javascript - How to wrap groups of li tags inside ul -

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i have navigation menu contains bunch of li tags , of them having class "sub-item" , want group li tags inside ul navigation :

<ul class='main-menu'>     <li><a href="#">home</a></li>     <li><a href="#">pages</a></li>     <li class='sub-item'><a href="#">_contact us</a></li>     <li class='sub-item'><a href="#">_community</a></li>     <li class='sub-item'><a href="#">_about me</a></li>     <li class='sub-item'><a href="#">_blog</a></li>      <li><a href="#">dropdown </a></li>     <li class='sub-item'><a href="#">_sub menu 1</a></li>     <li class='sub-item'><a href="#">_sub menu 2</a></li>     <li class='sub-item'><a href="#">_sub menu 3</a></li>     <li class='sub-item'><a href="#">_sub menu 4</a></li>     <li><a href="#">sign out</a></li> </ul>

will become :

<ul id='main-menu'>     <li><a href="#">home</a></li>      <li><a href="#">pages</a></li>     <ul class="sub-menu">       <li class='sub-item'><a href="#">_contact us</a></li>       <li class='sub-item'><a href="#">_community</a></li>       <li class='sub-item'><a href="#">_about me</a></li>       <li class='sub-item'><a href="#">_blog</a></li>     </ul>      <li><a href="#">dropdown </a></li>     <ul class="sub-menu">       <li class='sub-item'><a href="#">_sub menu 1</a></li>       <li class='sub-item'><a href="#">_sub menu 2</a></li>       <li class='sub-item'><a href="#">_sub menu 3</a></li>       <li class='sub-item'><a href="#">_sub menu 4</a></li>     </ul>      <li><a href="#">sign out</a></li> </ul>

this attempt unfortunately didn't worked :

$('.main-menu li a').each(function() {   var $this = $(this),     content = $this.text();    if (content.indexof('_') != -1) {     $this.parent('li').addclass('sub-item');   }  }); $('.sub-item').wrapall('<ul class="sub-menu"></ul>');

here jsfiddle demo : http://jsfiddle.net/hc05fhxr/1/

the desired output given in question invalid li can't have ul content.

i possible alternate add new ul descendant of previous anchor

$('li:not(.sub-item)').each(function() {    var $li = $(this),      $subs = $li.nextuntil(':not(.sub-item)');    if ($subs.length) {      $('<ul />', {        'class': 'sub-menu'      }).html($subs).appendto($li);    }  })
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>  <ul class='main-menu'>    <li><a href="#">home</a></li>    <li><a href="#">pages</a></li>    <li class='sub-item'><a href="#">contact us</a></li>    <li class='sub-item'><a href="#">community</a></li>    <li class='sub-item'><a href="#">about me</a></li>    <li class='sub-item'><a href="#">blog</a></li>      <li><a href="#">dropdown </a></li>    <li class='sub-item'><a href="#">sub menu 1</a></li>    <li class='sub-item'><a href="#">sub menu 2</a></li>    <li class='sub-item'><a href="#">sub menu 3</a></li>    <li class='sub-item'><a href="#">sub menu 4</a></li>    <li><a href="#">sign out</a></li>  </ul>


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