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Prototype down() Method

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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:

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>

To understand it in better way you can Try it yourself.


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