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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]);
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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>
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To understand it in better way you can Try it yourself.
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