Develop Reference

scrollTo not scrolling to the start of the element

I tried to implement the scrollTo funcion but the problem is that when i scroll i want the element that i scrolled to at the topof the screen not in the middle or somewhere else.
JsFiddle
here is the js funcion
$(document).ready(function () {
$(".scroll").click(function (event) {
$('html,body').animate({
scrollTop: $("#footer").offset().top
}, 500);
});
});

Your problem here is that there is not enough space at the bottom of the screen to scoll so that the targets ends at the top. The scrollbar is fully at the bottom.
Add a lot of whitespace at the end of the page, this will give more room for scrolling. When you do this, your code works just fine.

It is because your page isn't tall enough. To make a javascript function that automatically makes the page high enough (no matter what is in it) do:
$("body").height("100%");
$("html").height(($("body").height()) + 500);
see: http://jsfiddle.net/ZNV7G/1/
If you want to be extra sure you can replace the + 500 with * 2, but that will be a bit excessive in smaller documents.

IOS - after jquery animate scrollTop, it prevents divs being clicakble until user scrolls manually

$('.topNavigationBtn').on('click',function (e) {
var target = $(this).attr('targetId');
$("body").animate({ scrollTop: $(target).offset().top }, 1000);
})
Please note this isn't on all IOS devices, but on some, after the first animation, until the user manually scrolls the page the topNavigationBtn's are no longer clickable. Any ideas why this would be would much appreciated.

The answer is to hack.
If you add a div at the bottom of the page, that you change the height of on animate complete, this then lets IOS update the scrollTop, without the user needing to scroll themselves.
J

Jquery Sticky Nav Issue

I'm been trying to get my head around issue and seem to cant find some help.
http://fiddle.jshell.net/DQgkE/7/show/
The experience is a bit jumpy and buggy now- but what i will like is
1) When you scroll down the page. I want the Sticky Nav to be (disable,dropped off, stop) at a specific location(chapter-3) on the page and the user should have the ability to keep scrolling down.
2) When the user is scrolling back up, the code will stick the nav back and carry it up until the nav reaches the original position at the top.
Below is a starting point.
3) Currently is kinda of doing that but there's some huge jump going on when scrolling back up
http://imakewebthings.com/jquery-waypoints/#doc-disable
using disable, destroy, enable option will be nice.
This is a original experience cleaned: http://fiddle.jshell.net/DQgkE/1/show/
Thanks for the help in Advance.

I'm not sure how this plugin you used work, but I have a solution I wrote a while back that I wrote in jquery. It has few variables at the top, the item you wanted sticky, the item where you want it to stop, and the class to add when it becomes sticky and padding at the top and bottom. I only modified the javascript portion in this fork.
EDIT
I went ahead and fixed the original code. Solution without waypoint plugin is in comments.
Here is the result:
http://fiddle.jshell.net/Taks7/show/

I would recommend to use jQuery (that was a surprise, right?! :P)
$(document).ready(function() { //when document is ready
var topDist = $("nav").position(); //save the position of your navbar !Don't create that variable inside the scroll function!
$(document).scroll(function () { //every time users scrolls the page
var scroll = $(this).scrollTop(); //get the distance of the current scroll from the top of the window
if (scroll > topDist.top - *distance_nav_from_top*) { //user goes to the trigger position
$('nav').css({position:"fixed", width: "100%", top:"*distance_nav_from_top*"}); //set the effect
} else { //window is on top position, reaches trigger position from bottom-to-top scrolling
$('nav').css({position:"static", width:"initial", top:"initial"}); //set them with the values you used before scrolling
}
});
});
I really hope I helped!

jQuery window scroll event. For every XX pixels scrolled

I am using the excellent jQuery Reel plugin (http://jquery.vostrel.cz/reel) for a project. I would like to bind to the window scroll event, so when the user scrolls down the page the plugin advances 1 frame for say every 10px scrolled, if the user scrolls up the animation is reversed.
The plugin has methods I can pass the values to no problem and I know how to bind to the window scroll event. What I am struggling with is the last.
How can I use jQuery/JavaScript to say for every 10 pixels scrolled in any vertical direction advance 1 frame in the animation? I know I can store the window scroll in a variable but I'm unsure how to say every time it hits a multiple of 10 advance one frame.
Many thanks in advance.
EDIT
Thanks to help of the users below I worked out a solution. As follows:
$(window).scroll(function()
{
windowScrollCount = $(this).scrollTop();
animationFrame = Math.round(windowScrollCount / 100);
});
So here I am getting the scrolled distance in windowScrollCount, translating it into frames in animationFrame and setting it back with .reel("frame", animationFrame); I am actually doing this for every 100 frames as every 10 was to quick.

Thanks to help of codef0rmer and noShowP I worked out a solution. As follows:
$(window).scroll(function()
{
windowScrollCount = $(this).scrollTop();
animationFrame = Math.round(windowScrollCount / 100);
});
So here I am getting the scrolled distance in windowScrollCount, translating it into frames in animationFrame and setting it back with .reel("frame", animationFrame); I am actually doing this for every 100 frames as every 10 was to quick.

If I'm wrong then you might want this:
var jump = 500; // consider this is your 10px
window.scrollHeight = 0;
$(window).scroll(function () {
console.log($(this).scrollTop());
var diff = $(this).scrollTop() - window.scrollHeight;
if (diff >= jump) {
window.scrollHeight = $(this).scrollTop();
console.log('reload frame');
}
});
Demo : http://jsfiddle.net/Dyd6h/

You could possible have a sticky element to the top of your page,
position: fixed; top 0; left: 0;
(hidden if you like).
And then when you are scrolling you can monitor its offset:
$('element').offset().top
You can then see how far down the page you have scrolled, so every time they scroll see what its top value is and trigger events appropiately?
EDIT:
I've set up a little JSfiddle with a start of what I think you need.
http://jsfiddle.net/qJhRz/3/
Im just calculating the frame you need to be on and storing that in a variable. Is it anything like what you're looking for?

Why does .animate to scrollTop jump to 0 before animating?

I am playing with Parallax scrolling like on that nike site. So I have been using scrollTop to determine the user's vertical position on the page and then I've been adjusting element's positions based on the changes to that value.
Here I round the scrollTop value and log it. I'll show the log later.
var distance = 60*(Math.round($(window).scrollTop()/60));
console.log(distance);
Then, on click, I call this function which scrolls to the scrollTop value that I've passed it.
function goTo(n){
console.log('begin animating');
$('html,body').animate({scrollTop: n},2000);
}
Here's the problem, the scroll top value jumps to 0 before animating.
So I'll be halfway down the page and it logs:
begin animating
0
6240
6180
6120
// etc...
The way I'm positioning stuff relies on the accuracy of the scrollTop value. So my question is:
How can I keep the scrollTop value from jumping to 0 before going through with the animation?
Let me know if theres any more info needed.
Heres the live version of the site: http://theblueeyeguy.com/moon/Illumination/
(click 'Next' then 'Prev' to break it)

Probably because you're using a link with href="#".
Add return false; to your onclick attribute.
< Prev |