Appending javascript to weight/height to meters and kikograms

newbanks · 02-06-2012, 01:14 PM

I have this working figuring BMI in lbs and Inches. I need to incorporate a prompt box asking S for Standard and M for Metric, IF S is selected then it will perform calculation as follows: bmi=weight * 703/ (height * height), If M is chosen then calculation will be: bmi=weight/(height * height) Here is what I have so far:

<!DOCTYPE html PUBLIC"-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtlm1/DTD/xhtml1-strict.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">

<head>
<script type="text/javascript">

/*<![cdata[*/
//state the variable

var weight=prompt("Please enter your weight in lbs.");
var height=prompt("Please enter your height in inches");
var BMI = weight *703/(height * height);
weight = parseInt(weight);
height = parseInt(height);

if (BMI <18.5)
{
document.write("Your are Underweight for your Height and Weight");
}
else if (BMI <= 24.9)
{
document.write ("<p> You are of Normal Weight for your Height and Weight</p>");
}

else if (BMI <= 29.9)
{
document.write ("<p> You are overweight for your Height and Weight</p>");
}

else if (BMI >=30)
{
document.write ("<p> You are considered Obese for your Height and Weight</p>");
}

/*]]>*/

</script>
</head>
<body>
</body>
</html>

felgall · 02-07-2012, 01:26 AM

Take a look at http://javascript.about.com/library/blbmi1.htm - it uses a form inside the actual web page rather than a series of prompts to collect the information and also allows the selection you want between standard metric and american measures.