制作相同高度的子菜单和子子菜单

Question

I have a drop-down menu with 3 Levels. What I am trying to achieve is to make the same height of SubMenu and Sub-SubMenu. Both of the menus should have the same height irrespective of items in each column(Sub Menu and Sub-Sub Menu).

Here is the HTML and CSS code which I'm using.

 html { font-family: sans-serif; -webkit-text-size-adjust: 100%; -ms-text-size-adjust: 100%; } * { -webkit-box-sizing: border-box; -moz-box-sizing: border-box; box-sizing: border-box; } *:before, *:after { -webkit-box-sizing: border-box; -moz-box-sizing: border-box; box-sizing: border-box; } * { margin: 0px; padding: 0px; } #main { max-width: 1000px; margin: 0 auto; } #menu:after { content: ""; clear: both; display: block; } #menu { background-color: #000; } #menu ul { list-style: none; position: relative; float: left; margin: 0; padding: 0 } #menu ul a { display: block; color: #231F20; font-size: 12px; } #menu ul li { float: left; margin: 0; padding: 0 } #menu ul li.current { background: #ddd } #menu ul ul { display: none; position: absolute; top: 100%; left: 0; background: #fff; border: 1px solid #4598cc; padding: 20px 0px; z-index: 5; } #menu ul ul li { float: none; width: 200px; padding: 5px 10px; } #menu ul ul a { color: #4598cc; display: block; padding: 5px 0; font-style: 14px; font-family: FFMarkStdBook; } #menu ul ul ul { top: 0; left: 100%; height: 100%; } #menu ul li:hover>ul { display: block } #menu>ul>li { float: left; margin-right: 47px; position: relative; } #menu>ul>li:last-child { margin-right: 0px; } #menu>ul>li>a { color: #fff; text-transform: uppercase; font-size: 14px; padding: 10px; text-decoration: none; } #menu>ul>li>ul b { color: #4598cc; font-size: 14px; text-transform: uppercase; font-weight: normal; } 

 <div id="main"> <nav id="menu"> <ul> <li><a href="#">Home</a></li> <li><a href="#">Services</a> <ul> <li><a href="#">Link One ></a> <ul> <li><a href="#">Child Link One</a></li> <li><a href="#">Child Link One</a></li> <li><a href="#">Child Link One</a></li> <li><a href="#">Child Link One</a></li> <li><a href="#">Child Link One</a></li> <li><a href="#">Child Link One</a></li> </ul> </li> <li><a href="#">Link One ></a> <ul> <li><a href="#">Child Link One</a></li> <li><a href="#">Child Link One</a></li> </ul> </li> <li><a href="#">Link One ></a> <ul> <li><a href="#">Child Link One</a></li> <li><a href="#">Child Link One</a></li> <li><a href="#">Child Link One</a></li> <li><a href="#">Child Link One</a></li> <li><a href="#">Child Link One</a></li> </ul> </li> </ul> </li> <li><a href="#">Projects</a> <ul> <li><a href="#"> Link One</a> <ul> <li><a href="#">Child Link One</a></li> <li><a href="#">Child Link One</a></li> <li><a href="#">Child Link One</a></li> <li><a href="#">Child Link One</a></li> <li><a href="#">Child Link One</a></li> </ul> </li> <li><a href="#"> Link One</a></li> <li><a href="#"> Link One</a></li> </ul> </li> <li><a href="#">Blog</a></li> <li><a href="#">Contact</a></li> </ul> </nav> </div> 

Here is the example screenshot which I want to achieve.

Thanks in advance.

Answer 1

To try to resolve your problem, I used jquery 'cause I could not think a pure CSS solution. So this is only a possible way.

In my solution, for every 1st level <li> I created a loop to get the tallest <ul> in it and I put the result as height of every <ul> in that <li> .

This is the script (see also this: Use jQuery/CSS to find the tallest of all elements ):

$("#menu > ul > li").each(function(){
  var maxHeight = 0;
  var myUl=$("ul", $(this));

  myUl.each(function(){
    maxHeight = maxHeight > $(this).height() ? maxHeight : $(this).height();
  });

  myUl.height(maxHeight);
});

In your CSS, I used visibility:visible & hidden to get the <ul> height (removing your display:none & block ).

This is all code in action. Hope it helps. :)

 $("#menu > ul > li").each(function(){ var maxHeight = 0; var myUl=$("ul", $(this)); myUl.each(function(){ maxHeight = maxHeight > $(this).height() ? maxHeight : $(this).height(); }); myUl.height(maxHeight); }); 

 html { font-family: sans-serif; -webkit-text-size-adjust: 100%; -ms-text-size-adjust: 100%; } * { -webkit-box-sizing: border-box; -moz-box-sizing: border-box; box-sizing: border-box; } *:before, *:after { -webkit-box-sizing: border-box; -moz-box-sizing: border-box; box-sizing: border-box; } * { margin: 0px; padding: 0px; } #main { max-width: 1000px; margin: 0 auto; } #menu:after { content: ""; clear: both; display: block; } #menu { background-color: #000; } #menu ul { list-style: none; position: relative; float: left; margin: 0; padding: 0 } #menu ul a { display: block; color: #231F20; font-size: 12px; } #menu ul li { float: left; margin: 0; padding: 0 } #menu ul li.current { background: #ddd } #menu ul ul { position: absolute; top: 100%; left: 0; background: #ffffff; border: 1px solid #4598cc; padding: 20px 0px; z-index: 5; display:block; visibility:hidden; } #menu ul ul li { float: none; width: 200px; padding: 5px 10px; } #menu ul ul a { color: #4598cc; display: block; padding: 5px 0; font-style: 14px; font-family: FFMarkStdBook; } #menu ul ul ul { top: -1px; left: 100%; height: auto; } #menu ul li:hover>ul { visibility:visible; } #menu>ul>li { float: left; margin-right: 47px; position: relative; } #menu>ul>li:last-child { margin-right: 0px; } #menu>ul>li>a { color: #fff; text-transform: uppercase; font-size: 14px; padding: 10px; text-decoration: none; } #menu>ul>li>ul b { color: #4598cc; font-size: 14px; text-transform: uppercase; font-weight: normal; } 

 <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script> <div id="main"> <nav id="menu"> <ul> <li><a href="#">Home</a></li> <li><a href="#">Services</a> <ul> <li><a href="#">Link One ></a> <ul> <li><a href="#">Child Link One</a></li> <li><a href="#">Child Link One</a></li> <li><a href="#">Child Link One</a></li> <li><a href="#">Child Link One</a></li> <li><a href="#">Child Link One</a></li> <li><a href="#">Child Link One</a></li> </ul> </li> <li><a href="#">Link One ></a> <ul> <li><a href="#">Child Link One</a></li> <li><a href="#">Child Link One</a></li> </ul> </li> <li><a href="#">Link One ></a> <ul> <li><a href="#">Child Link One</a></li> <li><a href="#">Child Link One</a></li> <li><a href="#">Child Link One</a></li> <li><a href="#">Child Link One</a></li> <li><a href="#">Child Link One</a></li> </ul> </li> </ul> </li> <li><a href="#">Projects</a> <ul> <li><a href="#"> Link One</a> <ul> <li><a href="#">Child Link One</a></li> <li><a href="#">Child Link One</a></li> <li><a href="#">Child Link One</a></li> <li><a href="#">Child Link One</a></li> <li><a href="#">Child Link One</a></li> </ul> </li> <li><a href="#"> Link One</a></li> <li><a href="#"> Link One</a></li> </ul> </li> <li><a href="#">Blog</a></li> <li><a href="#">Contact</a></li> </ul> </nav> </div> 

Answer 2

Its the best if you restructure your html.

.dropdown class was added to make easier to target.

Is this what you wanted?

https://jsfiddle.net/q1m0kany/2/

<div id="main">
  <nav id="menu">
    <ul>
      <li><a href="#">Home</a></li>
      <li><a href="#">Services</a>
        <ul class="dropdown">
          <li><a href="#">Link One ></a>
            <ul class="dropdown">
              <li><a href="#">Child Link One</a></li>
              <li><a href="#">Child Link One</a></li>
              <li><a href="#">Child Link One</a></li>
              <li><a href="#">Child Link One</a></li>
              <li><a href="#">Child Link One</a></li>
              <li><a href="#">Child Link One</a></li>
            </ul>
          </li>
          <li><a href="#">Link One ></a>
            <ul class="dropdown">
              <li><a href="#">Child Link One</a></li>
              <li><a href="#">Child Link One</a></li>
            </ul>
          </li>
          <li><a href="#">Link One ></a>
            <ul class="dropdown">
              <li><a href="#">Child Link One</a></li>
              <li><a href="#">Child Link One</a></li>
              <li><a href="#">Child Link One</a></li>
              <li><a href="#">Child Link One</a></li>
              <li><a href="#">Child Link One</a></li>
            </ul>
          </li>
        </ul>
      </li>
      <li><a href="#">Projects</a>
        <ul class="dropdown">
          <li><a href="#"> Link One</a>
            <ul class="dropdown">
              <li><a href="#">Child Link One</a></li>
              <li><a href="#">Child Link One</a></li>
              <li><a href="#">Child Link One</a></li>
              <li><a href="#">Child Link One</a></li>
              <li><a href="#">Child Link One</a></li>
            </ul>
          </li>
          <li><a href="#"> Link One</a></li>
          <li><a href="#"> Link One</a></li>
        </ul>
      </li>
      <li><a href="#">Blog</a></li>
      <li><a href="#">Contact</a></li>
    </ul>
  </nav>
</div>


html {
  font-family: sans-serif;
  -webkit-text-size-adjust: 100%;
  -ms-text-size-adjust: 100%;
}

* {
  -webkit-box-sizing: border-box;
  -moz-box-sizing: border-box;
  box-sizing: border-box;
}

*:before,
*:after {
  -webkit-box-sizing: border-box;
  -moz-box-sizing: border-box;
  box-sizing: border-box;
}

* {
  margin: 0px;
  padding: 0px;
}

#main {
  max-width: 1000px;
  margin: 0 auto;
}

#menu:after {
  content: "";
  clear: both;
  display: block;
}

#menu {
  background-color: #000;
}

#menu ul {
  list-style: none;
  position: relative;
  margin: 0;
  padding: 0
}

#menu ul a {
  display: block;
  font-size: 12px;
  text-decoration: none;
}

#menu ul li {
  margin: 0;
  padding: 0;
  display: block;
}


#menu .dropdown {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  z-index: 5;
}

#menu .dropdown li {
  width: 200px;
  display: block;
  background-color: gray;
  border-bottom: 1px solid black;
}

#menu .dropdown > li > a {
  font-style: 14px;
  padding: 5px;
  color: white;
  font-family: FFMarkStdBook;
}

#menu .dropdown .dropdown {
  top: 0;
  left: 100%;
  height: 100%;
}

#menu ul li:hover > .dropdown {
  display: block
}

#menu>ul>li {
  float: left;
  margin-right: 47px;
  position: relative;
}

#menu>ul>li:last-child {
  margin-right: 0px;
}

#menu>ul>li>a {
  color: #fff;
  text-transform: uppercase;
  font-size: 14px;
  padding: 10px;
  text-decoration: none;
}

#menu>ul>li>ul b {
  color: #4598cc;
  font-size: 14px;
  text-transform: uppercase;
  font-weight: normal;
}