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Expandable Outlines
SPECIAL EDITION; the director's cut 2/2

Page HTML

<DIV ID="elOneParent" CLASS="parent">
...
</DIV>

<DIV ID="elOneChild" CLASS="child">
...
</DIV>

<DIV ID="elTwoParent" CLASS="parent">
...
</DIV>

<DIV ID="elTwoChild" CLASS="child">
...
</DIV>

.
. continue parent/child groupings until end of outline,
. then enclose remaining page elements in DIVs
.

<DIV ID="elRest1" CLASS="regular">
...
</DIV>

<DIV ID="elRest2" CLASS="regular">
...
</DIV>

.
. possibly more DIVs
.

<SCRIPT LANGUAGE="JavaScript1.2">
<!--
    if (NS4) {
        firstEl = "elOneParent";
        firstInd = getIndex(firstEl);
        arrange();
    }
//-->
</SCRIPT>
</BODY>
</HTML>

The Script

<SCRIPT LANGUAGE="JavaScript">
<!--

if (ver4) {
    with (document) {
        write("<STYLE TYPE='text/css'>");
        if (NS4) {
            write(".parent {position:absolute; visibility:visible}");
            write(".child {position:absolute; visibility:visible}");
            write(".regular {position:absolute; visibility:visible}")
        }
        else {
            write(".child {display:none}")
        }
        write("</STYLE>");
    }
}

function getIndex(el) {
    ind = null;
    for (i=0; i<document.layers.length; i++) {
        whichEl = document.layers[i];
        if (whichEl.id == el) {
            ind = i;
            break;
        }
    }
    return ind;
}

function arrange() {
    nextY = document.layers[firstInd].pageY + document.layers[firstInd].document.height;
    for (i=firstInd+1; i<document.layers.length; i++) {
        whichEl = document.layers[i];
        if (whichEl.visibility != "hide") {
            whichEl.pageY = nextY;
            nextY += whichEl.document.height;
        }
    }
}

function initIt(){
    if (!ver4) return;
    if (NS4) {
        for (i=0; i<document.layers.length; i++) {
            whichEl = document.layers[i];
            if (whichEl.id.indexOf("Child") != -1) whichEl.visibility = "hide";
        }
        arrange();
    }
    else {
        divColl = document.all.tags("DIV");
        for (i=0; i<divColl.length; i++) {
            whichEl = divColl(i);
            if (whichEl.className == "child") whichEl.style.display = "none";
        }
    }
}

function expandIt(el) {
    if (!ver4) return;
    if (IE4) {
        whichEl = eval(el + "Child");
        whichIm = event.srcElement;
        if (whichEl.style.display == "none") {
            whichEl.style.display = "block";
            whichIm.src = "triUp.gif";        
        }
        else {
            whichEl.style.display = "none";
            whichIm.src = "triDown.gif";
        }
    }
    else {
        whichEl = eval("document." + el + "Child");
        whichIm = eval("document." + el + "Parent.document.images['imEx']");
        if (whichEl.visibility == "hide") {
            whichEl.visibility = "show";
            whichIm.src = "triUp.gif";
        }
        else {
            whichEl.visibility = "hide";
            whichIm.src = "triDown.gif";
        }
        arrange();
    }
}

onload = initIt;

//-->
</SCRIPT>

Bonus

For outlines with many expandable items, we look at expanding/collapsing all of them with one click.

Produced by Peter Belesis and

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Created: Jan. 14, 1998
Revised: Jan. 18, 1998

URL: http://www.webreference.com/dhtml/column12/allCode2.html