Stick the bar always to footer even while animating - javascript

Recently here, I asked a question to stick a bar element always to bottom-left of the container. It seems not possible using just css. So, I ended up using javascript. Here is the Working Fiddle
Giving highlights of the previous question:
Stick the bar element to bottom-left of the container
The bar should be in bottom-left, even the container is scrolled vertically or horizontally.
The bar should come over the horizontal scrollbar, if the horizontal scrollbar is present.
The above fiddle works fine and obeys all above cases, even when the window is resized.
Now, I have the same situation but the container will get resized because of animation button click but not window resize.
Since, I am animating for one second, I am calling the same code present in the window resize function while I clicked on the animating button. But doing so is somehow breaking and isn't following the above rules/requirements.
Here is the Fiddle. (not working)
Please help.
PS: Here is the link to previous question. (if someone wants brief understanding)

Again, I solved it. I was making things complicated. Where there was need of only bottom property, I was using top and resetting it. Lots of unneccessary action in the code.
Here is the code, which is working fine.
$(function () {
$('.content').width($('body').width() - 50);
});
var stickToBottom = function (parent) {
var bar = parent.querySelector('.bar');
var top = bar.offsetTop;
parent.addEventListener('scroll', function (e) {
var el = e.currentTarget;
bar.style.bottom = -el.scrollTop + "px";
bar.style.left = el.scrollLeft + "px";
});
}
var parent = document.querySelector('.parent');
stickToBottom(parent);
$('.clickme').click(function () {
$(this).toggleClass('active');
});
Thanks to rlemon for giving a idea in javascript chat room.
Working Fiddle

Related

Sticky Bootstrap column should end with parent/content

I have seen various forms of this problem but nothing really helped me to solve the partial sticky sidebar/Bootstrap column behaviour. Let me start with the problem itself.
There is a big image close to the top of my page. Because of the page complexity, I am using Bootstrap column grid. The image spans over, let's say, 10 columns and I have left 2, belonging to the same row, on the left side to store a sidebar. This also allows me to vertically align the sidebar next to the image.
Now, the sidebar, what is now a Bootstrap column, should go sticky and should stay vertically aligned to the viewport once the scrollbar passes by. You can see in the fiddle that it kind of "jumps" instead of transitioning smoothly.
The other problem is that the sticky element/column should only remain sticky as long as its parent/container is visible. Which means that it should transition/be relative to the end of that container. Right now I have only managed to keep it sticky till the end of the page. It should stop above the red line (depicted in the fiddle).
Here is my jQuery logic so far.
$(document).ready(function(){
$(window).scroll(function(){
var elem = $("#refScroller").offset().top - ($("#refScroller").height() / 2);
var windowvalue = $(window).scrollTop();
if (elem <= windowvalue) {
$("#wannabeSticky").addClass("sticky");
}
else {
$("#wannabeSticky").removeClass("sticky");
}
});
});
I would really appreciate some ideas and hints as this has been bothering me for two days. I would love to keep the Bootstrap grid structure if possible, but feel free to give any suggestions, even those who depict the sidebar as a pure absolute div, as long as the sticky-ness works.
Thanks in advance!
EDIT: I know there is a similar problem already here, but it seems I can't make the JS logic work for my case.
So, having spent another day on it, it seems I reached a decent jQuery version that gets the job done. There is my updated fiddle.
$(document).ready(function(){
var passedMobileNavi = false;
function stickySocialNavi(reference, valueExtracted) {
var refTop = $(reference).offset().top - valueExtracted;
var scrollTop = $(window).scrollTop();
return (refTop <= scrollTop);
}
$(window).scroll(function() {
if (stickySocialNavi($("#refScroller"), $("#refScroller").height())) {
if (!passedMobileNavi) {
passedMobileNavi = true;
$("#wannabeSticky").addClass("sticky");
}
}
else {
passedMobileNavi = false;
$("#wannabeSticky").removeClass("sticky");
}
if (stickySocialNavi($("#end"), $(window).height())) {
var var1 = $(window).scrollTop(),
var2 = $("#end").offset().top,
var3 = $(window).height();
var calculateOffset = (var2 - var3) - var1;
$("#wannabeSticky").css("top", "calc(50% + " + calculateOffset + "px)");
}
else {
$("#wannabeSticky").css("top", "50%");
}
});
});
For the sticky-ness to start, I took the reference point (which is the non-moving element right next to it) and its height. The sticky element gets a fixed position as long as the scrollbar goes past the reference point's center.
As the stick element is centered, it gets additional top offset values when the end of its container is reached. It is still fixed, but its top property's value takes the scroll difference, thus slowly depicting it towards the end of the container.
I don't know if this is the most elegant, straightforward, or easy to implement/understand solution, but it worked for me.

sticky navbar does not work on mobile while scrolling

I've created a sticky navbar for a subnav, which should stick at the top of the screen when the user scrolls down. Therefore I've tried some javascript, which changes the position to 'fixed' when the top is reached. Avoiding a gap in the content when the navbar is taken out of the flow, I've also added a placeholder, which has the same height as the navbar.
On Desktop it really works and looks how it should be. But I got a "touch" issue on mobile view. When I scroll down on mobile view the navbar will not appear during the process of scrolling over the viewpoint, where the css class is changing. It only appears when I stop scrolling after that viewpoint. When it shows up I can normally scroll up and down and I am only getting this issue again if I repeat this procedure, where the navbar has to change the css class. So it might be a problem with the css class change and I guess the problem could be in the javascript snippet. Does anybody know a solution for this? I'd like to have the same behavior like on desktop view, so the navbar is always visible and just fixed to the very top of the screen, even if it is in the flow of scrolling.
JS:
var menu = document.querySelector('#irp-localnav');
var menuPosition = menu.getBoundingClientRect();
var placeholder = document.createElement('div');
placeholder.style.width = menuPosition.width + 'px';
placeholder.style.height = menuPosition.height + 'px';
var isAdded = false;
window.addEventListener('scroll', function() {
if (window.pageYOffset >= menuPosition.top && !isAdded) {
menu.classList.add('sticky');
menu.parentNode.insertBefore(placeholder, menu);
isAdded = true;
} else if (window.pageYOffset < menuPosition.top && isAdded) {
menu.classList.remove('sticky');
menu.parentNode.removeChild(placeholder);
isAdded = false;
}
});
If you guess an error in the html/css markup, just let me know, so I get in touch with you again by posting this markup
Kind Regards
I was able to hack around. For anyone, who is facing a similiar issue:
Mobile browsers simply do not fire on a scroll event, while the event is in process. They fire when the event has stopped, so, when you've stopped scrolling. Using translate3d(0px,0px,0px) can solve this. Refer to this thread to read more about it:
iOS 9 Safari: changing an element to fixed position while scrolling won't paint until scroll stops
Kind Regards!

How can I create overlapping images that reveal themselves as you scroll

I am looking to create a scrolling effect similar to that shown here: http://www.seaham-hall.co.uk/
However I am unable to achieve the desired effect, and inspecting the sites code gives me no hints. Quite difficult to google for as it is also quite difficult to describe. The closest I can get to finding a solution is this JSFiddle:
http://jsfiddle.net/xtyus/1/
(function($){
/* Store the original positions */
var d1 = $('.one');
var d1orgtop = d1.position().top;
var d2 = $('.two');
var d2orgtop = d2.position().top;
var d3 = $('.three');
var d3orgtop = d3.position().top;
var d4 = $('.four');
var d4orgtop = d4.position().top;
/* respond to the scroll event */
$(window).scroll(function(){
/* get the current scroll position */
var st = $(window).scrollTop();
/* change classes based on section positions */
if (st >= d1orgtop) {
d1.addClass('latched');
} else {
d1.removeClass('latched');
}
if (st >= d2orgtop) {
d2.addClass('latched');
} else {
d2.removeClass('latched');
}
if (st >= d3orgtop) {
d3.addClass('latched');
} else {
d3.removeClass('latched');
}
if (st >= d4orgtop) {
d4.addClass('latched');
} else {
d4.removeClass('latched');
}
});
})(window.jQuery);
However I am not sure that is going in the right direction, this pulls images up and covers the previous image, but notice on the Seaham Hall site the images don't appear to move up at all, they are stationary and become revealed as you scroll.
How do I recreate this effect? My initial thought was to have the first image shrink as you scroll from 1000px down to 0px, and the second image grow to 1000px, and as you continue to scroll this image then shrinks and the third grows, and so on. However this means that after the first image all the other images have a starting size of 0px and there would technically be no scrolling on the page to begin with, so that is an issue.
My second thought is that perhaps the second image is fixed to the page, the first image slides up revealing the second as you scroll, the second image would not appear to move. Once the first image has gone off the top of the page the second image is detached from the page and allowed to move up with scrolling, while the third image is attached and revealed as the second moves up, this would give the exact effect seen in the Seaham website but I have no clue of it is the correct answer.
If anyone can point me to tutorials or a JSFiddle with a basic concept I can probably figure it out from there. Just stumped what direction to approach this from.
That's a nice effect. Here's one way to do it.
Put each image in a fixed position div, which takes up the entire viewport (initially) and has overflow:hidden.
Set each div's z-index to be higher than the next div's.
As the window scrolls, adjust the height of the divs as a function of the window height times the div's position (index) in the DOM, minus the window's scrollTop:
$(window).scroll(function() {
$('.D').each(function(index) {
$(this).css({
height: $(window).height()*(index+1) - $(window).scrollTop()
});
});
});
Additional content will need a higher z-index than the image divs. And note that z-index works with positioned elements only.
Fiddle
Your desired effect isn't technically a parallax background, but it's close enough that parallax jQuery frameworks should work for you.
I would suggest you research jQuery Parallax plugins as they'll likely provide the functionality you'd like without much custom work. Of course since you're dealing with large images it's also best to keep an eye on the resource management; a good plugin should be fairly efficient but others may be slow or resource intensive.
Check this jquery plugin:ScrollMagic
usage: taken from github
The basic ScrollMagic design pattern is one controller, which has several scenes attached.
Each scene has a definite start and end position and defines what happens when the container is scrolled to the specific offset.
/*
Basic workflow example
*/
// init controller
var controller = new ScrollMagic();
// assign handler "scene" and add it to controller
var scene = new ScrollScene({duration: 100})
.setPin("#my-sticky-element") // pins the element for a scroll distance of 100px
.addTo(controller); // add scene to controller
// adding multiple scenes at once
var scene2 = new ScrollScene();
var scene3;
controller.addScene([
scene2,
scene3 = new ScrollScene({duration: 200}), // add scene and assign handler "scene2"
new ScrollScene({offset: 20}) // add anonymous scene
]);

How can I make a content div slide over the header div as I scroll?

An example, http://www.laravel.com
I want to mimic this effect. I've seen it used a lot across the web lately, but I've never seen a tutorial covering how to create it.
Anyone happen to have some instructions or perhaps a tutorial on recreating this effect?
It's called parallax scrolling. You can do such things with skrollr.js.
And a great tutorial
There are plenty of examples and tutorials for sticky headers,
First link on google search for sticky header http://codepen.io/senff/pen/ayGvD
// Create a clone of the menu, right next to original.
$('.menu').addClass('original').clone().insertAfter('.menu').addClass('cloned').css('position','fixed').css('top','0').css('margin-top','0').css('z-index','500').removeClass('original').hide();
scrollIntervalID = setInterval(stickIt, 10);
function stickIt() {
var orgElementPos = $('.original').offset();
orgElementTop = orgElementPos.top;
if ($(window).scrollTop() >= (orgElementTop)) {
// scrolled past the original position; now only show the cloned, sticky element.
// Cloned element should always have same left position and width as original element.
orgElement = $('.original');
coordsOrgElement = orgElement.offset();
leftOrgElement = coordsOrgElement.left;
widthOrgElement = orgElement.width();
$('.cloned').css('left',leftOrgElement+'px').css('top',0).css('width',widthOrgElement+'px').show();
$('.original').css('visibility','hidden');
} else {
// not scrolled past the menu; only show the original menu.
$('.cloned').hide();
$('.original').css('visibility','visible');
}
}

Jquery change div based on another div's position

Let me start of by saying, I'm just now learning JS and Jquery, so my knowledge is very limited.
I've been looking around for 2 days now, and tried all sorts of combinations. But I just can't get this to work.
Below is an example of the layout
I'm looking for a way to trigger an event when div 1 is X px from the top of the screen. Or when div 1 collides with div 2.
What I'm trying to accomplish is to change the css of div 2 (the fixed menu) when div 1 is (in this case) 100px from the top of screen (browser window). Alternatively, when div1 passes div2 (I'm using responsive design, so the fixed height from top might become a problem on smaller screens right? Seeing as the header for example won't be there on a hand held.). So maybe collision detection is better here? Would really appreciate some thoughts and input on this matter.
Another issue is, div2 has to revert back to is previous css once div1 passes it (going back (beyond the 100px)).
This is what I have but it has no effect
$(document).ready(function() {
var content = $('#div1');
var top = $('#div2');
$(window).on('scroll', function() {
if(content.offset().top <= 100) {
top.css({'opacity': 0.8});
}else{
top.css({'opacity': 1});
}
});
});
I am not sure of the reason but $("#content").offset().top was giving a constant value on console. So I added window.scrollTOp() to check its distance from top, here is how it works,
$(document).ready(function() {
var top = $("#menu");
$(window).on('scroll', function(){
if(($('#content').offset().top - $(window).scrollTop()) <= 100){
top.css({'opacity': 0.4});
}else{
top.css({'opacity': 1});
}
});
});
And DEMO JSFIDDLE....

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