How to create Calculator | HTML, CSS, and JavaScript Project - Frontend everything
Hello Everyone 👋 Welcome to My New Blog. Today I have made an Amazing Calculator with the help of HTML, CSS, and JavaScript Only! 😍
I am Piyush, Sharing About Web development Daily. You can also check out me at @frontendeverything.
Before starting the blog, you might think about where you can use this project in real-life-based projects. So it's an Amazing Calculator that you can use in your own blog project. So it will look attractive.
Let's start making these amazing Text Scroll Effect Using HTML, CSS, and JavaScript.
Video of the project,
So that was the preview now let us start making the project 😄 First, we will code HTML then CSS, and also I have shared codepen ink to make it easier for you.
HTML 🎈( step - 1)
In HTML we have used header and div tags for the containers.
<div class="calculator">
<div class="input" id="input"></div>
<div class="buttons">
<div class="operators">
<div>+</div>
<div>-</div>
<div>×</div>
<div>÷</div>
</div>
<div class="leftPanel">
<div class="numbers">
<div>7</div>
<div>8</div>
<div>9</div>
</div>
<div class="numbers">
<div>4</div>
<div>5</div>
<div>6</div>
</div>
<div class="numbers">
<div>1</div>
<div>2</div>
<div>3</div>
</div>
<div class="numbers">
<div>0</div>
<div>.</div>
<div id="clear">C</div>
</div>
</div>
<div class="equal" id="result">=</div>
</div>
</div>
After the HTML we will write CSS code!
Output till now
CSS🎈( step - 2)
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;
}
Now we have done the CSS coding as well, now we will do Javascript Coding and then see the final output.
JavaScript🎈( step - 3)
"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 = "";
})
Now we have done the JavaScript Coding, now let's see the final output. Also I have shared the codepen link after the output so check that also.
Final Output
The codepen link is here for making your work easier!
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Thank You For Scrolling Till here 😊. If You gain any knowledge then do checkout me at @frontendeverything. I am Piyush 🎉 I provide Content related to programming, technology, web development Daily.
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codepen.io link this calcukator code not same another link attatch
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