jQuery Simple Example

by Vloxxity

HTML

<script src="//www.addressfinder.co.nz/assets/v2/widget.js"></script>
<ul>
  <li><a href="https://www.youtube.com/watch?v=DLzxrzFCyOs">video1</a></li>
  <li><a href="https://www.youtube.com/watch?v=oXBxfmGoVkg">video1</a></li>
  <li><a href="https://www.youtube.com/watch?v=DLzxrzFCyOs">video1</a></li>
  <li><a href="https://www.youtube.com/watch?v=_juOU5vQkHo">video1</a></li>
  <li><a href="https://www.youtube.com/watch?v=IAISUDbjXj0">video1</a></li>
</ul>

CSS

.rickroll {
  color: red;
}

.rickroll::before {
  content: "[RickRoll] ";
}

JavaScript

$(document).ready(function() {
  $("a").each(function(index) {
  
    var substrings = ['DLzxrzFCyOs','uxIsiTo4VJo','IAISUDbjXj0'],
    length = substrings.length;
    while(length--) {
       if ($(this).attr('href').indexOf(substrings[length])!=-1) {
           console.log( "ALARM" );
           $(this).addClass("rickroll");
       }
    }
  });
});