Adding Scrollbar and buttons to Dynamic Text

Question

Hello,
I am trying to connect dynamic text to scrollbar and buttons. I did tutorial and Lynda.com and practically pasted the code in with my file names and for some reason it does not work. It says I have a "Access of Undefined Property mask_mc" Did I need to create a variable for this? I didn't in the tutorial.
Right now I have the dynamic text loading successfuly in 2 different places and I wantd to add the scrollbar. I put the variables on frame 1 code and then I put the actually load code on the frame where it is needed.
Any suggestions?
Thanks! Sandra
HERE IS CODE FOR FRAME 1:
var textLoader:URLLoader = new URLLoader();
var textReq:URLRequest;
var scrollPercent:Number = 0;
var minScroll:Number;
var maxScroll:Number;
var targetScroll:Number = philText_mc.y;
var easing:Number = 5;
var scrollAmt:Number = 15;
var scrollDirection:Number = 0;
HERE IS CODE FOR FRAME WHERE TEXT LOADS:
textReq = new URLRequest("text_philosophy.txt");
function philosophyTextLoaded(event:Event):void {
    philText_mc.philosophy_txt.text = textLoader.data;
    minScroll = philText_mc.y;
    maxScroll = minScroll - philText_mc.height + mask_mc.height;
function dragScroller(event:MouseEvent):void
    var dragX:Number = line_mc.x - scroller_mc.width/2 + 1;
    var dragY:Number = line_mc.y;
    var dragW:Number = 0;
    var dragH:Number = line_mc.height - scroller_mc.height;
    scroller_mc.startDrag(false, new Rectangle(dragX,dragY,dragW,dragH));
    stage.addEventListener(MouseEvent.MOUSE_UP, stopDragging);
    stage.addEventListener(Event.ENTER_FRAME, setScrollPercent);
    stage.removeEventListener(Event.ENTER_FRAME, scrollText);
function stopDragging(event:MouseEvent):void
    scroller_mc.stopDrag();
function setScrollPercent(event:Event):void
    scrollPercent = (scroller_mc.y - line_mc.y) / (line_mc.height - scroller_mc.height);
    if(scrollPercent < 0)
        scrollPercent = 0;
    else if(scrollPercent > 1)
        scrollPercent = 1;
    targetScroll = (scrollPercent * (maxScroll - minScroll)) + minScroll;
    philText_mc.y -= (philText_mc.y - targetScroll) / easing;
function scrollUp(event:MouseEvent):void
    setDirection(scrollAmt);
function scrollDown(event:MouseEvent):void
    setDirection(-scrollAmt);
function setDirection(dir:Number):void
    scrollDirection = dir;
    stage.addEventListener(Event.ENTER_FRAME, scrollText);
    stage.addEventListener(MouseEvent.MOUSE_UP, stopScrolling);
    stage.removeEventListener(Event.ENTER_FRAME, setScrollPercent);
function scrollText(event:Event):void
    targetScroll += scrollDirection;
    philText_mc.y -= (philText_mc.y - targetScroll) / easing;
    if(philText_mc.y > minScroll)
        philText_mc.y = minScroll;
        targetScroll = minScroll;
    else if(philText_mc.y < maxScroll)
        philText_mc.y = maxScroll;
        targetScroll = maxScroll;
    scrollPercent = (philText_mc.y - minScroll) / (maxScroll - minScroll);
    scroller_mc.y = (scrollPercent * (line_mc.height - scroller_mc.height)) + line_mc.y;
function stopScrolling(event:MouseEvent):void
    scrollDirection = 0;
textLoader.load(textReq);
scroller_mc.buttonMode = true;
philText_mc.external_txt.autoSize = TextFieldAutoSize.LEFT;
scroller_mc.addEventListener(MouseEvent.MOUSE_DOWN, dragScroller);
textLoader.addEventListener(Event.COMPLETE, philosophyTextLoaded);
up_btn.addEventListener(MouseEvent.MOUSE_DOWN, scrollUp);
down_btn.addEventListener(MouseEvent.MOUSE_DOWN, scrollDown);

Answer 1

Hello again,
Maybe I am asking this question wrong. Instead of making you try and figure out what's going on in my file what I really need to know is how you would take this code I am attaching and make it happen on another frame besides frame 1 and it doesn't appear on frame 1. I think this may help me understand a little better.
Also another way I was thinking to get around this would be to pull in an external swf into the spot where I want this text to go because I can make the scrollbars and external text work when it is the only thing going on in the movie. Would this be a bad way to set this up? and also SInce it is an external movie would I have maintimeline issues with mouse/scroller control?
thanks! sandra
Here is working code:
var textLoader:URLLoader = new URLLoader();
var textFile:URLRequest = new URLRequest("text/external.txt");
var scrollPercent:Number = 0;
var minScroll:Number;
var maxScroll:Number;
var targetScroll:Number = text_mc.y;
var easing:Number = 5;
var scrollAmt:Number = 15;
var scrollDirection:Number = 0;
function textLoaded(event:Event):void
    text_mc.external_txt.text = textLoader.data;
    minScroll = text_mc.y;
    maxScroll = minScroll - text_mc.height + mask_mc.height;
function dragScroller(event:MouseEvent):void
    var dragX:Number = line_mc.x - scroller_mc.width/2 + 1;
    var dragY:Number = line_mc.y;
    var dragW:Number = 0;
    var dragH:Number = line_mc.height - scroller_mc.height;
    scroller_mc.startDrag(false, new Rectangle(dragX,dragY,dragW,dragH));
    stage.addEventListener(MouseEvent.MOUSE_UP, stopDragging);
    stage.addEventListener(Event.ENTER_FRAME, setScrollPercent);
    stage.removeEventListener(Event.ENTER_FRAME, scrollText);
function stopDragging(event:MouseEvent):void
    scroller_mc.stopDrag();
function setScrollPercent(event:Event):void
    scrollPercent = (scroller_mc.y - line_mc.y) / (line_mc.height - scroller_mc.height);
    if(scrollPercent < 0)
        scrollPercent = 0;
    else if(scrollPercent > 1)
        scrollPercent = 1;
    targetScroll = (scrollPercent * (maxScroll - minScroll)) + minScroll;
    text_mc.y -= (text_mc.y - targetScroll) / easing;
function scrollUp(event:MouseEvent):void
    setDirection(scrollAmt);
function scrollDown(event:MouseEvent):void
    setDirection(-scrollAmt);
function setDirection(dir:Number):void
    scrollDirection = dir;
    stage.addEventListener(Event.ENTER_FRAME, scrollText);
    stage.addEventListener(MouseEvent.MOUSE_UP, stopScrolling);
    stage.removeEventListener(Event.ENTER_FRAME, setScrollPercent);
function scrollText(event:Event):void
    targetScroll += scrollDirection;
    text_mc.y -= (text_mc.y - targetScroll) / easing;
    if(text_mc.y > minScroll)
        text_mc.y = minScroll;
        targetScroll = minScroll;
    else if(text_mc.y < maxScroll)
        text_mc.y = maxScroll;
        targetScroll = maxScroll;
    scrollPercent = (text_mc.y - minScroll) / (maxScroll - minScroll);
    scroller_mc.y = (scrollPercent * (line_mc.height - scroller_mc.height)) + line_mc.y;
function stopScrolling(event:MouseEvent):void
    scrollDirection = 0;
textLoader.load(textFile);
scroller_mc.buttonMode = true;
text_mc.external_txt.autoSize = TextFieldAutoSize.LEFT;
scroller_mc.addEventListener(MouseEvent.MOUSE_DOWN, dragScroller);
textLoader.addEventListener(Event.COMPLETE, textLoaded);
up_btn.addEventListener(MouseEvent.MOUSE_DOWN, scrollUp);
down_btn.addEventListener(MouseEvent.MOUSE_DOWN, scrollDown);