27 lines
961 B
JavaScript
27 lines
961 B
JavaScript
const range = document.getElementById('range')
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range.addEventListener('input', (e) => {
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const value = +e.target.value
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const label = e.target.nextElementSibling
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const range_width = getComputedStyle(e.target).getPropertyValue('width')
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const label_width = getComputedStyle(label).getPropertyValue('width')
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const num_width = +range_width.substring(0, range_width.length - 2)
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const num_label_width = +label_width.substring(0, label_width.length - 2)
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const max = +e.target.max
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const min = +e.target.min
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const left = value * (num_width / max) - num_label_width / 2 + scale(value, min, max, 10, -10)
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label.style.left = `${left}px`
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label.innerHTML = value
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})
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// https://stackoverflow.com/questions/10756313/javascript-jquery-map-a-range-of-numbers-to-another-range-of-numbers
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const scale = (num, in_min, in_max, out_min, out_max) => {
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return (num - in_min) * (out_max - out_min) / (in_max - in_min) + out_min;
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} |