plone_menu.js

// Do *NOT* depend on this menu code, it *will* be rewritten in later versions
// of Plone. This is a quick fix that will be replaced with something more
// elegant later.

/* <!-- compression status: 1 --> (this is for http compression) */

/*




*/
// Code to determine the browser and version.

function Browser() {
    var ua, s, i;
    
    this.isIE = false; // Internet Explorer
    this.isNS = false; // Netscape
    this.version = null;
    
    ua = navigator.userAgent;
    
    s = "MSIE";
    if ((i = ua.indexOf(s)) >= 0) {
        this.isIE = true;
        this.version = parseFloat(ua.substr(i + s.length));
        return;
    }  
    s = "Netscape6/";
    if ((i = ua.indexOf(s)) >= 0) {
        this.isNS = true;
        this.version = parseFloat(ua.substr(i + s.length));
        return;
    }
    
    // Treat any other "Gecko" browser as NS 6.1.
    
    s = "Gecko";
    if ((i = ua.indexOf(s)) >= 0) {
        this.isNS = true;
        this.version = 6.1;
        return;
    }
}
var browser = new Browser();

// Code for handling the menu bar and active button.
var activeButton = null;

// Capture mouse clicks on the page so any active button can be
// deactivated.

if (browser.isIE){
    document.onmousedown = pageMousedown;
}else{
    document.addEventListener("mousedown", pageMousedown, true);
}

function pageMousedown(event) {
    
    var el;
    
    // If there is no active button, exit.
    
    if (activeButton == null){
        return;
        }
    
    // Find the element that was clicked on.
    
    if (browser.isIE){
        el = window.event.srcElement;
    }else{
        el = (event.target.tagName ? event.target : event.target.parentNode);
    }
    // If the active button was clicked on, exit.
    
    if (el == activeButton){
        return
        };
    
    // If the element is not part of a menu, reset and clear the active
    // button.
    
    if (getContainerWith(el, "UL", "actionMenu") == null) {
        resetButton(activeButton);
        activeButton = null;
    }
}

function buttonClick(event, menuId) {
    
    var button;
    
    // Get the target button element.
    
    if (browser.isIE){
        button = window.event.srcElement;
    }else{
        if (event)
          button = event.currentTarget;
        else
          return false;
    }
    // Blur focus from the link to remove that annoying outline.
    
    button.blur();
    
    // Associate the named menu to this button if not already done.
    // Additionally, initialize menu display.
    
    if (button.menu == null) {
        button.menu = document.getElementById(menuId);
        if (button.menu.isInitialized == null) {
            menuInit(button.menu);
        }
    }
    
    // Reset the currently active button, if any.
    
    if (activeButton != null){
        resetButton(activeButton);
        }
    // Activate this button, unless it was the currently active one.
    
    if (button != activeButton) {
        depressButton(button);
        activeButton = button;
    }else{
        activeButton = null;
    }
    return false;
}

function buttonMouseover(event, menuId) {

    var button;
    
    // Find the target button element.
    
    if (browser.isIE){
        button = window.event.srcElement;
    }else{
        button = event.currentTarget;
    }
    // If any other button menu is active, make this one active instead.
    
    if (activeButton != null && activeButton != button){
        buttonClick(event, menuId);
        }
}

function depressButton(button) {

    var x, y;
    
    // Update the button's style class to make it look like it's
    // depressed.
    
    button.className += " menuButtonActive";
    
    // Make the associated drop down menu visible
    
    vis = button.menu.style.visibility;
    button.menu.style.visibility = (vis == "hidden" || vis == '') ? "visible" : "hidden";
}

function resetButton(button) {

    // Restore the button's style class.
    
    removeClassName(button, "menuButtonActive");
    
    // Hide the button's menu, first closing any sub menus.
    
    if (button.menu != null) {
        closeSubMenu(button.menu);
        button.menu.style.visibility = "hidden";
    }
}

// Code to handle the menus and sub menus.

function menuMouseover(event) {
    
    var menu;
    
    // Find the target menu element.
    
    if (browser.isIE){
        menu = getContainerWith(window.event.srcElement, "UL", "actionMenu");
    }else{
        menu = event.currentTarget;
    }
    
    // Close any active sub menu.
    
    if (menu.activeItem != null){
        closeSubMenu(menu);
        }
}

function menuItemMouseover(event, menuId) {

    var item, menu, x, y;
    
    // Find the target item element and its parent menu element.
    
    if (browser.isIE){
        item = getContainerWith(window.event.srcElement, "LI", "menuItem");
    }else{
        item = event.currentTarget;
        menu = getContainerWith(item, "UL", "menu");
    }
    // Close any active sub menu and mark this one as active.
    
    if (menu.activeItem != null){
        closeSubMenu(menu);
        menu.activeItem = item;
    }
    
    // Highlight the item element.
    
    item.className += " menuItemHighlight";
    
    // Initialize the sub menu, if not already done.
    
    if (item.subMenu == null) {
        item.subMenu = document.getElementById(menuId);
        if (item.subMenu.isInitialized == null){
            menuInit(item.subMenu);
            }
    }
    
    // Get position for submenu based on the menu item.
    
    x = getPageOffsetLeft(item) + item.offsetWidth;
    y = getPageOffsetTop(item);
    
    // Adjust position to fit in view.
    
    var maxX, maxY;
    
    if (browser.isNS) {
        maxX = window.scrollX + window.innerWidth;
        maxY = window.scrollY + window.innerHeight;
    }
    else if (browser.isIE) {
        maxX = (document.documentElement.scrollLeft != 0 ? document.documentElement.scrollLeft : document.body.scrollLeft)
        + (document.documentElement.clientWidth != 0 ? document.documentElement.clientWidth : document.body.clientWidth);
        maxY = (document.documentElement.scrollTop != 0 ? document.documentElement.scrollTop : document.body.scrollTop)
        + (document.documentElement.clientHeight != 0 ? document.documentElement.clientHeight : document.body.clientHeight);
    }
    maxX -= item.subMenu.offsetWidth;
    maxY -= item.subMenu.offsetHeight;
    
    if (x > maxX){
        x = Math.max(0, x - item.offsetWidth - item.subMenu.offsetWidth  + (menu.offsetWidth - item.offsetWidth));
        y = Math.max(0, Math.min(y, maxY));
    }
    // Position and show it.
    
    item.subMenu.style.left = x + "px";
    item.subMenu.style.top = y + "px";
    item.subMenu.style.visibility = "visible";
    
    // Stop the event from bubbling.
    
    if (browser.isIE){
        window.event.cancelBubble = true;
    }else{
        event.stopPropagation();
    }
}

function closeSubMenu(menu) {
    
    if (menu == null || menu.activeItem == null)
    return;
    
    // Recursively close any sub menus.
    
    if (menu.activeItem.subMenu != null) {
    closeSubMenu(menu.activeItem.subMenu);
    menu.activeItem.subMenu.style.visibility = "hidden";
    menu.activeItem.subMenu = null;
    }
    removeClassName(menu.activeItem, "menuItemHighlight");
    menu.activeItem = null;
}

// Code to initialize menus.

function menuInit(menu) {
    
    var itemList, spanList;
    var textEl, arrowEl;
    var itemWidth;
    var w, dw;
    var i, j;
    
    // For IE, replace arrow characters.
    
    if (browser.isIE) {
        menu.style.lineHeight = "2.5ex";
        spanList = menu.getElementsByTagName("SPAN");
        for (i = 0; i < spanList.length; i++)
        if (hasClassName(spanList[i], "menuItemArrow")) {
        spanList[i].style.fontFamily = "Webdings";
        spanList[i].firstChild.nodeValue = "4";
    }
}

// Find the width of a menu item.

itemList = menu.getElementsByTagName("A");
if (itemList.length > 0){
    itemWidth = itemList[0].offsetWidth;
}else{
    return;
}
// For items with arrows, add padding to item text to make the
// arrows flush right.

for (i = 0; i < itemList.length; i++) {
    spanList = itemList[i].getElementsByTagName("A");
    textEl = null;
    arrowEl = null;
    for (j = 0; j < spanList.length; j++) {
    if (hasClassName(spanList[j], "menuItemText")){
        textEl = spanList[j];
        }
    if (hasClassName(spanList[j], "menuItemArrow")){
        arrowEl = spanList[j];
        }
    }
    if (textEl != null && arrowEl != null){
    textEl.style.paddingRight = (itemWidth - (textEl.offsetWidth + arrowEl.offsetWidth)) + "px";
    }
}

// Fix IE hover problem by setting an explicit width on first item of
// the menu.

if (browser.isIE) {
    w = itemList[0].offsetWidth;
    itemList[0].style.width = w + "px";
    dw = itemList[0].offsetWidth - w;
    w -= dw;
    itemList[0].style.width = w + "px";
}

// Mark menu as initialized.

menu.isInitialized = true;
}

// General utility functions.

    function getContainerWith(node, tagName, className) {
    
    // Starting with the given node, find the nearest containing element
    // with the specified tag name and style class.
    
    while (node != null) {
        if (node.tagName != null && node.tagName == tagName && hasClassName(node, className)){
            return node;
    }
    node = node.parentNode;
    }
    return node;
}

    function hasClassName(el, name) {
    
    var i, list;
    
    // Return true if the given element currently has the given class
    // name.
    
    list = el.className.split(" ");
    for (i = 0; i < list.length; i++)
    if (list[i] == name){
        return true;
        }
    return false;
}

function removeClassName(el, name) {
    
    var i, curList, newList;
    
    if (el.className == null){
        return;
        }
    // Remove the given class name from the element's className property.
    
    newList = new Array();
    curList = el.className.split(" ");
    for (i = 0; i < curList.length; i++){
        if (curList[i] != name){
            newList.push(curList[i]);
            el.className = newList.join(" ");
        }
    }
}
function getPageOffsetLeft(el) {

var x;

// Return the x coordinate of an element relative to the page.

x = el.offsetLeft;
if (el.offsetParent != null)
x += getPageOffsetLeft(el.offsetParent);

return x;
}

function getPageOffsetTop(el) {
    
    var y;
    
    // Return the x coordinate of an element relative to the page.
    
    y = el.offsetTop;
    if (el.offsetParent != null){
        y += getPageOffsetTop(el.offsetParent);
    }
    return y;
}