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htmlcssflexboxparent-childviewport-units

Adjusting flex Footer position (with "translatedY" child elements) on a responsive website


I am trying to make a sticky footer with these premises:

  • footer is position:fixed;
  • its global height changes according to:
    • how many child .sub-menu items the user adds (may vary)
    • the media queries (that change the font-size)
    • the font-size (which is attributed in viewport units "vw")

There are two specific media instances that change the font size:

  • one media query for devices/screens bellow 980px
  • and one for devices/screens above 1550px

I am trying to position the footer always on the bottom of the page while focing its child elements to appear above it. However the number of .sub-menu items is forcing the footer to grow in height; as if that wasn't enough the viewport width is changing the font size, which also affect the height of the element.

h1 {
font-size: 4vw;
letter-spacing: 0.02em;
}
h2, h3, ul.sub-menu {
	font-size:2.3vw;
	 line-height: 1.4em;
	color: black;
}

.footermenu {
        bottom:0vh;
        left:0vw;
        position: fixed;
        width: 95vw;
        padding-right: 5vw; 
    	height: 55vh; /*this seems to help but it is not reliable enough*/
    	z-index:999; 
    }

    .footermenu ul { 
        justify-content: space-between; 
        display: flex;
    }

    .menu-item > ul.sub-menu {  
        padding: 1vh;
        text-align: center;
        flex-direction: column;
        opacity: 1;
        transition: 0.5s ease-out;
    }

    .menu > .menu-item:not(:first-child):not(:last-child), .menu-item:not(:first-child):not(:last-child) > ul.sub-menu {  
        text-align: center !important;
    flex: 0 1 33%;
    -webkit-flex: 0 1 33%;
    }

    .menu > .menu-item:first-child, .menu-item:first-child > ul.sub-menu {  
        text-align: left !important;
    flex: 0 1 33%;
    -webkit-flex: 0 1 33%;
    }

    .menu > .menu-item:last-child, .menu-item:last-child > ul.sub-menu {  
        text-align: right !important;
    flex: 0 1 33%;
    -webkit-flex: 0 1 33%;
    }
    
    /* from here on I am translating the sub-menu items up */

    .footermenu .menu-item:not(:first-child):not(:last-child) > ul.sub-menu {  
    -webkit-transform: translateY(calc(-100% - 15vh));
        transform: translateY(calc(-100% - 15vh));
    }

    .footermenu .menu-item:first-child > ul.sub-menu {  
    -webkit-transform: translateY(calc(-100% - 15vh));
        transform: translateY(calc(-100% - 15vh));
    }

    .footermenu .menu-item:last-child > ul.sub-menu {  
    -webkit-transform: translateY(calc(-100% - 15vh));
        transform: translateY(calc(-100% - 15vh));
    }

@media screen and (max-width: 980px) {
       	 h1 	{
            	font-size:6vw;
    		letter-spacing: 0.02em;
       		 }
       	 h2, h3, ul.sub-menu a {
    		font-size:3.6vw;
    	 	line-height: 1.2em;
    		color: black;
    		}
   
 	
    	#content {
    		margin: auto;
    		width: 68vw
    		margin-top: 25vh;
    		}
    
    }
@media screen and (min-width: 1550px) {
       	 h1 	{
            	font-size:3.5vw;
                letter-spacing: 0.02em;
       		 }
       	 h2, h3, ul.sub-menu a {
    		font-size:2.3vw;
    	 	line-height: 1.2em;
    		color: black;
    		}
    	.post .entry-content {
    		margin-top: 1.5em;
    		text-align:left;
    		-webkit-column-count:1; /* Chrome, Safari, Opera */
       		 -moz-column-count: 1; /* Firefox */
        		column-count: 1;
    		}
    	.footermenu  {
    		z-index:999;		
    		height: 18vh!important; /*I am trying to fix the problem like this  but as said before this is not safe */
    		}
       .post .entry-content { 
    	-webkit-column-count: 3; /* Chrome, Safari, Opera */
        	-moz-column-count: 3; /* Firefox */
        	column-count: 3;
    	}	
    	#content {
    	margin: auto;
    	width: 68vw;
    	margin-top: 25vh;
    	}
    }
 <div id="footer">
    <h1>  
        <div class="footermenu"> 
            <ul id="menu-footer-menu" class="menu">
                <li class="menu-item"><a href="url_4">Contact</a>
              <ul class="sub-menu">
                        <li class="menu-item"><a href="url_6_a">More  Landscapes</a></li>
                <li class="menu-item"><a href="url_6_b">Collection</a></li></ul>
              </li>
                <li class="menu-item"><a href="url_5">Links</a>
              <ul class="sub-menu">
                        <li class="menu-item"><a href="url_6_a">More Landscapes</a></li>
                        <li class="menu-item"><a href="url_6_b">Collection</a></li>
                        <li class="menu-item"><a href="url_6_c">Brave New</a></li>
                        <li class="menu-item"><a href="url_6_d">Line Three</a></li>
                        <li class="menu-item"><a href="url_6_e">Mary's World</a></li>
                    </ul>
              </li>
                <li class="menu-item"><a href="url_6">About</a>
                    <ul class="sub-menu">
                        <li class="menu-item"><a href="url_6_a">More  Landscapes</a></li>
                        <li class="menu-item"><a href="url_6_b">Collection</a></li>
                        <li class="menu-item"><a href="url_6_c">Brave New</a></li>
                        <li class="menu-item"><a href="url_6_d">Line Three</a></li>
                        <li class="menu-item"><a href="url_6_e">Mary's World</a></li>
                    </ul>
                </li>
            </ul>
        </div>
    </h1>
 </div><!-- end of #footer --> 

Would you be able to help me place this footer always on the same position, regardless on the number of sum-menu items, viewport dimensions and font-size?

A php approach for wordpress engine is also welcome. So in summary: I am trying to change the html order of my footer menu in such a way the parent menu item appears after its children. I have done it using CSS "transform: translateY(n)" however this does not solve my problem completely because this method has way too many variables. Many thanks.


Solution

  • Without getting into the specifics of your very detailed requirements, what I think you are essentially wanting the menus to be is botton-up.

    Since you are using flexbox this is just a matter of using flex-direction:column-reverse.

    A general example.

    * {
      margin: 0;
      padding: 0;
    }
    a {
      color: black;
      text-decoration: none;
    }
    ul {
      list-style: none;
    }
    #footer {
      position: fixed;
      bottom: 0;
      width: 100%;
      background: pink;
    }
    .footermenu {
      display: flex;
      justify-content: space-between;
    }
    .footermenu #menu-footer-menu {
      display: flex;
      flex: 1;
      justify-content: space-around;
      text-align: center;
    }
    #menu-footer-menu > li > a {
      color: red;
    }
    .menu-item {
      display: flex;
      flex-direction: column-reverse;
      flex: 1;
    }
    <div id="footer">
      <div class="footermenu">
        <ul id="menu-footer-menu" class="menu">
          <li class="menu-item"><a href="url_4">Contact</a>
    
            <ul class="sub-menu">
              <li class="menu-item"><a href="url_6_a">More  Landscapes</a>
              </li>
              <li class="menu-item"><a href="url_6_b">Collection</a>
              </li>
            </ul>
          </li>
    
          <li class="menu-item"><a href="url_5">Links</a>
    
            <ul class="sub-menu">
              <li class="menu-item"><a href="url_6_a">More Landscapes</a>
              </li>
              <li class="menu-item"><a href="url_6_b">Collection</a>
              </li>
              <li class="menu-item"><a href="url_6_c">Brave New</a>
              </li>
              <li class="menu-item"><a href="url_6_d">Line Three</a>
              </li>
              <li class="menu-item"><a href="url_6_e">Mary's World</a>
              </li>
            </ul>
          </li>
          <li class="menu-item"><a href="url_6">About</a>
            <ul class="sub-menu">
              <li class="menu-item"><a href="url_6_a">More  Landscapes</a>
              </li>
              <li class="menu-item"><a href="url_6_b">Collection</a>
              </li>
              <li class="menu-item"><a href="url_6_c">Brave New</a>
              </li>
              <li class="menu-item"><a href="url_6_d">Line Three</a>
              </li>
              <li class="menu-item"><a href="url_6_e">Mary's World</a>
              </li>
            </ul>
          </li>
        </ul>
      </div>
    </div>
    <!-- end of #footer -->