Develop Reference

Catch CSS value before mouse leaves

I'd like to get the current value of my transform: rotate, just before the mouse leaves. In the current state, the event seems to be caught when the mouse has already left my button and returns 0deg which is true at this moment.
My point is to play the same animation in reverse mode. For that, I need to get the current value of the rotation and make a transition from Xdeg to 0deg. I firstly tried to accomplish it in full CSS but the animation is suddenly broken when mouse leaves. I also tried to play another animation when the mouse is not on the button but the result is not as clean as I expected since it begins from a predefined value and not the current rotate value.
You can find my fiddle here : https://jsfiddle.net/yn460w6j/
Thanks to #lakenen for the degree function, btw !

I little play with that, use only js to solve this. I'm adding class to spinner when mouseover on button. Next, when mouseleave I am setting listener on stop animation iteration. When it complete I just remove animation class from spinner.
var $spinner = $("#random_glyph");
var $button = $("#random_button");
$button.on("mouseover", function() {
$spinner.addClass('animation');
});
$button.on("mouseleave", function() {
$button.bind("webkitAnimationIteration, mozAnimationIteration, animationiteration", function(e){
$spinner.removeClass('animation');
$(this).unbind(e);
});
});
https://jsfiddle.net/9jLstovx/

fadeTo breaks smooth scroll

I'm using this snippet I found online to smooth scroll:
$( "a[href*='#']" ).on( "click", function( event ) {
event.preventDefault();
var href = event.target.href;
href = href.slice( href.indexOf( "#" ), href.length );
$( "body" ).animate( {
scrollTop: $( href ).get( 0 ).offsetTop
}, 1000 );
} );
It works just fine but it breaks when it comes across an image that is fading in. I have some images set to fadeTo from opacity 0 to 1 and when the scroll animation comes across those images it stops dead in it's tracks. In other words, the smooth scroll always stops at my first div because there are images fading in that stop the scroll so the scroll animation never takes the user to their desired destination.
How can I remedy this?

The janky-ness you're seeing is due to the extra rendering required to update the opacity of the images during the scroll, versus the scroll alone.
I'd suggest your best bet would be to disable the fade whilst the scroll is occurring.
To do this you could either set opacity to 1 for all images before calling animate(), or to prevent the fade from occurring until after the animation is complete, however the method to do this would depend on the code/framework used for the image fade.

JQuery animate firing late in Chrome

I have an image sprite which, on mouseenter, changes the background position and moves text over. On mouse leave, the background position and text both move to the left to display the original image. The text is a seperate element which comes from the right to sit over the image once the position has changed.
The mouseenter part works perfectly, with the image and text both scrolling to the left at the same time, but on mouseleave, however in chrome (and what appears to be only chrome), the text will move first, then the image will follow later, the image animation is firing much later than the text.
I've read a few issues with .animate() in chrome, but none of the issues seem to be related to this.
Is there anything obviously wrong with this? Or is there simply a better way of doing it
//animation on mouse enter
$("#featuredImage").mouseenter(function(){
$(this).animate({ backgroundPositionX:"100%" });
$("#featuredText").show("slide", { direction: "right" });
});
//animation on mouse leave
$("#featuredImage").mouseleave(function(){
$(this).animate({ backgroundPositionX:"0%" });
$("#featuredText").hide("slide", { direction: "right" });
});

Try hover see If this helps :
$("#featuredImage").hover(function(){
$(this).animate({ backgroundPositionX:"100%"});
$("#featuredText").show("slide" ,{ direction: "right"});
},function(){
$(this).animate({ backgroundPositionX:"0%" });
$("#featuredText").hide("slide",{ direction: "right" });
}
);

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

jQuery's stop() seems to be blocking animations that haven't been queued yet

How does jQuery's stop() actually work?
If you look here (http://jsfiddle.net/hWTT6/), when you hover over the main blue box it should fade to red, and when you hover off it should fade back. The problem is it will completely fade to red (and then back to blue) even if the mouse has hovered off before the first fade was complete. The problem can more clearly be seen with the slide effect. Hover over the slide "button" and the main box will slide to blue, hover off, it will slide back. But try hovering on and off and on and off, before the first animation has completed. You'll see that all four animations are carried out. I included both examples here to show it is not just a problem with one effect or something.
I thought this would be easily fixed by adding a stop before the animations, as shown commented out in the code. But, if I do this the current animation will stop and the following one will never start. Almost as though stop is blocking an animation that is occurring after the call to stop.
What am I missing here?
Thanks.

You are missing that .stop() accepts two arguments. Both boolean, indicating:
- clearQueue (first)
- jumpToEnd (second)
So by calling $('#foo').stop( true, true ).doSomeOtherStuff() you should get your desired goal.
Reference: .stop()

The problem is the CSS is getting messed up by stopping at arbitrary points.
The fadeIn(), fadeOut(), slideUp() and slideDown() move from the current state to a new one and then revert to that - not to the original CSS.
You need to fix the CSS back in to a usable state to continue with after the .stop(), or more clearly specify the animation targets.
As the others have said, you can get the CSS to the correct position, by ensuring that when you stop the animation, it jumps to the end of it, rather than leaving everything in an arbitrary state.
UPDATE:
Take a look at the code in this update of your demonstration: http://jsfiddle.net/hWTT6/5/
It might not be exactly how you want it to perform, but the trick, if you do not want the animation to run its course, is to get the animation back in to a state that it can continue from in the way in which you desire.
$(function() {
$('#fade')
.mouseenter(function() {
$('#fg_fade').stop().animate({ 'opacity': 0 }, 'slow', function() {
$('#fg_fade').css('height', '100%');
});
})
.mouseleave(function() {
$('#fg_fade').stop().animate({ 'opacity': 1, 'height': '100%' }, 'slow');
});
$('#slide_fire')
.mouseenter(function() {
$('#fg_fade').stop().animate({ 'height': 0 }, 'slow', function() {
$('#fg_fade').css('opacity', 1);
});
})
.mouseleave(function() {
$('#fg_fade').stop().animate({ 'height': '100%' }, 'slow', function() {
$('#fg_fade').css('opacity', 1);
});
});
});

You could set the stop() options to (true, true) so that you cancel all events in cue and jump to the end of the previous animation. look at the fiddle:http://jsfiddle.net/hWTT6/4/

The stop method can be called in the following difference ways:
.stop(true);
//Same as:
.stop(true, false); //Empty the animation queue only
//Or
.stop(true,true); // Empties the animation queue AND jumps to the end
//Default
.stop()
//Same as
.stop(false,false);
There may be a better way using .animate instead: Demo Here
$(function() {
$('#fade')
.mouseenter(function() {
$('#fg_fade').stop().css('height', '10em').animate({'opacity' : '0'}, 'slow');
})
.mouseleave(function() {
$('#fg_fade').stop().css('height', '10em').animate({'opacity' : '1'}, 'slow');
});
$('#slide_fire')
.mouseenter(function() {
$('#fg_fade').stop().css('opacity', '1').animate({'height' : '0'}, 'slow');
})
.mouseleave(function() {
$('#fg_fade').stop().css('opacity', '1').animate({'height' : '10em'}, 'slow');
});
});
This way the animation stops when you want it to and still runs the next animation.
The problem with doing .stop then slideUp/slideDown or fadeIn/fadeOut is that the animation can end prematurely and keep an incorrect height/opacity.

The problem is caused by the way fadeIn, fadeOut etc. work. You may expect them to fade between 0 and 1. However, in reality they fade between 0 and whatever the "baseline" opacity is. You can see this here:
http://jsfiddle.net/hWTT6/7/
You'll notice I set the initial opacity to .5. Now when I call fadeIn it does not fade all the way in to 1 it fades to my baseline of .5. Your problem occurs when you stop the animation prematurely, the "baseline" becomes whatever the opacity is at the time it is stopped. Now when you call fadeIn on mouseleave it tries to fade to this new baseline and finds it is already there. You can see this illustrated by going here:
http://jsfiddle.net/hWTT6/8/ (original, but with .stop)
If you place your mouse over slide and then remove it half-way through the animation, it will stop in the middle. Now place your mouse back over slide and wait for the animation to complete. If you now remove your mouse, you will see that it slides back down to the place where the first animation was stopped. That is because this is the new "baseline".
The way that you would solve this is actually to replace fadeIn, fadeOut, etc. with a more explicit animation. For instance, use fadeTo to tell it to fade between 0 and 1:
http://jsfiddle.net/hWTT6/6/
Notice that since I am telling it to fade to 0 or 1 everything works. A similar thing could be done to replace slideUp and slideDown using animate.