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The $A() function converts the single argument it receives into an Array object.
One suggested use is to convert DOM NodeLists into regular arrays, which can be traversed more efficiently.
$A(iterable) |
<html> <head> <title>Prototype examples</title> <script type="text/javascript" src="/javascript/prototype.js"> </script> <script> function showOptions(){ var NodeList = $('employees').getElementsByTagName('option'); var nodes = $A(NodeList); nodes.each(function(node){ alert(node.nodeName + ': ' + node.innerHTML); }); } </script> </head> <body> <select id="employees" size="10" > <option value="5">Mohtashim, Mohd</option> <option value="8">Debi, Patnaik</option> <option value="1">Madisetti, Praveen</option> </select> <br /> <input type="button" value="Show the options" onclick="showOptions();"/> </body> </html> |
To understand it in better way you can Try it yourself.
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