How small a test case can you build? I think it is time to see how you're trying to wire this up.
From: [email protected] [mailto:[email protected]] On Behalf Of Glenn Jones Sent: Monday, January 12, 2009 9:21 AM To: [email protected] Subject: Re: [flexcoders] DataGrid selectAll problem I've tried setting just selectedIndices - same result In my CheckBoxDataGrid.selectAll() method, I tried calling invalidateProperties/invalidateList/validateNow - same result. In my CheckBoxHeaderRenderer.clickHandler, I tried using callLater to execute CheckBoxDataGrid.selectAll() - same result. I repeated the callLater test after removing invalidateProperties/invalidateList/validateNow - same result. Any suggestions on which operations I should use for callLater()? As a workaround, I added an event listener for itemEditBeginning on the checkboxdatagrid. If the selected item count was > 1, then I called event.preventDefault(). This actually triggers a crash sometime later in mx:DataGrid (line 3889 - itemEditorInstance is null). On Mon, Jan 12, 2009 at 10:07 AM, Alex Harui <[email protected]<mailto:[email protected]>> wrote: I would not set both selectedItems and selectedIndices. Probably just selectedIndices because it should be faster. I don't think selectItem will be called if the item is already selected. Due to the way invalidation works, maybe it hasn't been de-selected yet. Sometimes, callLater can help in these situations. From: [email protected]<mailto:[email protected]> [mailto:[email protected]<mailto:[email protected]>] On Behalf Of Glenn Jones Sent: Saturday, January 10, 2009 4:52 PM To: [email protected]<mailto:[email protected]> Subject: Re: [flexcoders] DataGrid selectAll problem I started with the example from your blog dated Feb 2008 (CheckBoxListAndDataGrid). To deselect the other rows, the checkbox column header renderer calls a 'selectAll()' method on the CheckBoxDataGrid with a flag of false. That method builds two arrays - one for all items in the collection and one for all indices in the collection. It then replaces mx:DataGrid.selectedItems and selectedIndices with new arrays. In the deselect case, the new arrays are empty. In the select all case then have all items/indices. Visually, selectAll true/false seems to work when it's called. But in the use-case I describe below I'm counting on the mx:DataGrid.selectItem() to be called in order to deselect rows in the case that a single row is selected. Based on trace statements, I know that mx:DataGrid.selectItem() is never called when the problem occurs Is there something about the way I'm selecting things which causes the selectItem() to not be called? I tried replacing just selectedItemds or just selectedIndicies or both. it doesn't seem. Thanks, Glenn On Fri, Jan 9, 2009 at 1:11 AM, Alex Harui <[email protected]<mailto:[email protected]>> wrote: Which example did you start with? Which event do you use to deselect the other rows, and what does that code look like? From: [email protected]<mailto:[email protected]> [mailto:[email protected]<mailto:[email protected]>] On Behalf Of Glenn Jones Sent: Thursday, January 08, 2009 9:49 PM To: [email protected]<mailto:[email protected]> Subject: [flexcoders] DataGrid selectAll problem Hi, I'm using Flex 3.2 and I have a DataGrid which implements a column of checkboxes to select rows. I started with Alex' example. Then I added a header renderer on the checkbox column such that if check the header, then all rows are selected. To implement the select all behavior, I'm creating an array of indices for [0..n] and assigning that array to mx:DataGrid.selectedIndices. For the most part this works fine. But if the DataGrid is editable, then I sometimes have a problem. The problem is that if all rows are selected, and you click on an editable cell, sometimes the cell becomes editable without deselecting all of the other rows. The behavior I want is that if you start editing a cell, then just that row becomes selected. This happens some of time, but not all of the time. If the grid is non-editable, then I can't reproduce the problem. I overrode mx:DataGrid.selectItem() in order to clear the checkbox in the header renderer any time a single item is selected. I've noticed that when the problem behavior occurs, the mx:DataGrid.selectItem() method is never called. It's almost like there's some race condition between selecting an item and starting a cell edit. Any ideas on how I could work around this? Thanks, Glenn
