A problem with a menu on my site

Discussion in 'Javascript' started by Kevin Morenski, Jun 30, 2003.

  1. Hello,

    This problem is truly baffling. On my site
    (http://www.geekcenter.net/temp.html), I have a javascript menu. At the
    bottom of the page is white space that is deleted when you place your mouse
    over the link. To be quite honest, I have absolutely NO idea why this
    happens. None whatsoever. I do, however, know that its cause lies in the
    javascript file I've included below. If anyone could help, I'd greatly
    appreciate it.

    Thanks,
    Kevin

    ----------------------------------------------

    // Javascript File

    var isDOM = (document.getElementById ? true : false);
    var isIE4 = ((document.all && !isDOM) ? true : false);
    var isNS4 = (document.layers ? true : false);

    function getRef(id) {
    if (isDOM) return document.getElementById(id);
    if (isIE4) return document.all[id];
    if (isNS4) return document.layers[id];
    }

    function getSty(id) {
    return (isNS4 ? getRef(id) : getRef(id).style);
    }

    // Hide timeout.
    var popTimer = 0;

    // Array showing highlighted menu items.
    var litNow = new Array();
    function popOver(menuNum, itemNum) {
    clearTimeout(popTimer);
    hideAllBut(menuNum);
    litNow = getTree(menuNum, itemNum);
    changeCol(litNow, true);
    targetNum = menu[menuNum][itemNum].targetmenu;
    if (targetNum > 0) {
    thisX = parseInt(menu[menuNum][0].ref.left) +
    parseInt(menu[menuNum][itemNum].ref.left);
    thisY = parseInt(menu[menuNum][0].ref.top) +
    parseInt(menu[menuNum][itemNum].ref.top);
    with (menu[targetNum][0].ref) {
    left = parseInt(thisX + menu[targetNum][0].x);
    top = parseInt(thisY + menu[targetNum][0].y);
    visibility = 'visible';
    }
    }
    }

    function popOut(menuNum, itemNum) {
    if ((menuNum == 0) && !menu[menuNum][itemNum].targetmenu)
    hideAllBut(0)
    else
    popTimer = setTimeout('hideAllBut(0)', 500);
    }

    function getTree(menuNum, itemNum) {
    // The array index is the menu number. Its contents are null (if the menu
    is not a parent)
    // or the item number of the menu that has kids (just so that we can light
    it up)
    itemArray = new Array(menu.length);

    while(1) {
    itemArray[menuNum] = itemNum;
    // If we've reached the top of the hierarchy, return
    if (menuNum == 0) return itemArray;
    itemNum = menu[menuNum][0].parentItem;
    menuNum = menu[menuNum][0].parentMenu;
    }
    }

    // Pass an array and a boolean to specify color change, true = over color.
    function changeCol(changeArray, isOver) {
    for (menuCount = 0; menuCount < changeArray.length; menuCount++) {
    if (changeArray[menuCount]) {
    newCol = isOver ? menu[menuCount][0].overCol :
    menu[menuCount][0].backCol;
    // Change the colors of the div/layer background.
    with (menu[menuCount][changeArray[menuCount]].ref) {
    if (isNS4) bgColor = newCol;
    else backgroundColor = newCol;
    }
    }
    }
    }

    function hideAllBut(menuNum) {
    var keepMenus = getTree(menuNum, 1);
    for (count = 0; count < menu.length; count++) {
    if (!keepMenus[count])
    menu[count][0].ref.visibility = 'hidden';
    changeCol(litNow, false);
    }
    }

    function Menu(VerticalMenu, PopoutIcon, x, y, width, overCol, backCol,
    borderClass, textClass) {
    // True or false - a vertical menu or not
    this.VerticalMenu = VerticalMenu;

    // The popout icon used (if any) for this menu
    this.PopoutIcon = PopoutIcon;

    // Position and size settings.
    this.x = x;
    this.y = y;
    this.width = width;

    // Colors of menu and items.
    this.overCol = overCol;
    this.backCol = backCol;

    // The stylesheet class used for item borders and the text within items.
    this.borderClass = borderClass;
    this.textClass = textClass;

    // Parent menu and item numbers, indexed later.
    this.parentMenu = null;
    this.parentItem = null;

    // Reference to the object's style properties (set later).
    this.ref = null;
    }

    function Item(text, href, target, length, spacing, targetmenu) {
    this.text = text;
    this.href = href;
    this.target = target;
    this.length = length;
    this.spacing = spacing;
    this.targetmenu = targetmenu;

    // Reference to the object's style properties (set later).
    this.ref = null;
    }

    function writeMenu() {
    if (!isDOM && !isIE4 && !isNS4) return;
    for (currMenu = 0; currMenu < menu.length; currMenu++) with
    (menu[currMenu][0]) {
    // Variable for holding the HTML for items and the positions of the next
    items.
    var str = '', itemX = 0, itemY = 0;

    // Items start from 1 in the array (0 is menu object).
    // Also, they use properties of each item nested in the other with() for
    construction.
    for (currItem = 1; currItem < menu[currMenu].length; currItem++) with
    (menu[currMenu][currItem]) {
    var itemID = 'menu' + currMenu + 'item' + currItem;

    // The width and height of the menu item depending on its orientation
    var w = (VerticalMenu ? width : length);
    var h = (VerticalMenu ? length : width);

    // Create a div or layer text string with appropriate styles/properties.

    if (isDOM || isIE4)
    str += '<div id="' + itemID + '" style="position: absolute; left: ' +
    itemX + '; top: ' + itemY + '; width: ' + w + '; height: ' + h + ';
    visibility: inherit; background: #FFFFFF;"';

    if (isNS4)
    str += '<layer id="' + itemID + '" left="' + itemX + '" top="' + itemY +
    '" width="' + w + '" height="' + h + '" visibility="inherit"
    bgcolor="#FFFFFF"';

    if (borderClass)
    str += 'class="NormalBorder"';

    // Add mouseover handlers and finish div/layer.
    str += 'onMouseOver="popOver(' + currMenu + ',' + currItem + ')"
    onMouseOut="popOut(' + currMenu + ',' + currItem + ')">';

    // Add contents of item (default: table with link inside).
    // In IE/NS6+, add padding if there's a border to emulate NS4's layer
    padding.
    // If a target frame is specified, also add that to the <a> tag.

    str += '<table width="' + w + '" border="0" cellspacing="0"
    cellpadding="0"><tr><td align="left" height="' + h + '"
    onClick="window.location=\'' + href + '\';" style="cursor: hand"
    valign="middle"><a class="' + textClass + '" href="' + href + '">' + text +
    '</a></td>';

    if (targetmenu > 0) {
    // Set target's parents to this menu item.
    menu[targetmenu][0].parentMenu = currMenu;
    menu[targetmenu][0].parentItem = currItem;

    // Add a popout indicator.
    if (PopoutIcon)
    str += '<td align="right">' + PopoutIcon + '</td>';
    }

    str += '</tr></table>' + (isNS4 ? '</layer>' : '</div>');

    if (VerticalMenu)
    itemY += length + spacing;
    else
    itemX += length + spacing;
    }

    if (isDOM) {
    var newDiv = document.createElement('div');
    document.getElementsByTagName('body').item(0).appendChild(newDiv);
    newDiv.innerHTML = str;
    ref = newDiv.style;
    ref.position = 'absolute';
    ref.visibility = 'hidden';
    }

    // Insert a div tag to the end of the body with menu HTML in place for
    IE4.
    if (isIE4) {
    document.body.insertAdjacentHTML('beforeEnd', '<div id="menu' + currMenu
    + 'div" ' + 'style="position: absolute; visibility: hidden">' + str +
    '</div>');
    ref = getSty('menu' + currMenu + 'div');
    }

    // In NS4, create a reference to a new layer and write the items to it.
    if (isNS4) {
    ref = new Layer(0);
    ref.document.write(str);
    ref.document.close();
    }

    for (currItem = 1; currItem < menu[currMenu].length; currItem++) {
    itemName = 'menu' + currMenu + 'item' + currItem;
    if (isDOM || isIE4)
    menu[currMenu][currItem].ref = getSty(itemName);
    if (isNS4)
    menu[currMenu][currItem].ref = ref.document[itemName];
    }
    }

    with(menu[0][0]) {
    ref.left = x;
    ref.top = y;
    ref.visibility = 'visible';
    }
    }
     
    Kevin Morenski, Jun 30, 2003
    #1
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