1. Copy the coding into the HEAD of your HTML document
2. Add the last code into the BODY of your HTML document -->
<!-- STEP ONE: Paste this code into the HEAD of your HTML document -->
<HEAD>
<script type="text/javascript">
<!--
/* This script and many more are available free online at
The JavaScript Source!! http://javascript.internet.com
Created by: Matthew Roy :: http://matthewroy.com */
/*****************************************
** Matthew C. Roy
** Big Business Websites
** For Small Business Prices!
** http://www.matthewroy.com
**
** You may use this script freely for
** non-commercial use as long
** as this header is left intact.
*****************************************/
var n1, n2, d1, d2, An, Ad, Op;
var neg=1;
function solve(){
//If all fields are numbers
if(!isNaN(document.calc.n1.value)&&!isNaN(document.calc.d1.value)&&!isNaN(document.calc.n2.value)&&!isNaN(document.calc.d2.value)){
//If no fields are blank
if(document.calc.n1.value!=''&&document.calc.d1.value!=''&&document.calc.n2.value!=''&&document.calc.d2.value!=''){
//Set variables:
n1=document.calc.n1.value;// Numerator 1
d1=document.calc.d1.value;// Numerator 2
n2=document.calc.n2.value;// Denominator 1
d2=document.calc.d2.value;// Denominator 2
Op=document.calc.Op.value;// Operator
} else {
//If blank field
alert('Please fill-in all fields!');
}
} else {
//If field has non-number
alert('Please enter only Numbers into the fields!');
}
//Which Operation
switch (Op){
case '+':
//add fractions using formula ((n1*d2)+(n2*d1)) over (d1*d2)
An=(n1*d2)+(n2*d1) //Answer Numerator
Ad=(d1*d2) //Answer Denominator
if(document.calc.reduce.checked==1){
reduce();
} else {
display();
}
break
case '-':
//subtract fractions using formula ((n1*d2)-(n2*d1)) over (d1*d2)
An=(n1*d2)-(n2*d1)//Answer Numerator
Ad=(d1*d2)//Answer Denominator
if(document.calc.reduce.checked==1){
reduce();
} else {
display();
}
break
case '*':
//multiply fractions using formula (n1*n2) over (d1*d2)
An=n1*n2;//Answer Numerator
Ad=d1*d2; //Answer Denominator
if(document.calc.reduce.checked==1){
reduce();
} else {
display();
}
break
case '/':
//divide fractions using formula (n1*d2) over (d1*n2)
An=n1*d2;//Answer Numerator
Ad=d1*n2;//Answer Denominator
if(document.calc.reduce.checked==1){
reduce();
} else {
display();
}
break
}
}
function reduce() {
neg=1; //1 if positive, -1 if negative
//convert to strings
ng=An+'';
dg=Ad+''
if(ng.indexOf('-')!=-1){ //check to see if answer is negative.
neg=-1
}
if(dg.indexOf('-')!=-1){
neg=-1
}
if(ng.indexOf('-')!=-1&&dg.indexOf('-')!=-1) {//if both numerator and
denominator are negative the answer is positive
neg=1
}
var factorX //highest common factor
if ( An == 0 || Ad == 0 ) {
factorX=1;
return;
}
An = Math.abs( An );
Ad = Math.abs( Ad );
var factorX = 1;
//Find common factors of Numerator and Denominator
for ( var x = 2; x <= Math.min( An, Ad ); x ++ ) {
var check1 = An / x;
if ( check1 == Math.round( check1 ) ) {
var check2 = Ad / x;
if ( check2 == Math.round( check2 ) ) {
factorX = x;
}
}
}
An=(An/factorX)*neg; //divide by highest common factor to reduce fraction then
multiply by neg to make positive or negative
Ad=Ad/factorX; //divide by highest common factor to reduce fraction
display();
}
.