主视口的正确 HTML 滚动元素 (+jQuery)

发布于 2024-10-06 02:35:13 字数 274 浏览 3 评论 0原文

当我想通过 javascript 代码滚动网站时,要设置 .scrollTop 属性的正确元素是什么?

windowdocumentdocument.body 还是 html 元素?

jQuery 是否有一些技巧来检测滚动主视口的意图并统一调用?在我看来,有时 $(window).scroolTop(value) 有效,但有时却无效。

When I want to scroll a website by javascript code what is the corrent element to set the .scrollTop property on?

Is it window, document, document.body or html element?

Does jQuery have some trick to detect the intention to scroll the main viewport and unify the calls? It seems to me that sometimes $(window).scroolTop(value) works, but sometimes it doesn't.

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终止放荡 2024-10-13 02:35:14

通常, 元素,又名 document.documentElement。但是,如果您使用 Quirks 模式,则 (document.body) 代表视口。 (HTML/CSS 没有明确声明/要求这一点,但这是所有现代浏览器的工作方式。)

您永远不想处于 Quirks 模式,但如果您正在编写一个包含在其他人的页面上的脚本,您就会发现必须处理它:

var viewport= document.compatMode==='BackCompat'? document.body : document.documentElement;
// do something with viewport.scrollTop

jQuery 使用 window.scrollTo() 而不是直接设置滚动属性。无论哪种方式在实践中都几乎相同。您可能会说使用 scrollTo 更简洁,因为它避免了依赖于特定元素表示的视口,但 jQuery 仍然必须使用 scrollTop/scrollLeft 无论如何都可以读取“other”属性的当前值,所以没有什么大的胜利。您可以使用 pageXOffset/pageYOffset 来读取当前滚动位置,而不依赖于特定元素,但并非所有地方都支持它,因此您仍然必须回退到 scrollTop 方法。

遗憾的是,这些属性/方法过去都没有标准化。 CSSOM 视图最终解决了这个问题。

Normally, the <html> element, aka document.documentElement. However if you are using Quirks Mode, <body> (document.body) represents the viewport instead. (HTML/CSS doesn't explicitly state/require this, but it is how all modern browsers work.)

You don't ever want to be in Quirks Mode, but if you're writing a script for inclusion on other people's pages you will have to deal with it:

var viewport= document.compatMode==='BackCompat'? document.body : document.documentElement;
// do something with viewport.scrollTop

jQuery uses window.scrollTo() instead of setting the scroll properties directly. Either way is pretty much the same in practice. You could argue that using scrollTo is a bit cleaner in that it avoids relying on the viewport being represented by a particular element, but then jQuery still has to use scrollTop/scrollLeft to read the current value of the ‘other’ property anyway, so no big win. You can use pageXOffset/pageYOffset to read the current scroll position without relying on a particular element, but it's not supported everywhere so you still have to fallback to the scrollTop method.

Sadly none of these properties/methods have been standardised in the past. CSSOM Views finally address this.

小情绪 2024-10-13 02:35:14

bobince 的答案有一个附加条件,即 Webkit 浏览器错误地将 documentElement.scrollTop 设置为零,无论您处于怪异模式还是标准模式;因此,你不能完全依赖他的俏皮话。

https://bugs.webkit.org/show_bug.cgi?id=9248

http://code.google.com/p/chromium/issues/detail ?id=2891

拥有足够权限的人应该将此评论作为 bobince 答案的评论,这样就不会错过,然后我就可以删除这篇文章。

There's a rider to bobince's answer, which is that Webkit browsers incorrectly set documentElement.scrollTop to zero regardless of whether you are in quirks or standards mode; therefore, you cannot completely rely on his one-liner.

https://bugs.webkit.org/show_bug.cgi?id=9248

http://code.google.com/p/chromium/issues/detail?id=2891

Someone with sufficient privileges should make this a comment to bobince's answer so that it is not missed, and I can then delete this post.

不忘初心 2024-10-13 02:35:14

取决于您滚动的内容,文档/窗口或分区

Depends on what you are scrolling, document/Window or a division

云雾 2024-10-13 02:35:14

我以前也遇到过这个问题,并且它在许多浏览器中的表现完全不同。我最终使用了这段相当可怕的代码:

function scrollToTop() {
    $('body, html').scrollTop(0);

    if ($.browser.webkit || $.browser.safari) {
        // Hack for webkit browsers: hide and show canvas layer so window will scroll up.
        // (scrollTop does not work right).
        $('#canvas').hide();
        window.setTimeout(function () {
            $('#canvas').show();
        }, 0);
    }
}

但是,我只需要滚动到顶部,这更容易。如果您想滚动到特定点,我不确定您会如何执行此操作。也许使用锚点?

I had this problem before as well, and it behaved quite differently in a number of browsers. I ended up using this rather horrible piece of code:

function scrollToTop() {
    $('body, html').scrollTop(0);

    if ($.browser.webkit || $.browser.safari) {
        // Hack for webkit browsers: hide and show canvas layer so window will scroll up.
        // (scrollTop does not work right).
        $('#canvas').hide();
        window.setTimeout(function () {
            $('#canvas').show();
        }, 0);
    }
}

However, I only needed to scroll to the top, which is easier. I'm not sure how you would do this if you want to scroll to a specific point. Maybe use anchors?

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