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Messages 1 to 6 of 6 total |
Adding a Large Number of Rows to TGrid. |
Wed, Jul 31 2013 6:45 PM | Permanent Link |
Steve Gill | Hi Tim,
I have been playing with adding a lot of data to a TGrid (over 1000 records) and found it was taking a while. So I split the code up to see where the delay was. I used a loop to add 1000 rows using AppendRow and it took 59 seconds. I then added data to these rows and it took about 5 seconds. So the delay is in appending the rows. Is there a fast way to add a bunch of rows to TGrid? It would be nice to have a BeginUpdate and EndUpdate so the grid doesn't display the rows until they have finished being added, but I don't know whether or not that is possible. Yes, 1000 rows is a lot of rows, and yes, I could filter the data first so that only a portion of it is loaded into the grid. I just want to see what is possible before things become unwieldy. Thanks, Steve |
Wed, Jul 31 2013 8:04 PM | Permanent Link |
Rick | On 01/08/13 08:45, Steve Gill wrote:
> > So the delay is in appending the rows. Is there a fast way to add a bunch of rows to TGrid? > > Hi Steve. I also would like TGrid performance improved and asked Tim about it back in May. Tim's response was that an upcoming update will add virtualization support to the grid which should do the job. The thread is here: http://www.elevatesoft.com/forums?action=view&category=ewb&id=ewb_general&msg=2699 -- Rick |
Wed, Jul 31 2013 10:26 PM | Permanent Link |
Steve Gill | Rick wrote:
<< I also would like TGrid performance improved and asked Tim about it back in May. Tim's response was that an upcoming update will add virtualization support to the grid which should do the job. The thread is here: http://www.elevatesoft.com/forums?action=view&category=ewb&id=ewb_general&msg=2699 >> Thanks Rick. Hopefully it's not too far off. -Steve |
Thu, Aug 1 2013 9:09 AM | Permanent Link |
Matthew Jones | Not knowing anything about this, I imagine that the cost is in setting up all the
browser data, not the displayed data. Thus a row will always be costly. The virtual grid, if it re-uses visual elements, would of course improve this. /Matthew Jones/ |
Tue, Aug 6 2013 12:03 PM | Permanent Link |
Tim Young [Elevate Software] Elevate Software, Inc. timyoung@elevatesoft.com | Steve,
<< So the delay is in appending the rows. Is there a fast way to add a bunch of rows to TGrid? >> Not anything that's exposed. I'll have to see about adding the ability to set the row count directly. << It would be nice to have a BeginUpdate and EndUpdate so the grid doesn't display the rows until they have finished being added, but I don't know whether or not that is possible. >> Yes, that's how the framework does it now when it is data-bound. << Yes, 1000 rows is a lot of rows, and yes, I could filter the data first so that only a portion of it is loaded into the grid. I just want to see what is possible before things become unwieldy. >> Actually, 1000 rows isn't a lot for data, but it is for HTML elements in the browser, and that's where the major performance issues are, especially with IE. Tim Young Elevate Software www.elevatesoft.com |
Tue, Aug 6 2013 5:50 PM | Permanent Link |
Steve Gill | Hi Tim,
<< Actually, 1000 rows isn't a lot for data, but it is for HTML elements in the browser, and that's where the major performance issues are, especially with IE. >> Yeah that's what I meant. I am rewriting an existing PHP app with EWB. The previous app generated the HTML and that also took a while with that number of records, although only about half the time of EWB because it was just an HTML table, not a grid. In the meantime, I'm using a TComboBox to filter the grid by the first letter of one of the fields (Company Name), eg. A, B, C, etc. so it's quite fast at the moment. -Steve |
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