How to Resolve getElementsByClassName() Incompatibility in IE6-8?

IE6-8 Incompatibility with getElementsByClassName() Method

When attempting to use getElementsByClassName() to select elements by their class name in Internet Explorer 6, 7, or 8, you may encounter the error message "Object does not support this method." This is because these older browsers lack the built-in support for this modern DOM method.

Overcoming the Compatibility Issue

To overcome this limitation and enable class-based selection in these browsers, consider implementing a custom solution. The snippet below provides a JavaScript function that replicates the functionality of getElementsByClassName():

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;
};

After adding this code to your web page, you can use document.getElementsByClassName() as usual to retrieve elements by their class names in IE6, IE7, and IE8.

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