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abv-calc.js
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abv-calc.js
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/*
* abv-calc.js - the actual logic begind ABVCalc.
*
* This has been considerably re-factored to remove our dependency on jQuery
* and generally streamline things.
*
* This file, along with the rest of the ABV Calculator, is licensed under
* the MIT License - see the accompanying LICENSE file for more details.
*
* Copyright (C) 2014, 2023 Pete Favelle, pete@petedrinks.com
*/
// Wrap everything in a protective namespace, to hopefully avoid clashing
// with any other code being included.
var PeteDrinksABVCalc = PeteDrinksABVCalc || {
// Need to remember the current reader and unit options, so that we can
// spot when it changes.
mCurrentReader: 0,
mCurrentUnits: 0,
// Init function; will identify the target div and attach appropriate
// handlers to the fields.
init: function() {
// Initialise the current options
PeteDrinksABVCalc.mCurrentReader = document.querySelector( "input[name = 'pdac-reader']:checked" ).value;
PeteDrinksABVCalc.mCurrentUnits = document.querySelector( "input[name = 'pdac-units']:checked" ).value;
// Attach change handlers to inputs
document.getElementById( "pdac-measured-og" ).addEventListener( "change", function(){ PeteDrinksABVCalc.GravityChange(this) } );
document.getElementById( "pdac-measured-fg" ).addEventListener( "change", function(){ PeteDrinksABVCalc.GravityChange(this) } );
document.getElementById( "pdac-wcf" ).addEventListener( "change", function(){ PeteDrinksABVCalc.WCFChange(this) } );
let lUnitRadio = document.getElementsByName( "pdac-units" );
for ( let i = 0; i < lUnitRadio.length; i++ )
{
lUnitRadio[i].addEventListener( "click", function(){ PeteDrinksABVCalc.UnitChange(this) } );
}
let lReaderRadio = document.getElementsByName( "pdac-reader" );
for ( let i = 0; i < lReaderRadio.length; i++ )
{
lReaderRadio[i].addEventListener( "click", function(){ PeteDrinksABVCalc.ReaderChange(this) } );
}
},
// Main calculation routine; called whenever things change
//
CalcABV: function() {
// First off, we try to work out the 'calculated' OG/FG - which depends
// on the device being used.
const lCalcOG = document.getElementById( "pdac-calculated-og" );
const lCalcFG = document.getElementById( "pdac-calculated-fg" );
const lABV = document.getElementById( "pdac-calculated-abv" );
// We'll potentially need Brix, if we need to apply refractometer fixes
let lBrixOG = 0;
let lBrixFG = 0;
// When units are SG, it's (probably) a straight copy
let lUnits = document.querySelector( "input[name = 'pdac-units']:checked" ).value;
if ( lUnits == "SG" )
{
lBrixOG = PeteDrinksABVCalc.ConvertSGToBrix( document.getElementById( "pdac-measured-og" ), false );
lBrixFG = PeteDrinksABVCalc.ConvertSGToBrix( document.getElementById( "pdac-measured-fg" ), false );
lCalcOG.value = Number.parseFloat( document.getElementById( "pdac-measured-og" ).value ).toFixed( 3 );
lCalcFG.value = Number.parseFloat( document.getElementById( "pdac-measured-fg" ).value ).toFixed( 3 );
}
else
{
lBrixOG = Number.parseFloat( document.getElementById( "pdac-measured-og" ).value );
lBrixFG = Number.parseFloat( document.getElementById( "pdac-measured-fg" ).value );
// The gravities are the same, but in SG
lCalcOG.value = PeteDrinksABVCalc.ConvertBrixToSG( document.getElementById( "pdac-measured-og" ), false ).toFixed( 3 );
lCalcFG.value = PeteDrinksABVCalc.ConvertBrixToSG( document.getElementById( "pdac-measured-fg" ), false ).toFixed( 3 );
}
// Now if we're using a refractometer there's more processing
let lReader = document.querySelector( "input[name = 'pdac-reader']:checked" ).value;
if ( lReader == "R" )
{
// Any wort correction needs to be applied to both OG and FG
let lWCF = Number.parseFloat( document.getElementById( "pdac-wcf" ).value );
lBrixOG = lBrixOG / lWCF;
lBrixFG = lBrixFG / lWCF;
// We'll need to update the calculated figures, then
lCalcOG.value = lBrixOG;
lCalcOG.value = PeteDrinksABVCalc.ConvertBrixToSG( lCalcOG, false ).toFixed( 3 );
lCalcFG.value = lBrixFG;
lCalcFG.value = PeteDrinksABVCalc.ConvertBrixToSG( lCalcFG, false ).toFixed( 3 );
// And the final gravity needs correcting
lCalcFG.value = ( 1.0000 - 0.0044993*lBrixOG + 0.011774*lBrixFG +
0.00027581*lBrixOG*lBrixOG - 0.0012717*lBrixFG*lBrixFG -
0.0000072800*lBrixOG*lBrixOG*lBrixOG + 0.000063293*lBrixFG*lBrixFG*lBrixFG ).toFixed( 3 );
}
// Default to a blank ABV
lABV.value = "--.--%";
// Now, if we have good values, we can work out our ABV
if ( lCalcOG.value >= 1 && lCalcOG.value <= 1.125 &&
lCalcFG.value >= 1 && lCalcFG.value <= 1.125 )
{
lABV.value = ( ( 76.08 * ( lCalcOG.value - lCalcFG.value ) / ( 1.775 - lCalcOG.value ) ) *
( lCalcFG.value / 0.794 ) ).toFixed( 2 ) + "%";
}
},
// Process the reader in use changing between Hydrometer and Refractometer
//
ReaderChange: function( pControl ) {
// Clear any outstanding error messages
PeteDrinksABVCalc.ClearError();
// We only need to do work if the units have actually changed
if ( pControl.value != PeteDrinksABVCalc.mCurrentReader )
{
// Refractometers (might) need Wort Correction Factors
if ( pControl.value == "R" )
{
document.getElementById( "pdac-wcf-row" ).style.display = "block";
}
else
{
document.getElementById( "pdac-wcf-row" ).style.display = "none";
}
// And remember this new value.
PeteDrinksABVCalc.mCurrentReader = pControl.value;
}
// Re-call the calculation routine; nothing *should* change, but...
PeteDrinksABVCalc.CalcABV();
},
// Processes the units of measure being changed between SG and Brix
//
UnitChange: function( pControl ) {
// Clear any outstanding error messages
PeteDrinksABVCalc.ClearError();
// We only need to do work if the units have actually changed
if ( pControl.value != PeteDrinksABVCalc.mCurrentUnits )
{
// Convert any input values automagically
if ( pControl.value == "Brix" )
{
PeteDrinksABVCalc.ConvertSGToBrix( document.getElementById( "pdac-measured-og" ), true );
PeteDrinksABVCalc.ConvertSGToBrix( document.getElementById( "pdac-measured-fg" ), true );
}
else
{
PeteDrinksABVCalc.ConvertBrixToSG( document.getElementById( "pdac-measured-og" ), true );
PeteDrinksABVCalc.ConvertBrixToSG( document.getElementById( "pdac-measured-fg" ), true );
}
// And then normalize it
PeteDrinksABVCalc.Normalize( document.getElementById( "pdac-measured-og" ) );
PeteDrinksABVCalc.Normalize( document.getElementById( "pdac-measured-fg" ) );
// And remember this new value.
PeteDrinksABVCalc.mCurrentUnits = pControl.value;
}
// Re-call the calculation routine; nothing *should* change, but...
PeteDrinksABVCalc.CalcABV();
},
// Conversion routines; to switch between SG and Brix
//
ConvertSGToBrix: function( pControl, pSet ) {
let lConvertedValue = 0;
// Sanity check; only convert if it looks like a valid SG
if ( pControl.value >= 1 && pControl.value <= 1.125 )
{
// Calculate the new value
lConvertedValue = ( 135.997 * pControl.value * pControl.value * pControl.value ) -
( 630.272 * pControl.value * pControl.value ) +
( 1111.14 * pControl.value ) -
616.868;
// Cap it to zero
if ( lConvertedValue < 0 )
{
lConvertedValue = 0;
}
}
// If requested, set the control value to this
if ( pSet )
{
pControl.value = lConvertedValue;
}
return lConvertedValue;
},
ConvertBrixToSG: function( pControl, pSet ) {
let lConvertedValue = 0;
// Sanity check; only convert if it looks like a valid Brix
if ( pControl.value >= 0 && pControl.value <= 30 )
{
// Calculate the new value
lConvertedValue = 1.0 + ( pControl.value / ( 258.6 - ( ( pControl.value / 258.2 ) * 227.1 ) ) );
}
// If requested, set the control value to this
if ( pSet )
{
pControl.value = lConvertedValue;
}
return lConvertedValue;
},
// Handle changes in the Original/Final Gravity fields
//
GravityChange: function( pControl ) {
// Clear any outstanding error messages
PeteDrinksABVCalc.ClearError();
// First step, normalize the entered value taking into account the units
// we're working in.
PeteDrinksABVCalc.Normalize( pControl );
// And then call the main calculation routine to do the maths!
PeteDrinksABVCalc.CalcABV();
},
// And handle the Wort Correction Factor changing, too
//
WCFChange: function( pControl ) {
// Clear any outstanding error messages
PeteDrinksABVCalc.ClearError();
// Clamp the entered value to something moderately sensible
if ( pControl.value < 0.75 )
{
PeteDrinksABVCalc.Error( "WCF cannot be below 0.75", pControl.id + "-error" );
pControl.value = 0.75;
}
if ( pControl.value > 1.25 )
{
PeteDrinksABVCalc.Error( "WCF cannot be above 1.25", pControl.id + "-error" );
pControl.value = 1.25;
}
// Lastly, ensure it's to the right precision
pControl.value = Number.parseFloat( pControl.value ).toFixed( 2 );
// And then call the main calculation routine to do the maths!
PeteDrinksABVCalc.CalcABV();
},
// Normalise a Gravity field, taking into account what units we use
//
Normalize: function( pControl ) {
// So, what mode are we in - Specific Gravity, or Brix?
let lUnits = document.querySelector( "input[name = 'pdac-units']:checked" ).value;
// The ranges vary, obviously.
if ( lUnits == "SG" )
{
// If the user has keyed a four digit value, assume the decimal
if ( pControl.value > 999 && pControl.value < 1125 )
{
pControl.value = pControl.value / 1000;
}
// Needs to be between 1 and 1.25 (any higher and things get messy)
if ( pControl.value < 1 )
{
PeteDrinksABVCalc.Error( "Input gravity cannot be below 1", pControl.id + "-error" );
pControl.value = 1;
}
if ( pControl.value > 1.125 )
{
PeteDrinksABVCalc.Error( "Input gravity cannot exceed 1.125", pControl.id + "-error" );
pControl.value = 1.125;
}
// Lastly, ensure it's to the right precision
pControl.value = Number.parseFloat( pControl.value ).toFixed( 3 );
}
else
{
// Brix are a little easier, need to be between 0 and 30
if ( pControl.value < 0 )
{
PeteDrinksABVCalc.Error( "Input brix cannot be below 0", pControl.id + "-error" );
pControl.value = 0;
}
if ( pControl.value > 30 )
{
PeteDrinksABVCalc.Error( "Input brix cannot exceed 30.0", pControl.id + "-error" );
pControl.value = 30;
}
// Lastly, ensure it's to the right precision
pControl.value = Number.parseFloat( pControl.value ).toFixed( 1 );
}
},
// Show an error message; if no location provided, use the default
//
Error: function( pErrorText, pErrorDiv = "pdac-err" ) {
// Find the location to put the error.
let lErrorDiv = document.getElementById( pErrorDiv );
// If the error box is a row, wrap it in an internal div
if ( lErrorDiv.classList.contains( "row" ) )
{
lErrorDiv.innerHTML = "<div>" + pErrorText + "</div>";
}
else
{
lErrorDiv.innerHTML = pErrorText;
}
// And make it visible
lErrorDiv.style.display = "block";
},
// Clear all error messages; identified by the 'pdac-err' class
ClearError: function() {
let lErrorDivs = document.getElementsByClassName( "pdac-err" );
for ( let i = 0; i < lErrorDivs.length; i++ )
{
lErrorDivs[i].style.display = "none";
}
}
}
// A jQuery-free ready function
if ( document.attachEvent ? document.readyState === 'complete'
: document.readyState !== 'loading' )
{
PeteDrinksABVCalc.init();
}
else
{
document.addEventListener( 'DOMContentLoaded', PeteDrinksABVCalc.init );
}