Calculator Application with Source Code and live demo - Create a Calculator Application Using HTML5, Css, Js

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So this project is based on Calculator,

In this project, I will not use any kind of online Api.

I am sharing this projects source code for free.

So, to support me you can Subscribe to my YouTube channel.
Link is avaible any where in the page.

It is important to know before you start working on this project.

If you are bringing this project online, then you should give us a credit at footer, because it takes alot time make all these kinds of projects now if you ask that I want to bring it online but I will not give any credits to the developers & the provider then it is very wrong man.But still if you want to bring it online but you don't want to give us any credit.Then mail us at somrajf12@gmail.com

HTML

First, Create an HTML file with the name of index.html and paste the code given below, in your HTML file. Remember, you’ve to create a file with .html extension.

Note*: Click on the HTML Code then press ctrl + A to select the whole HTML Code, then ctrl + C to copy.

<!DOCTYPE html>

<head>

<title>HeartBeat</title>

</head>

<body>

</body>

</html>

Css

Second, Create a Css file with the name of style.css and paste the code given below, in your Css file. Remember, you’ve to create a file with .css extension.

Note*: Click on the Css Code then press ctrl + A to select the whole Css Code, then ctrl + C to copy.

body {
  width: 500px;
  margin: 4% auto;
  font-family: 'Source Sans Pro', sans-serif;
  letter-spacing: 5px;
  font-size: 1.8rem;
  -moz-user-select: none;
  -webkit-user-select: none;
  -ms-user-select: none;
}

.calculator {
  padding: 20px;
  -webkit-box-shadow: 0px 1px 4px 0px rgba(0, 0, 0, 0.2);
  box-shadow: 0px 1px 4px 0px rgba(0, 0, 0, 0.2);
  border-radius: 1px;
}

.input {
  border: 1px solid #ddd;
  border-radius: 1px;
  height: 60px;
  padding-right: 15px;
  padding-top: 10px;
  text-align: right;
  margin-right: 6px;
  font-size: 2.5rem;
  overflow-x: auto;
  transition: all .2s ease-in-out;
}

.input:hover {
  border: 1px solid #bbb;
  -webkit-box-shadow: inset 0px 1px 4px 0px rgba(0, 0, 0, 0.2);
  box-shadow: inset 0px 1px 4px 0px rgba(0, 0, 0, 0.2);
}

.buttons {}

.operators {}

.operators div {
  display: inline-block;
  border: 1px solid #bbb;
  border-radius: 1px;
  width: 80px;
  text-align: center;
  padding: 10px;
  margin: 20px 4px 10px 0;
  cursor: pointer;
  background-color: #ddd;
  transition: border-color .2s ease-in-out, background-color .2s, box-shadow .2s;
}

.operators div:hover {
  background-color: #ddd;
  -webkit-box-shadow: 0px 1px 4px 0px rgba(0, 0, 0, 0.2);
  box-shadow: 0px 1px 4px 0px rgba(0, 0, 0, 0.2);
  border-color: #aaa;
}

.operators div:active {
  font-weight: bold;
}

.leftPanel {
  display: inline-block;
}

.numbers div {
  display: inline-block;
  border: 1px solid #ddd;
  border-radius: 1px;
  width: 80px;
  text-align: center;
  padding: 10px;
  margin: 10px 4px 10px 0;
  cursor: pointer;
  background-color: #f9f9f9;
  transition: border-color .2s ease-in-out, background-color .2s, box-shadow .2s;
}

.numbers div:hover {
  background-color: #f1f1f1;
  -webkit-box-shadow: 0px 1px 4px 0px rgba(0, 0, 0, 0.2);
  box-shadow: 0px 1px 4px 0px rgba(0, 0, 0, 0.2);
  border-color: #bbb;
}

.numbers div:active {
  font-weight: bold;
}

div.equal {
  display: inline-block;
  border: 1px solid #3079ED;
  border-radius: 1px;
  width: 17%;
  text-align: center;
  padding: 127px 10px;
  margin: 10px 6px 10px 0;
  vertical-align: top;
  cursor: pointer;
  color: #FFF;
  background-color: #4d90fe;
  transition: all .2s ease-in-out;
}

div.equal:hover {
  background-color: #307CF9;
  -webkit-box-shadow: 0px 1px 4px 0px rgba(0, 0, 0, 0.2);
  box-shadow: 0px 1px 4px 0px rgba(0, 0, 0, 0.2);
  border-color: #1857BB;
}

div.equal:active {
  font-weight: bold;
}

JavaScript

Third, Create an Script file with the name of script.js and paste the code given below, in your JavaScript file. Remember, you’ve to create a file with .js extension.

Note*: Click on the JS Code then press ctrl + A to select the whole HTML Code, then ctrl + C to copy.

"use strict";

var input = document.getElementById('input'), // input/output button
  number = document.querySelectorAll('.numbers div'), // number buttons
  operator = document.querySelectorAll('.operators div'), // operator buttons
  result = document.getElementById('result'), // equal button
  clear = document.getElementById('clear'), // clear button
  resultDisplayed = false; // flag to keep an eye on what output is displayed

// adding click handlers to number buttons
for (var i = 0; i < number.length; i++) {
  number[i].addEventListener("click", function(e) {

// storing current input string and its last character in variables - used later
    var currentString = input.innerHTML;
    var lastChar = currentString[currentString.length - 1];

// if result is not diplayed, just keep adding
    if (resultDisplayed === false) {
      input.innerHTML += e.target.innerHTML;
    } else if (resultDisplayed === true && lastChar === "+" || lastChar === "-" || lastChar === "×" || lastChar === "÷") {
      // if result is currently displayed and user pressed an operator
      // we need to keep on adding to the string for next operation
      resultDisplayed = false;
      input.innerHTML += e.target.innerHTML;
    } else {
      // if result is currently displayed and user pressed a number
      // we need clear the input string and add the new input to start the new opration
      resultDisplayed = false;
      input.innerHTML = "";
      input.innerHTML += e.target.innerHTML;
    }

});
}

// adding click handlers to number buttons
for (var i = 0; i < operator.length; i++) {
  operator[i].addEventListener("click", function(e) {

// storing current input string and its last character in variables - used later
    var currentString = input.innerHTML;
    var lastChar = currentString[currentString.length - 1];

// if last character entered is an operator, replace it with the currently pressed one
    if (lastChar === "+" || lastChar === "-" || lastChar === "×" || lastChar === "÷") {
      var newString = currentString.substring(0, currentString.length - 1) + e.target.innerHTML;
      input.innerHTML = newString;
    } else if (currentString.length == 0) {
      // if first key pressed is an opearator, don't do anything
      console.log("enter a number first");
    } else {
      // else just add the operator pressed to the input
      input.innerHTML += e.target.innerHTML;
    }

});
}

// on click of 'equal' button
result.addEventListener("click", function() {

// this is the string that we will be processing eg. -10+26+33-56*34/23
  var inputString = input.innerHTML;

// forming an array of numbers. eg for above string it will be: numbers = ["10", "26", "33", "56", "34", "23"]
  var numbers = inputString.split(/\+|\-|\×|\÷/g);

// forming an array of operators. for above string it will be: operators = ["+", "+", "-", "*", "/"]
  // first we replace all the numbers and dot with empty string and then split
  var operators = inputString.replace(/[0-9]|\./g, "").split("");

console.log(inputString);
  console.log(operators);
  console.log(numbers);
  console.log("----------------------------");

// now we are looping through the array and doing one operation at a time.
  // first divide, then multiply, then subtraction and then addition
  // as we move we are alterning the original numbers and operators array
  // the final element remaining in the array will be the output

var divide = operators.indexOf("÷");
  while (divide != -1) {
    numbers.splice(divide, 2, numbers[divide] / numbers[divide + 1]);
    operators.splice(divide, 1);
    divide = operators.indexOf("÷");
  }

var multiply = operators.indexOf("×");
  while (multiply != -1) {
    numbers.splice(multiply, 2, numbers[multiply] * numbers[multiply + 1]);
    operators.splice(multiply, 1);
    multiply = operators.indexOf("×");
  }

var subtract = operators.indexOf("-");
  while (subtract != -1) {
    numbers.splice(subtract, 2, numbers[subtract] - numbers[subtract + 1]);
    operators.splice(subtract, 1);
    subtract = operators.indexOf("-");
  }

var add = operators.indexOf("+");
  while (add != -1) {
    // using parseFloat is necessary, otherwise it will result in string concatenation :)
    numbers.splice(add, 2, parseFloat(numbers[add]) + parseFloat(numbers[add + 1]));
    operators.splice(add, 1);
    add = operators.indexOf("+");
  }

input.innerHTML = numbers[0]; // displaying the output

resultDisplayed = true; // turning flag if result is displayed
});

// clearing the input on press of clear
clear.addEventListener("click", function() {
  input.innerHTML = "";
})

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Frequently Asked Questions

Q 1: Can I use this Source Code without giving credits ?

Ans: Yes, you can use but if your bring this projects, then should give us a credit at footer, because it takes alot time make all thess kinds of projects now if you ask that I want to bring it online but I will not give any credits to the developers & the provider then it is very wrong.

Q 2: Actually I want to bring this project online but I don't want to give credits ?

Ans: Ok, we have problem but also you cannot claim that it is made by you.
It is not all about flex you should increase you knowledge.

Q 3: If I am bringing this project online and not giving credits & claiming it is developed by me then ?

Ans: Ok, 1-3 times you will be warned and your that site will be suspended.
Still if you continue, then it can become to a legal things.