How to Get Elements by Class Name in Older Internet Explorer Versions (IE6, IE7, IE8)?

Getting Elements by Class Name in Old Internet Explorers (IE6, IE7, IE8)

Problem:

The getElementsByClassName() method returns an error in Internet Explorer 6, 7, and 8 due to a lack of support for this method.

Solution:

For browsers that do not support getElementsByClassName(), use the following alternative method:

<code class="javascript">document.getElementsByClassName = function(cl) {
  var retnode = [];
  var elem = this.getElementsByTagName('*');
  for (var i = 0; i < elem.length; i++) {
    if((' ' + elem[i].className + ' ').indexOf(' ' + cl + ' ') > -1) retnode.push(elem[i]);
  }
  return retnode;
};</code>

This script iterates through all elements on the page using getElementsByTagName('*') and checks if the class name of each element includes the specified class using indexOf(). If a class name match is found, the element is added to the retnode array. The resulting array contains all elements with the specified class name.

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