按鍵時水平滾動整頁

Question

我有一個完全水平展開的頁面，可以通過按例如Space Bar 、 Page Down 、 Right Arrow 、 Home 、 End等滾動來導航。

我目前有兩個想解決的問題：

1. 當按下右箭頭或左箭頭鍵時，頁面移動略大於 100vw，但其目標是使頁面邊緣與 window 完美對齊。

2. 例如，如果您在到達頁面末尾時多次按下Page Down鍵，那么您將需要相同次數的Page Up按下才能向后滾動。

我將非常感謝解決此問題的任何幫助。

這是我的代碼：

 let scrollAmount = 0 const container = document.documentElement window.onload = () => { document.body.onkeyup = event => { switch (event.code) { case "Space": case "PageDown": case "ArrowRight": { scrollAmount += window.innerWidth break } case "PageUp": case "ArrowLeft": { scrollAmount -= window.innerWidth break } case "Home": case "ArrowUp": { scrollAmount = 0 break } case "End": case "ArrowDown": { scrollAmount = container.scrollWidth break } } container.scrollTo({ top: 0, left: scrollAmount, behavior: "smooth" }) } } // Reset the scrollAmount if the user scrolls back manually. window.onscroll = event => { scrollAmount = container.scrollLeft }

 * { margin: 0; padding: 0 } html { height: 100% } html, body, section { display: flex; flex-grow: 1 } body { scroll-snap-type: x mandatory; scroll-snap-points-x: repeat(100%); overflow-x: auto } section { display: grid; place-items: center; flex: 1 0 100%; scroll-snap-align: center } section:nth-of-type(1) { background: orange } section:nth-of-type(2) { background: limeGreen } section:nth-of-type(3) { background: royalBlue } h2 { color: white }

 <section><h2>1</h2></section> <section><h2>2</h2></section> <section><h2>3</h2></section>

Answer 1

添加event.preventDefault()並將偵聽器更改為keydown而不是keyup將阻止箭頭鍵的默認連續滾動。 這是有效的，因為箭頭鍵滾動是在按住時觸發的（我們現在已經阻止了），而事件偵聽器僅在抬起箭頭鍵時才被觸發。

您可以對Home和End執行相同操作（即添加event.preventDefault() ）以防止所有水平滾動。

 let scrollAmount = 0 const container = document.documentElement window.onload = () => { document.body.onkeydown = event => { // <----------- switch (event.code) { case "Space": case "PageDown": case "ArrowRight": { event.preventDefault(); // <----------- scrollAmount += window.innerWidth break } case "PageUp": case "ArrowLeft": { event.preventDefault(); // <----------- scrollAmount -= window.innerWidth break } case "Home": case "ArrowUp": { scrollAmount = 0 break } case "End": case "ArrowDown": { scrollAmount = container.scrollWidth break } } container.scrollTo({ top: 0, left: scrollAmount, }) } } // Reset the scrollAmount if the user scrolls back manually. window.onscroll = event => { scrollAmount = container.scrollLeft }

 * { margin: 0; padding: 0 } html { height: 100% } html, body, section { display: flex; flex-grow: 1 } body { scroll-snap-type: x mandatory; scroll-snap-points-x: repeat(100%); overflow-x: auto } section { display: grid; place-items: center; flex: 1 0 100%; scroll-snap-align: center } section:nth-of-type(1) { background: orange } section:nth-of-type(2) { background: limeGreen } section:nth-of-type(3) { background: royalBlue } h2 { color: white }

 <section><h2>1</h2></section> <section><h2>2</h2></section> <section><h2>3</h2></section>