Prototype - down() Method

This method returns element's first descendant or the n-th descendant if index is specified that matches cssRule.

If no cssRule is provided, all descendants are considered. If no descendant matches these criteria, undefined is returned.

Syntax

element.down([cssRule][, index = 0]);

Return Value

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

NOTE − element.down() and element.down(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').down(3).innerHTML );
            alert( "2 : " + $('apples').down('li').innerHTML );
            alert( "3 : " + $('apples').down('li.yummy').innerHTML );
            alert( "4 : " + $('fruits').down('.yummy', 1).innerHTML );
            alert( "5 : " + $('fruits').down(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