Javascript 如何在html/css中创建下拉式登录菜单_Javascript_Html_Css

Javascript 如何在html/css中创建下拉式登录菜单

javascript html css

Javascript 如何在html/css中创建下拉式登录菜单,javascript,html,css,Javascript,Html,Css,我正在尝试用html/css制作一个下拉式登录/注册表单，我希望它从我已经创建的导航栏中下拉，但我无法使它正常工作。有人能给我一些提示，告诉我我做错了什么吗这是我正在创建的页面的一部分或者这是我的代码：：html HTML: 非常感谢，我想这就是我要找的，很抱歉打扰你，但有一个问题，当我悬停在下拉部分时，它显示在我为我的网站设置的div后面，我根本看不到它。它与z-index有任何关系吗？也许我对html/CSS比较陌生。你设置的div的z-index是否比1大? 用最新的提琴在你

我正在尝试用html/css制作一个下拉式登录/注册表单，我希望它从我已经创建的导航栏中下拉，但我无法使它正常工作。有人能给我一些提示，告诉我我做错了什么吗

这是我正在创建的页面的一部分

或者这是我的代码：

：html

HTML:

非常感谢，我想这就是我要找的，很抱歉打扰你，但有一个问题，当我悬停在下拉部分时，它显示在我为我的网站设置的div后面，我根本看不到它。它与z-index有任何关系吗？也许我对html/CSS比较陌生。你设置的div的z-index是否比1大? 用最新的提琴在你的帖子上发布编辑

  <title>MVBT FFA Chapter</title>
 <head>


 </head>




 <div id="header">
<a id="addpost"href="editnews.html">+</a>
      <center><img src="ffaheader.png" alt-"ffa header image" width="70%"       height="40%"></center>
 </div>

  <div id="nav">

  <ul>
    <li><a href="file:///E:/ffachapterpage/home.html">Home</a></li>
    <li><a href="file:///E:/ffachapterpage/events.html">Events</a></li>
    <li><a href="file:///E:/ffachapterpage/contact.html">Contact</a></li>
    <li><a href="file:///E:/ffachapterpage/donate.html">Donate</a></li>
    <li><a href="file:///E:/ffachapterpage/about.html">About</a></li>
    <div class="dropdown">
 <button onclick="dropdown()" class="dropbtn">Dropdown</button>
   <div id="myDropdown" class="dropdown-content">
 <input type="text" placeholder="email">
 <p>Password<p>
 <br/>
 <input type="password" placeholder="password">
   </div>
 </div>





 </body>
 </html>

  <script>
  function dropdown() {
      document.getElementById("myDropdown").classList.toggle("show");
  }    
  </script>
  </ul>









  <body>









 </div>

  <body bgcolor="grey">


       <div id="bodydiv">

          <iframe src="file:///E:/ffachapterpage/newscontent.html"></iframe>




      </div>



  </body>  




   </html>

    .dropbtn {
        background-color: #4CAF50;
        color: white;
        padding: 16px;
        font-size: 16px;
        border: none;
        cursor: pointer;
    }

    .dropbtn:hover, .dropbtn:focus {
        background-color: #3e8e41;
    }

    .dropdown {

        align-content:  right;
        position: relative;

    }

    .dropdown-content {
         width: 1000px;
        height: 500px;
        padding:5px;
        display: none;
        position: absolute;
        background-color:  blue;
        min-width: 160px;
        overflow: auto;
        box-shadow: 0px 0px 3px 16px rgba(0,0,0,0.2);
    }

    .dropdown-content a {
        color: black;
        padding: 12px 16px;
        text-decoration: none;
        display: block;
    }

    .dropdown a:hover {background-color: blue}

    .show {display:block;}

    #sidebarleft{
    width:20%;
    height:100%;
    background:grey;


    }
        #addpost{
            text-decoration: none;
            margin-top: 20px;
            margin-left: 20px;
        }
        #addpost:hover{
          font-size: 20px;
          color:grey;

        }

        #newsframe{
           padding-left:20%;
           width:65%;
           height:100%;
           border:10px;

    }

     #header{
         background: #fcec5d;


      }







    ul {
        list-style-type: none;
        margin: 0;
        padding: 0;
        overflow: hidden;
        background-color: #fbec5d;
    }

    li {
        float: left;
    }

    li a {
        display: inline-block;
        color: blue;
        text-align: center;
        padding: 14px 16px;
        text-decoration: none;
    }

    li a:hover {
    background-color: grey;
    }


    #nav{
    width:100%;
    height:46px;
    background:#fbec5d;
    }
    #headerimage{
        width:100%;
        height:35%;
        display:flex;

   }
   #bodydiv{

        width:100%;
        height:100%;
        background:blue;
        display:flex;




 }

<div class="container">
  <li><a href="file:///E:/ffachapterpage/home.html">Home</a></li>
  <li><a href="file:///E:/ffachapterpage/events.html">Events</a></li>
  <li><a href="file:///E:/ffachapterpage/contact.html">Contact</a></li>
  <li><a href="file:///E:/ffachapterpage/donate.html">Donate</a></li>
  <li><a href="file:///E:/ffachapterpage/about.html">About</a></li>
  <div class="dropdown">
    <span>Your dropdown text</span>
    <div class="dropdown-content">
        <label class="margin-bottom-5">Email: <label><br>
       <input class="margin-bottom-5" type="text" placeholder="email"><br>
       <label class="margin-bottom-5">Password: <label><br>
       <input class="margin-bottom-5" type="password" placeholder="password"><br>
       <input class="margin-bottom-5" type="submit" value="Connect"/>
    </div>
  </div>
</div>

/* When the .dropdown div gets hovered, 
we change the display property of the dropdown
content in order for it to be shown */
.dropdown:hover .dropdown-content {
    display: block;
}


/* "An element with position: relative; 
is positioned relative to its normal position" */
.dropdown {
    position: relative;
    display: inline-block;
}

/*"An element with position: absolute; is positioned 
relative to the nearest positioned ancestor"
In this case, it's positioned relative to the 
.dropdown div. I then played with the
left and top properties in order to align it properly
*/
.dropdown-content {
    display: none;
    position: absolute;
    left:0px;
    top:46px;
    background-color: #f9f9f9;
    min-width: 160px;
    padding: 12px 16px;
    z-index: 1;
    border:1px solid black;
}

/*Under this comment, it's mostly for styles. You can ignore what's below*/
a:hover {
  background-color: grey;
 }

li {
    list-style-type: none;
    overflow: hidden;
}

li {
    float: left;
}

li a, .dropdown{
    display: inline-block;
    color: black;
    text-align: center;
    padding: 14px 16px;
    text-decoration: none;
}

li a:hover, .dropdown:hover{
    background-color: grey;
}

.margin-bottom-5 {
  margin-bottom: 5px;
}

.container {
  border:1px solid black;
}