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script.js
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script.js
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// Initialize an empty string to store the user input
let inputString = '';
// Select the input field
const inputField = document.querySelector('input');
const resultDisplay = document.querySelector('#results');
const operators = ['+','-','*','/'];
// Select all the calculator buttons on the page
const calculatorButtons = document.querySelectorAll('button');
// Select the body element
const bodyElement = document.body;
const parentBox = document.querySelector('.parent');
function generateRandomGradient() {
// Generate random colors
const color1 = getRandomColor();
const color2 = getRandomColor();
// Generate a random angle between 0 and 360 degrees
const angle = Math.floor(Math.random() * 360);
// Create the linear gradient string
const gradient = `linear-gradient(${angle}deg, ${color1}, ${color2})`;
// return the generated linear gradient
return gradient;
}
function getRandomColor() {
// Generate a random hexadecimal color code
const letters = '0123456789ABCDEF';
let color = '#';
for (let i = 0; i < 6; i++) {
color += letters[Math.floor(Math.random() * 16)];
}
color += '80'; // so that the background is not a solid color
return color;
}
// Function to change the background color
function changeBackgroundColor() {
bodyElement.style.background = generateRandomGradient();
parentBox.classList.add('box-highlight');
// Add a button press effect to the parent container
setTimeout(() => {
parentBox.classList.remove('box-highlight');
}, 200);
}
function animateValueChange(element, end, duration) {
let startValue = parseFloat(element.value) || 0; // Start from the current value
let startOpacity = 0; // Start from opacity 0
let startTimestamp = null;
const step = (timestamp) => {
if (!startTimestamp) startTimestamp = timestamp;
const progress = Math.min((timestamp - startTimestamp) / duration, 1);
const interpolatedOpacity = progress;
// Update the value and opacity (don't change anything other than alpha though, get the elements r, g, and b)
element.value = end;
// Get R G and B of the text
const rgb = window.getComputedStyle(element).color.match(/\d+/g);
const r = rgb[0];
const g = rgb[1];
const b = rgb[2];
element.style.color = `rgba(${r}, ${g}, ${b}, ${interpolatedOpacity})`;
if (progress < 1) {
window.requestAnimationFrame(step);
}
};
window.requestAnimationFrame(step);
}
// Function to calculate and display the result
function calculateResult() {
const inputValue = inputField.value;
try {
// Replace percentage symbol (%) with '/100' before evaluation
inputString = inputValue.replace(/%/g, '/100');
// Replace √(first digit group) with 'Math.sqrt()' function for that digit group before evaluation
inputString = inputValue.replace(/√([+-]*\d+)/g, 'Math.sqrt($1)');
// Evaluate the user input as a mathematical expression using eval
const result = eval(inputString);
// Display the result in the second input field
animateValueChange(resultDisplay, result, 500);
// Revert back the Math.sqrt() function
inputString = inputValue.replace(/Math.sqrt\((\d+)\)/g, '√$1');
// Change the background color here
changeBackgroundColor();
} catch (error) {
// Handle invalid expressions
navigator.vibrate(200);
inputField.value = '';
inputString = '';
resultDisplay.value = error.message; // Clear the dashboard on error
}
}
// Function to continuously update the result as the user types or presses buttons
function updateResult() {
inputString = inputField.value;
try {
// Check if the inputString is not empty and contains a valid expression
if (inputString) {
const result = eval(inputString);
animateValueChange(resultDisplay, result, 500);
} else {
resultDisplay.value = ''; // Clear the dashboard if the input is empty
}
} catch (error) {
resultDisplay.value = ''; // Clear the dashboard on error
}
}
// Add an event listener to each button
calculatorButtons.forEach((button) => {
button.addEventListener('click', () => {
const buttonValue = button.textContent;
switch (buttonValue) {
case '=':
// Check if the inputString is not empty and contains a valid expression
if (inputString) {
calculateResult();
}
break;
case 'C':
// Clear the inputString and reset the input field
inputString = '';
inputField.value = inputString;
// claer the Display field
resultDisplay.value = '';
break;
case 'M+':
// Add the current input value to the memory value
memoryValue += parseFloat(inputField.value) || 0;
inputString = '';
break;
case 'M-':
// Subtract the current input value from the memory value
memoryValue -= parseFloat(inputField.value) || 0;
inputString = '';
break;
case 'sin':
inputField.value = Math.sin(parseFloat(inputField.value));
inputString = inputField.value.toString();
break;
case 'cos':
inputField.value = Math.cos(parseFloat(inputField.value));
inputString = inputField.value.toString();
break;
case 'tan':
inputField.value = Math.tan(parseFloat(inputField.value));
inputString = inputField.value.toString();
break;
case '^':
const num = parseFloat(inputField.value);
const result = num * num;
//inputString = result.toString();
break;
case '√':
// inputField.value = Math.sqrt(parseFloat(inputField.value));
// Check if input field value is empty and if it is, not then √ should precede *
const inputFieldValueLength = inputField.value.length;
if(inputFieldValueLength != 0 && !operators.includes(inputField.value[inputFieldValueLength - 1]))
inputField.value += '*';
inputField.value += '√';
inputString = inputField.value.toString();
break;
case 'log':
inputField.value = Math.log(parseFloat(inputField.value));
inputString = inputField.value.toString();
break;
case 'π':
inputField.value += Math.PI.toFixed(3);
inputString = inputField.value.toString();
updateResult();
break;
case 'e':
inputField.value = Math.E;
inputString = inputField.value.toString();
break;
case 'X!':
const numX = parseFloat(inputField.value);
let factorial = 1;
for (let i = 1; i <= numX; i++) {
factorial *= i;
}
inputString = factorial.toString();
break;
case 'CE':
inputField.value = inputField.value.slice(0, -1);
inputString = inputField.value;
break;
default:
// Append the clicked button's value to the input field
inputString += buttonValue;
inputField.value = inputString;
updateResult(); // Update the result as you add operators
break;
}
});
});
inputField.addEventListener('input', updateResult);
// Set the date we're counting down to
var countDownDate = new Date("Oct 31, 2023 23:59:59").getTime();
// Update the count down every 1 second
var x = setInterval(function() {
// Get today's date and time
var now = new Date().getTime();
// Find the distance between now and the count down date
var distance = countDownDate - now;
// Time calculations for days, hours, minutes and seconds
var days = Math.floor(distance / (1000 * 60 * 60 * 24));
var hours = Math.floor((distance % (1000 * 60 * 60 * 24)) / (1000 * 60 * 60));
var minutes = Math.floor((distance % (1000 * 60 * 60)) / (1000 * 60));
var seconds = Math.floor((distance % (1000 * 60)) / 1000);
// Display the result in the element with id="demo"
document.getElementById("timer-text").innerHTML = "Ends in " + days + "d " + hours + "h "
+ minutes + "m " + (seconds < 10 ? "0" : "") + seconds + "s ";
// If the count down is finished, write some text
if (distance < 0) {
clearInterval(x);
document.getElementById("timer-text").innerHTML = "ENDED";
}
}, 1000);