/****************************************************************************** * treeMenuCode.js * * * * Copyright 1999 by Mike Hall. * * Web address: http://www.brainjar.com * * Last update: October 11, 1999 * * * * Creates an expanding and collapsing menu with files and folders in a child * * frame. * ******************************************************************************/ //---------------------------------------------------------------------------- // Define the TreeMenuItem object. //---------------------------------------------------------------------------- // Global index variable. var treeMenuIndex = 0; // Constructor. function TreeMenuItem(text, url, target, icon) { this.text = text; if (url) this.url = url; else this.url = ""; if (target) this.target = target; else this.target = ""; if (icon) this.icon = icon; else this.icon = ""; this.submenu = null; this.index = treeMenuIndex++; this.makeSubmenu = TreeMenuMakeSubmenu; } // Methods. function TreeMenuMakeSubmenu(menu) { this.submenu = menu; } //---------------------------------------------------------------------------- // Define the TreeMenu object. //---------------------------------------------------------------------------- // Constructor. function TreeMenu() { this.items = new Array(); this.addItem = treeMenuAddItem; } // Methods. function treeMenuAddItem(item) { this.items[this.items.length] = item; } //---------------------------------------------------------------------------- // Global variables used in drawing the menu. //---------------------------------------------------------------------------- var treeMenuDocument; // Handle to the menu frame document. var treeMenuWidth; // Menu width in pixels. var treeMenuExpand; // Array created from first cookie. var treeMenuSelected; // Index of selected menu item from other cookie. var treeMenuSelectedFound; // Indicates if we've displayed the selected item. var treeMenuScrollX; // Amount to scroll the window right, if needed. var treeMenuScrollY; // Amount to scroll the window down, if needed. var treeMenuLastItem; // Flag indicating if we are on a menu's last item. var treeMenuDepth; // Keeps track the current menu level. var treeMenuBars; // Keeps track of image placement from row to row. //---------------------------------------------------------------------------- // This function rewrites the menu document to display the menu. //---------------------------------------------------------------------------- function treeMenuDisplay() { var i, cookie; // Check for cookies with the menu state data. If not found, or if the menu // state has not been set, initialize it. cookie = getCookie(treeMenuName); if (!cookie) { if (!treeMenuExpand) { treeMenuExpand = new Array(); for (i = 0; i < treeMenuIndex; i++) treeMenuExpand[i] = 0; treeMenuSelected = -1; } } else { treeMenuExpand = cookie.split(","); cookie = getCookie(treeMenuName + "-selected"); if (!cookie) treeMenuSelected = -1; else treeMenuSelected = cookie; } // Set up reference to the menu document. treeMenuDocument = parent.frames[treeMenuFrame].document; // Set global variables used to draw the menu. treeMenuDepth = 0; treeMenuBars = new Array(); // Intialize scrolling data. treeMenuSelectedFound = false; treeMenuScrollX = 36; treeMenuScrollY = 18; // Draw the menu. if (document.images) treeMenuDocument.open("text/html", "replace"); else treeMenuDocument.open("text/html"); treeMenuDocument.writeln(''); treeMenuDocument.writeln('' + treeMenuRoot + ''); treeMenuDocument.writeln(''); treeMenuDocument.writeln(''); treeMenuDocument.writeln('
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'); treeMenuDocument.writeln(''); treeMenuDocument.write(''); treeMenuListItems(treeMenu); treeMenuDocument.writeln('
'); treeMenuDocument.write(''); treeMenuDocument.write(''); treeMenuDocument.write(' ' + treeMenuRoot + ' '); treeMenuDocument.writeln('
'); treeMenuDocument.writeln(''); treeMenuDocument.close(); } //---------------------------------------------------------------------------- // This function displays each item in the given menu or submenu. //---------------------------------------------------------------------------- function treeMenuListItems(menu) { var i; for (i = 0; i < menu.items.length; i++) { if (i == menu.items.length - 1) treeMenuLastItem = true; else treeMenuLastItem = false; treeMenuDisplayItem(menu.items[i]); } } //---------------------------------------------------------------------------- // This displays a single menu or submenu item. //---------------------------------------------------------------------------- function treeMenuDisplayItem(item) { var bars, cmd, expanded, i, img, alt, link, more, submenu; // Update vertical scrolling amount until we find the selected item. if (item.index == treeMenuSelected) treeMenuSelectedFound = true; if (!treeMenuSelectedFound) treeMenuScrollY += 18; // If this item is a submenu, determine if should be expanded. For older // browsers, always expand. if (treeMenuExpand[item.index] == 1) expanded = true; else expanded = false; // Define the command used when an item is clicked. For older browsers, just // return true or false so links will be followed. if (item.submenu) submenu = true; else submenu = false; if (item.url != "") link = true; else link = false; cmd = "return parent.treeMenuClick(" + item.index + ", " + link + ", " + submenu + ");"; // Start the table row. treeMenuDocument.write(''); // Draw descending bars from upper levels, also set horizontal scrolling // amount if this is the selected item. bars = new Array(); for (i = 0; i < treeMenuDepth; i++) { if (treeMenuBars[i]) { treeMenuDocument.write(''); bars[i] = true; } else { treeMenuDocument.write(''); bars[i] = false; } if (item.index == treeMenuSelected) treeMenuScrollX += 18; } // Determine if this is a submenu item that contains other submenus. more = false; if (item.submenu && treeMenuFolders >= 0) for (i = 0; i < item.submenu.items.length; i++) if (item.submenu.items[i].submenu != null || treeMenuFolders == 1) more = true; // Draw tee bar or corner if this item is not a submenu or if it is a // submenu but doesn't contain other submenus. if (!more) { if (treeMenuLastItem) { img = "menu_corner.gif"; bars[bars.length] = false; } else { img = "menu_tee.gif"; bars[bars.length] = true; } treeMenuDocument.write(''); } // Write the start of the link tag so all of the following images and text // will be clickable. if (item.url != "") treeMenuDocument.write(''); else treeMenuDocument.write(''); // For a submenu item that contains other submenus, draw a tee bar or corner // with a plus or minus sign. if (more) { if (expanded) { if (treeMenuLastItem) { img = "menu_corner_minus.gif"; bars[bars.length] = false; } else { img = "menu_tee_minus.gif"; bars[bars.length] = true; } } else { if (treeMenuLastItem) { img = "menu_corner_plus.gif"; bars[bars.length] = false; } else { img = "menu_tee_plus.gif"; bars[bars.length] = true; } } treeMenuDocument.write(''); } // If the item is a submenu, draw an open or closed folder icon. Otherwise // draw a link icon. if (item.submenu) { if (expanded) img = "menu_folder_open.gif"; else img = "menu_folder_closed.gif"; } else { if (item.icon != "") img = item.icon; else if (item.url.indexOf("http://") == 0) img = "menu_link_external.gif"; else img = "menu_link_local.gif"; } if (treeMenuAltText) alt = ' alt="' + item.text + '"'; else alt = ''; treeMenuDocument.write(''); // Write the link text and finish the link and table row. if (item.index == treeMenuSelected) treeMenuDocument.write(' ' + item.text + ''); else treeMenuDocument.write(' ' + item.text + ''); treeMenuDocument.write(''); treeMenuDocument.writeln(''); // Set the placement of vertical bars needed for the next row. treeMenuBars = bars; // If the item is a submenu and it is expanded, make a recursive call to // draw its item list. if (item.submenu && expanded) { treeMenuDepth++; treeMenuListItems(item.submenu); treeMenuDepth--; } } //---------------------------------------------------------------------------- // This function handles a click on a menu item. //---------------------------------------------------------------------------- function treeMenuClick(n, link, submenu) { var date, cookie; // Fix bug that occurs when the top-level page is reloaded. if (!treeMenuExpand) treeMenuDisplay(); // If this is a submenu, toggle the expansion flag. if (submenu) treeMenuExpand[n] = 1 - treeMenuExpand[n]; // Save the selected item index and update the cookies. treeMenuSelected = n; var date = new Date (); date.setTime (date.getTime() + (86400 * 1000 * treeMenuDays)); cookie = treeMenuExpand.toString(); setCookie(treeMenuName, cookie, date) setCookie(treeMenuName + "-selected", treeMenuSelected, date) // Set up redraw the menu frame. setTimeout("treeMenuDisplay()", 10); // Return the link flag. return link; } //---------------------------------------------------------------------------- // This function handles a click on the menu root. //---------------------------------------------------------------------------- function treeMenuClickRoot() { // Clear the menu state. treeMenuExpand = null; treeMenuSelected = null; // Delete cookies. deleteCookie(treeMenuName); deleteCookie(treeMenuName + "-selected"); // Set up redraw the menu frame. setTimeout("treeMenuDisplay()", 10); return false; } //---------------------------------------------------------------------------- // This function scrolls the window to ensure the selected item is in view. // It should only be called after the page has loaded. // // Note: This code is browser-dependent. Scrolling may be ignored for older // browsers. //---------------------------------------------------------------------------- function treeMenuScroll() { var win, height, width; // Get a handle to the menu frame. win = parent.frames[treeMenuFrame]; // Find the dimensions of the frame. if (document.layers) { height = win.innerHeight; width = win.innerWidth; } else if (document.all) { height = win.document.body.clientHeight; width = win.document.body.clientWidth; } else if (document.images) { win.scroll(0, treeMenuScrollY); return; } else return; // Scroll the frame if necessary. if (treeMenuScrollY > height) win.scrollBy(0, treeMenuScrollY); if (treeMenuScrollX > width) win.scrollBy(treeMenuScrollX, 0); } //---------------------------------------------------------------------------- // Set a cookie given a name, value and expiration date. //---------------------------------------------------------------------------- function setCookie (name, value, expires) { document.cookie = name + "=" + escape(value) + "; expires=" + expires.toGMTString() + "; path=/"; } //---------------------------------------------------------------------------- // Returns the value of the named cookie. //---------------------------------------------------------------------------- function getCookie(name) { var search; search = name + "=" offset = document.cookie.indexOf(search) if (offset != -1) { offset += search.length ; end = document.cookie.indexOf(";", offset) ; if (end == -1) end = document.cookie.length; return unescape(document.cookie.substring(offset, end)); } else return ""; } //---------------------------------------------------------------------------- // Delete the named cookie. //---------------------------------------------------------------------------- function deleteCookie(name) { var expdate = new Date(); expdate.setTime(expdate.getTime() - (86400 * 1000 * 1)); setCookie(name, "", expdate); }