JavaScript: Calculator Script

Main Calculator Script Body Mass Index

<!-- TWO STEPS TO INSTALL BODY MASS INDEX:

1.  Copy this part of code inside your HTML HEAD

2.  Add the last code into the BODY of your HTML document  -->

<HEAD><title>JavaScript, java script, javascripts, script, javascript free code!</title>

<!-- Begin

function mod(div,base) {

return Math.round(div - (Math.floor(div/base)*base));

}

function calcBmi() {

var w = document.bmi.weight.value * 1;

var HeightFeetInt = document.bmi.htf.value * 1;

var HeightInchesInt = document.bmi.hti.value * 1;

HeightFeetConvert = HeightFeetInt * 12;

h = HeightFeetConvert + HeightInchesInt;

displaybmi = (Math.round((w * 703) / (h * h)));

var rvalue = true;

if ( (w <= 35) || (w >= 500)  || (h <= 48) || (h >= 120) ) {

alert ("Invalid data.  Please check and re-enter!");

rvalue = false;

}

if (rvalue) {

if (HeightInchesInt > 11) {

reminderinches = mod(HeightInchesInt,12);

document.bmi.hti.value = reminderinches;

document.bmi.htf.value = HeightFeetInt +

((HeightInchesInt - reminderinches)/12);

document.bmi.answer.value = displaybmi;

}

if (displaybmi <19)

document.bmi.comment.value = "Underweight";

if (displaybmi >=19 && displaybmi <=25)

document.bmi.comment.value = "Desirable";

if (displaybmi >=26 && displaybmi <=29)

document.bmi.comment.value = "prone to health risks";

if (displaybmi >=30 && displaybmi <=40)

document.bmi.comment.value = "Obese";

if (displaybmi >40)

document.bmi.comment.value = "Extremely obese";

document.bmi.answer.value = displaybmi; }

return rvalue;

}

//  End -->

</script>

</HEAD>

<BODY>

<tr>

<td align=center><B>Weight:</B>

</tr>

<tr>

<td align=center><B>Height:</B>

<input type=text name=htf size=1 maxlength=1> Ft.

<input type=text name=hti size=2 maxlength=2> In.

</td>

</tr>

<tr>

</tr>

<tr>

<td><B>Body Mass Index</B>

</td>

</tr>

<tr>

<td>

According to the Panel on Energy, Obesity, and

Body Weight Standards published by American

Journal of Clinical Nutrition, your category is:<br>

</td>

</tr>

</table>

</center>

</form>

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</center><p>

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