当网址包含锚点时,获取页面加载时网页滚动条的垂直位置 [英] Get vertical position of scrollbar for a webpage on pageload when the url contains an anchor
问题描述
我正在使用jQuery的scrollTop()方法来获取页面加载时滚动条的垂直位置.在执行网址中的锚点之后,我需要获取此值(例如,网址:www.domainname.com#foo).我可以使用以下代码,并且它可以在Firefox和IE中运行:
I am using jQuery's scrollTop() method to get the vertical position of the scroll bar on pageload. I need to get this value after the anchor in the url is executed (ex url: www.domainname.com#foo). I can use the following code and it works in Firefox and IE:
ex url:www.domainname.com#foo
ex url: www.domainname.com#foo
$(document).ready(function() {
if ($(this).scrollTop() > 0) {
// then a conditional statement based on the scrollTop() value
if ($(this).scrollTop() > $("#sidenav").height()) { ...
但是在Safari和Chrome中,document.ready()似乎在锚点之前执行,因此在这种情况下scrollTop()在页面加载时返回0.在Chrome和Safari中执行锚定位后,如何在页面加载时访问scrollTop()值?
But in Safari and Chrome document.ready() seems to execute before the anchor so scrollTop() returns 0 on page load in this scenario. How can I access the scrollTop() value on page load after the anchor executes in Chrome and Safari?
推荐答案
您可能只想做像setTimeout
这样的快捷操作,要花多毫秒才能可靠地从Chrome或Safari获得它
You might just want to do something quick-and-dirty like setTimeout
for however many milliseconds it takes to get it from Chrome or Safari reliably
var MAX_CHECKS = 5; // adjust these values
var WAIT_IN_MILLISECONDS = 100; // however works best
var checks = 0;
function checkScroll() {
if ($(this).scrollTop() > 0) {
// then a conditional statement based on the scrollTop() value
if ($(this).scrollTop() > $("#sidenav").height()) {
...
}
} else {
if (++checks < MAX_CHECKS) {
// just to make sure, you can try again
setTimeout(checkScroll, WAIT_IN_MILLISECONDS);
}
}
}
$(document).ready(function() {
// You can also throw in an if statement here to exclude
// URLs without # signs, single out WebKit browsers, etc.
setTimeout(checkScroll, WAIT_IN_MILLISECONDS);
...
});
请注意,您也可以使用if ($.browser.webkit)
,尽管该功能已被弃用,并且可能移至插件而不是主jQuery(有利于功能检测).
Note that you can also use if ($.browser.webkit)
, although this feature is deprecated and may be moved to a plugin instead of the main jQuery (in favor of feature detection).
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