 55Questions: 7Answers: 0

    Thanks for the quick response @allan .

    I'll try it and depending on what I get, I'll post the code in this thread for the rest of the community.

  • RaidekRaidek Posts: 55Questions: 7Answers: 0

    Is there any news regarding this?

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