javascript - How do I keep animated links underlined for the current page? -


i'm building nav menu links underlined on hover. when link clicked want underline remain, , not animate again current page.

here's have far.

header ul li a:after {     content: '';     display: block;     height: 3px;     width: 0px;     background: transparent;     transition: width .3s ease, background-color .3s ease;     margin: 14px 0px 0px 0px; }  header ul li a:hover:after {     width: 100%;     background: #fff;  }

this code add underline when link hovered. i've tried keeping link underlined current page javascript, doesn't produce desired affect.

document.getelementbyid('contact-link').style.borderbottom = '3px solid  white';   document.getelementbyid('contact-link').style.paddingbottom = '0px';

here example want i'm trying accomplish. https://rocketlabusa.com/

i works if add class on click...

$("header ul li a").on("click", function(){    $(this).addclass("visited");  });
body{    background-color:black;  }    header ul li a:after {      content: '';      display: block;      height: 3px;      width: 0px;      background: transparent;      transition: width .3s ease, background-color .3s ease;      margin: 14px 0px 0px 0px;  }    header ul li a:hover:after {      width: 100%;      background: #fff;  }    header ul li a.visited:after {      width: 100%;      background: #fff;  } 
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>    <header>    <ul>      <li>    <a href="https://stackoverflow.com/questions/45679020/how-do-i-keep-animated-links-underlined-for-the-current-page" target="blank">hello</a>      </li>    </ul>  </header>


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