JSFiddle - React, Tailwind, and code Playground

by jeffsturgis

HTML

<div>
    <h1>head tag here</h1>
    <ul>
        <li class="findMe">item</li>
        <li class="findMe">item</li>
        <li class="findMeTo">item</li>
        <li>item</li>
        <li>item</li>
        <li>item</li>
    </ul>
    <p>
        outside of a span
        <span class="findMe">this is in a span</span>
    </p>
</div>

JavaScript

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;
}