Sets editBox's text to the specified string.
- str (string) -- the string you want to appear in the EditBox
You should call a SetText("") every time you read from an EditBox, so the command line is free for the next input.
SetText fails when the text contains characters that aren't renderable (e.g. control chars, invalid UTF8). In that case the EditBox is cleared and EditBox:GetText() returns the empty string.