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Лаб. 1 6413 Мантров Илья #112

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c0526f7
calculator is implemented
pafosz Feb 28, 2026
eede3b4
merge branch
pafosz Feb 28, 2026
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36 changes: 36 additions & 0 deletions index.html
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<!DOCTYPE html>
<html lang="ru">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Калькулятор</title>
<link rel="stylesheet" href="resources/style.css">
</head>
<body>
<div class="calculator-container">
<div class="calculator">
<div class="input-row">
<input type="text" id="operand1" class="calc-input" placeholder="Первый операнд">

<select id="operator" class="calc-select">
<option value="+">+</option>
<option value="-">-</option>
<option value="*">*</option>
<option value="/">/</option>
</select>

<input type="text" id="operand2" class="calc-input" placeholder="Второй операнд">
</div>

<div class="button-row">
<button id="calculate-btn" class="calc-button">подсчитать</button>
</div>

<div id="result-field" class="result-field">
</div>
</div>
</div>

<script src="resources/script.js"></script>
</body>
</html>
171 changes: 171 additions & 0 deletions resources/script.js
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document.addEventListener('DOMContentLoaded', function() {

const operand1Input = document.getElementById('operand1');
const operand2Input = document.getElementById('operand2');
const operatorSelect = document.getElementById('operator');
const calculateBtn = document.getElementById('calculate-btn');
const resultField = document.getElementById('result-field');

let history = [];

// Функция для замены запятой на точку
function normalizeNumber(value) {
return value.replace(',', '.');
}

function isValidNumber(value) {
if (value === '' || value === null || value === undefined) {
return false;
}
const normalizedValue = normalizeNumber(value);
return !isNaN(parseFloat(normalizedValue)) && isFinite(normalizedValue);
}

// Функция для удаления класса ошибки у полей
function removeErrors() {
operand1Input.classList.remove('error-input');
operand2Input.classList.remove('error-input');

// Удаляем существующие сообщения об ошибках
const existingErrors = document.querySelectorAll('.error-message');
existingErrors.forEach(error => error.remove());
}

function showError(message) {
const errorDiv = document.createElement('div');
errorDiv.className = 'error-message';
errorDiv.textContent = message;
resultField.parentNode.insertBefore(errorDiv, resultField.nextSibling);
}

function calculate() {
removeErrors();

const val1 = operand1Input.value.trim();
const val2 = operand2Input.value.trim();
const operator = operatorSelect.value;

let hasError = false;

if (!isValidNumber(val1)) {
operand1Input.classList.add('error-input');
hasError = true;
}

if (!isValidNumber(val2)) {
operand2Input.classList.add('error-input');
hasError = true;
}

if (hasError) {
showError('Пожалуйста, введите корректные числа (используйте цифры, точку или запятую)');
return;
}

const num1 = parseFloat(normalizeNumber(val1));
const num2 = parseFloat(normalizeNumber(val2));

if (operator === '/' && num2 === 0) {
operand2Input.classList.add('error-input');
showError('Деление на ноль невозможно');
return;
}

let result;
switch (operator) {
case '+':
result = num1 + num2;
break;
case '-':
result = num1 - num2;
break;
case '*':
result = num1 * num2;
break;
case '/':
result = num1 / num2;
break;
default:
result = 'Ошибка';
}

// Форматируем результат (ограничиваем до 10 знаков после запятой)
if (typeof result === 'number') {
result = parseFloat(result.toFixed(10));
}

const exampleString = `${val1} ${operator} ${val2} = ${result}`;

history.push(exampleString);

// Оставляем только последние 2 примера
if (history.length > 2) {
history.shift();
}

displayResults();
}

function displayResults() {
resultField.innerHTML = '';

if (history.length === 0) {
return;
}

// Отображаем предыдущий результат (если есть)
if (history.length === 2) {
const prevDiv = document.createElement('div');
prevDiv.className = 'previous-result';
prevDiv.textContent = history[0];
resultField.appendChild(prevDiv);
}

// Отображаем текущий результат
const currentDiv = document.createElement('div');
currentDiv.className = 'current-result';
currentDiv.textContent = history[history.length - 1];
resultField.appendChild(currentDiv);
}

// Функция для валидации ввода в реальном времени
function validateInput(input) {
input.addEventListener('input', function() {
// Разрешаем цифры, точку, запятую и знак минус в начале
const value = this.value;
const lastChar = value[value.length - 1];

if (value.length > 0) {
// Проверяем, что последний символ допустим
if (!/^[\d\.,\-]$/.test(lastChar)) {
this.value = value.slice(0, -1);
}

// Проверяем, что минус может быть только в начале
if (lastChar === '-' && value.indexOf('-') !== value.lastIndexOf('-')) {
this.value = value.slice(0, -1);
}
}
});

// Убираем ошибку при начале ввода
input.addEventListener('focus', function() {
this.classList.remove('error-input');
const existingErrors = document.querySelectorAll('.error-message');
existingErrors.forEach(error => error.remove());
});
}

validateInput(operand1Input);
validateInput(operand2Input);

// Обработчик для кнопки подсчета
calculateBtn.addEventListener('click', calculate);

// Обработчик для клавиши Enter
document.addEventListener('keypress', function(e) {
if (e.key === 'Enter') {
calculate();
}
});
});
133 changes: 133 additions & 0 deletions resources/style.css
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* {
margin: 0;
padding: 0;
box-sizing: border-box;
}

body {
font-family: Arial, sans-serif;
min-height: 100vh;
display: flex;
background-color: #f0f0f0;
}

.calculator-container {
width: 70%;
margin: 20px;
}

.calculator {
background-color: #BAFFC2;
padding: 20px;
border-radius: 10px;
width: 100%;
}

.calc-input,
.calc-select,
.calc-button,
.result-field {
background-color: #BAFFC2;
border: 1px dashed #ff0000;
border-radius: 10px;
color: #ff0100;
font-size: 16px;
}

.calc-input {
flex: 1;
min-width: 150px;
padding: 10px 15px;
}

.calc-input::placeholder {
color: rgba(255, 1, 0, 0.5);
}

.calc-select {
width: 80px;
padding: 8px 5px;
text-align: left;
}

.calc-select option {
background-color: #BAFFC2;
color: #FF0100;
}

.calc-button {
padding: 5px 20px;
font-size: 16px;
cursor: pointer;
width: auto;
display: inline-block;
transition: background-color 0.3s;
}

.calc-button:hover {
background-color: rgba(255, 1, 0, 0.1);
}

.result-field {
padding: 15px;
min-height: 80px;
font-size: 18px;
display: flex;
flex-direction: column;
gap: 5px;
}

.current-result {
color: #ff0100;
}

.previous-result {
color: rgba(255, 1, 0, 0.3);
}

.error-input {
border-style: solid;
background-color: rgba(255, 1, 0, 0.05);
}

.error-message {
color: #ff0100;
font-size: 14px;
margin-top: 5px;
font-style: italic;
}

.input-row {
display: flex;
flex-wrap: wrap;
gap: 20px;
margin-bottom: 20px;
align-items: center;
}

.button-row {
display: flex;
justify-content: center;
margin-bottom: 20px;
}

@media (max-width: 768px) {
.calculator-container {
width: 90%;
}

.calc-input {
min-width: 100%;
}

.input-row {
flex-direction: column;
align-items: stretch;
}

.calc-select {
width: 80px;
max-width: 200px;
align-self: center;
}
}