menu bar navigator

raven posted this at 17:54 — 29th March 2001.
Joined: Jan 2001
hey all,
I would like to have a pull down menu bar in java script that works both on IEx and on netscape. what i hope it can do is be a menu similar to the menu bar in windows, ie: click on a catagory and a few options pop down, and then that can be used to navigate the visitor around the site.
here is a code that only works in IE:
<head> 
<!-- Begin 
var isDOM = false, isNS4 = false; 
if (document.all) var isDOM = true, docObj = 'document.all.', styObj = '.style'; 
else if (document.layers) var isNS4 = true, docObj = 'document.', styObj = ''; 
// Hide timeout 
var popTimer = 0; 
var litNow = new Array(); 
function popOver(menuNum, itemNum) { 
clearTimeout(popTimer); 
hideAllBut(menuNum); 
litNow = getTree(menuNum, itemNum); 
changeCol(litNow, true); 
targetNum = menu[menuNum][itemNum].target; 
if (targetNum > 0) { 
targetName = menu[targetNum][0].id; 
menuName = menu[menuNum][0].id; 
menuRef = eval(docObj + menuName + styObj); 
thisX = parseInt(menuRef.left); 
thisY = parseInt(menuRef.top); 
// Add onto this the position of the trigger item within the menu 
itemPath = docObj; 
if (isNS4) itemPath += menuName + '.document.'; 
itemRef = eval(itemPath + menuName + itemNum.toString() + styObj); 
thisX += parseInt(itemRef.left); 
thisY += parseInt(itemRef.top); 
// Add those to the target's offset to set the target's position, show it. 
with (eval(docObj + targetName + styObj)) { 
left = parseInt(thisX + menu[targetNum][0].x); 
top = parseInt(thisY + menu[targetNum][0].y); 
visibility = 'visible'; 
} 
} 
} 
function popOut(menuNum, itemNum) { 
// Hide menu in 1/2 sec, *UNLESS* another mouseover clears the timeout! 
popTimer = setTimeout('hideAllBut(0)', 500); 
} 
function getTree(menuNum, itemNum) { 
// Array index is the menu number. The contents are null (if that menu is not a parent) 
// or the item number in that menu that is an ancestor (to light it up). 
itemArray = new Array(menu.length); 
while(1) { 
itemArray[menuNum] = itemNum; 
if (menuNum == 0) return itemArray; 
itemNum = menu[menuNum][0].parentItem; 
menuNum = menu[menuNum][0].parentMenu; 
} 
} 
// Pass an array and a boolean to specify colour change, true = over colour. 
function changeCol(changeArray, isOver) { 
for (menuCount = 0; menuCount < changeArray.length; menuCount++) { 
if (changeArray[menuCount]) { 
thisMenu = menu[menuCount][0].id; 
thisItem = thisMenu + changeArray[menuCount].toString(); 
newCol = isOver ? menu[menuCount][0].overCol : menu[menuCount][0].backCol; 
if (isDOM) document.all[thisItem].style.backgroundColor = newCol; 
if (isNS4) document[thisMenu].document[thisItem].bgColor = newCol; 
} 
} 
} 
function hideAllBut(menuNum) { 
var keepMenus = getTree(menuNum, 1); 
for (count = 0; count < menu.length; count++) 
if (!keepMenus[count]) 
eval(docObj + menu[count][0].id + styObj + '.visibility = "hidden"'); 
changeCol(litNow, false); 
} 
// *** MENU CONSTRUCTION FUNCTIONS *** 
// Variable to end a div or layer based on browser. 
var endDL = isDOM ? '</div>' : '</layer>'; 
function Menu(id, x, y, width, overCol, backCol, borderCol) { 
this.id = id; 
this.x = x; 
this.y = y; 
this.width = width; 
// Colours of menu and items. 
this.overCol = overCol; 
this.backCol = backCol; 
this.borderCol = borderCol; 
// Parent menu and item numbers, indexed later. 
this.parentMenu = null; 
this.parentItem = null; 
} 
function Item(text, href, height, target) { 
this.text = text; 
this.href = href; 
this.height = height; 
this.target = target; 
} 
function startDL(id, x, y, width, height, vis, back, border, zIndex, extraProps) { 
// Write a div in IE that resembles a layer's settings, or a layer in NS. 
if (isDOM) { 
str = '<div id="' + id + '" style="position: absolute; left: ' + x + '; top: ' + y + 
'; width: ' + width + '; height: ' + height + '; visibility: ' + vis + '; '; 
if (back) str += 'background: ' + back + '; '; 
if (border) str += 'padding: 3px; border: 1px solid ' + border + '; '; 
if (zIndex) str += 'z-index: ' + zIndex + '; '; 
// End style declaration. 
str += '" '; 
} 
if (isNS4) { 
str = '<layer id="' + id + '" left="' + x + '" top="' + y + '" width="' + width + 
'" height="' + height + '" visibility="' + vis + '" '; 
if (back) str += 'bgcolor="' + back + '" '; 
if (border) str += 'style="border: 1px solid ' + border + '" '; 
if (zIndex) str += 'z-index="' + zIndex + '" '; 
} 
return str + extraProps + '>'; 
} 
function mouseProps(currMenu, currItem) { 
return 'onMouseOver="popOver(' + currMenu + ',' + currItem + ')" onMouseOut="popOut(' + currMenu + ',' + currItem + ')"'; 
} 
function writeMenus(customRoot, popInd) { 
for (currMenu = 0; currMenu < menu.length; currMenu++) { 
showMenu = true; 
if ((currMenu == 0) && customRoot) { 
document.write(customRoot); 
showMenu = false; 
} 
with (menu[currMenu][0]) { 
// Start generating a div with position offset - no dimensions, colours, mouseovers. 
// This position is only relevant for root menu anyway as all others are altered later. 
menuHTML = startDL(id, x, y, 0, 0, 'hidden', null, null, 100, ''); 
// Width is less padding (3 left & right) and border (1 left & right). 
var back = backCol, bord = borderCol, currWidth = width - 8; 
} 
// Y-position of next item, increase if you want a menu header. 
itemPos = 0; 
// Remember, items start from 1 in the array (0 is menu object itself, above). 
for (currItem = 1; currItem < menu[currMenu].length; currItem++) { 
// Auto-generate ID's in numerical sequence. 
trigID = menu[currMenu][0].id + currItem.toString(); 
// Now, work with properties of individual menu items. 
with (menu[currMenu][currItem]) { 
// Start a menu item positioned vertically, with mouse events and colours. 
menuHTML += startDL(trigID, 0, itemPos, 0, 0, 'inherit', back, bord, 100, mouseProps(currMenu, currItem)) + '<table width="' + currWidth + '" border="0" cellspacing="0" cellpadding="0"><tr>' + '<td align="left"><a class="Item" href="' + href + '">' + text + '</a></td>' + '<td class="Item" align="right">' + (target ? popInd : '') + '</td></tr></table>' + endDL; 
if (target > 0) { 
// Set target's parents to this and offset it by the current position. 
menu[target][0].parentMenu = currMenu; 
menu[target][0].parentItem = currItem; 
} 
// Move next item position down by this item's height. 
itemPos += height; 
} 
} 
// Write this menu to the document. 
if (showMenu) document.write(menuHTML + endDL); 
litNow[currMenu] = null; 
} 
} 
// End --> 
&lt;/script&gt; 
<style> 
<!-- 
.Item { text-decoration: none; color: #FFFFFF; font: 12px Arial, Helvetica } 
--> 
</style> 
</HEAD> 


<!-- Begin 
/* Syntaxes: 
* 
* menu[menuNumber][0] = new Menu('menu ID', left, top, width, 'mouseover colour', 
*'background colour', 'border colour'); 
* Left and Top are measured on-the-fly relative to the top-left corner of its trigger. 
* 
* menu[menuNumber][itemNumber] = new Item('Text', 'URL', vertical spacing to next item, 
*target menu number); 
* If no target menu (popout) is desired, set it to 0. All menus must trace back their 
* targets to the root menu! That is, every menu must be targeted by one item somewhere. 
* Even if you're not writing the root menu, you must still specify its settings here. 
*/ 
var menu = new Array(); 
// Default colours passed to most menu constructors (just passed to functions, not 
// a global variable - makes things easier to change later). 
var defOver = '#336699', defBack = '#003366', defBorder = '#000000'; 
// Default height of menu items - the spacing to the next item, actually. 
var defHeight = 22; 
// Menu 0 is the special, 'root' menu from which everything else arises. 
menu[0] = new Array(); 
// Pass a few different colours, as an example. 
menu[0][0] = new Menu('rootMenu', 0, 0, 80, '#669999', '#006666', defBorder); 
// Notice how the targets are all set to nonzero values... 
menu[0][1] = new Item('File', '#', defHeight, 1); 
menu[0][2] = new Item('Edit', '#', defHeight, 2); 
menu[0][3] = new Item('Help', '#', defHeight, 3); 
menu[1] = new Array(); 
// The File menu is positioned 0px across and 22 down from its trigger, and is 80 wide. 
menu[1][0] = new Menu('fileMenu', 0, 22, 80, defOver, defBack, defBorder); 
menu[1][1] = new Item('Open', '#', defHeight, 0); 
menu[1][2] = new Item('Save', '#', defHeight, 0); 
// Non-zero target means this will trigger a popup. 
menu[1][3] = new Item('Reopen', '#', defHeight, 4); 
menu[1][4] = new Item('Exit', '#', defHeight, 0); 
menu[2] = new Array(); 
menu[2][0] = new Menu('editMenu', 0, 22, 80, defOver, defBack, defBorder); 
menu[2][1] = new Item('Cut', '#', defHeight, 0); 
menu[2][2] = new Item('Copy', '#', defHeight, 0); 
menu[2][3] = new Item('Paste', '#', defHeight, 0); 
menu[3] = new Array(); 
menu[3][0] = new Menu('helpMenu', 0, 22, 80, defOver, defBack, defBorder); 
menu[3][1] = new Item('Contents', '#', defHeight, 0); 
menu[3][2] = new Item('Index', '#', defHeight, 0); 
menu[3][3] = new Item('About', '#', defHeight, 5); 
menu[4] = new Array(); 
// This is across but not down... a horizontal popout (with crazy colours :)... 
menu[4][0] = new Menu('reopenMenu', 85, 0, 100, '#333366', '#666699', '#663399'); 
menu[4][1] = new Item('Recent Doc 1: 
Schedule', '#', 36, 0); 
menu[4][2] = new Item('Recent Doc 2: 
Plan', '#', 40, 0); 
menu[4][3] = new Item('Etc. etc...', '#', defHeight, 0); 
menu[5] = new Array(); 
// Leftwards popout with a negative x relative to its trigger. 
menu[5][0] = new Menu('aboutMenu', -85, -15, 80, defOver, defBack, defBorder); 
menu[5][1] = new Item('Leftwards! 
And up!', '#', 30, 0); 
// Now, this next bit of script will write our own custom root menu -- a horizontal 
// one, as the defaults are all vertical with borders. Even if you are writing your 
// own root menu, you must still specify the names, colours and targets above -- the 
// positions are calculated on the fly and hence are ignored. 
// Basically, you must duplicate the output of the writeMenus() function. Just work 
// from this example. 
// Syntax: startDL('id', x, y, width, height, 'visibility', '#background colour or null 
//for transparent', '#border colour or null for no border', 'additional properties'); 
// It returns a string of HTML text comprising the opening tag of a div or layer. 
// mouseProps(menu, item) returns the 'onMouseEvent' properties for a specific menu item, 
// passed as 'additional properties' to startDL. Just cut and paste below, or allow the 
// script to write its own root menu. 
// endDL is a variable containing either '</div>' or '</layer>', so add it afterwards. 
newRoot = startDL('rootMenu', 0, 0, '100%', 17, 'hidden', '#006666', null, 100, ''); 
newRoot += startDL('rootMenu1', 5, 0, 40, 17, 'inherit', '#006666', null, 100, mouseProps(0, 1)); 
newRoot += '<span class="Item"> File</span>' + endDL; 
newRoot += startDL('rootMenu2', 55, 0, 40, 17, 'inherit', '#006666', null, 100, mouseProps(0, 2)); 
newRoot += '<span class="Item"> Edit</span>' + endDL; 
newRoot += startDL('rootMenu3', 105, 0, 40, 17, 'inherit', '#006666', null, 100, mouseProps(0, 3)); 
newRoot += '<span class="Item"> Help</span>' + endDL; 
newRoot += endDL; 
// Pass this two strings - the first is HTML to write a custom root menu, or null to 
// generate one normally. The second is the popout indicator HTML - try an image...? 
// Try writeMenus(null, '<img src="...">'); in your own script. 
writeMenus(newRoot, '>'); 
// This is a quick snippet that captures all clicks on the document and hides the menus 
// every time you click. Use if you want. 
if (isNS4) document.captureEvents(Event.CLICK); 
document.onclick = clickHandle; 
function clickHandle(evt) { 
if (isNS4) document.routeEvent(evt); 
hideAllBut(0); 
} 
// Show root menu command - place in an onLoad="..." type function if you want. 
eval(docObj + menu[0][0].id + styObj + '.visibility = "visible"'); 
// This is just the moving command for the example. 
function moveRoot() { 
rM = eval(docObj + menu[0][0].id + styObj); 
if (parseInt(rM.top) < 40) rM.top = 40; 
else rM.top = 0; 
} 
// End --> 
&lt;/script&gt; 
</body>
this script was written by:Angus Turnbull