Acrobat Javascript - Determine when text field srollbar is being displayed

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i have text field propeties set multi-line, scroll long text, , allow rich text formatting.  need way of checking see if user typed in more can displayed on screen - need javascript code tell if user sees "+" sign indicating there's more text can seen on screen.

 

thanks,

 

david

there's isn't way find js, unless bunch of complex

calculations based on field's size in relation font size,

keeping track of line breaks , other things.



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