web前端|js教程
jquery,二级导航,下拉菜单
web前端-js教程
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：
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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。
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运行效果截图如下：
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在线演示地址如下：
/js//jquery-2jxl-menu-codes/
具体代码如下：
jquery二级导航菜单.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}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:[
ightarrowclass, \]},transition: {overtime:300, outtime:300}, //duration of slide in/ out animation, in millisecondsshadow: {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:lock}) 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}) $curobj.children("a:eq(0)").css(this.istopheader? {paddingRight: smoothmenu.arrowimages.down[2]} : {}).append( //add arrow images \ ) if (smoothmenu.shadow.enabled){ this._shadowoffset={x:(this.istopheader?$subul.offset().left+smoothmenu.shadow.offsetx : this._dimensions.w), y:(this.istopheader? $subul.offset().top+smoothmenu.shadow.offsety : $curobj.position().top)} //store this shadows offsets if (this.istopheader) $parentshadow=$(document.body) else{ var $parentLi=$curobj.parents("li:eq(0)") $parentshadow=$parentLi.get(0).$shadow } this.$shadow=$(
).prependTo($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>$(window).width())? (this.istopheader? -this._dimensions.subulw+this._dimensions.w : -this._dimensions.w) : menuleft //calculate this sub menus offsets from its parent if ($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? $targetul.offset().left+ddsmoothmenu.shadow.offsetx : menuleftvar shadowtop=this.istopheader?$targetul.offset().top+smoothmenu.shadow.offsety : this._shadowoffset.yif (!this.istopheader && ddsmoothmenu.detectwebkit){ //in WebKit browsers, restore shadows 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)") $targetul.animate({height:hide, opacity:hide}, ddsmoothmenu.transition.outtime) if (smoothmenu.shadow.enabled){if (ddsmoothmenu.detectwebkit){ //in WebKit browsers, set first child shadows opacity to 0, as "overflow:hidden" doesn work in themthis.$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:
one, visibility:visible})},init:function(setting){ if (typeof setting.customtheme=="object" && setting.customtheme.length==2){ var mainmenuid=#+setting.mainmenuid document.write(\
+mainmenuid+, +mainmenuid+ ul li a {background:+setting.customtheme[0]+;}\n +mainmenuid+ ul li a:hover {background:+setting.customtheme[1]+;}\n +\) } 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"]})
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