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jquery实现简单的二级导航下拉菜单效果

时间：2015-09-07 16:18作者：yezheng人气：297

本文实例讲述了jquery实现简单的二级导航下拉菜单效果。分享给大家供大家参考。具体如下：

jQuery代码实现的二级导航菜单效果，非常简洁，喜欢简洁风格的朋友您可以下载哦。菜单最多支持两级，CSS的配合也是挺重要的，不多说了，要代码的就直接复制吧。

运行效果截图如下：

具体代码如下：

<title>jquery二级导航菜单</title>

<style>

.ddsmoothmenu {

MARGIN: 0px auto; FONT: 12px Verdana; WIDTH: 730px

}

.ddsmoothmenu UL {

PADDING-RIGHT: 0px; PADDING-LEFT: 0px;BACKGROUND: #2b9801; Z-INDEX: 100; FLOAT: left; PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-TOP: 0px; LIST-STYLE-TYPE: none

}

.ddsmoothmenu UL LI {

DISPLAY: block; FLOAT: left; WIDTH: 81px; LINE-HEIGHT: 31px; POSITION: relative; TEXT-ALIGN: center

}

HTML .ddsmoothmenu UL LI {

FLOAT: left; WIDTH: 81px; LINE-HEIGHT: 31px; POSITION: relative; TEXT-ALIGN: center

}

.ddsmoothmenu UL LI A {

DISPLAY: block; FONT-WEIGHT: bold; WIDTH: 81px; TEXT-DECORATION: none

}

.ddsmoothmenu UL LI A:link {

COLOR: #fff

}

.ddsmoothmenu UL LI A:visited {

COLOR: #fff

}

.ddsmoothmenu UL LI A:hover {

COLOR: #ffff00

}

.ddsmoothmenu UL LI UL {

LEFT: 0px; VISIBILITY: hidden; POSITION: absolute

}

.ddsmoothmenu UL LI UL LI {

BACKGROUND: #2b9801; FLOAT: left; WIDTH: 81px; LINE-HEIGHT: 25px; BORDER-BOTTOM: #96d47d 1px solid

}

.ddsmoothmenu UL LI UL LI A {

DISPLAY: block; WIDTH: 81px; TEXT-DECORATION: none

}

.ddsmoothmenu UL LI UL LI A:hover {

BACKGROUND: #51b228

}

.ddsmoothmenu UL LI UL LI UL {

TOP: 0px

}

.downarrowclass {

DISPLAY: none; POSITION: absolute

}

.rightarrowclass {

DISPLAY: none; POSITION: absolute

}

.ddshadow {

BACKGROUND: silver; LEFT: 0px; WIDTH: 0px; POSITION: absolute; TOP: 0px; HEIGHT: 0px

}

.toplevelshadow {

opacity: 0.8

}

</style>

var ddsmoothmenu={

//Specify full URL to down and right arrow images (23 is padding-right added to top level LIs with drop downs):

arrowimages: {down:['downarrowclass', '', 0], right:['rightarrowclass', '']},

transition: {overtime:300, outtime:300}, //duration of slide in/ out animation, in milliseconds

shadow: {enabled:false, offsetx:5, offsety:5},

detectwebkit: navigator.userAgent.toLowerCase().indexOf("applewebkit")!=-1, //detect WebKit browsers (Safari, Chrome etc)

getajaxmenu:function($, setting){ //function to fetch external page containing the panel DIVs

var $menucontainer=$('#'+setting.contentsource[0]) //reference empty div on page that will hold menu

$menucontainer.html("Loading Menu...")

$.ajax({

url: setting.contentsource[1], //path to external menu file

async: true,

error:function(ajaxrequest){

$menucontainer.html('Error fetching content. Server Response: '+ajaxrequest.responseText)

success:function(content){

$menucontainer.html(content)

ddsmoothmenu.buildmenu($, setting)

}

})

buildshadow:function($, $subul){

buildmenu:function($, setting){

var smoothmenu=ddsmoothmenu

var $mainmenu=$("#"+setting.mainmenuid+">ul") //reference main menu UL

var $headers=$mainmenu.find("ul").parent()

$headers.each(function(i){

var $curobj=$(this).css({zIndex: 100-i}) //reference current LI header

var $subul=$(this).find('ul:eq(0)').css({display:'block'})

this._dimensions={w:this.offsetWidth, h:this.offsetHeight, subulw:$subul.outerWidth(), subulh:$subul.outerHeight()}

this.istopheader=$curobj.parents("ul").length==1? true : false //is top level header?

$subul.css({top:this.istopheader? this._dimensions.h+"px" : 0})

$curobj.children("a:eq(0)").css(this.istopheader? {paddingRight: smoothmenu.arrowimages.down[2]} : {}).append( //add arrow images

'<img src="'+ (this.istopheader? smoothmenu.arrowimages.down[1] : smoothmenu.arrowimages.right[1])

+'" class="' + (this.istopheader? smoothmenu.arrowimages.down[0] : smoothmenu.arrowimages.right[0])

+ '" style="border:0;" />'

)

if (smoothmenu.shadow.enabled){

this._shadowoffset={x:(this.istopheader?$subul.offset().left+smoothmenu.shadow.offsetx : this._dimensions.w), y:(this.istopheader? $subul.offset().top+smoothmenu.shadow.offsety : $curobj.position().top)} //store this shadow's offsets

if (this.istopheader)

$parentshadow=$(document.body)

else{

var $parentLi=$curobj.parents("li:eq(0)")

$parentshadow=$parentLi.get(0).$shadow

}

this.$shadow=$('<div class="ddshadow'+(this.istopheader? ' toplevelshadow' : '')+'"></div>').prependTo($parentshadow).css({left:this._shadowoffset.x+'px', top:this._shadowoffset.y+'px'}) //insert shadow DIV and set it to parent node for the next shadow div

}

$curobj.hover(

function(e){

var $targetul=$(this).children("ul:eq(0)")

this._offsets={left:$(this).offset().left, top:$(this).offset().top}

var menuleft=this.istopheader? 0 : this._dimensions.w

menuleft=(this._offsets.left+menuleft+this._dimensions.subulw>$(window).width())? (this.istopheader? -this._dimensions.subulw+this._dimensions.w : -this._dimensions.w) : menuleft //calculate this sub menu's offsets from its parent

if ($targetul.queue().length<=1){ //if 1 or less queued animations

$targetul.css({left:menuleft+"px", width:this._dimensions.subulw+'px'}).animate({height:'show',opacity:'show'}, ddsmoothmenu.transition.overtime)

if (smoothmenu.shadow.enabled){

var shadowleft=this.istopheader? $targetul.offset().left+ddsmoothmenu.shadow.offsetx : menuleft

var shadowtop=this.istopheader?$targetul.offset().top+smoothmenu.shadow.offsety : this._shadowoffset.y

if (!this.istopheader && ddsmoothmenu.detectwebkit){ //in WebKit browsers, restore shadow's opacity to full

this.$shadow.css({opacity:1})

}

this.$shadow.css({overflow:'', width:this._dimensions.subulw+'px', left:shadowleft+'px', top:shadowtop+'px'}).animate({height:this._dimensions.subulh+'px'}, ddsmoothmenu.transition.overtime)

}

function(e){

var $targetul=$(this).children("ul:eq(0)")

$targetul.animate({height:'hide', opacity:'hide'}, ddsmoothmenu.transition.outtime)

if (smoothmenu.shadow.enabled){

if (ddsmoothmenu.detectwebkit){ //in WebKit browsers, set first child shadow's opacity to 0, as "overflow:hidden" doesn't work in them

this.$shadow.children('div:eq(0)').css({opacity:0})

}

this.$shadow.css({overflow:'hidden'}).animate({height:0}, ddsmoothmenu.transition.outtime)

}

) //end hover

}) //end $headers.each()

$mainmenu.find("ul").css({display:'none', visibility:'visible'})

init:function(setting){

if (typeof setting.customtheme=="object" && setting.customtheme.length==2){

var mainmenuid='#'+setting.mainmenuid

document.write('<style type="text/css">n'

+mainmenuid+', '+mainmenuid+' ul li a {background:'+setting.customtheme[0]+';}n'

+mainmenuid+' ul li a:hover {background:'+setting.customtheme[1]+';}n'

+'</style>')

}

jQuery(document).ready(function($){ //override default menu colors (default/hover) with custom set?

if (typeof setting.contentsource=="object"){ //if external ajax menu

ddsmoothmenu.getajaxmenu($, setting)

}

else{ //else if markup menu

ddsmoothmenu.buildmenu($, setting)

}

})

}

} //end ddsmoothmenu variable

//Initialize Menu instance(s):

ddsmoothmenu.init({

mainmenuid: "smoothmenu1", //menu DIV id

customtheme: [], //override default menu CSS background values? Uncomment: ["normal_background", "hover_background"]

contentsource: "markup" //"markup" or ["container_id", "path_to_menu_file"]

})

</SCRIPT>

<UL>

</LI>

<UL>

</LI></UL></LI>

<UL>

</LI></UL></LI>

<UL>

</LI></UL></LI>

<UL>

</LI></UL></LI>

<UL>

</LI></UL></LI>

<UL>

</LI></UL></LI>

<UL>

</LI></UL></LI>

</UL>

</DIV>

希望本文所述对大家的jquery程序设计有所帮助。

标签jquery,实现,简单,二级,导航,下拉菜单,效果,本文

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