User:Whiteknight/convert.js

Note: After saving, changes may not occur immediately. Click here to learn how to bypass your browser's cache.

• Mozilla / Firefox / Safari: hold down Shift while clicking Reload, or press Ctrl-Shift-R (Cmd-Shift-R on Apple Mac);
• Internet Explorer: hold Ctrl while clicking Refresh, or press Ctrl-F5;
• Konqueror: simply click the Reload button, or press F5;
• Opera users may need to completely clear their cache in Tools→Preferences.

//<pre>
 
/* Unit conversion Javascript
   Written by [[User:Whiteknight]]
   Automatically convert between different sets of equivalent units
   Especially Metric->American unit conversions.
   Use this script by writing the following into your personal javascript file:
 
 document.write('<script type="text/javascript" src="' 
             + 'http://en.wikibooks.org/w/index.php?title=User:Whiteknight/convert.js' 
             + '&action=raw&ctype=text/javascript&dontcountme=s"></script>');
*/
 
function ConvertUnitsLink() {
  var tb = document.getElementById('p-tb').getElementsByTagName('ul')[0];
  var link = document.createElement('a');
 
  link.onclick = ConvertUnits;
  link.href = "#";
  link.appendChild(document.createTextNode("Convert Units"));
 
  var li = document.createElement('li');
  li.id = "custom-link";
  li.appendChild(link);
  tb.insertBefore(li, tb.firstChild);
}
 
function ConvertUnits()
{
  Convert("Kg", "Lbs", "conv_mass_val", "conv_mass_unit", 2.20);
  Convert("m", "Feet", "conv_dist_val", "conv_dist_unit", 3.28);
}
 
function Convert(munits, iunits, valtag, unittag, mtoifact)
{
  var spanElements = document.getElementsByTagName('span');
  for (i = 0; i < spanElements.length; i++)
  {
    if(spanElements[i].className == valtag)
    {
      var number = parseFloat(spanElements[i].innerHTML);
      var result = 0.0;
      if(spanElements[i].value == "SAE")
      {
        result = number / mtoifact;
        spanElements[i].value = "Metric";
      }
      else
      {
        result = number * mtoifact;
        spanElements[i].value = "SAE";
      }
      spanElements[i].innerHTML = result + '';
    }
    else if(spanElements[i].className == unittag)
    {
      if(spanElements[i].value == "SAE")
      {
    	spanElements[i].innerHTML = munits;
    	spanElements[i].value = "Metric";
      }
      else
      {
        spanElements[i].innerHTML = iunits;
        spanElements[i].value = "SAE";
      }
    }
  }
}
 
addOnloadHook(ConvertUnitsLink);
//</pre>