Should I use a form for this

**noritauhidi** · 12-26-2007, 10:20 PM

Hi, I want to create an RMR calculator for my website, I'm not even sure if you would use a form to do this but I'm pretty sure you would. So what I want to do is allow people to put in their sex, age, height and weight, and then I want it to calculate the persons RMR for them, with the formula I put in. So I was wondering what would allow me to add a formula to calculate all these variables that the visitor would add in and then how can I display the results to them.

Thank you very much.

**Watdaflip** · 12-26-2007, 11:26 PM

The best two ways would be to either use php or javascript, either way there is no feature in BV to do this. You are correct that a form is needed, basically a set of text fields and possibly drop down menus, and just taking the values entered for each and making the calculations. But to do the calculations you have to use a programming language like php or javascript (php requiring that the form submit, javascript dynamically making the calculations without the page refreshing

**noritauhidi** · 12-27-2007, 01:11 AM

where would I get a java script code to do this?

**Watdaflip** · 12-27-2007, 01:16 AM

You might be able to find existing code for what you are looking for, a google search will probably provide the best results for that.

Otherwise you have to learn javascript and write the code yourself

**noritauhidi** · 12-27-2007, 05:12 PM

I tried this basic javascript code, asking the visitor to input their weight, height, and age, but when I click calculate it doesn't work, nothing comes up. I keep messing around with it but I can't figure out whats wrong, its my first attempt at a javascript code so I don't really know what I'm doing. Any suggestions?

<html>
<head>
<script language="JavaScript">

</script>
</head>
<body>
<FORM>
<h2>RMR Calculator</h2>
Enter Weight, Height, and Age:
<INPUT NAME="height" VALUE="0" MAXLENGTH="15" SIZE=15>
<p>
<INPUT NAME="weight" VALUE="0" MAXLENGTH="15" SIZE=15>
<p>
<INPUT NAME="age" VALUE="0" MAXLENGTH="15" SIZE=15>
<p>
Click this button to calculate RMR:
<INPUT NAME="rmrcalc" VALUE="Calculate" TYPE=BUTTON onClick=rmrcalc(this.form)
<p>
Your RMR is:
<INPUT NAME="RMR" READONLY SIZE=15>
</FORM>
</body>
</html>

**Watdaflip** · 12-27-2007, 10:36 PM

function rmrcalc(form)
{
var age = 0;
var height = 0;
var weight = 0;
rmr =((5.0033)height + (13.751)weight – age(6.755) + 66.473);
form.rmrcalc.value = cal;
}

should be something more like

function rmrcalc(form)
{
var age = document.form.age.value;
var height = document.form.height.value;
var weight = document.form.weight.value;
document.form.rmrcalc.value =( (5.0033)*height + (13.751)*weight – age*(6.755) + 66.473 );
}

I didn't test this so it might not work

**noritauhidi** · 12-28-2007, 04:46 PM

It didn't work for me, but I appreciate the effort, thanks a lot

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