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Javascript - Custom Range Slider 본문

Javascript

Javascript - Custom Range Slider

HiroDaegu 2021. 10. 14. 00:04
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<!DOCTYPE html>
<html lang="ko">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Custom Range Slider</title>
  <link rel="stylesheet" href="style.css">
  <script defer src="main.js"></script>
</head>
<body>
  <h2>Custom Range Slider</h2>
  <div class="range-container">
    <input type="range" id="range" min="0" max="100">
    <label for="range">50</label>
  </div>
</body>
</html>
@import url('https://fonts.googleapis.com/css?family=Lato&display=swap');

* {
  box-sizing: border-box;
}

body {
  background-image: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
  font-family: 'Lato', sans-serif;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100vh;
  overflow: hidden;
  margin: 0;
}

h2 {
  position: absolute;
  top: 10px;
}

.range-container {
  position: relative;
}

input[type='range'] {
  width: 300px;
  margin: 18px 0;
  -webkit-appearance: none;
}

input[type='range']:focus {
  outline: none;
}

input[type='range'] + label {
  background-color: #fff;
  position: absolute;
  top: -25px;
  left: 110px;
  width: 80px;
  padding: 5px 0;
  text-align: center;
  border-radius: 4px;
  box-shadow: 0 0 5px rgba(0, 0, 0, 0.3);
}

/* Chrome & Safari */
input[type='range']::-webkit-slider-runnable-track {
  background: purple;
  border-radius: 4px;
  width: 100%;
  height: 10px;
  cursor: pointer;
}

input[type='range']::-webkit-slider-thumb {
  -webkit-appearance: none;
  height: 24px;
  width: 24px;
  background: #fff;
  border-radius: 50%;
  border: 1px solid purple;
  margin-top: -7px;
  cursor: pointer;
}

/* Firefox */
input[type='range']::-moz-range-track {
  background: purple;
  border-radius: 4px;
  width: 100%;
  height: 13px;
  cursor: pointer;
}

input[type='range']::-moz-range-thumb {
  -webkit-appearance: none;
  height: 24px;
  width: 24px;
  background: #fff;
  border-radius: 50%;
  border: 1px solid purple;
  margin-top: -7px;
  cursor: pointer;
}

/* IE */
input[type='range']::-ms-track {
  background: purple;
  border-radius: 4px;
  width: 100%;
  height: 13px;
  cursor: pointer;
}

input[type='range']::-ms-thumb {
  -webkit-appearance: none;
  height: 24px;
  width: 24px;
  background: #fff;
  border-radius: 50%;
  border: 1px solid purple;
  margin-top: -7px;
  cursor: pointer;
}
const range = document.getElementById('range')

range.addEventListener('input', (e) => {
    const value = +e.target.value
    const label = e.target.nextElementSibling

    const range_width = getComputedStyle(e.target).getPropertyValue('width')
    const label_width = getComputedStyle(label).getPropertyValue('width')

    const num_width = +range_width.substring(0, range_width.length - 2)
    const num_label_width = +label_width.substring(0, label_width.length - 2)

    const max = +e.target.max
    const min = +e.target.min

    const left = value * (num_width / max) - num_label_width / 2 + scale(value, min, max, 10, -10)

    label.style.left = `${left}px`


    label.innerHTML = value
})

// https://stackoverflow.com/questions/10756313/javascript-jquery-map-a-range-of-numbers-to-another-range-of-numbers
const scale = (num, in_min, in_max, out_min, out_max) => {
    return (num - in_min) * (out_max - out_min) / (in_max - in_min) + out_min;
  }
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