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Shan's Simple Examples: File uploads with Flex and ColdFusion
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Flex: Making Scrollbars Follow Focus
If you've ever created a form tall enough to require a vertical scroll bar in Flex, you may have not even have noticed that you have you scroll down manually when focus moves below the visible part of a window. Users, however, notice, especially if they don't have a scroll wheel on their mouse.
There doesn't seem to be any built-in or easy way to correct this, so I wrote a helper class to facilitate. I called it "com.webapper.autoscroll.AutoScroll", and it has one static function "autoScroll(event)" that should be called anytime a given container changes focus (focusIn) or finishes resizing (updateComplete).
To use it, simply add the following to the scrolling container (Canvas, Panel, etc) that contains the input fields you want to chase focus on:
focusIn="AutoScroll.autoScroll(event);"
The autoScroll() method determines the y position of the current focus relative to the top of the container, and repositions its vertical scroll bar to ensure that the item with focus is completely visible, if necessary.
Source, library SWC, and demo are at: http://www.darylb.net/flexautoscroll/
I've been bitten with this also. at least I have a fighting chance next time.
In that respect, it may work a little /too/ well.
You can disable that by removing the event handler on updateComplete, so that autoscroll only moves the scroll bar when focus actually changes.