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Item Type: NewsGroup Date Entered: 6/7/2004 1:57:41 PM Date Modified: Subscribers: 0 Subscribe Alert
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sieggy
Asp.Net User
Setting check box state in custom datagrid6/7/2004 1:57:41 PM

0/0

I have a custom extension of the datagrid that I have been building. The data grid includes a check box column (checking the column does not immediately post pack, the user can select a button to initiate that). I'm trying to get the boxes that were selected but I'm not sure how I can do this. Any suggestions would be appreciated.

Thanks,

Sieg
sieggy
Asp.Net User
Re: Setting check box state in custom datagrid6/7/2004 2:57:43 PM

0/0

Some additional information but my trying to figure this out. The grid I'm building uses custom Template Columns, built programatically and the grid itself exists as a member of a composite control. On the post back the composite c'str is called immediately, followed by CreateChildControls. So I have no choice but to rebuild the grid and add them. No "value" in the composite is set when I put a breakpoint in the c'str before I reallocate the grid. I had a simplier issue (TextBox in a composite) and implemented INamingContainer solved the issue. The basic question is how do I get information from client side changes to register themselves with my controls on postback? Is there additional work or code that I have to do. I've seen examples reading values from a normal datagrid with a template column (using checkboxes) and they simply walk through the grid's items, of which I have none on postback.

Thx again,

Sieg
AndrewSeven
Asp.Net User
Re: Setting check box state in custom datagrid6/7/2004 3:22:09 PM

0/0

How about using the checked changed event.
sieggy
Asp.Net User
Re: Setting check box state in custom datagrid6/7/2004 3:54:49 PM

0/0

My final grid needs to have support for about 25 items per page. Doing a server post for each check click would be too slow for the user. I know the state can be posted back (I've seen examples similiar to what I'm doing relying on such techniques). I'm guessing that perhaps it is a naming problem. Trying a much simplier example with a small composite control to see if can nail down the error.

sieggy
Asp.Net User
Re: Setting check box state in custom datagrid6/7/2004 6:38:12 PM

0/0

After considerably more debugging the problem seems to stem from when CreateChildControls is called for a Composite Control. For a regular page call it is called after Page_Load and all your expected db calls, page construction code, etc. On a post back, CreateChildControls is called BEFORE Page_Load. Handlers so such things as buttons or paging links are called after both CreateChildControls and Page_Load. The framework will then rehydrate state from all your controls as long they were constructed in the CreateChildControls call. No control alloc'd in the method (or in the Composite's c'str) and no rehydration.

The best method I am using for now is storing the data being bound to, rebinding the grid in CreateChildControls to recover its control structure. I then recover the check box state and process paging links, etc. The drawback is that for clicking my Next link for instance is that I bind twice. However, as I cache the data source, I do not make multiple db calls.

It appears I'm back an track but feel free to share any additional brilliance on the subject :-)

Sieggy
5 Items, 1 Pages 1 |< << Go >> >|


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