I have a sidebar which are scrollfollow, that means it works as it is set to position:fixed. However, the sidebar continue scrolling till the user stop. This results in the elements on the bottom of the site doesn't reach the sight of the user, because the sidebar push elements down.
I have created a fiddle to illustrate the exact problem: jsd https://jsfiddle.net/Lv4humd6/2/
The javascript that makes the div scrollfollow:
$(function() {
var $sidebar = $("#sidebar-right"),
$window = $(window),
offset = $sidebar.offset(),
topPadding = 15;
$window.scroll(function() {
if ($window.scrollTop() > offset.top) {
$sidebar.stop().animate({
marginTop: $window.scrollTop() - offset.top + topPadding
});
} else {
$sidebar.stop().animate({
marginTop: 0
});
}
});
});
What I want is the sidebar to stop scrolling, when it reach the div break as you see in the jsfiddle. I have searched and tried everything, but I can't find any solution for it.
Related
I have a scrolling page with a navbar and I want the section the user is scrolling through to be highlighted in the navbar. At the moment it almost accomplishes this, but is highlighting the incorrect link.
A demonstration is at http://codepen.io/meek/pen/NNprYb?editors=1000
The code that does this is as follows:
// highlight current tab
$(window).on("scroll", function() {
var currentPos = $(window).scrollTop();
$('.nav li a').each(function() {
var sectionLink = $(this);
var section = $(sectionLink.attr('href'));
if(section.position().top <= currentPos && sectionLink.offset().top + section.height() >= currentPos) {
$('.nav li').removeClass('active');
sectionLink.parent().addClass('active');
}
else {
sectionLink.parent().removeClass('active');
}
});
});
I've tried several things, but can't get it to reliably add the active class to the correct session. Help appreciated!
edit: to be clearer, the problem is that it's only highlighting the section when you've scrolled a bit into it, instead of right at the top, meaning that when you click a section to scroll to the top of that section automatically, that section is not highlighted.
edit2: So changing the if statement to:
if(currentPos + $('#nav-wrapper').outerHeight() >= section.position().top && currentPos + $('#nav-wrapper').outerHeight() <= sectionLink.offset().top + section.outerHeight()) {
has made an improvement although not completely fixed the issue. The home, about and portfolio sections all highlight the correct link but not contact.
You need to account for the height of the navbar and subtract it from the top of the section you want highlighted.
The height is currently hardcoded in your CSS at 75px but I included a jQuery selector for the height in case it needs to change/disappear for smaller screens.
Nice work by the way.
$(window).on("scroll", function() {
var currentPos = $(window).scrollTop();
$('.nav li a').each(function() {
var sectionLink = $(this);
// capture the height of the navbar
var navHeight = $('#nav-wrapper').outerHeight() + 1;
var section = $(sectionLink.attr('href'));
// subtract the navbar height from the top of the section
if(section.position().top - navHeight <= currentPos && sectionLink.offset().top + section.height()> currentPos) {
$('.nav li').removeClass('active');
sectionLink.parent().addClass('active');
} else {
sectionLink.parent().removeClass('active');
}
});
});
I need my sidebar to scroll up and down with the window but stop when the div is at its top or bottom. The code below works when the page is first loaded and scrolled down or when the page is scrolled up slowly, but when the page is scrolled to the very bottom of the sidebar div, the page has to reach the top (and then some) in order to trigger that margin change.
Is there some other trigger I should be looking for besides just on scroll? How can I adjust this code to properly adjust the div?
$(window).on("load scroll", function() {
var scrollYpos = $(document).scrollTop();
var sidebarinfo = $("#sidebar").offset().top + $("#sidebar").height();
var windowinfo = $(window).height() + $(window).scrollTop();
if ((windowinfo)<(sidebarinfo)){
$('#sidebar').css('margin-top', -scrollYpos);
}
});
The sidebar div is fixed position. If I use absolute position, the div scrolls fine, but it doesn't stop when the bottom of the div has been reached - it just continues to scroll with the window.
I've fixed the main part of the problem with this code.
$(window).on("load scroll", function() {
var sidebarinfo = $("#sidebar").scrollTop() + $("#sidebar").height();
var windowinfo = $(window).innerHeight() + $(window).scrollTop();
if ((windowinfo)<(sidebarinfo)){
$('#sidebar').css('top', -($(window).scrollTop()));
}
});
The only problem is on page load, the sidebar gets stuck in the wrong position until it is scrolled all the way up (and more).
I actually figured out that I needed to adjust a few things and add an else clause:
$(window).on("scroll", function() {
var scrollmargin = $(window).scrollTop() - $("#sidebar").outerHeight();
var sidebarinfo = $("#sidebar").scrollTop() + $("#sidebar").outerHeight();
var windowinfo = $(window).innerHeight() + $(window).scrollTop();
console.log($(window).scrollTop());
if ((windowinfo)<(sidebarinfo)){
$('#sidebar').css('top', (sidebarinfo + scrollmargin)*-1);
}
else {
var margintop = $(window).innerHeight() - $("#sidebar").outerHeight();
$('#sidebar').css('top', margintop);
}
});
I am trying to get an fly-in / fly- out effect happening
Scroll down - animate in
Scroll-up animate out
To get a similar effect to the nizo website
http://nizoapp.com/
I have used this code I found on Stackoverflow "Fade in element on scroll down using css"
to determine whether the element is on screen, in the viewport, and then animate it.
$(window).scroll(function () {
/* Check the location of each desired element */
$('.article').each(function (i) {
var bottom_of_object = $(this).position().top + $(this).outerHeight();
var bottom_of_window = $(window).scrollTop() + $(window).height();
/* If the object is completely visible in the window, fade it it */
if (bottom_of_window > bottom_of_object) {
$(this).animate({
'opacity': '1'
}, 500);
}
});
});
Which works quite well.
I have added it to this demo page, and modified it.
http://saigonhousefinder.com/potteryone/fadinonscroll.html
(probably not live for long)
I have used css transitions to get the effect I am looking for. FLy-in Fly-out etc etc
And then I found..... this function which does the same thing
function isScrolledIntoView(elem)
{
var docViewTop = $(window).scrollTop();
var docViewBottom = docViewTop + $(window).height();
var elemTop = $(elem).offset().top;
return ((elemTop <= docViewBottom) && (elemTop >= docViewTop));
}
Anyway.......
I cant get the animations to work when scrolling down, fly-in.
But I cannot get the animations to go in reverse when they fly out on scroll up
I thought the easiest way would be to detect if you are scrolling down of up, so I found this method / function
(function () {
var previousScroll = 0;
$(window).scroll(function () {
var currentScroll = $(this).scrollTop();
if (currentScroll > previousScroll){
$("#div").fadeIn("slow");
}
else {
$("#div").fadeOut("slow");
}
previousScroll = currentScroll;
});
}());
Which works well, but I cannot get it working.
At this point I can detect when an element is visible on the screen then add an effect to it.
What I need it to detect when that same element is beginning to go off the screen and apply another effect to it.
Any help on how to get this working would be great
Have a nice day
That's a really neat demo and a great concept! I played around with some code and it seems that you are almost there. You need to detect when the top of the screen meets the top of the element, so only calculate the offset once when the page is loaded. I added a 20px threshold so it kicks in a bit early. Let me know if this helps, it can be tweaked depending on how and when you want to call it. Here is a simple js fiddle demo
http://jsfiddle.net/XhAhR/23/
(function () {
var previousScroll = 0;
var elemTop = $("#div").offset().top;
$("#div").fadeOut();
$(window).scroll(function () {
var currentScroll = $(this).scrollTop();
if (currentScroll > previousScroll){
if(elemTop -20 > currentScroll){
$("#div").fadeIn("slow");
}
}
else {
if(elemTop - 20 > currentScroll){
$("#div").fadeOut("slow");
}
}
previousScroll = currentScroll;
});
}());
I've been working on a website with a mobile version that has a fixed header, and I want to get the same effect while scrolling down to hide the navigation, only to reveal it when you scroll up more than 5 pixels.
Just like teehanlax.com. I've given a it a shot using some code I found online, but it behaves strangely. It's hiding on scroll down, but only reveals again, seemingly... randomly.
Here is my code.
//Hide Header on on scroll down
$(function(){
var lastScrollTop = 0, delta = 5;
$(window).scroll(function(event){
var st = $(this).scrollTop();
if(Math.abs(lastScrollTop - st) <= delta)
return;
if (st > lastScrollTop){
// Scroll Down
$("header").delay(100).queue(function() {
$(this).addClass("animated fadeOutUp");
$(this).dequeue();
});
} else {
// Scroll Up
$('header').delay(100).queue(function() {
$(this).removeClass("fadeOutUp").addClass("animated fadeInDown");
$(this).dequeue();
});
}
lastScrollTop = st;
});
});
The JS you posted looks pretty sound, it might be more of a CSS issue. Can you post the CSS that goes along with this?
I found the following script to make a menu have a smooth animation following the screen when scrolling.
However, it's pushing down the footer, resulting the page height expanding with no further content. How do I make it stop scrolling when it collides with the footer?
Here's the code:
$(function() {
var $sidebar = $("#indhold_right"),
$window = $(window),
offset = $sidebar.offset(),
topPadding = 0;
$window.scroll(function() {
if ($window.scrollTop() > offset.top) {
$sidebar.stop().animate({
marginTop: $window.scrollTop() - offset.top + topPadding
}, "fast");
} else {
$sidebar.stop().animate({
marginTop: 0
});
}
});
});
Let us take a step back and see why it is happening the way it is happening.
When you scroll $window.scrollTop() AND offset.top both change. However, the former will always be greater than the latter. So, every time you scroll, your if condition evaluates to true and you are calling the animate function on it. You don't have a stop.
How do we put a stop? By putting a stop check beyond which you don't animate. When the page loads get the $("#footer").offset().top which is the footer height when you start. So, the check is against $window.scrollTop() which should be lesser than the footer top.
Will that check work? Yes, but it will not be pleasant(unless you want it that way) because your side bar has height and the stop works only after your sidebar top has reached the footer height(stop). So, just add the sidebar height to your stop. This will not be 100% accurate, there will be padding, margins, and other stuff that are not accounted for in this stop, but it looks pretty good and I think, you can continue from there.
Before I give you the code answer, please take a look at http://sscce.org/ (as mentioned by #Zeta). Always follow this. I had some time and a good mood. I wouldn't have even looked at it otherwise.
Below is the code. Working example - http://jsfiddle.net/H3Dqr/
$(function() {
var $sidebar = $("#indhold_right"),
$window = $(window),
offset = $sidebar.offset(),
topPadding = 0,
stop = $("#footer").offset().top;
$window.scroll(function() {
if ($window.scrollTop() > offset.top) {
if ($window.scrollTop() + $sidebar.height() < stop) {
$sidebar.stop().animate({
marginTop: $window.scrollTop() - offset.top + topPadding
}, "fast");
}
} else {
$sidebar.stop().animate({
marginTop: 0
});
}
});
});