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scroll html and body preferentially

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This commit is contained in:
Shin'ya Ueoka 2017-10-29 22:20:41 +09:00
parent 8314bcba62
commit 9c277d0b04
1 changed files with 13 additions and 7 deletions
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20
src/content/scrolls.js
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@ -20,13 +20,13 @@ const isVisible = (win, element) => {
return true; return true;
}; };
const isScrollable = (win, element) => { const isScrollableStyle = (win, element) => {
let { overflowX, overflowY } = win.getComputedStyle(element); let { overflowX, overflowY } = win.getComputedStyle(element);
if (element.tagName !== 'HTML' && return !(overflowX !== 'scroll' && overflowX !== 'auto' &&
overflowX !== 'scroll' && overflowX !== 'auto' && overflowY !== 'scroll' && overflowY !== 'auto');
overflowY !== 'scroll' && overflowY !== 'auto') { };
return false;
} const isOverflowed = (element) => {
return element.scrollWidth > element.clientWidth || return element.scrollWidth > element.clientWidth ||
element.scrollHeight > element.clientHeight; element.scrollHeight > element.clientHeight;
}; };
@ -36,7 +36,7 @@ const isScrollable = (win, element) => {
// method is not cached. That does not cause performance issue because in the // method is not cached. That does not cause performance issue because in the
// most pages, the window is root element i,e, documentElement. // most pages, the window is root element i,e, documentElement.
const findScrollable = (win, element) => { const findScrollable = (win, element) => {
if (isScrollable(win, element)) { if (isScrollableStyle(win, element) && isOverflowed(element)) {
return element; return element;
} }
@ -52,6 +52,12 @@ const findScrollable = (win, element) => {
}; };
const scrollTarget = (win) => { const scrollTarget = (win) => {
if (isOverflowed(win.document.documentElement)) {
return win.document.documentElement;
}
if (isOverflowed(win.document.body)) {
return win.document.body;
}
let target = findScrollable(win, win.document.documentElement); let target = findScrollable(win, win.document.documentElement);
if (target) { if (target) {
return target; return target;