Develop Reference

show div based on another divs scroll position

I am trying to create an effect similar to "Show div on scrollDown after 800px" answered by apaul34208 in this thread.
The problem is that I am also using this parallax effect on my website, which disables the normal window scroll, so the entire website is scrolling inside a certain div (.parallax) with 100% height. This also disables the desired effect.
Since the div I want to hide or show is supposed to be in fixed position it has to be located outside the scrolling .parallax div, but read the scroll position of the same div.
I have also tried solution from this thread, but I can't seem to make it work.
Right now I am using this script:
$(document).scroll(function() {
var y = $(this).scrollTop();
if (y > 800) {
$('.bottomMenu').fadeIn();
} else {
$('.bottomMenu').fadeOut();
}
});
which is working fine on non-parallax pages except for that the fixed div is displayed when page loads on top, disappears when scrolling down 1 px only to appear again after scrolling down 800 px.
But I guess I can't use scrollTop in what I am trying to achieve.
Any suggestions?

Have you tried:
.bottomMenu {
display: none;
}
If not, it will be shown when the page is loaded (the scroll function is not fired because you haven't scrolled yet) and hidden if you start scrolling because the if statement is evaluated as false because the y position is <800 and $('.bottomMenu').fadeOut(); runs.

Increase top position of element on scroll until height is reached (jQuery)

I have two containers set up on a page, the first and second. The second is after the first container.
I'm trying to write a jQuery function that upon reaching the end of the first container, on scroll, it changes the top position of the second container (negative top position) so it feels as if the second container is being scrolled up and over the first container.
I have the following so far, which is doing a few things to get me started. Firstly, on scroll, I know when I reach the bottom of the first container and when the trigger should happen to begin scrolling the second container up. But then, I am not very sure how to get the top position to negatively increment as I scroll.
Any help?
function caseStudyScroll() {
var secondContainerHeight = $('.second-container').height();
$(window).scroll(function() {
if ($(document).height() - secondContainerHeight <= ($(window).height() + $(window).scrollTop())) {
var windowScroll = $(window).scrollTop();
} else {
}
});
}
caseStudyScroll();

Rather than using jQuery to handle the scrolling, you could use CSS transitions when you hit the trigger. When you hit the trigger, add a class/id that changes its top position by whatever amount puts it where you need. In the id/class of the second container, put the following:
-webkit-transition: top 1s;
transition: top 1s;
This will move the container to the new position in one second.
Hope that helps!
EDIT: Now that I think about it, I may have misunderstood your question. Do you want this to happen constantly, while scrolling up? That is, you want your second container to stay on the page while you scroll past the first one? In that case, changing the position to fixed in a similar method should work.

Fixed placed element within certain area

I have a page where I display a long list of results from a DB query.. and I also show a Google Map to the RIGHT of this long list.
Map is roughly 240px wide and maybe 600px long/height.
This MAP is inside a container DIV (#mapContainer).. that contains the map, and a dropdown box above the map canvas.
Currently, the mapContainer scrolls along with the page itself.. what I would like to do is have it be static/fixed element. So it starts/displays/is placed where I have it currently on the page.... if I scroll the page.. the map should stay fixed.. until the end (bottom) of the results are scrolled to..
(I dont want the mapContainer to scroll and cover the footer element/div)
Following this tutorial:
http://www.webgeekly.com/tutorials/jquery/a-simple-guide-to-making-a-div-static-as-you-scroll-past-it/
It doesnt stay fixed..
//sticky map placement
$(function () {
var msie6 = $.browser == 'msie' && $.browser.version < 7;
if (!msie6) {
console.log("NOT IE 6");
var top = $('#mapContainer').offset().top;
$(window).scroll(function (event) {
console.log("scrolling.......");
var y = $(this).scrollTop();
if (y >= top) {
$('#mapContainer').addClass('fixed');
console.log("class added");
}else {
$('#mapContainer').removeClass('fixed');
console.log("class removed");
}
});
}
});
The first console.log() outputs fine.. but nothign in the window.scroll() portion fires ever.
Rest of code used:
#mapContainer{
display:table;
width:240px;
float:right;
/* sticky map */
position: absolute;
top: 458px;
left: 50%;
/* width: 100px; */
margin-left: 339px;
}
#<span class="skimlinks-unlinked">mapContainer.fixed</span> {
position: fixed;
}
On the tutorials page itself.. he has a toolbar on the left side..
that stops 'being fixed' when you scroll all the way to the top.. (it will start to move with the rest of the page scroll at a certain point).. and it doesnt go all the way down to cover the footer either.
I'm not clear why the jQuery portion isnt firing.. and I'm not clear what that last style is for? (seems odd looking)
All this absolute, fixed, relative, to parent, to viewport..etc.. is confusing.
Any easy to read/follow/understand tutorials that will get me to where I want to be? Or suggestions on what I am doing wrong with the correct approach?

I looked at your Fiddle and noticed a couple things:
Your "fixed" class was not represented in the CSS. When I looked into the CSS I saw a span element wrapping a ".fixed" reference with a position property set.
You are styling the mapContainer div using the ID. This is a very rigid selector as the order of CSS selectors goes. The hierarchy of CSS selectors is specifid and IDs will override types and classes. See: http://htmlhelp.com/reference/css/structure.html
The when scrolling, I am seeing the console logging in my dev tools. Also, when inspecting the element, I am seeing it add and remove the class name.
Based on my observations, modifying the CSS selector for your container should do the trick. Adding the ID to the class will keep the CSS rule specific enough:
#mapContainer.fixed { position: fixed; }
Refer to this updated Fiddle for an example with these changes in place:
http://jsfiddle.net/pmurst8e/4/
Update: For demonstration purposes of what I was referring to with the resize I modified your example a bit. It isn't the prettiest, but it conveys the point: http://jsfiddle.net/pmurst8e/6/
Update: There are a couple issues with the latest Fiddle (v12):
The sidebar will always go fixed the moment you scroll because "top" is never calculated. It's being set to zero, and the offset calculation is commented out.
Absolute positioning is relative to the closest positioned parent. If no parent is positioned, it's relative to the window. To constrain an absolute positioned element, set the constraining parent to "position:relative;".
Instead of using a percentage and left position rule, consider positioning the sidebar to the right, relative to the "contentContainer", by a set number of pixels.
When the fixed position takes effect, we also need to set the sidebar fixed left position. Otherwise, it will use the positioning in the CSS. In contrast to absolute positioning, Fixed positioning is relative to the window, meaning an absolute element "right: 10px" will be 10px from the right of the positioned parent, but will appear 10px from the right of the window when fixed.
You don't need a float when you have absolute positioning. Absolute position removes an element from the normal flow of the document, and because of this float does not apply.
I updated the Fiddle to show how to make these adjustments. I cleaned out the float and margin from the mapContainer and left the absolute positioning. With that I set the contentContainer to relative to constrain mapContainer to it. You will also see, on the script side, I added a line to set the offset of mapContainer. Without this, when it becomes fixed it will be 10px off the right border of the window.
Updated Fiddle: http://jsfiddle.net/pmurst8e/14/
Also, you want to leave your top offset line in tact. Without that, it goes fixed the moment the scroll moves and never goes back. When that becomes the case, you're better off just setting fixed permanently.
var top = $('#mapContainer').offset().top; // you want this
Regarding the bottom boundary, you can do a couple things:
Resize the sidebar so that it shrinks to the window size. This is demoed in my example from my first post in this and the downside is it forces the sidebar to become a scrollable div so the child content is all visible.
Use a check for the bottom so that when you hit the limit, the container goes back to an absolute position, but one set at the bottom: 0 of the parent.
Something like:
var limit = $('footer').offset().top;
var $mc = $('#mapContainer');
var pos = $mc.offset().top + $mc.outerHeight();
if (pos >= limit) {
$mc.removeClass('fixed')
.addClass('bottom-set').css('left',''); // define this in CSS for bottom absoluteness
}
#mapContainer.bottomFixed {
bottom: 0;
top: auto;
}
And to be fully honest, you might save yourself some time working this all out if you take a look at the ScrollToFixed plug-in (https://github.com/bigspotteddog/ScrollToFixed). I seem to be mentioning it quite a bit lately, but this issue seems to be a popular one right now.
Incidentally, go to your OP and click the Edit button. Shrink the height of your browser and scroll down. You should see SO has a fixed sidebar that passed the footer. ;)

Fix position of div tag inside dialog op-up

I have dialog box which comes on clicking a button. In the dialog box i have a button and other content. I want to make that button position fixed inside dialog pop-up.
$(window).bind('scroll', function() {
if ($(window).scrollTop() > 50) {
$('#footer_buttons').addClass('sticky');
}
else {
$('##footer_buttons').removeClass('sticky');
}
});
<style>
.sticky{
position : fixed;
}
</style>
I used above code to make the button position fix, it worked outside the dialog box but not working when the same code is used inside the dialog box. I can make a button fix by adding a min-height to dialog and make the dialog content scrollable. But I don't want to add any scroll to the content inside dialog box.
Can any one help me out. Thanks in advance

From MDN CSS position property:
fixed:
Do not leave space for the element. Instead, position it at a specified position relative to the screen's viewport and don't move it
when scrolled. When printing, position it at that fixed position on
every page.
So it doesn't matter where your element is. If you apply the fixed position, the top, left, right, bottom values are relative to the screen's viewport (visible area in browser).
In your case you should use absolute positioning and set the position using two of the four positioning properties: top, right, bottom, left. Don't forget to add position: relative or absolute to the modal container.

Make Divs Absolute Only To Each Other

I have <div> elements as pages, and "next" and "back" buttons to switch between them. When the "next" button is clicked, the current page fades out and the next page fades in, using jQuery. As I've been doing it so far, the only way to ensure that the divs sit on top of each other instead of sitting next to each other is to style them position:absolute. However, this forces the divs to also overlay anything else on the page that they would otherwise push out of the way.
Is there any way to make divs basically positioned absolute only relative to each other, and still act as though they are positioned relative to the rest of the page? I've tried putting them inside a container that is positioned relatively, but the divs overflow their container, making it more or less useless.
Edit:
Basic fiddle: http://jsfiddle.net/9AXS4/4/
Yes, I mix up $ and jQuery. I've been using jQuery a lot after calling jQuery.noConflict()

If your pages, as you call them, are of fixed width and height, then you can set their container to be position:relative and also have the width and height of the pages..
.container{
position:relative;
width:500px; /*the total width of a page, including padding and borders*/
height:400px; /*the total height of a page, including padding and borders*/
}
This way the container element will handle the pushing around of the other elements
Here is your corrected fiddle: http://jsfiddle.net/gaby/9AXS4/2/
(the width/height of the container must account for paddings and border on the page elements)
Also you were targeting the container with .pagecontainer instead of #pagecontainer (since you used an id)
Update (after comment about arbitrary heights..)
Since your pages height is not fixed, you will need to resort to jQuery to resize the container..
Here is a full demo : http://jsfiddle.net/gaby/9AXS4/7/

The divs can't be positioned absolute in relation to each other, but they can be positioned absolutely in relation to an outer div. The container that holds the page divs should have position: relative in order to contain the inner page divs that are absolutely positioned.
If there is unwanted overlap, you can use overflow: hidden or overflow: auto on the outer div to hide it, depending on whether or not you want to allow for scrolling. If you are going to use the overflow property, be sure to include a height and width so the browser knows where the overflow should be.
http://jsfiddle.net/vkTXs/
$(".page").each(function(){
jQuery(this).hide();
});
$(".page").first().show();
$(".next").click(function() {
jQuery(this)
.parent().fadeOut()
.next().fadeIn();
var page = $(this).parent().next();
resizeContainer(page);
});
$(".back").click(function() {
jQuery(this)
.parent().fadeOut()
.prev().fadeIn();
var page = $(this).parent().next();
resizeContainer(page);
});
function resizeContainer(page){
// get height of next page
var newPageHeight = $(page).height();
// add padding and border
newPageHeight = newPageHeight + 14;
$('#pagecontainer').height(newPageHeight);
}