textWidth function - calculate text width

textWidth.js

// Copied from here: https://stackoverflow.com/a/2771544/1909380
// jQuery function to calculate text width

$.fn.textWidth = function(){
  var html_org = $(this).html();
  var html_calc = '<span>' + html_org + '</span>';
  $(this).html(html_calc);
  var width = $(this).find('span:first').width();
  $(this).html(html_org);
  return width;
};