// BMR

// Copyright © 2004 - www.linear-software.com All Rights Reserved

//



function formHandler()

{

  var URL =

    document.form.site.options[document.form.site.selectedIndex].value;

  window.location.href = URL;

}



//-------------------------- AJAX stuff ---------------------------------------



function getHTTPObject() {

  var xmlhttp;

  /*@cc_on

    @if (@_jscript_version >= 5)

    try {

    xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");

    } catch (e) {

    try {

    xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");

    } catch (E) {

    xmlhttp = false;

    }

    }

    @else

    xmlhttp = false;

    @end @*/



  if (!xmlhttp && typeof XMLHttpRequest != 'undefined') {

    try {

      xmlhttp = new XMLHttpRequest();

    } catch (e) {

      xmlhttp = false;

    }

  }

  return xmlhttp;

}



var http = getHTTPObject(); // We create the HTTP Object 

var script_url = "cgi-bin/bmrcalc.php?"; // The server-side script

var working = false;



function handleHttpResponse() {

  if (http.readyState == 4) {

    working = false;

    if (http.responseText.indexOf('invalid') == -1) {

      results = http.responseText.split(",");

      document.bmr_form.bmr.value    = setComma(parseFloat(results[0]));

      document.bmr_form.bmr_af.value = setComma(parseFloat(results[1]));

      document.bmr_form.bmi.value = results[2];

      working = false;

    }

  }

}





function calculate(url) {

  if (!working) {

    http.open("GET", url, true);

    working = true;

    http.onreadystatechange = handleHttpResponse;

    http.send(null);

  }

}



//----------------------------- Variables -------------------------------------

var POUNDS      = 1;

var KILOGRAMS   = 2;

var INCHES      = 4;

var CENTIMETERS = 5;

var MALE        = 6;

var FEMALE      = 7;



var AF_SEDENTARY = 1.2;

var AF_LIGHT     = 1.375;

var AF_MODERATE  = 1.55;

var AF_VERY      = 1.725;

var AF_EXTRA     = 1.9;



var length_bmr  = INCHES;

var weight_bmr  = POUNDS;

var sex_bmr     = MALE;

var af          = AF_SEDENTARY;



var my_bmr      = 0;



//-----------------------------------------------------------------------------

// Unitsbmr 

//-----------------------------------------------------------------------------

function UnitsBMR()

{

  if (document.bmr_form.units_bmr[0].checked)       

  {

    weight_bmr = POUNDS;

    document.bmr_form.weight.value   =

      roundFloat(document.bmr_form.weight.value   * 2.2, 2);

  }

  else if (document.bmr_form.units_bmr[1].checked)  

  {

    weight_bmr = KILOGRAMS;

    document.bmr_form.weight.value   =

      roundFloat(document.bmr_form.weight.value   / 2.2, 2);

  }

}



//-----------------------------------------------------------------------------

// LengthBMR 

//-----------------------------------------------------------------------------

function LengthBMR()

{

  if (document.bmr_form.length_bmr[0].checked)       

  {

    length_bmr = INCHES;

    document.bmr_form.height.value = roundFloat(document.bmr_form.height.value

        / 2.54, 2);

  }                    

  else if (document.bmr_form.length_bmr[1].checked)  

  {

    length_bmr = CENTIMETERS;

    document.bmr_form.height.value = roundFloat(document.bmr_form.height.value

        * 2.54, 2);

  }

}



//-----------------------------------------------------------------------------

// Units_Sex

//-----------------------------------------------------------------------------

function Units_Sex()

{

  if (document.bmr_form.units_sex[0].checked)       

  {

    sex_bmr = MALE;

  }                    

  else if (document.bmr_form.units_sex[1].checked)  

  {

    sex_bmr = FEMALE;

  }

}



//-----------------------------------------------------------------------------

// RadioAF

//-----------------------------------------------------------------------------

function RadioAF()

{

  if (document.bmr_form.radio_af[0].checked)       

  {

    af = AF_SEDENTARY;

  }                    

  else if (document.bmr_form.radio_af[1].checked)  

  {

    af = AF_LIGHT;

  }

  else if (document.bmr_form.radio_af[2].checked)  

  {

    af = AF_MODERATE;

  }

  else if (document.bmr_form.radio_af[3].checked)  

  {

    af = AF_VERY;

  }

  else if (document.bmr_form.radio_af[4].checked)  

  {

    af = AF_EXTRA;

  }

}





//-----------------------------------------------------------------------------

// resetBMR - Clear out all fields for BMR

//-----------------------------------------------------------------------------

function resetBMR()

{

  document.bmr_form.height.value = 0;

  document.bmr_form.weight.value = 0;

  document.bmr_form.age.value    = 0;

}     



//-----------------------------------------------------------------------------

// checkFieldsBMR - Make sure all fields are populated before calculating BMR

//-----------------------------------------------------------------------------

function checkFieldsBMR()

{

  var errorField = false;



  if (!(IsNumber(document.bmr_form.height.value))) 

  {

    alert("You must enter a valid number for Height.\n");

    errorField = true;

  }



  if (!(IsNumber(document.bmr_form.weight.value))) 

  {

    alert("You must enter a valid number for Weight.\n");

    errorField = true;

  }



  if (!(IsNumber(document.bmr_form.age.value))) 

  {

    alert("You must enter a valid number for Age.\n");

    errorField = true;

  }



  if (errorField) 

    return false;



  return true;

}



//-----------------------------------------------------------------------------

// calculateBMR_BMI- Calculate BMR/BMI

//-----------------------------------------------------------------------------

function calculateBMR_BMI() 

{

  var weight = parseFloat(document.bmr_form.weight.value);

  var height = parseFloat(document.bmr_form.height.value);



  var bmr_height = height;

  var bmi_height = height;

  var bmr_weight = weight;

  var bmi_weight = weight;



  if (length_bmr == INCHES)

  {

    bmr_height *= 2.54;

  } else {

    bmi_height /= 2.54;

  }



  if (weight_bmr == POUNDS)

  {

    bmr_weight = weight / 2.20462;

  } else {

    bmi_weight = weight * 2.2;

  }



  url = script_url;

  if (sex_bmr == MALE) {

    url += "sex=m";

  } else {

    url += "sex=f";

  }

  url += "&age=" + escape(document.bmr_form.age.value);

  url += "&af=" + af;

  url += "&bmr_weight=" + bmr_weight;

  url += "&bmr_height=" + bmr_height;

  url += "&bmi_weight=" + bmi_weight;

  url += "&bmi_height=" + bmi_height;



  calculate(url);

}