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jquery做menu

 叫天 2011-10-18
html页面代码：
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www./TR/xhtml2/DTD/xhtml1-strict.dtd">
<html xmlns="http://www./1999/xhtml" xml:lang="en">

<head>

<script type="text/javascript" src="jquery-1.4.2.min.js"></script>
<script type="text/javascript" src="ddaccordion.js"></script>
<script type="text/javascript">
ddaccordion.init({
headerclass: "expandable", //Shared CSS class name of headers group that are expandable
contentclass: "categoryitems", //Shared CSS class name of contents group
revealtype: "click", //Reveal content when user clicks or onmouseover the header? Valid value: "click", "clickgo", or "mouseover"
mouseoverdelay: 200, //if revealtype="mouseover", set delay in milliseconds before header expands onMouseover
collapseprev: true, //Collapse previous content (so only one open at any time)? true/false 
defaultexpanded: [0], //index of content(s) open by default [index1, index2, etc]. [] denotes no content
onemustopen: false, //Specify whether at least one header should be open always (so never all headers closed)
animatedefault: false, //Should contents open by default be animated into view?
persiststate: true, //persist state of opened contents within browser session?
toggleclass: ["", "openheader"], //Two CSS classes to be applied to the header when it's collapsed and expanded, respectively ["class1", "class2"]
togglehtml: ["prefix", "", ""], //Additional HTML added to the header when it's collapsed and expanded, respectively  ["position", "html1", "html2"] (see docs)
animatespeed: "fast", //speed of animation: integer in milliseconds (ie: 200), or keywords "fast", "normal", or "slow"
oninit:function(headers, expandedindices){ //custom code to run when headers have initalized
//do nothing
},
onopenclose:function(header, index, state, isuseractivated){ //custom code to run whenever a header is opened or closed
//do nothing
}
})
</script>


<style>
  .arrowlistmenu{
     width:200px;
border:1px solid #000;

  }
  .menuheader{
    background-color:#cccc33;
width:200px;
border:1px solid #000;
  }
  ul{
  list-style-type: none;
  margin:0;
  padding:0;
  }
  li{
    background-color:#c0c0c0;

  }
</style>
</head>

<body>

<div class="arrowlistmenu" >

<div class="menuheader expandable">CSS Library</div>
<ul class="categoryitems">
<li><a href="http://www./style/csslibrary/category/C1/">Horizontal CSS Menus</a></li>
<li><a href="http://www./style/csslibrary/category/C2/">Vertical CSS Menus</a></li>
<li><a href="http://www./style/csslibrary/category/C4/">Image CSS</a></li>
<li><a href="http://www./style/csslibrary/category/C6/">Form CSS</a></li>
<li><a href="http://www./style/csslibrary/category/C5/">DIVs and containers</a></li>
<li><a href="http://www./style/csslibrary/category/C7/">Links & Buttons</a></li>
<li><a href="http://www./style/csslibrary/category/C8/">Other</a></li>
<li><a href="http://www./style/csslibrary/all/">Browse All</a></li>
</ul>

<div class="menuheader expandable">CSS Drive</div>
<ul class="categoryitems">
<li><a href="http://www.">CSS Gallery</a></li>
<li><a href="http://www./index.php/menudesigns/">Menu Gallery</a></li>
<li><a href="http://www./index.php/news/">Web Design News</a></li>
<li><a href="http://www./index.php/examples/">CSS Examples</a></li>
<li><a href="http://www./index.php/main/csscompressor/">CSS Compressor</a></li>
<li><a href="http://www./forums/forumdisplay.php?f=6">CSS Forums</a></li>
</ul>

<div class="menuheader expandable">JavaScript Kit</div>
<ul class="categoryitems">
<li><a href="http://www./cutpastejava.shtml" >Free JavaScripts</a></li>
<li><a href="http://www./javatutors/">JavaScript tutorials</a></li>
<li><a href="http://www./jsref/">JavaScript Reference</a></li>
<li><a href="http://www./domref/">DOM Reference</a></li>
<li><a href="http://www./dhtmltutors/">DHTML & CSS</a></li>
</ul>

    <div class="menuheader" style="cursor: default">FeedBack</div>

</div>
</body>
</html>
需要两个js包：jquery.js，还有ddaccordion.js
//** Accordion Content script: By Dynamic Drive, at http://www.
//** Created: Jan 7th, 08'. Last updated: June 7th, 2010 to v1.9

//Version 1.9: June 7th, 2010':
//**1) Ajax content support added, so a given header's content can be dynamically fetched from an external file and on demand.
//**2) Optimized script performance by caching header and content container references


var ddaccordion={
ajaxloadingmsg: '<img src="loading2.gif" /><br />Loading Content...', //customize HTML to output while Ajax content is being fetched (if applicable)

headergroup: {}, //object to store corresponding header group based on headerclass value
contentgroup: {}, //object to store corresponding content group based on headerclass value

preloadimages:function($images){
$images.each(function(){
var preloadimage=new Image()
preloadimage.src=this.src
})
},

expandone:function(headerclass, selected){ //PUBLIC function to expand a particular header
this.toggleone(headerclass, selected, "expand")
},

collapseone:function(headerclass, selected){ //PUBLIC function to collapse a particular header
this.toggleone(headerclass, selected, "collapse")
},

expandall:function(headerclass){ //PUBLIC function to expand all headers based on their shared CSS classname
var $headers=this.headergroup[headerclass]
this.contentgroup[headerclass].filter(':hidden').each(function(){
$headers.eq(parseInt($(this).attr('contentindex'))).trigger("evt_accordion")
})
},

collapseall:function(headerclass){ //PUBLIC function to collapse all headers based on their shared CSS classname
var $headers=this.headergroup[headerclass]
this.contentgroup[headerclass].filter(':visible').each(function(){
$headers.eq(parseInt($(this).attr('contentindex'))).trigger("evt_accordion")
})
},

toggleone:function(headerclass, selected, optstate){ //PUBLIC function to expand/ collapse a particular header
var $targetHeader=this.headergroup[headerclass].eq(selected)
var $subcontent=this.contentgroup[headerclass].eq(selected)
if (typeof optstate=="undefined" || optstate=="expand" && $subcontent.is(":hidden") || optstate=="collapse" && $subcontent.is(":visible"))
$targetHeader.trigger("evt_accordion")
},

ajaxloadcontent:function($targetHeader, $targetContent, config, callback){
var ajaxinfo=$targetHeader.data('ajaxinfo')

function handlecontent(content){ //nested function
if (content){ //if ajax content has loaded
ajaxinfo.cacheddata=content //remember ajax content 
ajaxinfo.status="cached" //set ajax status to cached
if ($targetContent.queue("fx").length==0){ //if this content isn't currently expanding or collapsing
$targetContent.hide().html(content) //hide loading message, then set sub content's HTML to ajax content
ajaxinfo.status="complete" //set ajax status to complete
callback() //execute callback function- expand this sub content
}
}
if (ajaxinfo.status!="complete"){
setTimeout(function(){handlecontent(ajaxinfo.cacheddata)}, 100) //call handlecontent() again until ajax content has loaded (ajaxinfo.cacheddata contains data)
}
} //end nested function

if (ajaxinfo.status=="none"){ //ajax data hasn't been fetched yet
$targetContent.html(this.ajaxloadingmsg)
$targetContent.slideDown(config.animatespeed)
ajaxinfo.status="loading" //set ajax status to "loading"
$.ajax({
url: ajaxinfo.url, //path to external menu file
error:function(ajaxrequest){
handlecontent('Error fetching content. Server Response: '+ajaxrequest.responseText)
},
success:function(content){
content=(content=="")? " " : content //if returned content is empty, set it to "space" is content no longer returns false/empty (hasn't loaded yet)
handlecontent(content)
}
})
}
else if (ajaxinfo.status=="loading")
handlecontent(ajaxinfo.cacheddata)
},

expandit:function($targetHeader, $targetContent, config, useractivated, directclick, skipanimation){
var ajaxinfo=$targetHeader.data('ajaxinfo')
if (ajaxinfo){ //if this content should be fetched via Ajax
if (ajaxinfo.status=="none" || ajaxinfo.status=="loading")
this.ajaxloadcontent($targetHeader, $targetContent, config, function(){ddaccordion.expandit($targetHeader, $targetContent, config, useractivated, directclick)})
else if (ajaxinfo.status=="cached"){
$targetContent.html(ajaxinfo.cacheddata)
ajaxinfo.cacheddata=null
ajaxinfo.status="complete"
}
}
this.transformHeader($targetHeader, config, "expand")
$targetContent.slideDown(skipanimation? 0 : config.animatespeed, function(){
config.onopenclose($targetHeader.get(0), parseInt($targetHeader.attr('headerindex')), $targetContent.css('display'), useractivated)
if (config.postreveal=="gotourl" && directclick){ //if revealtype is "Go to Header URL upon click", and this is a direct click on the header
var targetLink=($targetHeader.is("a"))? $targetHeader.get(0) : $targetHeader.find('a:eq(0)').get(0)
if (targetLink) //if this header is a link
setTimeout(function(){location=targetLink.href}, 200) //ignore link target, as window.open(targetLink, targetLink.target) doesn't work in FF if popup blocker enabled
}
})
},

collapseit:function($targetHeader, $targetContent, config, isuseractivated){
this.transformHeader($targetHeader, config, "collapse")
$targetContent.slideUp(config.animatespeed, function(){config.onopenclose($targetHeader.get(0), parseInt($targetHeader.attr('headerindex')), $targetContent.css('display'), isuseractivated)})
},

transformHeader:function($targetHeader, config, state){
$targetHeader.addClass((state=="expand")? config.cssclass.expand : config.cssclass.collapse) //alternate btw "expand" and "collapse" CSS classes
.removeClass((state=="expand")? config.cssclass.collapse : config.cssclass.expand)
if (config.htmlsetting.location=='src'){ //Change header image (assuming header is an image)?
$targetHeader=($targetHeader.is("img"))? $targetHeader : $targetHeader.find('img').eq(0) //Set target to either header itself, or first image within header
$targetHeader.attr('src', (state=="expand")? config.htmlsetting.expand : config.htmlsetting.collapse) //change header image
}
else if (config.htmlsetting.location=="prefix") //if change "prefix" HTML, locate dynamically added ".accordprefix" span tag and change it
$targetHeader.find('.accordprefix').html((state=="expand")? config.htmlsetting.expand : config.htmlsetting.collapse)
else if (config.htmlsetting.location=="suffix")
$targetHeader.find('.accordsuffix').html((state=="expand")? config.htmlsetting.expand : config.htmlsetting.collapse)
},

urlparamselect:function(headerclass){
var result=window.location.search.match(new RegExp(headerclass+"=((\\d+)(,(\\d+))*)", "i")) //check for "?headerclass=2,3,4" in URL
if (result!=null)
result=RegExp.$1.split(',')
return result //returns null, [index], or [index1,index2,etc], where index are the desired selected header indices
},

getCookie:function(Name){ 
var re=new RegExp(Name+"=[^;]+", "i") //construct RE to search for target name/value pair
if (document.cookie.match(re)) //if cookie found
return document.cookie.match(re)[0].split("=")[1] //return its value
return null
},

setCookie:function(name, value){
document.cookie = name + "=" + value + "; path=/"
},

init:function(config){
document.write('<style type="text/css">\n')
document.write('.'+config.contentclass+'{display: none}\n') //generate CSS to hide contents
document.write('a.hiddenajaxlink{display: none}\n') //CSS class to hide ajax link
document.write('<\/style>')
jQuery(document).ready(function($){
ddaccordion.urlparamselect(config.headerclass)
var persistedheaders=ddaccordion.getCookie(config.headerclass)
ddaccordion.headergroup[config.headerclass]=$('.'+config.headerclass) //remember header group for this accordion
ddaccordion.contentgroup[config.headerclass]=$('.'+config.contentclass) //remember content group for this accordion
var $headers=ddaccordion.headergroup[config.headerclass]
var $subcontents=ddaccordion.contentgroup[config.headerclass]
config.cssclass={collapse: config.toggleclass[0], expand: config.toggleclass[1]} //store expand and contract CSS classes as object properties
config.revealtype=config.revealtype || "click"
config.revealtype=config.revealtype.replace(/mouseover/i, "mouseenter")
if (config.revealtype=="clickgo"){
config.postreveal="gotourl" //remember added action
config.revealtype="click" //overwrite revealtype to "click" keyword
}
if (typeof config.togglehtml=="undefined")
config.htmlsetting={location: "none"}
else
config.htmlsetting={location: config.togglehtml[0], collapse: config.togglehtml[1], expand: config.togglehtml[2]} //store HTML settings as object properties
config.oninit=(typeof config.oninit=="undefined")? function(){} : config.oninit //attach custom "oninit" event handler
config.onopenclose=(typeof config.onopenclose=="undefined")? function(){} : config.onopenclose //attach custom "onopenclose" event handler
var lastexpanded={} //object to hold reference to last expanded header and content (jquery objects)
var expandedindices=ddaccordion.urlparamselect(config.headerclass) || ((config.persiststate && persistedheaders!=null)? persistedheaders : config.defaultexpanded)
if (typeof expandedindices=='string') //test for string value (exception is config.defaultexpanded, which is an array)
expandedindices=expandedindices.replace(/c/ig, '').split(',') //transform string value to an array (ie: "c1,c2,c3" becomes [1,2,3]
if (expandedindices.length==1 && expandedindices[0]=="-1") //check for expandedindices value of [-1], indicating persistence is on and no content expanded
expandedindices=[]
if (config["collapseprev"] && expandedindices.length>1) //only allow one content open?
expandedindices=[expandedindices.pop()] //return last array element as an array (for sake of jQuery.inArray())
if (config["onemustopen"] && expandedindices.length==0) //if at least one content should be open at all times and none are, open 1st header
expandedindices=[0]
$headers.each(function(index){ //loop through all headers
var $header=$(this)
if (/(prefix)|(suffix)/i.test(config.htmlsetting.location) && $header.html()!=""){ //add a SPAN element to header depending on user setting and if header is a container tag
$('<span class="accordprefix"></span>').prependTo(this)
$('<span class="accordsuffix"></span>').appendTo(this)
}
$header.attr('headerindex', index+'h') //store position of this header relative to its peers
$subcontents.eq(index).attr('contentindex', index+'c') //store position of this content relative to its peers
var $subcontent=$subcontents.eq(index)
var $hiddenajaxlink=$subcontent.find('a.hiddenajaxlink:eq(0)') //see if this content should be loaded via ajax
if ($hiddenajaxlink.length==1){
$header.data('ajaxinfo', {url:$hiddenajaxlink.attr('href'), cacheddata:null, status:'none'}) //store info about this ajax content inside header
}
var needle=(typeof expandedindices[0]=="number")? index : index+'' //check for data type within expandedindices array- index should match that type
if (jQuery.inArray(needle, expandedindices)!=-1){ //check for headers that should be expanded automatically (convert index to string first)
ddaccordion.expandit($header, $subcontent, config, false, false, !config.animatedefault) //3rd last param sets 'isuseractivated' parameter, 2nd last sets isdirectclick, last sets skipanimation param
lastexpanded={$header:$header, $content:$subcontent}
}  //end check
else{
$subcontent.hide()
config.onopenclose($header.get(0), parseInt($header.attr('headerindex')), $subcontent.css('display'), false) //Last Boolean value sets 'isuseractivated' parameter
ddaccordion.transformHeader($header, config, "collapse")
}
})
$headers.bind("evt_accordion", function(e, isdirectclick){ //assign CUSTOM event handler that expands/ contacts a header
var $subcontent=$subcontents.eq(parseInt($(this).attr('headerindex'))) //get subcontent that should be expanded/collapsed
if ($subcontent.css('display')=="none"){
ddaccordion.expandit($(this), $subcontent, config, true, isdirectclick) //2nd last param sets 'isuseractivated' parameter
if (config["collapseprev"] && lastexpanded.$header && $(this).get(0)!=lastexpanded.$header.get(0)){ //collapse previous content?
ddaccordion.collapseit(lastexpanded.$header, lastexpanded.$content, config, true) //Last Boolean value sets 'isuseractivated' parameter
}
lastexpanded={$header:$(this), $content:$subcontent}
}
else if (!config["onemustopen"] || config["onemustopen"] && lastexpanded.$header && $(this).get(0)!=lastexpanded.$header.get(0)){
ddaccordion.collapseit($(this), $subcontent, config, true) //Last Boolean value sets 'isuseractivated' parameter
}
  })
$headers.bind(config.revealtype, function(){
if (config.revealtype=="mouseenter"){
clearTimeout(config.revealdelay)
var headerindex=parseInt($(this).attr("headerindex"))
config.revealdelay=setTimeout(function(){ddaccordion.expandone(config["headerclass"], headerindex)}, config.mouseoverdelay || 0)
}
else{
$(this).trigger("evt_accordion", [true]) //last parameter indicates this is a direct click on the header
return false //cancel default click behavior
}
})
$headers.bind("mouseleave", function(){
clearTimeout(config.revealdelay)
})
config.oninit($headers.get(), expandedindices)
$(window).bind('unload', function(){ //clean up and persist on page unload
$headers.unbind()
var expandedindices=[]
$subcontents.filter(':visible').each(function(index){ //get indices of expanded headers
expandedindices.push($(this).attr('contentindex'))
})
if (config.persiststate==true && $headers.length>0){ //persist state?
expandedindices=(expandedindices.length==0)? '-1c' : expandedindices //No contents expanded, indicate that with dummy '-1c' value?
ddaccordion.setCookie(config.headerclass, expandedindices)
}
})
})
}
}

//preload any images defined inside ajaxloadingmsg variable
ddaccordion.preloadimages(jQuery(ddaccordion.ajaxloadingmsg).filter('img'))

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