Js kalku
function getHistory(){
return document.getElementById("history-value").innerText;
}
function printHistory(num){
document.getElementById("history-value").innerText=num;
}
function getOutput(){
return document.getElementById("output-values").innerText;
}
function printOutput(num){
if(num==""){
document.getElementById("output-values").innerText=num;
}
else{
document.getElementById("output-values").innerText=getFormattedNumber(num);
}
}
function getFormattedNumber(num){
if(num=="-"){
return "";
}
var n=Number(num);
var value= n.toLocaleString("en");
return value;
}
function reverseNumberFormat(num){
return Number(num.replace(/,/g, ''));
}
var operator = document.getElementsByClassName("operator");
for( var i=0;i<operator.length;i++){
operator[i].addEventListener('click',function(){
if(this.id=="clear"){
printHistory("");
printOutput("");
}
else if(this.id=="backspace"){
var
output=reverseNumberFormat(getOutput()).toString();
if(output){//if output has a value
output= output.substr(0,output.length-1);
printOutput(output);
}
}
else{
var output = getOutput();
var history = getHistory();
if(output==""&&history!=""){
if(isNaN(history[history.length-1])){
history=history.substr(0,history.length-1);
}
}
if(output!="" || history!=""){
output= output==""?
output:reverseNumberFormat(output);
history=history+output;
if(this.id=="="){
var result= eval(history);
printOutput(result);
printHistory("");
}
else{
history=history+this.id;
printHistory(history);
printOutput("");
}
}
}
});
}
var number = document.getElementsByClassName("number");
for(var i=0;i<number.length;i++){
number[i].addEventListener('click',function(){
var output=reverseNumberFormat(getOutput());
if(output!=NaN){
output=output+this.id;
printOutput(output);
}
});
}
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