jquery - Printing element width in javascript -


i'm trying retrieve html element width in javascript. nothing appears on screen(plain text works, suppose there's wrong syntax). doing wrong? thanks

<head> <script type="text/javascript">     var width = $("#menu").width();     document.write(width); </script> </head>  <body>     <h1> example </h1>  <ul id = "menu">     <li><img src="img/logo.jpg"/></li>     <li><a href ="#">home</a>         <ul class = "sub1">             <li><a href ="#">news</a></li>         </ul>     </li>     <li><a href ="#">machines</a>         <ul class = "sub1">             <li><a href ="#">type1</a></li>             <li><a href ="#">type2</a></li>             <li><a href ="#">type3</a></li>         </ul>     </li>     <li><a href ="#">mission</a></li>     <li><a href ="#">contacts</a></li> </ul>  <div id "main">     <h2> whatever </h2> </div> </body>

you're computing , printing width when element doesn't yet exist.

you can :

<div id=head></div> <script type="text/javascript">      $(function(){ // called when dom ready           var width = $("#menu").width();           $('#head').html(width);      }); </script>

as saw, used div instead of head, because setting content of head width doesn't make sense. if want change title of page, use

document.title = width;

as noticed j08691, use jquery don't seem import it. if code show real header, need add in head element :

<script src="//ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js"></script>

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