javascript 找到页面的最大滚动位置
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finding the maximum scroll position of a page
提问by Neil Philip Whitehead
I have made the body of the page 200% tall so that it fits on a screen twice. Using javascript I am making it keep scrolling to the top or bottom when you scroll. For this, I need to find out the lowest scroll point of the page on any browser or screen size so that it stops when it gets there.
我已将页面主体设置为 200% 高，以便在屏幕上显示两次。使用 javascript 我让它在滚动时继续滚动到顶部或底部。为此，我需要在任何浏览器或屏幕尺寸上找出页面的最低滚动点，以便它在到达那里时停止。
No JQuery please.
Thank you.
请不要使用 JQuery。
谢谢你。
My code: (it is still being put together so needs a bit of work)
我的代码：（仍在整理中，因此需要做一些工作）
function getScrollXY() {
var x = 0, y = 0;
if( typeof( window.pageYOffset ) == 'number' ) {
// Netscape
x = window.pageXOffset;
y = window.pageYOffset;
} else if( document.body && ( document.body.scrollLeft || document.body.scrollTop ) ) {
// DOM
x = document.body.scrollLeft;
y = document.body.scrollTop;
} else if( document.documentElement && ( document.documentElement.scrollLeft || document.documentElement.scrollTop ) ) {
// IE6 standards compliant mode
x = document.documentElement.scrollLeft;
y = document.documentElement.scrollTop;
}
return [x, y];
}
function scrollup() {
if (xy[1] > 0) {
window.scrollBy(0,-100);
setTimeout(scrollup,200);
} else {
null;
}
}
function scrolldown() {
if (xy[1] < ) {
window.scrollBy(0,100);
setTimeout(scrolldown,200);
} else {
null;
}
}
function dothescroll() {
var xy = getScrollXY();
var y = xy[1];
setTimeout(function(){
if (xy[1] > y) {
scrollup();
} else {
scrolldown();
}
},200);
}
回答by Neil Philip Whitehead
This is the cross browser compatible version:
这是跨浏览器兼容版本：
var limit = Math.max( document.body.scrollHeight, document.body.offsetHeight,
document.documentElement.clientHeight, document.documentElement.scrollHeight, document.documentElement.offsetHeight );
回答by alutom
var limit = document.body.offsetHeight - window.innerHeight;
// document.body.offsetHeight = computed height of the <body>
// window.innerHeight = available vertical space in the window
Compare xy[1] < limit
比较 xy[1] < limit
Note:You might need to increase the value by margin and/or padding of the body. You can also try using clientHeightinstead of offsetHeight.
注意：您可能需要通过正文的边距和/或填充来增加值。您也可以尝试使用clientHeight代替offsetHeight.
回答by yckart
While this is not part of any specification, you could try window.scrollMaxY.
虽然这不是任何规范的一部分，但您可以尝试window.scrollMaxY.
Returns the maximum number of pixels that the document can be scrolled vertically. https://developer.mozilla.org/docs/Web/API/Window/scrollMaxY
返回文档可以垂直滚动的最大像素数。 https://developer.mozilla.org/docs/Web/API/Window/scrollMaxY
Fallback if unavailable:
如果不可用则回退：
var scrollMaxY = window.scrollMaxY || (document.documentElement.scrollHeight - document.documentElement.clientHeight)
Note, documentElementisn't always the scrolling element (some browsers use bodyinstead). The solution is the new scrollingElementproperty, which returns a reference to the Element that scrolls the document. It is specified, but still a working draft.
请注意，documentElement滚动元素并不总是（某些浏览器使用body）。解决方案是新scrollingElement属性，它返回对滚动文档的 Element 的引用。它被指定，但仍然是一个工作草案。
回答by user3815190
window.scrollTo(0, document.body.scrollHeight);
window.scrollTo(0, document.body.scrollHeight);
this will work..
这将工作..
