Form Calculation Help

kehwon · May 24, 2019

I'm trying to create a form that allows for calculation of metabolic rate.

There is an if,then statement related to gender (formula changes if female vs male)

I'd also like the result to be targeted to a specific part of the page (anchor). Ideally a new section can appear (maybe need to link a new page?) to provide further details

Below is my code, any help would be so appreciated!!

  <head>
   <style>

body {
      font:   15px gothic, sans-serif;
      letter-spacing: 1px;
      }
   input {
  width: 100%;
}
input[type=number] {
  border: none;
  border-bottom: 1px solid grey;
}
input[type=button], input[type=submit], input[type=reset] {
  background-color: #ddcecb;
  border: none;
 -moz-border-radius: 5px;
 -webkit-border-radius: 5px;
  color: #95483e;
  padding: 16px 32px;
  text-decoration: none;
  letter-spacing: 1px;
  margin: 4px 2px;

#submit:hover {
 border: none;
 background: #d2d1d1;
 box-shadow: 0px 0px 1px #777;
}}
input[type=text]:focus {
  border: 1px solid #555;
}
.form-inline label {
  margin: 5px 10px 5px 0;
}
@media (max-width: 800px) {
  .form-inline input {
    margin: 10px 0;
  }

  .form-inline {
    flex-direction: column;
    align-items: stretch;
  }
</style>
  </head>

<form name="RMRcalc">
  weight (kg) :
  <input type="number" name="weight" autofocus><br><br>
  height (cm):
  <input type="number" name="height"> <br><br>
  age (years):
  <input type="number" name="age"> <br><br>
activity Level:
<select name="activity" margin=5px >
  <option value="1.2">sedentary (1-2x/week)</option>
  <option value="1.3">low (2-3x/week)</option>
  <option value="1.4">moderate (3-4x/week)</option>
  <option value="1.6">high (5+x/week)</option>
</select>
<br><br>
  female <input type="radio" name="gender" value="female" checked> 
<br> 
 male <input type="radio" name="gender" value="male">  <br>
<input type="submit" value="Calculate" id="calculate" onclick="RMRCalc ()" target="results">
<br><br>

    <script type="text/javascript">
    "use strict"
    function RMRCalc () {
    var weight = document.getElementById ("weight").value;
    var height = document.getElementById("height").value;
    var age = document.getElementById("age").value;
    var activity = document.getElementById("activity").value;
    if (gender="female") var RMR = (10*weight) + (6.25*height) - (5*age) -161;
    document.getElementById("RMR").innerHTML=RMR;
else var RMR = (10*weight) + (6.25*height) - (5*age) +5; document.getElementById("RMR").innerHTML=RMR;
    }
    </script>
</form>

<p><a name="results">
Your Daily Caloric Requirements:
<div id ="RMR"></div>

</a></p>
<br>

<p>
Did you know that

Thank you!!

JMRKER · May 29, 2019

You had a number of syntax errors in the CSS and JS you provided.
I fixed them as best I could understand your logic and keeping most of your original code.
Of most important:
1) You cannot reference and ID without naming the ID in the element and
2) You cannot make a comparison (if...) with an assignment (=, should be ==)

Note that your calculation DO NOT take into account any of the activity selections. Oversight?

	<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width-device-width,initial-scale=1.0, user-scalable=yes"/>
<title> HTML5 Test Page </title>
<!-- From: http://w3schools.invisionzone.com/topic/59183-form-calculation-help/ -->
	<style>
body {
      font:   15px gothic, sans-serif;
      letter-spacing: 1px;
      }
input { width: 100%; }
input[type=number] {
  border: none;
  border-bottom: 1px solid grey;
}
input[type=button], input[type=submit], input[type=reset] {
  background-color: #ddcecb;
  border: none;
 -moz-border-radius: 5px;
 -webkit-border-radius: 5px;
  color: #95483e;
  padding: 16px 32px;
  text-decoration: none;
  letter-spacing: 1px;
  margin: 4px 2px;
	#submit:hover {
 border: none;
 background: #d2d1d1;
 box-shadow: 0px 0px 1px #777;
}
input[type=text]:focus { border: 1px solid #555; }
.form-inline label { margin: 5px 10px 5px 0; }
	@media (max-width: 800px) {
  .form-inline input {
    margin: 10px 0;
  }
  .form-inline {
    flex-direction: column;
    align-items: stretch;
  }
}
</style>
	</head>
<body>
	<form name="RMRcalc" action="javascript:alert('Success')" method="post">
  weight (kg) :   <input type="number" name="weight" id="weight" autofocus><br><br>
  height (cm):    <input type="number" name="height" id="height" > <br><br>
  age (years):    <input type="number" name="age" id="age" > <br><br>
	activity Level:
<select name="activity" id="activity">
  <option value="1.2">sedentary (1-2x/week)</option>
  <option value="1.3">low (2-3x/week)</option>
  <option value="1.4">moderate (3-4x/week)</option>
  <option value="1.6">high (5+x/week)</option>
</select>
<br><br>  female <input type="radio" name="gender" value="female" checked>
    <br>  male <input type="radio" name="gender" value="male">
	<br> <input type="submit" value="Calculate" id="calculate" onclick="return RMRCalc()" target="results">
<br><br>
	</form>
	<p><a name="results">
Your Daily Caloric Requirements:
<div id ="RMR"></div>
	</a></p>
<br>
	<p>
Did you know that
	<script>
"use strict"
function RMRCalc () {
  var weight = document.getElementById ("weight").value;
  var height = document.getElementById("height").value;
  var age = document.getElementById("age").value;
  var activity = document.getElementById("activity").value;
  var RMR;
  if (document.RMRcalc.gender.value == "female") { RMR = (10*weight) + (6.25*height) - (5*age) -161; }
                                            else { RMR = (10*weight) + (6.25*height) - (5*age) +5; }
  document.getElementById("RMR").innerHTML=RMR;
  return false;
}
</script>
</body>
</html>

Modify as necessary. Good Luck!

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