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.

Warning: Malicious code can compromise your account. Page preview will cause your web browser to execute this page's content as code under some skins, including Monobook. If you have any questions about any code you plan to add, you can ask at the appropriate reading room.

Documentation for this script can be added at User:Whiteknight/convert.

//<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";
      }
    }
  }
}

$(ConvertUnitsLink);
//</pre>