truncate based off offscreen

gistfile1.txt

  function truncateText(string, nMaxChars) {
    if (string.length <= nMaxChars)
      return string;

    var xMaxFit = nMaxChars - 3;
    var xTruncateAt = string.lastIndexOf(' ', xMaxFit);
    if (xTruncateAt == -1 || xTruncateAt < nMaxChars / 2)
      xTruncateAt = xMaxFit;

    return string.substr(0, xTruncateAt) + "&hellip;";
  }

  function makeKnob(width, label) {
    var knob = $('<div class="colorslider-knob-wrapper"><div class="colorslider-knob"></div>');
    var offscreen = $('<div></div>').css({'position': 'absolute', 'top': '-999px', 'left': '-999px'}).appendTo('body');
    offscreen.width(knob.width()).html(label);
    if (offscreen.height() > 40) {
      label = ED.util.truncateText(label, 20);
    }
  }