Question

我遇到一个问题，即页面加载时打开了我的汉堡菜单。除此之外，它还可以按需运行。如果我单击它，它将关闭，然后也打开onclick。

<div class="topnav">
  <a href="#home" class="active">Dashboard</a>
  <!-- Navigation links (hidden by default) -->
  <div id="nav">
                <a href="/index.php"><i class="fas fa-user-circle"></i>Profile</a>
                <a href="../user/invoices.php"><i class="fas fa-user-circle"></i>Invoices</a>
                <a href="/post"><i class="fas fa-user-circle"></i>Post Message</a>
                <a href="/register"><i class="fas fa-user-circle"></i>New User</a>
                <a href="/logout.php"><i class="fas fa-sign-out-alt"></i>Logout</a>
  </div>
  <!-- "Hamburger menu" / "Bar icon" to toggle the navigation links -->
  <a href="javascript:void();" class="icon" onclick="myFunction()">
    <i class="fa fa-bars"></i>
  </a>
</div>

<script>
/* Toggle between showing and hiding the navigation menu links when the user clicks on the hamburger menu / bar icon */
function myFunction() {
  var x = document.getElementById("nav");
  if (x.style.display === "block") {
    x.style.display = "none";
  } else {
    x.style.display = "block";
  }
}
</script>

CSS

* {

    font-family: -apple-system, BlinkMacSystemFont, "segoe ui", roboto, oxygen, ubuntu, cantarell, "fira sans", "droid sans", "helvetica neue", Arial, sans-serif;
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}
body {
    background-color: #435165;

}
.login {
    width: 400px;
    background-color: #ffffff;
    box-shadow: 0 0 9px 0 rgba(0, 0, 0, 0.3);
    margin: 100px auto;
}
.login h1 {
    text-align: center;
    background-color: #737373;
    color: #ffffff;
    font-size: 24px;
    padding: 20px 0 20px 0;
    border-bottom: 1px solid #dee0e4;
}
.login form {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    padding-top: 20px;
}
.login form label {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 50px;
    height: 50px;
    background-color: #737373;
    color: #ffffff;
}
.login form input[type="password"], .login form input[type="text"] {
    width: 310px;
    height: 50px;
    border: 1px solid #dee0e4;
    margin-bottom: 20px;
    padding: 0 15px;
}
.login form input[type="submit"] {
    width: 100%;
    padding: 15px;
    margin-top: 20px;
    background-color: #737373;
    border: 0;
    cursor: pointer;
    font-weight: bold;
    color: #ffffff;
    transition: background-color 0.2s;
}
.login form input[type="submit"]:hover {
    background-color: #ef1d1d;
    transition: background-color 0.2s;
}





.content {
    width: 100%;
    margin: 0 auto;
}
.content h2 {
    margin: 0;
    padding: 25px 0;
    font-size: 22px;
    border-bottom: 1px solid #e0e0e3;
    color: #4a536e;
}
.content > p, .content > div {
    box-shadow: 0 0 5px 0 rgba(0, 0, 0, 0.1);
    margin: 25px 0;
    padding: 25px;
    background-color: #fff;
}
.content > p table td, .content > div table td {
    padding: 5px;
}
.content > p table td:first-child, .content > div table td:first-child {
    font-weight: bold;
    color: #4a536e;
    padding-right: 15px;
}
.content > div p {
    padding: 5px;
    margin: 0 0 10px 0;
}


/* For Posting announcements */

.form-contact {
  max-width: 330px;
  padding: 15px;
  margin: 0 auto;
}
.form-contact .form-contact-heading,
.form-contact .checkbox {
  margin-bottom: 10px;
}
.form-contact .checkbox {
  font-weight: normal;
}
.form-contact .form-control {
  position: relative;
  height: auto;
  -webkit-box-sizing: border-box;
     -moz-box-sizing: border-box;
          box-sizing: border-box;
  padding: 10px;
  font-size: 16px;
}
.form-contact .form-control:focus {
  z-index: 2;
}
.form-contact input[type="email"] {
  margin-bottom: -1px;
  border-bottom-right-radius: 0;
  border-bottom-left-radius: 0;
}
.container { background-color: #435165;}

@media print {
  body {
    display: none;
  }
}




.col-md-12{
    background-color: white;

}


















/* Style the navigation menu */
.topnav {
  overflow: hidden;
  background-color: #333;
  position: relative;
}

/* Hide the links inside the navigation menu (except for logo/home) */
.topnav #myLinks {
  display: none;
}

/* Style navigation menu links */
.topnav a {
  color: white;
  padding: 14px 16px;
  text-decoration: none;
  font-size: 17px;
  display: block;
}

/* Style the hamburger menu */
.topnav a.icon {
  background: #ef1d1d;
  display: block;
  position: absolute;
  right: 0;
  top: 0;
}

/* Add a grey background color on mouse-over */
.topnav a:hover {
  background-color: #ddd;
  color: black;
}

/* Style the active link (or home/logo) */
.active {
  background-color: #737373;
  color: white;
}

在上面的脚本中什么可能导致此问题？我到处都看了看。 javascript似乎正确，但我显然缺少某些内容。

Answer 1

您需要将此添加到CSS：

#nav{
  display:none;
}

默认情况下，即在页面加载时，它将隐藏您的#nav div。另外，您可以使用Javascript通过添加以下内容来隐藏页面加载时的#nav：

// self executing function
(function() {
      var x = document.getElementById("nav");
      x.style.display = "none";
})();

这将使您的myFunction();方法可以在页面加载时使用。

因为这样的菜单通常很合适，并且因为它只有4行，所以您可能要考虑使用第三种方法，如果/当重新加载页面时，它将保持菜单的切换状态：

// self executing function
(function() {
    if(window.localStorage.getItem('nav') === null){
      window.localStorage.setItem('nav', 'none');
    }
    var x = document.getElementById("nav");
    x.style.display = window.localStorage.getItem('nav');
})();

function myFunction() {
    var x = document.getElementById("nav");
    if (x.style.display === "block") {
      x.style.display = "none";
    } else {
      x.style.display = "block";
    }
    window.localStorage.setItem('nav', x.style.display);
}

Answer 2

您可以像这样使用CSS：

#nav{
  display:none;
}

但是，如果您想在身体加载时做一些事情，可以添加如下函数：

<body onload="onload()">

和功能：

function onload() {
  var x = document.getElementById("nav");
  x.style.display = "none";
}

在此处查看： Fiddle

汉堡菜单打开页面加载

2 个答案: