Develop Reference

Hard Javascript/jQuery Animation (Spinner/Scroller)

Okay, I'm trying to make it so when you click a button it'll spin a div with it's randomized contents and it'll slow down on stop on a specified div, now I have no idea where to start,
Here is an example of what I'm trying to do,
https://www.youtube.com/watch?v=y7jjhLUKleg
Any idea how to start? what should my priority be, jQuery or Javascript?
Kind Regards
EDIT: I'm not asking for anyone to spoonfeed me code, I just need an idea on where to start.

The animation itself can be probably solved easily using JQuery Animate functions. The animation supports easing, and the "ease out" is what you need. With some CSS, you would create some kind of viewport, and move the elements from right to left until the animation stops.
Let me help you with some starting code: http://jsfiddle.net/dfevruws/1/
The animation command is very simple:
$(function() {
$( "#items" ).animate({
left: -2000
}, {
duration: 5000,
easing: "easeOutQuad"
});
});
Probably more interesting than this is how you handle the selected item, but this is a different story, you ask for the Animation.

Scroll snapping to a page section

So I have two sections of content near the top of my page and I’d like for users who have scrolled down to near the top of the second section to get “scroll snapped” to the top of the second one once they have stopped scrolling.
I think it should be possible using jQuery but I haven’t been able to figure it out. Here are my examples:
Without my attempt: http://codepen.io/jifarris/pen/gaVgBp
With my broken attempt: http://codepen.io/jifarris/pen/gaVgQp
Basically I can’t figure out how to make it try scrolling to the spot only once, after scrolling has stopped. It’s kind of just freaking out.
I love how the recently introduced scroll snap points CSS feature handles scroll snapping and I’d almost prefer to use it – for the browsers that support it, at least – but it seems like it only works for items that take up 100% of the viewport height or width, and it seems like it’s for scrolling within an element, not the page itself.
The top section has a fixed height, so this really can be handled with pixel numbers.
And for reference, here’s the heart of the code from my attempt:
$(function() {
$(document).on('scroll', function() {
var top = $(document).scrollTop();
if (top > 255 && top < 455) {
$('html, body').animate({scrollTop: '356'}, 500);
$('body').addClass('hotzone');
} else {
$('body').removeClass('hotzone');
}
});
});

KQI's answer contains most of the steps required to create a well functioning section-scroll for use in your application/webpage.
However, if you'd just want to experiment yourself, developing your script further, the first thing you'll have to do is add a timeout handler. Otherwise your logic, and therefor scrollAnimation, will trigger every single pixel scrolled and create a buggy bouncing effect.
I have provided a working example based on your script here:
http://codepen.io/anon/pen/QjepRZ?editors=001
$(function() {
var timeout;
$(document).on('scroll', function() {
clearTimeout(timeout);
timeout = setTimeout(function() {
var top = $(document).scrollTop();
if (top > 255 && top < 455) {
$('body').animate({
scrollTop: '356'
}, 500);
$('body').addClass('hotzone');
} else {
$('body').removeClass('hotzone');
}
}, 50);
});
});
Good luck!

All right, there are couple of things you gonna have to deal with to get a good result: which are performance, call stack queue, easing.
Performance wise you should drop jQuery animate and use VelocityJs which gives a smoother transition, better frame per second (fps) to avoid screen glitches especially on mobiles.
Call stack: you should wrap whatever logic you have to animate the scrolltop with 'debounce' function, set the delay for let say 500mm and check the scrolling behavior. Just so you know, the 'scroll' listener your using is firing on each pixel change and your script will go crazy and erratic. (It is just gonna be a moment of so many calc at the same time. Debounce will fix that for you)
Easing: make the transition looks cool not just dry snappy movement.
Remember, 'easing' with Velocity starts with 'mina.' i.e.
'Mina.easingFnName'
Finally, your logic could be right, i am in my phone now cannot debug it but try to simplify it and work with a single problem at once, be like i.e.
If ( top > 380 ) // debounce(...)

Properly animate multiple elements with Jquery

Probably I didn't choose the best title for my question, sorry for that.
I'm pretty new with jQuery, hence with animations.
I'm just experimenting with It, but now I have a problem.
The script works like I want, but It seems a bit "buggy", I bet my code isn't optimized, at all... Plus I may be using a wrong way to achieve what I want.
One button is triggering the script (Its not supposed to be like that at the end, but momentarily I'm using this button to trigger the script), it works like a "toggle" and every time I click on "Show", a bunch of HTML is shown and two animations run:
$(".achievement_container").hide(300).show(); //shows the whole container
$(".glow").fadeIn(100).fadeOut(800); // First "brightening" effect
This one shows the whole "frame", while another animation runs for a lighting effect:
$(".ach_hover").css("left", "0px").css("opacity", "1").animate({
left: "252px",
opacity: "0"
}, 1100);
You can see a "working" example here:
http://jsfiddle.net/Frondor/6EA6W/
My problem appear after I click the "Show" button many times, the $(".ach_hover") animation start to fail and it doesn't appear, at all...
I'm not satisfied with the way I wrote this last animation, at least I think there might be a better and "standard" way to achieve this.
So I would really appreciate any suggestion from jQuery experts to "optimize" my script, and avoid any buggy behavior on it.
Thanks in advance

Try using jQuery .stop()
Stop the currently-running animation on the matched elements.
$(".ach_hover")
.css({
"left": "0px",
"opacity": "1"
})
.stop()
.animate({
left: "252px",
opacity: "0"
}, 1100);
Fiddle

Rapahel js : dynamic positioning and animations

I'm new to js and web dev in general, and i want to add animations to my website using raphael js.
Here is the code I use for a basic slide-in animation:
paper.text('1000','25%','this is a\ntest').animate({x: '50'}, 1000, 'linear');
(test it here)
It works fine when i put fixed values for the x parameter. However, when i use dynamic positioning, the animation doesn't occur, and the text waits for the duration of the animation before positioning itself. At least the final positioning is what i'm looking for:
paper.text('300%','25%','this is a\ntest').animate({x: '50%'}, 1000, 'linear');
Why isn't it working ?
Is there a way around ?

I'm not sure raph can work like that (animating to a percentage), I may be wrong though.
Is this the sort of thing you are after ?
paper.text( paper.width * 3,'25%','this is a\ntest').animate({x: paper.width / 2}, 1000, 'linear');

How do I stop a bouncy JQuery animation?

In a webapp I'm working on, I want to create some slider divs that will move up and down with mouseover & mouseout (respectively.) I currently have it implemented with JQuery's hover() function, by using animate() and reducing/increasing it's top css value as needed. This works fairly well, actually.
The problem is that it tends to get stuck. If you move the mouse over it (especially near the bottom), and quickly remove it, it will slide up & down continuously and won't stop until it's completed 3-5 cycles. To me, it seems that the issue might have to do with one animation starting before another is done (e.g. the two are trying to run, so they slide back and forth.)
Okay, now for the code. Here's the basic JQuery that I'm using:
$('.slider').hover(
/* mouseover */
function(){
$(this).animate({
top : '-=120'
}, 300);
},
/* mouseout*/
function(){
$(this).animate({
top : '+=120'
}, 300);
}
);
I've also recreated the behavior in a JSFiddle.
Any ideas on what's going on? :)
==EDIT== UPDATED JSFiddle

It isn't perfect, but adding .stop(true,true) will prevent most of what you are seeing.
http://jsfiddle.net/W5EsJ/18/
If you hover from bottom up quickly, it will still flicker because you are moving your mouse out of the div causing the mouseout event to fire, animating the div back down.
You can lessen the flicker by reducing the delay, however it will still be present until the delay is 0 (no animation)
Update
I thought about it and realized that there is an obvious solution to this. Hoverintent-like functionality!
http://jsfiddle.net/W5EsJ/20/
$(document).ready(function() {
var timer;
$('.slider').hover(
/* mouseover */
function(){
var self = this;
timer = setTimeout(function(){
$(self).stop(true,true).animate({
top : '-=120'
}, 300).addClass('visible');
},150)
},
/* mouseout*/
function(){
clearTimeout(timer);
$(this).filter(".visible").stop(true,true).animate({
top : '+=120'
}, 300).removeClass("visible");
}
);
});

You could use .stop() and also use the outer container position
$(document).ready(function() {
$('.slider').hover(
/* mouseover */
function(){
$(this).stop().animate({
top : $('.outer').position().top
}, 300);
},
/* mouseout*/
function(){
$(this).stop().animate({
top : $('.outer').position().top + 120
}, 300);
}
);
});
​
DEMO
Hope this helps

Couldn't reproduce your issue but I believe that hover is getting called multiple times. To work around this you can check if the div is already in animation. If yes, then don't run another animation again.
Add following piece of code to check if the div is already 'animating':
if ($(this).is(':animated')) {
return;
}
Code: http://jsfiddle.net/W5EsJ/2/
Reference:http://api.jquery.com/animated-selector/

I understand the problem and reproduced it, it happens when hovering from the bottom up. The hovering with the mouse is what's causing the problem since the animation function will be called when the mouse hovers over the image. You need to control what happens here by using mouse enter and mouse leave, check out a similar example: Jquery Animate on Hover

The reason it's like that is because the hover is getting queued up causing it to slide up and down multiple times. There's a plug-in called hoverIntent which fixes the issue. http://cherne.net/brian/resources/jquery.hoverIntent.html
If you do decide to use hoverIntent, the only thing you have to change in your code is .hover > .hoverIntent