Navigation bar drop-down menu css positioning

The website navigation bar has a drop-down menu, but when the drop-down menu appears, it will push down the content below. What should I do? ? ? Please ask the master

Reply to the discussion (solution)

Add position:absolute;z-index:999;

position:absolute absolute positioning to the css of the drop-down layer , regardless of context.

z-index: Which layer? This number should be the largest to cover other content.

Add position:absolute;z-index:999 to the css of the drop-down layer;

position:absolute absolute positioning, regardless of context.

z-index: Which layer? This number should be the largest to cover other content.
Still not working, I added the drop-down menu ul
ul{display:none;position:absolute;z-index:999;}

Post more code.

Post more codes.
.navbar-float{list-style-type:none; border-right:1px solid #406b8d; line-height:36px;}
#navbar-float-last{border:0px solid #024e70}
#navbar ul{width: 100%;position:relative;right:1px;}
#navbar{height:36px; filter:alpha(Opacity=130);-moz-opacity:0.5;opacity: 0.8; z-index:100; background:#024e70;}
.navbar-float{float:left; width:95px; text-align:center;}
.navbar-float a{color:white;}
.navbar-float a:hover{position:relative; top:1px;}
.navbar-float ul{display:none;position:absolute;z-index:999;}
.navbar-float ul li{
width:150px;
background-color:#000;
text-align:left;
padding-left:5px;
list-style-type:disc;
list-style-position:inside;
filter:alpha(Opacity=130);
-moz-opacity:0.7;
opacity:0.98;
z-index:999;
border-left:1px solid #024e70;
border-right:1px solid #024e70;
border-bottom:1px dashed #333;

Can’t you send more code? What about the js part.

<!-- 導(dǎo)航條開(kāi)始 -->					<div id="navbar">						<ul>							<!-- 首頁(yè)分類開(kāi)始 -->							<li class="navbar-float">								<a href="#">首    頁(yè)</a>							</li>							<li class="navbar-float">								<a href="#" id="navbar-intro">學(xué)院簡(jiǎn)介</a>								<ul>									<li><a href="#">學(xué)院概況</a></li>									<li><a href="#">歷屆領(lǐng)導(dǎo)</a></li>									<li><a href="#">學(xué)院領(lǐng)導(dǎo)</a></li>									<li><a href="#">辦公電話</a></li>								</ul>							</li>							<!-- 首頁(yè)分類結(jié)束 -->														<!-- 機(jī)構(gòu)設(shè)置分類開(kāi)始 -->							<li class="navbar-float">								<a href="#" id="navbar-organ">機(jī)構(gòu)設(shè)置</a>								<ul>									<li><a href="#">黨政管理機(jī)構(gòu)</a></li>									<li><a href="#">黨務(wù)機(jī)構(gòu)</a></li>									<li><a href="#">行政機(jī)構(gòu)</a></li>									<li><a href="#">教學(xué)機(jī)構(gòu)</a></li>									<li><a href="#">系所設(shè)置</a></li>									<li><a href="#">實(shí)驗(yàn)室</a></li>									<li><a href="#">委員會(huì)</a></li>								</ul>							</li>							<!-- 機(jī)構(gòu)設(shè)置分類結(jié)束 -->							<!-- 師資隊(duì)伍分類開(kāi)始 -->							<li class="navbar-float">								<a href="#" id="navbar-teachers">師資隊(duì)伍</a>								<ul>									<li><a href="#">教授</a></li>									<li><a href="#">副教授</a></li>									<li><a href="#">教師名錄</a></li>									<li><a href="#">博士生導(dǎo)師</a></li>									<li><a href="#">碩士生導(dǎo)師</a></li>								</ul>							</li>							<!-- 師資隊(duì)伍分類結(jié)束 -->														<!-- 教育工作分類開(kāi)始 -->							<li class="navbar-float">								<a href="#" id="navbar-edu">教育工作</a>								<ul>									<li><a href="#">學(xué)生工作</a></li>									<li><a href="#">本科教育</a></li>									<li><a href="#">研究生工作</a></li>								</ul>							</li>							<!-- 教育工作分類結(jié)束 -->							<!-- 質(zhì)量工程分類開(kāi)始 -->							<li class="navbar-float"><a href="#">質(zhì)量工程</a></li>							<!-- 質(zhì)量工程分類結(jié)束 -->							<!-- 學(xué)科建設(shè)分類開(kāi)始 -->							<li class="navbar-float"><a href="#">學(xué)科建設(shè)</a></li>							<!-- 學(xué)科建設(shè)分類結(jié)束 -->							<!-- 科學(xué)研究分類開(kāi)始 -->							<li class="navbar-float"><a href="#">科學(xué)研究</a></li>							<!-- 科學(xué)研究分類結(jié)束 -->							<!-- 招生就業(yè)分類開(kāi)始 -->							<li class="navbar-float"><a href="#">招生就業(yè)</a></li>							<!-- 招生就業(yè)分類結(jié)束 -->							<!-- 合作交流分類開(kāi)始 -->							<li class="navbar-float" id="navbar-float-last"><a href="#">合作交流</a></li>							<!-- 合作交流分類結(jié)束 -->						</ul>					</div>					<!-- 導(dǎo)航條結(jié)束 -->

Can’t you send more code? What about the js part.

javascript I just modified the display attribute to block when the mouse moves to the navigation bar

// 通過(guò)id獲得節(jié)點(diǎn)function $(id){	return document.getElementById(id);}// 獲取兄弟節(jié)點(diǎn)function brothers(elem) {	var r = [];	var n = elem.parentNode.firstChild;	for ( ; n; n = n.nextSibling ) {	    if ( n.nodeType === 1 && n !== elem ) {	        r.push( n );	    }	}	return r;}//----------------------------------//          導(dǎo)航欄//----------------------------------// 鼠標(biāo)移動(dòng)到導(dǎo)航欄上function mouse_over_navbar(id) {	// 獲得菜單分類的下一個(gè)兄弟節(jié)點(diǎn)	var child = brothers($(id));	child[0].style.display = "block";}// 鼠標(biāo)移開(kāi)導(dǎo)航欄的下拉菜單function mouse_out_navmenu(id) {	// 獲得菜單分類的下一個(gè)兄弟節(jié)點(diǎn)	var child = brothers($(id));	child[0].style.display = "none";}// 鼠標(biāo)移開(kāi)導(dǎo)航欄的下拉菜單function get_menu_node(id) {	// 獲得菜單分類的下一個(gè)兄弟節(jié)點(diǎn)	var child = brothers($(id));	return child[0];}function hide_menu(which) {	which.style.display = 'none';}// 獲得導(dǎo)航欄下拉菜單// 綁定事件window.onload = function(){	// 導(dǎo)航欄有下拉列表的id值	var navid1 = "navbar-intro";	var navid2 = "navbar-organ";	var navid3 = "navbar-teachers";	var navid4 = "navbar-edu";		// 綁定鼠標(biāo)經(jīng)過(guò)導(dǎo)航欄的事件	$(navid1).onmouseover = function() {		mouse_over_navbar(navid1);	}	$(navid2).onmouseover = function() {		mouse_over_navbar(navid2);	}	$(navid3).onmouseover = function() {		mouse_over_navbar(navid3);	}	$(navid4).onmouseover = function() {		mouse_over_navbar(navid4);	}		}

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Thank you, God

Owner, are you still there? I also encountered this problem, can you tell me how to solve it?