Scroll to selected item in Flex 4 Spark List component

Question

I\'m setting selected element in s:List component with Actionscript, it works, but List doesn\'t scroll to selected item -- need to scroll with scrollbar or mouse. Is it pos

Answer 1

This worked for me. had to use the callLater.

list.selectedItem = "MyTestItem"; //or list.selectedIndex = 10;
this.callLater(updateIndex); //dispatch an update to list

private function updateIndex():void {
    list.ensureIndexIsVisible(list.selectedIndex);
}

Answer 2

//try this
this.callLater(updateIndex);//where you want to set the selectedIndex

private function updateIndex():void
{
    list.selectedIndex = newIndex;
    list.ensureIndexIsVisible(newIndex);
}

Answer 3

You'll probably want to access the List's scroller directly and do something like:

list.scroller.scrollRect.y = list.itemRenderer.height * index;

Answer 4

It is a bug - you can see the demonstration and a workaround at the https://issues.apache.org/jira/browse/FLEX-33660

Answer 5

This custom List component extension worked for me:

<s:List
    xmlns:fx="http://ns.adobe.com/mxml/2009"
    xmlns:s="library://ns.adobe.com/flex/spark"
    valueCommit="callLater(ensureIndexIsVisible, [selectedIndex])">
</s:List>

Answer 6

In flex-3 there is a scrollToIndex method and hence you can call

list.scrollToIndex(list.selectedIndex);

I believe this should work in flex-4 too.