[Flashcoders] Getting the line index at the caretIndex

[Steven Sacks]

I'm trying to get the line index at the caret index in a multiline input 
TextField, but it doesn't work.  Any ideas why?

var tf:TextField; // this is my TextField
tf.addEventListener(Event.CHANGE, onChange);
function onChange(event:Event):void
{
    var caret:int = tf.caretIndex;
    var line:int = tf.getLineIndexOfChar(caret);
    // line is always traces -1
    trace("caret=" + caret + ", line=" + line);
}

I typed this:

abcd
efgh
cekjk
wejk
rhwejk
rwehkj
werhkj
rehwk
rewkj
rehkj
rehkj
rewhkj
rewhkjgiorehj
fdkjs
cdshkjfhkj

Output is this:

caret=0, line=-1
caret=1, line=-1
caret=2, line=-1
caret=3, line=-1
caret=4, line=-1
caret=5, line=-1
caret=6, line=-1
caret=7, line=-1
caret=8, line=-1
caret=9, line=-1
caret=10, line=-1
caret=11, line=-1
caret=12, line=-1
caret=13, line=-1
caret=14, line=-1
caret=15, line=-1
caret=16, line=-1
caret=17, line=-1
caret=18, line=-1
caret=19, line=-1
caret=20, line=-1
caret=21, line=-1
caret=22, line=-1
caret=23, line=-1
caret=24, line=-1
caret=25, line=-1
caret=26, line=-1
caret=27, line=-1
caret=28, line=-1
caret=29, line=-1
caret=30, line=-1
caret=31, line=-1
caret=32, line=-1
caret=33, line=-1
caret=34, line=-1
caret=35, line=-1
caret=36, line=-1
caret=37, line=-1
caret=38, line=-1
caret=39, line=-1
caret=40, line=-1
caret=41, line=-1
caret=42, line=-1
caret=43, line=-1
caret=44, line=-1
caret=45, line=-1
caret=46, line=-1
caret=47, line=-1
caret=48, line=-1
caret=49, line=-1
caret=50, line=-1
caret=51, line=-1
caret=52, line=-1
caret=53, line=-1
caret=54, line=-1
caret=55, line=-1
caret=56, line=-1
caret=57, line=-1
caret=58, line=-1
caret=59, line=-1
caret=60, line=-1
caret=61, line=-1
caret=62, line=-1
caret=63, line=-1
caret=64, line=-1
caret=65, line=-1
caret=66, line=-1
caret=67, line=-1
caret=68, line=-1
caret=69, line=-1
caret=70, line=-1
caret=71, line=-1
caret=72, line=-1
caret=73, line=-1
caret=74, line=-1
caret=75, line=-1
caret=76, line=-1
caret=77, line=-1
caret=78, line=-1
caret=79, line=-1
caret=80, line=-1
caret=81, line=-1
caret=82, line=-1
caret=83, line=-1
caret=84, line=-1
caret=85, line=-1
caret=86, line=-1
caret=87, line=-1
caret=88, line=-1
caret=89, line=-1
caret=90, line=-1
caret=91, line=-1
caret=92, line=-1
caret=93, line=-1
caret=94, line=-1
caret=95, line=-1
caret=96, line=-1
caret=97, line=-1
caret=98, line=-1
caret=99, line=-1
caret=100, line=-1
caret=101, line=-1
caret=102, line=-1
caret=103, line=-1
caret=104, line=-1
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