[英]How do I create a smooth transition in my menu dropdown?
我試圖弄清楚如何在菜單過渡中進行平滑過渡。 我已經寫了一個函數,可以使onclick出現和消失,但是我不確定如何設置過渡的樣式。
這是我到目前為止的內容:
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/
我使用它的代碼和一些非常小的CSS修改來做與您期望的(或我認為的)相似的事情。 我向.projects
添加了一個過渡CSS屬性,這是一個小提琴:
https://jsfiddle.net/j2fygbzb/9/
這是我更改的CSS:
.projectsClass {
max-height: 0 !important;
visibility: hidden !important;
}
.projects {
margin-left: 30px;
max-height: 20px;
visibility: visible;
transition: all 0.5s;
}
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