Careful using rowIndex in an itemrenderer

The original title of this blog post was different to begin, but as I was coding I discovered that what I thought was going to be a great tip to share, was in fact not. You see I was trying to do some specialized display in an itemRendererer (in a DataGrid) but was not able to do it. As-is, each row in a particuliar column was displaying an amount, but the requirement came to me to display an amount range based on the value in the next row. For example, say the first row of data was displaying 2.00, and the amount value in the next row was 5.00...the first row should then display 2.00 - 4.99.

I was thinking I could accomplish this by using an itemRenderer and making use of the this.listData.rowIndex property to allow me to "know" the current index in the ArrayCollection, to therefore be able to get the data from the next row, if available. However the rowIndex property gives you the index of the current row being display by the itemRenderer, not the index in the ArrayCollection. Thus my idea backfired.

The reason is, the this.listData.rowIndex property returns the index of the current row being displayed, not the current index of the ArrayCollection as it is being traversed. So if your DataGrid (or any list control for that matter) is only displaying 4 rows, then the rowIndex property will only have values that go from 0 to 3; but your ArrayCollection might have X items in it, so its index will go from 0 to X - 1. And as the user scrolls the list control, although the rowIndex property will always have a range of 0 to 3, the current items from the ArrayCollection that are being displayed, might be items that have index of 14 to 17.

I still don't know how to resolve this issue, if anyone has any ideas, please let me know.


Joseph Labrecque said...

I was dealing with the same exact issue and actually shelved the project for a while.

I have no solution but would be super interested if anyone has one.

TimHoff said...

In your itemRenderer:

import mx.controls.DataGrid;

private var myOwner : DataGrid;

override public function set data(value:Object):void
super.data = value;

myOwner = owner as DataGrid;

var myOwnerDataProvider:ArrayCollection = myOwner.dataProvider as ArrayCollection;

var myIndex:int = myOwnerDataProvider.getItemIndex( data );

if ( index < myOwnerDataProvider.length - 1 )
var myNextObject : MyObject = myOwnerDataProvider.getItemAt( index + 1 );

// parse my amount range; using myNextObject amount


Not a pretty solution, but it works. This is typed code, so there may be some tweaking needed.


Dimitrios "Jimmy" Gianninas said...

The myOwnerDataProvider.getItemIndex( data ); is what I should have used...worked like a charm, thx Tim!

TimHoff said...

Oh wow, I didn't even realize that this was your blog Dimitios. Your posts have helped me a lot over the years. I'm glad that I could return the favor.


Dimitrios "Jimmy" Gianninas said...

What goes around, comes around Tim :)

TimHoff said...

True that. :)

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Anonymous said...


listData.rowIndex + DataGrid(owner).verticalScrollPosition

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vin said...


For a similar scenarion i used TimHoff solution of overridibg the set data method. I my case i will i will add rows to data grid in two ways. One way is assigning the
dataprovider which comes from a service call and the other is simply creating a new object and
adding to the collection.

Issue here is when the coll is empty and I add a new object to it
then the owner is DataGrid, but if
while assigning the coll from the service call the owner is some ListbaseContentHolder and owner.parent is DataGrir.

Does any one have clue abt this.


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Scott Enders said...

Thank you for your post. I didn't even realize this was an issue until I happen to run across this blog post (while searching on something else). I went back to check my work and you were right.

I also ran into and issue of the scroll position getting screwy when I updated the dataProvider of the datagrid. I found that this link had a good solution:

How to data bind DataGrid component without scrolling up?

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