javascript - 如何获得淡入淡出的模态效果？

Question

https://jsfiddle.net/7doq0vkL/1/

我正在尝试让这个 JSFiddle 在关闭时淡入淡出。它正在工作，但关闭后它并没有再次打开。我试图将 div 设置为显示:900 毫秒后无，但这停止了关闭淡入淡出的工作。谁能看到需要对 JSFiddle 进行哪些更改才能使其再次打开？

<div class="w3-container">
  <h2>Animated Modal</h2>

  <button onclick="document.getElementById('id01').style.display='block'" class="w3-button w3-black">Fade In Modal</button>

  <div id="id01" class="w3-modal w3-animate-opacity">
    <div class="w3-modal-content w3-card-4">
      <header class="w3-container w3-teal">
        <span onclick="document.getElementById('id01').classList.add('w3-animate-show');" class="w3-button w3-large w3-display-topright">&times;</span>
        <h2>Modal Header</h2>
      </header>
      <div class="w3-container">
        <p>Some text..</p>
        <p>Some text..</p>
      </div>
      <footer class="w3-container w3-teal">
        <p>Modal Footer</p>
      </footer>
    </div>
  </div>
</div>

CSS

 .w3-animate-opacity {
   animation: opac 0.8s
 }

 @keyframes opac {
   from {
     opacity: 0
   }
   to {
     opacity: 1
   }
 }

 .w3-animate-show {
   animation: show 0.8s;
   animation-fill-mode: forwards;
 }

 @keyframes show {
   0% {
     opacity: 1
   }
   100% {
     opacity: 0
   }
 }

Answer 1

将元素留在页面上 display: none; opacity: 0; 将保持页面上该元素的布局，覆盖您的按钮。您可以使用 animationend 事件在元素淡出后应用 display: none。

var id01 = document.getElementById('id01');

document.querySelector('.close').addEventListener('click', function() {
  id01.classList.add('w3-animate-show');
})

id01.addEventListener('animationend', function() {
  if (this.classList.contains('w3-animate-show')) {
    this.style.display = 'none';
    this.classList.remove('w3-animate-show')
  }
});

<link href="https://www.w3schools.com/w3css/4/w3.css" rel="stylesheet"/>
<style>
 .w3-animate-opacity {
   animation: opac 0.8s
 }
 
 @keyframes opac {
   from {
     opacity: 0
   }
   to {
     opacity: 1
   }
 }
 
 .w3-animate-show {
   animation: show 0.8s;
   animation-fill-mode: forwards;
 }
 
 @keyframes show {
   0% {
     opacity: 1
   }
   100% {
     opacity: 0
   }
 }
</style>
<div class="w3-container">
  <h2>Animated Modal</h2>

  <button onclick="document.getElementById('id01').style.display='block'" class="w3-button w3-black">Fade In Modal</button>

  <div id="id01" class="w3-modal w3-animate-opacity">
    <div class="w3-modal-content w3-card-4">
      <header class="w3-container w3-teal">
        <span class="w3-button w3-large w3-display-topright close">&times;</span>
        <h2>Modal Header</h2>
      </header>
      <div class="w3-container">
        <p>Some text..</p>
        <p>Some text..</p>
      </div>
      <footer class="w3-container w3-teal">
        <p>Modal Footer</p>
      </footer>
    </div>
  </div>
</div>