Disable TextField scrolling on selection

Flash has a pesky issue when you dynamically populate a selectable TextField–when a user highlights the text, the content scrolls because it’s slightly larger than the autoSized height.

I’d solved this exact problem ages ago, but couldn’t find the code. After some fiddling, here’s an ActionScript 3.0 solution that allows selectable text–while eliminating selectable scrolling.

label_txt.autoSize = TextFieldAutoSize.LEFT;
label_txt.htmlText += "<p>My text goes here</p>";
var tempHeight:Number = label_txt.height;
label_txt.autoSize = TextFieldAutoSize.NONE;
label_txt.height = tempHeight + 10;

Here, you allow autoSize to let the content define the height, next you save the height, then you disable the autoSize. Finally, you re-assign the TextField’s height with a bit added on to prevent scrolling.