javascript - the <ul> isn't collapsing , only extending -


the problem when press on <a>categories</a> <ul> extending when press again nothing

in css file have set display:none;

i have in php/html page

<html> <head> ... <script src="javascript/collapse.js"></script> ... </head>  <body>...<ul>    <a href="#" onclick="collapse('id1')">categories</a>    <ul id="id1">     <li>       <a href="#">business</a>     </li>     <li>       <a href="home.php">entertainment</a>     </li>     <li>       <a href="home.php">social media</a>     </li>     <li>       <a href="home.php">others</a>     </li>   </ul> </ul>...</html>

and in collapse.js file

function collapse(id){     var e = document.getelementbyid(id);     if(e.style.display="block")         e.style.display="none";     if(e.style.display="none")         e.style.display="block"; };

i need use html,css , javascript , no others frameworks or libraries

first should use triple equals comparisions in javascript. second, should use else if statement, otherwise second if negate first one:

if(e.style.display === "block"){   e.style.display="none"; } else if (e.style.display === "none") {   e.style.display="block"; }

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