我正在尝试弄清楚如何在菜单过渡中进行平滑过渡。我已经编写了一个函数,用于在单击时显示和消失的时间,但我不确定如何设置过渡样式。
这是我到目前为止所拥有的:
.HTML:
<nav id="menu">
<h2>Menu</h2>
<ul>
<li id="toggleTitle">Projects <i class="fa fa-angle-down" aria-hidden="true"></i></li>
<li class="projects projectsClass"><a href="#">Project 1</a></li>
<li class="projects projectsClass"><a href="#">Project 2</a></li>
<li class="projects projectsClass"><a href="#">Project 3</a></li>
</ul>
</nav>
.JS:
//toggleProjects
var toggleProjects = function(){
//function
var projectsList=document.getElementsByClassName('projects');
// if(projectsList[0].style.display=='none'){
if(!projectsList[0].classList.contains('projectsClass')){
//reappear
for(var i=0; i<projectsList.length; i++){
// projectsList[i].style.display='';
projectsList[i].classList.add('projectsClass');
}
} else {
//disappear
for(var i=0; i<projectsList.length; i++){
// projectsList[i].style.display='none';
projectsList[i].classList.remove('projectsClass');
}
}
};
//event listener for click
document.getElementById('toggleTitle').addEventListener('click',
toggleProjects);
.CSS:
.projectsClass {
display: none;
}
.projects {
margin-left: 30px;
}
#menu > .toggleTitle {
padding: 1em 0;
line-height: 1.5;
border: 0;
color: white;
}
jsfiddlelink:https://jsfiddle.net/j2fygbzb/
我让它使用您的代码做一些类似于您所期望(或者我认为(的事情,并且只有一些非常轻微的 css 修改。我添加了一个过渡 css 属性.projects
这是一个小提琴:
https://jsfiddle.net/j2fygbzb/9/
这是我更改的 CSS:
.projectsClass {
max-height: 0 !important;
visibility: hidden !important;
}
.projects {
margin-left: 30px;
max-height: 20px;
visibility: visible;
transition: all 0.5s;
}