Created
December 1, 2021 07:45
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/** | |
* 要素の幅と高さを取得します。 | |
* @param {HTMLElement} target 幅と高さを取得する要素 | |
* @return {{width: Number, height: Number}} | |
* @example | |
* const foo = getSize(document.querySelector('.foo')) | |
* console.log(foo) // => {width: 300, height: 200} | |
* console.log(foo.width) // => 300 | |
* console.log(foo.height) // => 200 | |
*/ | |
const getSize = target => { | |
const el = target | |
const isInvisibleElement = | |
window.getComputedStyle(el).getPropertyValue('display') === 'none' || | |
window.getComputedStyle(el).getPropertyValue('height') === '0px' | |
// style属性値があれば保存、なければ空文字を保存する | |
const styleAttrDisplay = el.style.display === '' ? '' : el.style.display | |
const styleAttrPosition = el.style.position === '' ? '' : el.style.position | |
const styleAttrVisibility = el.style.visibility === '' ? '' : el.style.visibility | |
const styleAttrHeight = el.style.height === '' ? '' : el.style.height | |
// 幅と高さが取得できない要素は、不可視状態で取得する | |
if (isInvisibleElement) { | |
el.style.setProperty('display', 'block', 'important') | |
el.style.setProperty('position', 'relative', 'important') | |
el.style.setProperty('visibility', 'hidden', 'important') | |
el.style.setProperty('height', 'auto', 'important') | |
} | |
// 幅を取得する | |
const elementWidth = el.getBoundingClientRect().width | |
// 高さを取得する | |
const elementHeight = el.getBoundingClientRect().height | |
// 元のstyle属性に戻す | |
if (isInvisibleElement) { | |
el.style.display = styleAttrDisplay | |
el.style.position = styleAttrPosition | |
el.style.visibility = styleAttrVisibility | |
el.style.height = styleAttrHeight | |
} | |
return { | |
width: elementWidth, | |
height: elementHeight, | |
} | |
} | |
export { getSize } |
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