我有一个名为.dropdown-sub的类，另一个名为.dropdown-toggle。我想在点击.dropdown-toggle时单击.dropdown-sub向下滑动，再次单击时消失。
这是css。
/* Mega Menu */
.site-nav > li > a {
padding: 20px;
font-weight: bold;
}
.site-nav > li.mega-menu { position: static; }
.dropdown-sub {
display: none;
position: absolute;
top: 60px;
left: 0;
z-index: 5;
padding: 35px 30px;
margin-bottom: 0;
width: 100%;
min-width: 215px;
}
.wrapper-container .site-nav li.menu-dropdown:focus .dropdown-sub { display: block; text-align: left;}
.wrapper-container .site-nav li.dropdown:focus.mega-menu > a > .icon-dropdown { border-top-color: #fff; opacity: 1; }
.wrapper-container .site-nav li.mega-menu .nav-dropdown { width: auto; left: 0%; right: 0%; border: 0; padding: 40px 45px; }
.wrapper-container .site-nav li.mega-menu .nav-dropdown img{margin-top:37px;}
.nav-dropdown .menu-group ul.menu-dropdown { display: block; position: static; padding: 0; }
.site-nav li.mega-menu > .menu-dropdown:focus > .nav-dropdown,
.site-nav li.mega-menu > .menu-dropdown.open > .nav-dropdown { display: block; }
.cbp-spmenu .nav-dropdown .col-1 { padding:0; }
.cbp-spmenu .nav-dropdown .col-1 .inner { position: relative; }
.cbp-spmenu .nav-dropdown .col-1 .inner > a { margin: 0; padding: 11px 0 13px; font-size: 11px; letter-spacing: 0.02em; border-top: 1px solid #e5e5e5; }
.cbp-spmenu .nav-dropdown .col-1 ul.menu-dropdown { display: none; padding: 0; margin-bottom: 27px; }
.cbp-spmenu .site-nav li.mega-menu li li a { font-size: 12px; padding: 9px 35px; }
.cbp-spmenu .site-nav li.mega-menu li li a:focus span { border-bottom: 1px solid #fff; }
.cbp-spmenu .site-nav li.mega-menu .nav-dropdown li:focus > a:focus,
.cbp-spmenu .site-nav li.mega-menu .nav-dropdown li:focus > a,
.cbp-spmenu .site-nav li.mega-menu .nav-dropdown a:focus { background: none; }
.cbp-spmenu .site-nav li.mega-menu .nav-dropdown > p.toogleClick { top: 0; }
.sub-mega-menu { display: none; }
.addthis_native_toolbox .at-share-tbx-element { display: none; }
.addthis_native_toolbox .at-share-tbx-element:first-child { display: block; }
.site-nav .menu-dropdown .dropdown-sub .menu-title{
font-size: 12px;
font-weight: bold;
letter-spacing: 1px;
margin-bottom: 20px;
text-transform: uppercase;}
.site-nav .menu-dropdown .dropdown-sub ul.nav-links li a{
font-weight: bold;
padding: 7px 0;
}
.site-nav > li.focus > a:before, .site-nav > li:focus > a:before{
content: '';
position: absolute;
height: 45px;
width: 2px;
background-color: #fff;
-ms-transform: translate(0%, -50%) rotate(45deg);
-webkit-transform: translate(0%, -50%) rotate(45deg);
left: 50%;
vertical-align: middle;
display: table-cell;
transform: translate(0%, -50%) rotate(45deg);
top: 50%;
}
.site-nav > li.mega-menu.full-width .dropdown-sub{
top: 140px;
width: auto;
left: 0%;
right: 0%;
border: 0;
text-align: left;
padding: 30px 60px;
}
.container{
position: relative;
}
.site-nav > li {float: none; position: relative; display: inline-block; list-style: none; }
.site-nav > li > a {position: relative; text-transform: uppercase; padding: 22px 20px; letter-spacing: 1px; }
.site-nav > li:first-child > a { margin-left: 0; }
.nav-dropdown {background:#fff; text-align: left; display: none; position: absolute; top: 62px; left: 0; width: 215px; z-index: 999; padding: 15px 20px; margin-bottom: 0; border: 1px solid transparent; }
.nav-dropdown li a { padding: 8px 0px 8px 0px; position: relative; }
.site-nav li:focus .dropdown-sub{opacity: 1;top: 58px;display:block;z-index: 99; visibility: visible;}
.site-nav .menu-dropdown li a{font-size:13px;letter-spacing: 0.5px; font-family: Lato;font-weight:400;text-transform: capitalize;}
.dropdown-sub {
background: #fff none repeat scroll 0 0;
left: 0;transition: all 0.3s ease-in-out 0s;
opacity: 0;
position: absolute;
text-align: left;
top: 100px; visibility: hidden;
width: 100%;
min-width: 220px;padding:0 15px;
z-index: -1;
}
.dropdown-menu-inner {
padding: 15px;
}
.menu-title {
color: #000;
font-family: Montserrat;
font-size: 16px;margin-bottom:10px;
font-weight: 600;
text-transform: uppercase;
}
.lable-new::before {
border-color: #333 transparent #fff;
border-style: solid;
border-width: 6px 4px 0 0;
bottom: -6px;
content: "";
left: 6px;
position: absolute;
}
.is-ticky .lable-new{top:-1px}
.lable-new {
background: #333 none repeat scroll 0 0;
border-radius: 1px;
color: #fff;
font-size: 10px;
font-weight: 300;
left: 50%;
padding: 0 5px;
position: absolute;
top: -8px;
z-index: 9;
}
.lable-hot::before {
border-color: #cc0000 transparent #fff;
border-style: solid;
border-width: 6px 4px 0 0;
bottom: -6px;
content: "";
left: 6px;
position: absolute;
}
.is-ticky .lable-hot{top:-1px}
.lable-hot {
background: #cc0000 none repeat scroll 0 0;
border-radius: 1px;
color: #fff;
font-size: 10px;
font-weight: 300;
left: 50%;
padding: 0 5px;
position: absolute;
top: -8px;
z-index: 9;
}
#product-menu .sca-qv-button-wrap{display:none!important}
#product-menu .grid-item{padding:0 7px;}
这是js：
<script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jquery/1.7.2/jquery.min.js"></script>
<script type="text/javascript">
$(document).ready(function(){
// build a variable to target the #menu div
var menu = $('.dropdown-sub')
// bind a click function to the menu-trigger
$('.dropdown-toggle').click(function(event){
event.preventDefault();
// if the menu is visible slide it up
if (menu.is(":visible"))
{
menu.slideUp(400);
document.getElementsByClassName('dropdown-sub').style.display = 'none';
}
// otherwise, slide the menu down
else
{
menu.slideDown(400);
document.getElementsByClassName('dropdown-sub').style.display = 'block';
}
});
});
</script>
我在Google Chrome控制台上收到此错误＆＃34; 未捕获TypeError：无法设置属性＆＃39;显示＆＃39;未定义的＆＃34;
答案 0 :(得分：0)
if (menu.is(":visible"))
{
menu.slideUp(400);
$('.dropdown-sub').css('visibility', 'hidden');
}
// otherwise, slide the menu down
else
{
menu.slideDown(400);
$('.dropdown-sub').css('visibility', 'visible');
}
OR
if(menu.is(":visible")) {
menu.slideUp(400);
$(dropdown-sub).toggleClass('visible invisible');
} else {
menu.slideDown(400);
$(dropdown-sub).toggleClass('visible invisible');
}}
Make sure .dropdown-sub starts off with this: .visible { visibility: visible;} or .invisible { visibility: hidden; }
答案 1 :(得分：0)
要对代码进行一些改变。
1）将if else中的代码更改为以下内容。
if (menu.is(":visible"))
{
menu.slideUp(400);
document.getElementsByClassName('dropdown-sub')[0].style.display = 'none';//added [0]
//$('.dropdown-sub').css('display','none');
}
// otherwise, slide the menu down
else
{
menu.slideDown(400);
document.getElementsByClassName('dropdown-sub')[0].style.display = 'block'; //added[0]
//$('.dropdown-sub').css('display','block');
}
解释。
getElementsByClassName（）方法返回一个的集合 具有指定类名的元素的子元素，作为NodeList 对象
NodeList对象表示节点的集合。节点可以 通过索引号访问。索引从0开始。
<强> 2）
我认为您忘记制作元素display:block，然后开始向下滑动。否则menu.slideDown(400);将向下滑动隐藏元素，因此您可能看不到动画。所以在你的其他部分这样做。
else
{
document.getElementsByClassName('dropdown-sub')[0].style.display = 'block'; //added[0]
//$('.dropdown-sub').css('display','block');
menu.slideDown(400);
}
注意：由于您已经在使用jquery，因此不必使用document.getElementsByClassName这是一种javascript语法。使用$('.dropdown-sub') jquery语法。我已将它们放在代码中，但已评论过。