Develop Reference

Swiper Scroll to Top slide with customscrollbar

I lost a few days trying to make top position in view on other slide than active slide. I use plugin: idangero.us/swiper/. However, didn't work when I join above plugin with malihu.plugin and I dont know what I'm doing wrong.. PLEASE help me, anbody...
If I use only idangero.plugin then everythink work: fiddle but after join next plugin scrollbar no working scroll to top on (other than active) slides.
How I can join both plugin?
In malihu plugi part of code responsible for srolling:
_wrapperScroll=function(){
var $this=$(this),d=$this.data(pluginPfx),
namespace=pluginPfx+"_"+d.idx,
wrapper=$("#mCSB_"+d.idx+"_container").parent();
wrapper.bind("scroll."+namespace,function(e){
if(wrapper.scrollTop()!==0 || wrapper.scrollLeft()!==0){
$(".mCSB_"+d.idx+"_scrollbar").css("visibility","hidden"); /* hide scrollbar(s) */
}
});
},
In dev show code in browser (ff) I can see:
mCSB_scrollTools mCSB_3_scrollbar (...) mCSB_scrollTools_vertical
Where:
mCSB_X_scrollbar
is propably equal X malihu scrollbar in X slide.
X is number of slide and scrollbar
So what should I edit/do to make it work and where paste it in idangero plugin
I realy need to your help with that...
best regards

Since you're using custom scrollbar on the slides, you need to use the script's API to control it. The mCustomScrollbar plugin defines a scrollTo method, which is available on the element you attached the scrollbar to.
If you want to reset scrollbar position on all slides in the slider except current slide, inside the onSlideChangeEnd callback call
$(hook.slides).not(':eq(' + hook.activeIndex + ')').mCustomScrollbar('scrollTo', 0);

Hide navigation bar on scroll with animation Titanium

Some apps (facebook, 9gag) have this functionality. When the user scrolls up the navigation bar gradually hides itself to a point where vanishes. Then when the user scrolls down the navigationBar gradually shows itself (depending on the speed of the scroll).
We tried to implement this on Titanium by adjusting the height of the nav view on the scroll event, but it is lagged and very slow:
scrollView.addEventListener('touchstart',function(e){
boolScroll=true;
});
scrollView.addEventListener('scroll',function(e){
if(boolScroll){
auxScroll=e.y;
boolScroll=false;
}
var bh=bars.height;
var sh=scrolls.height;
if(auxScroll<e.y)//scrolling down
if(bars.height>appHeight*0.08){
bars.height=bh-appHeight*0.005; //rate for hiding
if(scrolls.height<appHeight*0.7)
scrolls.height=sh+appHeight*0.005;//same rate to increase the height of the scroll
}
if(auxScroll>e.y)//scrolling up
if(bars.height<appHeight*0.08){
bars.height=bh+appHeight*0.005;
if(scrolls.height>appHeight*0.7)
scrolls.height=sh-appHeight*0.005;
}
});
We also tried doing it with translate animation on the view, but is still slow.
There is a solution for iOS on this question. Any help would be appreciated!

Don't know if you solved this problem but I did a trick that's working well for me ( at least for the navigation bar )
Here's the snippet :
self.addEventListener('scroll',function(e){
if(e.contentOffset.y > 20) NavigationWindow.window.hideNavBar();
if(e.contentOffset.y < 20) NavigationWindow.window.showNavBar();
});
NavigationWindow is an instance of Ti.UI.iOS.createNavigationWindow, self can be a tableview,view,scrollview or a window ( in my example )

this is actually a really nice feature to have. Appcelerator just tackled it and should be available on release 6.0 according to this ticket: https://jira.appcelerator.org/browse/TIMOB-23684

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!

Content flicker/jump on infinite scroll/loop

I am looking for help / a point in the right direction / or a solution for a flicker/jump, when scrolling on a looping/infinite website, which can be seen in this fiddle.
What seems to be causing the jump is:
"$(window).scrollTop(half_way - child_height);", and what could also be a Chrome windows scrollTop bug, but it is happening in all browsers at the moment.
If I remove "- child_height" there is no longer a flicker but the page no longer scrolls correctly, which can be seen in this fiddle.
Also, on the very first scroll the right hand column jumps up by three boxes - also because of 'half_way', which I can fix by giving it a "bottom: -600px;"
The full code:
http://jsfiddle.net/djsbaker/j3d8r/1/
var num_children = $('#up-left').children().length;
var child_height = $('#up-left').height() / num_children;
var half_way = num_children * child_height / 2;
$(window).scrollTop(half_way);
function crisscross() {
$('#up-left').css('bottom', '-' + window.scrollY + 'px');
$('#down-right').css('bottom', '-' + window.scrollY + 'px');
var firstLeft = $('#up-left').children().first();
var lastLeft = $('#up-left').children().last();
var lastRight = $('#down-right').children().last();
var firstRight = $('#down-right').children().first();
if (window.scrollY > half_way ) {
$(window).scrollTop(half_way - child_height);
lastRight.appendTo('#up-left');
firstLeft.prependTo('#down-right');
} else if (window.scrollY < half_way - child_height) {
$(window).scrollTop(half_way);
lastLeft.appendTo('#down-right');
firstRight.prependTo('#up-left');
}
}
$(window).scroll(crisscross);

Okay - here is a 'working' version - and by works I mean it less flickery than before. I thought it was flicker free, and it was when I was on battery power, but plugged into the mains and the CPU is fast enough to get flicker.
As I mentioned, to get rid of the flicker you need to clone the objects, manipulate them and then replace them into the DOM, rather than just manipulating the DOM directly.
I did this by getting the contents of <div id="content"> manipulating them and then replacing them into that <div>.
Also, it's a good idea to only find things in the DOM once, and from then on use a reference to that object rather than searching repeatedly. e.g.
var leftSide = $(clone).find('.up-left');
....
lastRight.appendTo(leftSide);
....
$(leftSide).css('bottom', '-' + window.scrollY + 'px');
rather than:
lastRight.appendTo('#up-left');
$('#up-left').css('bottom', '-' + window.scrollY + 'px');
Searching the DOM is relatively slow, and so storing references can improve performance/reduce flicker.
Storing the object also makes the code easier to understand (imho) as you can easily see that you're referencing the same thing, rather than possibly different things.

I still get flickering in chrome on windows with Danack solution. For this site I would control all the scrolling (you already scroll manually one of the sides), and give elements absolute positions.
Or if you insist on using the browser scrolling, may be use animations: animate the height of the last elements till 0px then use appendTo, and then animato from 0px to the normal height...

This might be a long shot, but I had the same flickering when working with infinitescroll,
and ended up using imagesLoaded.I ended up appending the additional images (now loaded) with a fade in, and that prevented them from flickering because of the fact they were loaded.
So maybe by using the imagesloaded - or a callback on the images, you can solve the flickering. It does decrease the speed though. I can image that if you want to scroll through everything as fast as possible, this might not be the solution. Good luck!

A solution would be to not use the native scrolling functionality but to simulate scrolling. This would be done by setting the overflow of your content to "hidden" in addition with capturing the "mousewheel" event on it and triggering some action when it is called. I started to try this out here (using MooTools instead of jQuery since I'm more fimilar with it). It's currently just "working" on the left side by altering the margin-top of the first element.
My next steps would be:
Check if the negative margin-top of the first element is bigger than the height of it and move it to the right side if so.
Same logic for the last box on the right side with a negative margin-bottom.
This has some downsides, though. Simulating scrolling doesn't feel as natural as the native scrolling functionality and clicking the mousewheel doesn't work. These might be solveable but it would require some more coding to get it to work smoothly. Anyway, in the end you would have a solution without any flickering and with no sticky scrollbar at the side (An idea for a replacement could be a small area on the side that triggers the scrolling on mouseover).

How to solve element flicker while scrolling with parallax effect in JavaScript?

I am trying to re-create website with parallax effect using JavaScript. That means that I have two or more layers, that are moving different speeds while scrolling.
In my case I'm moving only one layer, the other one remains static:
layer 1 = website text;
layer 2 = element background;
for this I'm using simple source code (with jQuery 1.6.4):
var docwindow = $(window);
function newpos(pos, adjust, ratio){
return ((pos - adjust) * ratio) + "px";
}
function move(){
var pos = docwindow.scrollTop();
element.css({'top' : newpos(pos, 0, 0.5)});
}
$(window).scroll(function(){
move();
});
The Problem:
- All calculations are done right and the effect "works" as expected. But there is some performance glitch under some browsers (Chrome MAC/Windows, Opera MAC, IE, paradoxically not Safari).
What do I see during scrolling?
- While scrolling the background moves in one direction together with scroll, but it seems to occasionally jump few pixels back and then forth, which creates very disturbing effect (not fluid).
Solutions that I tried:
- adding a timer to limit scroll events
- using .animate() method with short duration instead of .css() method.
I've also observed, that the animation is smooth when using .scrollTo method (scrollTo jQuery plugin). So I suspect that there is something wrong with firing scroll events (too fast).
Have you observed the same behavior?
Do you know, how to fix it?
Can you post a better solution?
Thanks for all responses
EDIT #1:
Here you can find jsfiddle demonstration (with timer): http://jsfiddle.net/4h9Ye/1/

I think you should be using scrollTop() instead and change the background position to fixed. The problem is that setting it to absolute will make it move by default when you scroll up or down.
The flicker occurs because the position is updated as part of the default browser scroll and updated again as part of your script. This will render both positions instead of just the one you want. With fixed, the background will never move unless you tell it so.
I've created a demo for you at http://jsfiddle.net/4h9Ye/2/ .