Hello,

I am creating a form for a public health department for health appraisals. I was wondering if there was a way for the form to calculate BMI from a persons height and weight. Here is an example:

Height - 6 feet
Weight - 230 pounds

((230)/(72x72))x 703 = 31.19

I'm very novice and scripting and I'm not even sure this is possible. Any help would be greatly appreciated.

You can refer to the 'Calculation Form Example' form on our demo website, it provides a good example for your described scenario:

demo.rsjoomla.com/calculation-form-example
demo.rsjoomla.com/administrator

Trust me I've tried this (for hours)

This is what I ended up with

function calculateText(){

var op1=document.getElementById('Height');

var op2=document.getElementById('Weight');

var result=document.getElementById('BMI');

if(op1.value=="" || op1.value!=parseFloat(op1.value)) op1.value=0;

if(op2.value=="" || op2.value!=parseFloat(op2.value)) op2.value=0;

result.value=0;

result.value=parseInt(result.value);

result.value=((parseInt(op2.value)/(parseInt(op1.value)*(parseInt(op1.value))*703;}


I then put onclick="calculateText();" in the attributes of a "calculate BMI" button and nothing happens when I click it. Very frustrating, I am not a coder.

I was successfully able to get this to work. I will post the script for anyone who would like to use it as a reference:

<script type="text/javascript">
function calculateText(){

var op1=document.getElementById('Height');

var op2=document.getElementById('Weight');

var result=document.getElementById('BMI');

if(op1.value=="" || op1.value!=parseFloat(op1.value)) op1.value=0;

if(op2.value=="" || op2.value!=parseFloat(op2.value)) op2.value=0;

result.value=0;

result.value=parseInt(result.value);

result.value=parseInt(op2.value*703)/parseInt(op1.value*op1.value);}
</script>

I learned a lot about javascript!