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Wednesday, June 26, 2013

Chord-changer Javascript

I have written a Javascript program to transpose the guitar chords for a song into a different key. In the lyrics of the song, the guitar chords are supposed to be between <sup> and </sup>. You can try it at Myanmar Lyrics by clicking the Key Up and Key Down buttons. The codes are shown below.
<script type="text/javascript">
//Author: YAN NAING AYE 
//License: Chord-changer Javascript by Yan Naing Aye is licensed
//         under a Creative Commons Attribution 3.0 Unported License.
//  You are free:
//    to Share — to copy, distribute and transmit the work
//    to Remix — to adapt the work
//    to make commercial use of the work
//  Under the following conditions:
//    Attribution — You must attribute Chord-changer Javascript  to Yan Naing Aye (with link).
function ChangeKey(d)
  var y = document.getElementsByTagName("sup");
  var kUp = 0;
  var keyA = ["C", "Db", "D", "Eb", "E", "F", "Gb", "G", "Ab", "A", "Bb", "B"];
  var ki=0;
  var t;
  for (i = 0; i < y.length; i++) 
      nCh = 1;
      var kUp = 0;
      t= y[i].innerHTML;
      if (t.indexOf('b') == 1) 
          nCh =2;          
      else if (t.indexOf('#') == 1)
          nCh =2;
<input type="button" value="Key Up" onclick="ChangeKey(1)"/>
<input type="button" value="Key Down" onclick="ChangeKey(-1)"/>

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