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출처: http://www.dynamicdrive.com/style/csslibrary/item/suckertree-menu-vertical/

SuckerTree Vertical Menu (v1.1)

Author: Dynamic Drive

Nov 8th, 06: Fixed rendering issue in IE7, plus added support for automatic detection of sub menus width. No more configuring the "left" attributes!

This is a vertical, predominantly CSS based (with a touch of JavaScript) multi-level menu. It supports as many sub levels as you desire, plus multiple Suckertree menus on the same page. The CSS and JavaScript automatically adopts to your HTML code in each case.

The trick to Suckertree is a small adoptable piece of JavaScript that crawls the inner levels of a list menu and assigns the appropriate show/hide behavior to them. This differs from Suckerfish menu, which merely uses JavaScript to compensate for IE's shortcomings when it comes to CSS, so the menu is more rigid and requires manual changes to the CSS as the number of levels in your menu changes.

The CSS:

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<style type="text/css"> /*Credits: Dynamic Drive CSS Library */ /*URL: http://www.dynamicdrive.com/style/ */ .suckerdiv ul{ margin: 0; padding: 0; list-style-type: none; width: 160px; /* Width of Menu Items */ border-bottom: 1px solid #ccc; } .suckerdiv ul li{ position: relative; } /*Sub level menu items */ .suckerdiv ul li ul{ position: absolute; width: 170px; /*sub menu width*/ top: 0; visibility: hidden; } /* Sub level menu links style */ .suckerdiv ul li a{ display: block; overflow: auto; /*force hasLayout in IE7 */ color: black; text-decoration: none; background: #fff; padding: 1px 5px; border: 1px solid #ccc; border-bottom: 0; } .suckerdiv ul li a:visited{ color: black; } .suckerdiv ul li a:hover{ background-color: yellow; } .suckerdiv .subfolderstyle{ background: url(media/arrow-list.gif) no-repeat center right; } /* Holly Hack for IE \*/ * html .suckerdiv ul li { float: left; height: 1%; } * html .suckerdiv ul li a { height: 1%; } /* End */ </style> <script type="text/javascript"> //SuckerTree Vertical Menu 1.1 (Nov 8th, 06) //By Dynamic Drive: http://www.dynamicdrive.com/style/ var menuids=["suckertree1"] //Enter id(s) of SuckerTree UL menus, separated by commas function buildsubmenus(){ for (var i=0; i<menuids.length; i++){ var ultags=document.getElementById(menuids[i]).getElementsByTagName("ul") for (var t=0; t<ultags.length; t++){ ultags[t].parentNode.getElementsByTagName("a")[0].className="subfolderstyle" if (ultags[t].parentNode.parentNode.id==menuids[i]) //if this is a first level submenu ultags[t].style.left=ultags[t].parentNode.offsetWidth+"px" //dynamically position first level submenus to be width of main menu item else //else if this is a sub level submenu (ul) ultags[t].style.left=ultags[t-1].getElementsByTagName("a")[0].offsetWidth+"px" //position menu to the right of menu item that activated it ultags[t].parentNode.onmouseover=function(){ this.getElementsByTagName("ul")[0].style.display="block" } ultags[t].parentNode.onmouseout=function(){ this.getElementsByTagName("ul")[0].style.display="none" } } for (var t=ultags.length-1; t>-1; t--){ //loop through all sub menus again, and use "display:none" to hide menus (to prevent possible page scrollbars ultags[t].style.visibility="visible" ultags[t].style.display="none" } } } if (window.addEventListener) window.addEventListener("load", buildsubmenus, false) else if (window.attachEvent) window.attachEvent("onload", buildsubmenus) </script>

The HTML:

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<div class="suckerdiv"> <ul id="suckertree1"> <li><a href="#">Item 1</a></li> <li><a href="#">Item 2</a></li> <li><a href="#">Folder 1</a> <ul> <li><a href="#">Sub Item 1.1</a></li> <li><a href="#">Sub Item 1.2</a></li> </ul> </li> <li><a href="#">Item 3</a></li> <li><a href="#">Folder 2</a> <ul> <li><a href="#">Sub Item 2.1</a></li> <li><a href="#">Folder 2.1</a> <ul> <li><a href="#">Sub Item 2.1.1</a></li> <li><a href="#">Sub Item 2.1.2</a></li> <li><a href="#">Sub Item 2.1.3</a></li> <li><a href="#">Sub Item 2.1.4</a></li> </ul> </li> </ul> </li> <li><a href="#">Item 4</a></li> </ul> </div>