Get vertical position of scrollbar for a webpage on pageload when the url contains an anchor
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
$(document).ready(function() {
if ($(this).scrollTop() > 0) {
// then a conditional statement based on the scrollTop() value
if ($(this).scrollTop() > $("#sidenav").height()) { ...
But in Safari and Chrome document.ready() seems to execute before the anchor so scrollTop() returns 0 on page load in this scenario. How can I a开发者_运维技巧ccess the scrollTop() value on page load after the anchor executes in Chrome and Safari?
You might just want to do something quick-and-dirty like setTimeout
for however many milliseconds it takes to get it from Chrome or Safari reliably
var MAX_CHECKS = 5; // adjust these values
var WAIT_IN_MILLISECONDS = 100; // however works best
var checks = 0;
function checkScroll() {
if ($(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);
}
}
}
$(document).ready(function() {
// You can also throw in an if statement here to exclude
// URLs without # signs, single out WebKit browsers, etc.
setTimeout(checkScroll, WAIT_IN_MILLISECONDS);
...
});
Note that you can also use if ($.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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