getElementsByClass(searchClass,node,tag)
A quick and elegant way of grabbing elements by a className by Dustin Diaz
Supply a class name as a string.
(optional) Supply a node. This can be obtained by getElementById, or simply by just throwing in document (it will be document if dont supply a node)). Its mainly useful if you know your parent and you dont want to loop through the entire D.O.M.
(optional) Limit your results by adding a tagName. Very useful when youre toggling checkboxes and etcetera. You could just supply input.
function getElementsByClass(searchClass,node,tag) { var classElements = new Array(); if ( node == null ) node = document; if ( tag == null ) tag = '*'; var els = node.getElementsByTagName(tag); var elsLen = els.length; var pattern = new RegExp("(^|\\s)"+searchClass+"(\\s|$)"); for (i = 0, j = 0; i < elsLen; i++) { if ( pattern.test(els[i].className) ) { classElements[j] = els[i]; j++; } } return classElements; }
Here is a sample useage:
<html> <head> <title>getElementsByClass</title> <script type="text/javascript"> <!-- function showFoo() { var el = getElementsByClass(document,'foo','*'); alert(el.length); } //--> </script> </head> <body> <div id="wrapper"> <div> <p>Searching <span class="foo">foo</span></p> <p class="foo">foo</p> <p class="bar Foo">boo Far</p> <p class="bar foo">boo far</p> <p class="foo bar">foo bar</p> <p class="fooo">fooo</p> <p class="foobar">foobar</p> <p class="bar foo bars">bar foo bars</p> <p class="boofar">boofar</p> <button onclick="showFoo();">Show Total foo</button> </div> </body>
Pushing the button shows "5"
See also:
file: /Techref/inet/iis/jscript/htm/getElementsByClass.htm, 2KB, , updated: 2005/12/9 16:41, local time: 2024/10/7 17:29,
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