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Javascript help!

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Join Date: Apr 2006

Location: Sydney, Australia

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viet_mafia viet_mafia is offline

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Javascript help!

Mar 20th, 2007

Hi everyone, I'm pretty new to Javascript and I guess I'm pretty nooby at it so I have a problem with some Javascript I'm trying to write. Basically I'm creating some Javascript that will allow me to calculate someone's Body Mass Index (BMI) and so far with my code have absolutely no idea what's wrong with it. If you guys could lead me in the right direction it would be much appreciated :cheesy:

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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
  "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> 

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

<head><title>BMI Calculator</title>

 <script type="javascript">
 <!-- Hide script from non-script-friendly browsers
  function BMI Calculator(bmi)
  {
    var bmi = w / (h*h);
    return bmi;
  }
 //stop hiding the script-->
 </script>
</head>

<body>
<script type="javascript">
    <!-- Hide script from non-script-friendly browsers
    var n;
    var a;
    var h;
    var w;
    var bmi;
    n = prompt("What is your age? ","");
    if (n <= 17)
    {
    document.write("We are unable to calculate your BMI");
    }
    else if(age => 18)
    {
    h = prompt("What is your height in metres?","");
    w = prompt("What is your weight in kilograms?","");
    bmi = w / (h*h);

    if (bmi <= 19)
    { 
    message = "Underweight"; 
    }
    else if (bmi >= 20 && bmi <= 25)
    { 
    message = "Acceptable"; 
    }
    else if (bmi >= 26 && <=30)
    { 
    message = "Overweight"; 
    }
    else if (bmi >= 31)
    { 
    message = "Obese"; 
    }
    else
    { 
    message = "Error!"; 
    }

    content = ("<html><head><title>Your BMI</title></head><body><h1>BODY MASS INDEX (BMI) CALCULATOR</h1>
    <p>Your height= " + h + "<br>Your weight= " + w + <br>Your BMI= " + bmi + "</p>
    <p><h2>what your BMI Indicates</h2><br>" + message + ";

    document.write(content);
    }
    // stop hiding the script-->
</script>
</body>
</html>