How to Overcome getElementsByClassName() Issues in Legacy Internet Explorer Browsers?

getElementsByClassName() Compatibility Issues in Legacy Internet Explorer Browsers

Question:

The code below raises an error in Internet Explorer 6, 7, and 8:

var borderTds = document.getElementsByClassName('leftborder');

Problem:

Legacy Internet Explorer browsers like IE6, IE7, and IE8 do not natively support the getElementsByClassName() method. This method is used to select elements based on their class attribute.

Solution:

To overcome this issue, you can use the following workaround to emulate the getElementsByClassName() functionality in these browsers:

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;
}; 

Implementation:

1. Copy the script into your HTML document.
2. After the script has been added, you can use the getElementsByClassName() method as follows:

var borderTds = document.getElementsByClassName('leftborder');

Benefits:

This workaround allows you to select elements by their class in legacy Internet Explorer browsers without relying on external libraries like jQuery.

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