<div class="calculator">
<output></output>
</div>
* {
margin: 0;
padding: 0;
box-sizing: border-box;
}
body {
height: 100vh;
background: radial-gradient(circle, skyblue, steelblue);
display: flex;
justify-content: center;
align-items: center;
}
.calculator {
width: 320px;
height: 480px;
background: #eee;
border-radius: 5px;
box-shadow: 2px 2px 3px rgba(0, 0, 0, 0.2), -2px -2px 3px rgba(0, 0, 0, 0.2);
}
output {
display: flex;
justify-content: center;
align-items: center;
width: 300px;
height: 40px;
background: #fff;
margin: 10px auto;
border-radius: 5px;
font-size: 1.4em;
font-weight: bold;
box-shadow: inset 1px 1px 1px rgba(0, 0, 0, 0.3),
inset -1px -1px 1px rgba(0, 0, 0, 0.3);
}
.keyboard {
height: 440px;
display: flex;
flex-wrap: wrap;
justify-content: space-evenly;
align-items: flex-start;
}
button {
margin: 0.5em 1em;
width: 40px;
height: 40px;
display: flex;
justify-content: center;
align-items: center;
background: none;
border: none;
cursor: pointer;
font-size: 1em;
font-weight: bold;
}
const output = document.querySelector('output')
const div = document.createElement('div')
div.classList.add('keyboard')
document.querySelector('.calculator').appendChild(div)
'C CE % / 7 8 9 * 4 5 6 - 1 2 3 + 0 ( ) ='.split(' ')
.map(symbol => {
div.insertAdjacentHTML('beforeend', `<button value="${symbol}">${symbol}</button>`)
})
div.addEventListener('click', e => {
if(e.target.tagName === 'BUTTON') {
calc(e.target.value)
}
})
document.addEventListener('keydown', e => {
if ((e.key).match(/[0-9%\/*\-+\(\)=]|Backspace|Enter/)) calc(e.key)
})
function calc(value) {
if (value.match(/=|Enter/)) {
try {
if (output.textContent !== '') {
output.textContent = Math.trunc(math.evaluate(output.textContent))
}
} catch {
let oldValue = output.textContent
let newValue = 'недопустимое выражение'
output.textContent = newValue
const timer = setTimeout(() => {
output.textContent = oldValue
clearTimeout(timer)
}, 1500)
}
} else if (value === 'C') {
output.textContent = ''
} else if (value.match(/CE|Backspace/)) {
output.textContent = output.textContent.substring(0, output.textContent.length - 1)
} else {
output.textContent += value
}
}
This Pen doesn't use any external CSS resources.