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Miles Per Gallon Calculator

A function to calculate gas mileage.

Submitted By: OliveOyl3471
Actions:
Rating:
Views: 253

Language: JavaScript
Last Modified: October 13, 2008
Instructions: Copy and paste the function into the document head. Copy and paste the form into the document body.

Snippet


  1. function calcMPG()
  2. {
  3.         var startMiles = document.forms[0].startingMileage.value;
  4.         var endMiles = document.forms[0].endingMileage.value;
  5.         var gallons = document.forms[0].gallonsUsed.value;
  6.        
  7.         if(isNaN(startMiles) || isNaN(endMiles) || isNaN(gallons))
  8.         {
  9.         window.alert("Each textbox must contain only numbers!");
  10.         }
  11.         else
  12.         {
  13.                 if(gallons > 0)
  14.                 {
  15.                 document.forms[0].milesPerGallon.value = ((endMiles - startMiles)/gallons).toFixed(1);
  16.                 }
  17.         }
  18. }
  19.  
  20. <body>
  21. <script type="text/javascript">
  22. document.write("<p><h2>Miles Per Gallon Calculator</h2></p>");
  23. document.write("<p><h5>To find miles per gallon, enter starting and ending mileage and gallons of gas used.</h5></p>");
  24. </script>
  25.         <form action ="">
  26.                 <p>Starting Miles:<br />
  27.                 <input type = "text" name = "startingMileage" value = "0" size = "10" onchange = "calcMPG()" /></p>
  28.                 <p>Ending Miles:<br />
  29.                 <input type = "text" name = "endingMileage" value = "0" size = "10" onchange = "calcMPG()" /></p>
  30.                 <p>Gallons Used:<br />
  31.                 <input type = "text" name = "gallonsUsed" value = "0" size = "10" onchange = "calcMPG()" /></p>
  32.                 <p>Miles Per Gallon:<br />
  33.                 <input type = "text" name = "milesPerGallon" value = "0" size = "10" /></p>
  34.         </form>       
  35. </body>
  36.  

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Comments


BetaWar 2008-10-13 16:34:40

Note for use: You need to fill in the top 3 fields for the calculation to be done. Interesting snippet :)
OliveOyl3471 2008-10-13 16:46:41

Thank you!
jjsaw5 2008-10-13 20:34:42

very nice Olive!

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