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https://issues.apache.org/jira/browse/FLEX-23974?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13637427#comment-13637427
]
Mark Kessler commented on FLEX-23974:
-------------------------------------
Test application that reproduces issue and shows correctly working spark
datagrid for comparison. No idea why you need to reference the ItemRenderer to
get an index from it before setting a new index....
<?xml version="1.0" encoding="utf-8"?>
<!---
Test application
-->
<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009";
xmlns:s="library://ns.adobe.com/flex/spark"
xmlns:mx="library://ns.adobe.com/flex/mx" >
<fx:Script>
<![CDATA[
import mx.collections.ArrayCollection;
[Bindable]
protected var items:ArrayCollection = new
ArrayCollection([{Country:"SPAIN"},{Country:"CARTAGO"},{Country:"AMERICA"},{Country:"AUSTRALIA"}]);
protected function onApplyFilter(event:Event):void {
items.filterFunction = filter;
items.refresh();
datagrid_id.selectedIndex = 0;
datagrid_id2.selectedIndex = 0;
}
protected function filter(o:Object):Boolean {
if(String(o.Country).indexOf("RAL") == -1){
return false;
}
return true;
}
]]>
</fx:Script>
<s:layout>
<s:VerticalLayout horizontalAlign="center" verticalAlign="middle"
gap="0" />
</s:layout>
<s:Label text="MX DataProvider showing issue" />
<mx:DataGrid id="datagrid_id" dataProvider="{items}" width="300"
height="200">
</mx:DataGrid>
<mx:Button id="applyFilter" label="Apply Filter"
click="onApplyFilter(event)" />
<mx:Label text="1. selectedIndex: {datagrid_id.selectedIndex}" />
<mx:Spacer height="30" />
<s:Label text="Spark DataProvider for comparison" />
<s:DataGrid id="datagrid_id2" dataProvider="{items}" width="300"
height="200">
</s:DataGrid>
<mx:Label text="2. selectedIndex: {datagrid_id2.selectedIndex}" />
</s:Application>
> Datagrid with ArrayCollection provider, error at setter of selectedIndex
> after applying filters to the ArrayCollection
> ----------------------------------------------------------------------------------------------------------------------
>
> Key: FLEX-23974
> URL: https://issues.apache.org/jira/browse/FLEX-23974
> Project: Apache Flex
> Issue Type: Bug
> Components: mx: DataGrid
> Affects Versions: Adobe Flex SDK 3.2 (Release)
> Environment: Affected OS(s): Windows
> Affected OS(s):
> Browser: Firefox 3.x
> Language Found: English
> Reporter: Adobe JIRA
>
> Steps to reproduce:
> 1. Create a DataGrid with DataProvider an ArrayCollection
> 2. Full the ArrayCollection with N items
> 3. Apply a filter to the ArrayCollection that only one item is shown (not in
> position 0)
> 4. set the datagrid selectedIndex to 0
>
> Actual Results:
> the datagrid selectionIndex is set to the last known position of the item
> instead to 0
>
>
> Expected Results:
> datagrid selectionIndex = 0
>
>
> Workaround (if any):
> After Applying the filters to the arrayCollection use
> datagrid.validateNow(); before settin selectionIndex to 0
>
>
> ------
> Information found when debugging the flex api.
> DATAGRID BEFORE APPLYING FILTERS
> * SPAIN
> * CARTAGO
> * AMERICA
> * AUSTRALIA
> filter: name cotains "RAL"
> DATAGRID AFTER APPLYING FILTERS
> * AUSTRALIA
> the piece of code:
> -------
> acResultats.filterFunction = componentFiltre.objectBelongFilters;
> acResultats.refresh();
> if(acResultatsFiltrats.length > 0){
> //datagrid_id.validateNow(); <-- Uncomment this to allow the app to
> work fine
> datagrid_id.selectedIndex = 0;
> itemClicked();
> }
> -------
> When debugging the line datagrid_id.selectedIndex = 0; the collection
> attribute is correctly set to only 1 element in the array and the length set
> to 1. So it follow the code road:
> * selectedIndex = 0
> ---> commitSelectedIndex(value)
> ------> selectItem(item:UIDToItemRenderer(uid), false, false);
> ---------> var index:int = itemRendererToIndex(item)
> and this returns the older position of the item, instead the new one setted
> on its property index, so item has the real information but instead using it,
> it uses a value returned by the function itemRendererToIndex.
> --
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