Question

方案

我有一个移动菜单，显示窗口低于736px时。此菜单上有一个javascript切换，用于添加和删除显示移动菜单ul（当然还有子li项目）的CSS类。

当您重新调整窗口大小时，CSS媒体查询会切换单独移动菜单的桌面菜单，并且切换按计划运行。

问题

当我重新调整窗口大小，然后打开和关闭移动菜单时，一切正常，当窗口随后再次调整大小后，移动ul和li会在窗口点击时闪烁一秒钟CSS媒体查询断点再次（736px）。

我不知道如何阻止这种情况发生，它确实让我完全绕过弯道，我似乎花了好几个小时才完成这件事，而我却无处可去。

如果有人能帮助我，我会非常感激。

P.S我不介意如果移动菜单保持打开状态，重新调整大小后移动菜单仍然存在 - 这是预期的行为。当移动菜单关闭并且窗口被调整大小到桌面然后再次返回移动以便菜单的闪光正在发生时。

codepen：https://codepen.io/emilychews/pen/aVYGPr

JS

var mobileMenuButton = document.getElementById("mobile-menu-button")
var mobileMenuItems = document.getElementById("mobile-nav-menu-items")

// TOGGLE MOBILE MENU
var mobileMenu = false

function toggleMobileMenu() {

    if (mobileMenu === false) {

      mobileMenuItems.classList.remove("mobileMenuInactive")
      mobileMenuItems.classList.add("mobileMenuActive")
      mobileMenuButton.innerHTML = "Close"
      mobileMenu = true

    } else {

      mobileMenuItems.classList.add("mobileMenuInactive")
      mobileMenuItems.classList.remove("mobileMenuActive")
      mobileMenuButton.innerHTML = "Menu"
      mobileMenu = false

    }
}

mobileMenuButton.addEventListener("click", function() {
    toggleMobileMenu()
}, false)

CSS

body, ul {padding: 0; margin: 0}

#main-header {width: 100%; height: 100px;}

/* desktop navigation */
#main-navigation {
  position: relative;
  width: 100%;
  height: 100px;
  background: red;
  display: flex;
  justify-content: space-between;
  box-sizing: border-box;
  padding: 10px 5% 10px 5%;
  align-items: center;
}

#logo-holder {
  width: 150px;
  height: 66px;
  background-color: grey;
}

ul#nav-menu-items {
  display: flex;
  margin-left: auto;
}

#main-navigation ul li {list-style-type: none;}

#main-navigation ul#nav-menu-items li a {
  padding: 10px 15px;
  margin: 0 5px;
  box-sizing: border-box;
  background: yellow;
  text-decoration: none;
  color:#000;
}

#main-navigation ul#nav-menu-items li a:hover {
  color:blue;
  transition: color .25s;
}

#mobile-menu-button, ul#mobile-nav-menu-items {
  display: none;
}

/* --- MOBILE MENU AND DROPDOWN  ---
Below is a separate menu added for mobiles.
*/

@media screen and (max-width : 736px) {

/*  hides desktop menu  */

  ul#nav-menu-items {display: none}

  #mobile-menu-button {
    display: flex;
    justify-content: center;
    background: blue;
    color: white;
    padding: 10px 15px;
    min-width: 75px;
    cursor: pointer;}

  ul#mobile-nav-menu-items {
    opacity: 0;
    transform: scaleY(0);
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    min-width: 150px;
    background: blue;
    position: absolute;
    right: 5%;
    top: 100px;
    padding: 10px 0px;

  }

  ul#mobile-nav-menu-items li {
    padding: 10px 10px;
  }

  ul#mobile-nav-menu-items li a {
    padding: 10px 15px;
    color: white;
    text-decoration: none;
    transition: color .3s; 
  }

  ul#mobile-nav-menu-items li a:hover {
    color: lightblue;
  }

/* -------- MOBILE CLASSES ADDED WITH JavaScript*/

#mobile-nav-menu-items.mobileMenuActive {
  animation: showMobileMenu .5s ease-in forwards;
}

@keyframes showMobileMenu {
  0% {opacity: 0;transform: scaleY(0);}
  1% {opacity: 0; transform: scaleY(1);}
  100% {opacity: 1; transform: scaleY(1);}
}

#mobile-nav-menu-items.mobileMenuInactive {
  animation: removeMobileMenu .5s ease-out forwards;
}

@keyframes removeMobileMenu {
  0% {opacity: 1; transform: scaleY(1);}
  99% {opacity: 0; transform: scaleY(1);}
  100% {opacity: 0; transform: scaleY(0);}
}

} /*END OF MOBILE MENU STYLING*/

HTML

<header id="main-header">
<!--   desktop nav -->
  <nav id="main-navigation"> 
    <div id="logo-holder"></div>
    <ul id="nav-menu-items">
      <li class="menu-item menu-item-1"><a href="https://www.google.com">News</a></li>
      <li class="menu-item menu-item-2"><a href="https://www.google.com">About</a></li>
      <li class="menu-item menu-item-3"><a href="https://www.google.com">Contact</a></li>
    </ul>
<!--    mobile nav -->
    <ul id="mobile-nav-menu-items">
      <li class="mobile-menu-item mobile-menu-item-1"><a href="https://www.google.com">News</a></li>
      <li class="mobile-menu-item mobile-menu-item-2"><a href="https://www.google.com">About</a></li>
      <li class="mobile-menu-item mobile-menu-item-3"><a href="https://www.google.com">Contact</a></li>
    </ul>
<!--     button for triggering mobile nav -->
    <div id="mobile-menu-button">Menu</div>

  </nav>
</header>

Answer 1

我刚刚删除了下面的代码并且它有效，可能是因为你在CSS和JS文件中操作相同的事件。

@keyframes removeMobileMenu {
  0% {opacity: 1; transform: scaleY(1);}
  99% {opacity: 0; transform: scaleY(1);}
  100% {opacity: 0; transform: scaleY(0);}
}

窗口重新调整后移动菜单闪烁（CSS＆amp; JS问题）

1 个答案: