CSS Time to Milliseconds - useful for timing functions around CSS animations

css_time_to_milliseconds.js

/* 
 * CSS Time to Milliseconds
 * by Jake Bellacera (http://jakebellacera.com)
 * ============================================
 * 
 * Converts CSS time into milliseconds. Useful for timing functions around CSS animations.
 * It supports both seconds (s) and milliseconds (ms).
 * 
 * Arguments:
 *   time_string - string representation of a CSS time unit (e.g. "1500ms" or "1.5s")
 * 
 * Returns:
 *   Time (in milliseconds) as an Integer. Invalid inputs will return 0 milliseconds.
 * 
 * Example:
 *   var miliseconds = css_time_to_milliseconds(myELement.style.transitionDuration);
 *   
 *   setTimeout(function () {
 *     alert('Animation complete!');
 *   }, milliseconds);
 */
function css_time_to_milliseconds(time_string) {
  var num = parseFloat(time_string, 10),
      unit = time_string.match(/m?s/),
      milliseconds;

  if (unit) {
    unit = unit[0];
  }

  switch (unit) {
    case "s": // seconds
      milliseconds = num * 1000;
      break;
    case "ms": // milliseconds
      milliseconds = num;
      break;
    default:
      milliseconds = 0;
      break;
  }

  return milliseconds;
}