Question

I have a DataGrid and I set the DataProvider to my data. When my data changes the DataGrid loses the selected row and the scroll bar jumps back to the top. How do I maintain the selection and scroll position?

Answer 1

If you just want to maintain position:

in whatever function is changing the data, first capture the selected index

var myidx:int = new int(myDG.selectedIndex);

and the scroll position

var myVertPos:int = new int(myDG.verticalScrollPosition);

run the code that changes the data then do the above steps backwards:

myDG.selectedIndex = myidx;
myDG.verticalScrollPosition = myVertPos;

Oh and you will probably want to do a check to make sure that the selected index is not over the length of items now in your DG and select the last one if it is. In my experience setting the vertical scroll position greater than the max just results in scrolling to the max.