Prototype - up() Method

Returns element's first ancestor (or the index'th ancestor, if index is specified) that matches cssRule.

If no cssRule is provided, all ancestors are considered. If no ancestor matches these criteria, undefined is returned.

Syntax

element.up([cssRule][, index = 0])

Return Value

Found HTMLElement.
undefined in case it does not find any element.

NOTE − element.up() and element.up(0) are equivalent.

Example

<html>
   <head>
      <title>Prototype examples</title>
      <script type = "text/javascript" src = "/javascript/prototype.js"></script>
      
      <script>
         function showResult() {
            alert( "1 : " + $('fruits').up(1).innerHTML );
            alert( "2 : " + $('mcintosh').up('li').innerHTML );
            alert( "5 : " + $('fruits').up(99) );
         }
      </script>
   </head>

   <body>
      <p>Click the button to see the result.</p>
      
      <ul id = "fruits">
         <li id = "apples">
            <ul>
               <li id = "golden-delicious">Golden Delicious</li>
               <li id = "mutsu" class = "yummy">Mutsu</li>
               <li id = "mcintosh" class = "yummy">McIntosh</li>
               <li id = "ida-red">Ida Red</li>
            </ul>
         </li>
      </ul>
      <br />
      
      <input type = "button" value = "showResult" onclick = "showResult();"/>
   </body>
</html>

Output

prototype_element_object.htm