Rumah >Tutorial CMS >DEDECMS >dedecms怎么做下拉菜单
dedecms做下拉菜单:
将下面这段代码贴到templets\default\footer.htm文件里
<!-- //二级子类下拉菜单,考虑SEO原因放置于底部 --> <script type='text/javascript' src='{dede:global.cfg_cmsurl/}/images/js/dropdown.js'></script> {dede:channelartlist typeid='top' cacheid='channelsonlist'} <ul id="dropmenu{dede:field.typeid/}" class="dropMenu"> {dede:channel type='son' noself='yes'} <li><a href="[field:typelink/]">[field:typename/]</a></li> {/dede:channel} </ul> {/dede:channelartlist} <script type="text/javascript">cssdropdown.startchrome("navMenu")</script>
以上代码可以看出,二级子类下拉菜单是由dropdown.js控制的,我们来看dropdown.js文件:
由以上的cssdropdown.startchrome("navMenu"),可以看出我们调用的是 startchrome:function()
var cssdropdown={ disappeardelay: 250, disablemenuclick: false, enableswipe: 1, enableiframeshim: 1, dropmenuobj: null, ie: document.all, firefox: document.getElementById&&!document.all, swipetimer: undefined, bottomclip:0, getposOffset:function(what, offsettype){ var totaloffset=(offsettype=="left")? what.offsetLeft : what.offsetTop; var parentEl=what.offsetParent; while (parentEl!=null){ totaloffset=(offsettype=="left")? totaloffset+parentEl.offsetLeft : totaloffset+parentEl.offsetTop; parentEl=parentEl.offsetParent; } return totaloffset; }, swipeeffect:function(){ if (this.bottomclip<parseInt(this.dropmenuobj.offsetHeight)){ this.bottomclip+=10+(this.bottomclip/10) this.dropmenuobj.style.clip="rect(0 auto "+this.bottomclip+"px 0)" } else return this.swipetimer=setTimeout("cssdropdown.swipeeffect()", 10) }, showhide:function(obj, e){ if (this.ie || this.firefox) this.dropmenuobj.style.left=this.dropmenuobj.style.top="-500px" if (e.type=="click" && obj.visibility==hidden || e.type=="mouseover"){ if (this.enableswipe==1){ if (typeof this.swipetimer!="undefined") clearTimeout(this.swipetimer) obj.clip="rect(0 auto 0 0)" this.bottomclip=0 this.swipeeffect() } obj.visibility="visible" } else if (e.type=="click") obj.visibility="hidden" }, iecompattest:function(){ return (document.compatMode && document.compatMode!="BackCompat")? document.documentElement : document.body }, clearbrowseredge:function(obj, whichedge){ var edgeoffset=0 if (whichedge=="rightedge"){ var windowedge=this.ie && !window.opera? this.iecompattest().scrollLeft+this.iecompattest().clientWidth-15 : window.pageXOffset+window.innerWidth-15 this.dropmenuobj.contentmeasure=this.dropmenuobj.offsetWidth if (windowedge-this.dropmenuobj.x < this.dropmenuobj.contentmeasure) edgeoffset=this.dropmenuobj.contentmeasure-obj.offsetWidth } else{ var topedge=this.ie && !window.opera? this.iecompattest().scrollTop : window.pageYOffset var windowedge=this.ie && !window.opera? this.iecompattest().scrollTop+this.iecompattest().clientHeight-15 : window.pageYOffset+window.innerHeight-18 this.dropmenuobj.contentmeasure=this.dropmenuobj.offsetHeight if (windowedge-this.dropmenuobj.y < this.dropmenuobj.contentmeasure){ edgeoffset=this.dropmenuobj.contentmeasure+obj.offsetHeight if ((this.dropmenuobj.y-topedge)<this.dropmenuobj.contentmeasure) edgeoffset=this.dropmenuobj.y+obj.offsetHeight-topedge } } return edgeoffset }, dropit:function(obj, e, dropmenuID){ if (this.dropmenuobj!=null) this.dropmenuobj.style.visibility="hidden" this.clearhidemenu() if (this.ie||this.firefox){ obj.οnmοuseοut=function(){cssdropdown.delayhidemenu()} obj.οnclick=function(){return !cssdropdown.disablemenuclick} this.dropmenuobj=document.getElementById(dropmenuID) if(!this.dropmenuobj) return; this.dropmenuobj.οnmοuseοver=function(){cssdropdown.clearhidemenu()} this.dropmenuobj.οnmοuseοut=function(e){cssdropdown.dynamichide(e)} this.dropmenuobj.οnclick=function(){cssdropdown.delayhidemenu()} this.showhide(this.dropmenuobj.style, e) this.dropmenuobj.x=this.getposOffset(obj, "left") this.dropmenuobj.y=this.getposOffset(obj, "top") this.dropmenuobj.style.left=this.dropmenuobj.x-this.clearbrowseredge(obj, "rightedge")+"px" this.dropmenuobj.style.top=this.dropmenuobj.y-this.clearbrowseredge(obj, "bottomedge")+obj.offsetHeight+1+"px" this.positionshim() } }, positionshim:function(){ if (this.enableiframeshim && typeof this.shimobject!="undefined"){ if (this.dropmenuobj.style.visibility=="visible"){ this.shimobject.style.width=this.dropmenuobj.offsetWidth+"px" this.shimobject.style.height=this.dropmenuobj.offsetHeight+"px" this.shimobject.style.left=this.dropmenuobj.style.left this.shimobject.style.top=this.dropmenuobj.style.top } this.shimobject.style.display=(this.dropmenuobj.style.visibility=="visible")? "block" : "none" } }, hideshim:function(){ if (this.enableiframeshim && typeof this.shimobject!="undefined") this.shimobject.style.display='none' }, contains_firefox:function(a, b) { while (b.parentNode) if ((b = b.parentNode) == a) return true; return false; }, dynamichide:function(e){ var evtobj=window.event? window.event : e if (this.ie&&!this.dropmenuobj.contains(evtobj.toElement)) this.delayhidemenu() else if (this.firefox&&e.currentTarget!= evtobj.relatedTarget&& !this.contains_firefox(evtobj.currentTarget, evtobj.relatedTarget)) this.delayhidemenu() }, delayhidemenu:function(){ this.delayhide=setTimeout("cssdropdown.dropmenuobj.style.visibility='hidden'; cssdropdown.hideshim()",this.disappeardelay) }, clearhidemenu:function(){ if (this.delayhide!="undefined") clearTimeout(this.delayhide) }, startchrome:function(){ for (var ids=0; ids<arguments.length; ids++){ var menuitems=document.getElementById(arguments[ids]).getElementsByTagName("a") for (var i=0; i<menuitems.length; i++){ if (menuitems[i].getAttribute("rel")){ var relvalue=menuitems[i].getAttribute("rel") menuitems[i].οnmοuseοver=function(e){ var event=typeof e!="undefined"? e : window.event cssdropdown.dropit(this,event,this.getAttribute("rel")) } } } } if (window.createPopup && !window.XmlHttpRequest){ document.write('<IFRAME id="iframeshim" src="" style="display: none; left: 0; top: 0; z-index: 90; position: absolute; filter: progid:DXImageTransform.Microsoft.Alpha(style=0,opacity=0)" frameBorder="0" scrolling="no"></IFRAME>') this.shimobject=document.getElementById("iframeshim") } } }
由上可以看出,var cssdropdown变量中有多个函数:
getposOffset:function(what, offsettype) swipeeffect:function() showhide:function(obj, e) iecompattest:function() clearbrowseredge:function(obj, whichedge) dropit:function(obj, e, dropmenuID) positionshim:function() hideshim:function() dynamichide:function(e) delayhidemenu:function() clearhidemenu:function() startchrome:function()
更新一下!会发现导航栏已经出现下拉菜单了,只是背景是透明的,原因是没有背景图片。
然后我们可以对此下拉菜单添加背景图片和设置css样式。
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