Animate object off of screen with no lag - javascript

I've been using Animate.CSS and basic Jquery to animate elements on and off the screen. The issue is this has been creating a lot of lag due to a background slideshow occurring at the same time as the on screen animations. I've been looking into alternatives to help fix this issue.
I've read about using Opacity and TranslateZ etc to have elements come in and off of the page.
What would be the best way to change my code below to potentially lag less during animation?
//Screen 7 Start
//Highest Planned College
$( "#screen7" ).hide()
$(".buttonsQuestion7").click(function() {
$('#screen7').addClass('animated slideOutUp');
$('#screen7').fadeOut()
$( "#screen8" ).show()
$( "#screen8" ).addClass('animated slideInUp');
});

I had lag problems too with jQuery animations. The problem was lying in having several animations after one another like you have :
$('#screen7').fadeOut();
$( "#screen8" ).show();
What fixed it for me was to call the second animation in the callback of the first one like so:
$('#screen7').effect('fadeOut', {
direction: 'left',
mode: 'hide',
duration: '300',
complete: function(){
$('#screen8').show();
}
});
In this case i am using .effect() from jQuery UI but .fadeOut() has the same complete callback option
http://api.jquery.com/fadeout/
Hope that helps

Related

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.

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

AJAX loading objects/images - makes jQuery animations choppy

I am building a website that has a few animations when you load the home page (for example, the main logo and a few menus slide in from the sides of the screen). Simultaneously, I am also using AJAX in the background to start to load some images that might be viewed later. The problem with this is that when the images are loading, the animations become quite choppy. Is there any way to stop this? Or maybe give the AJAX function a lower priority so that it doesn't try to do anything when an animation is running?
Here is the current script I'm using to load these images:
$('.lightbox-container.first').load('/images/first_set/', function(){
$('.lightbox-container.second').load('/images/second_set/', function(){
$('.lightbox-container.third').load('/images/third_set/', function(){
$('.lightbox-container.fourth').load('/images/fourth_set/', function(){
$('.lightbox-container.fifth').load('/images/fifth_set/', function(){
$('.lightbox-container.sixth').load('/images/sixth_set/');
});
});
});
});
});
An all of my animation function look something like:
$('.third-section').animate({ 'opacity': '1', 'height': '200px', 'padding-top': '20px', }, 500);
The problem
Since all your ajax and js animations run on the same browser thread, you are bound to have this problems. You are reaching the limits of your CPU, which causes the choppiness.
How to solve this
Use CSS3 transforms. Those are hardware accelerated in all modern browsers and run on a separate threads, so their performance is generally not affected by ajax calls. Since you said you only slide things around, I think this would be the ideal solution for you. There is a great article about it here:
http://www.html5rocks.com/en/tutorials/speed/high-performance-animations/
Your case
So to actually make this work for you. Leave the ugly ajax calls as they are for now. Instead of using jQuery animate, you need 2 states - the initial, which positions the slide away and one with an extra class, which positions your slide in it's target place.
All you have to do is add the class to the slide and it will nicely come in place. Theory is simple.
Sample
Your initial state could be something like this:
.slide {
transform: translate(-400px, -200px);
transition: all 5s;
}
And the one to show in place:
.slide.show {
transform: translate(0px, 0px);
}

Smoothly Fade In Entire Web Page With MooTools

I want to fade in an entire web page after all its elements finished loading. The web page includes the background image repeated left to right, and the main content area with some text and pictures. I assume I should set body opacity to 0 in CSS, and use JavaScript code to fade in the page.
I have to use MooTools, more specifically, version 1.2.6, because that library is already linked to the page (and shouldn't be upgraded to a more recent version, for a number of reasons).
One of the StackOverflow experts suggested this MooTools snippet as a solution:
window.addEvent('load', function() {
$$('body').set('morph', {duration: 300}).morph({'opacity': '1'});
});
PROBLEM: for some reason, instead of smoothly fading in the page, the snippet makes the background appear right away, and then, a second or so later, the page pops up, without any fade-in effect. Most likely it's me who's not doing things right.
I'd appreciate a bit of advice from a knowledgeable person.
The answer to your question is to do the following.
Remove the CSS opacity:0; in the stylesheet and use this code adjusted from yours
I increased from 300 to 3000 which in seconds is from .3seconds to 3seconds.
chained:
window.addEvent('load', function () {
$$('body').fade('hide').set('morph', {
duration: 3000
}).morph({
'opacity': '1'
});
});
expanded:
window.addEvent('load', function () {
var el = $$('body');
el.fade('hide'); // hide body tag
el.set('morph', {duration: 3000});
$$('body').morph({'opacity': '1'});
});
Notice:
I do agree with LifeInTheGrey about bad practice, but i said i would answer your question.

Easing on Fixed Position Jquery

Is there anyway to add a easing to a fixed element?, I've been looking around and I can't find an answer. I really don't know how it would be, maybe something like...
$(window).scroll(function() {
$("#form").animate({position:"fixed", easing: 'swing'});
});
Any help will be appreciated ^ ^ Thanks!
Edit:Pretty much what I'm looking for is when user scrolls, the fixed element obviously will follow the window position, but I want to add is a little delay in comparison to scroll action with an easing effect
You'd have to make that div absolute positioned, z-indexed and without parent, then move it on the scroll event. You can know the number of pixels scrolled with scrollTop(). Something like this:
$(window).scroll(function(){
var offset=100;
//stop is called so easing doesn't affect while it is still scrolling.
$("form").stop().animate({top:($(window).scrollTop()+offset)+"px"}, 300, 'swing');
});
Try this instead:
$("#form").animate({position:"fixed"}, 300, 'swing');
From the jQuery api ( http://api.jquery.com/animate/ ):
The only easing implementations in the jQuery library are the default,
called swing, and one that progresses at a constant pace, called
linear. More easing functions are available with the use of plug-ins,
most notably the jQuery UI suite.
$("form").animate({position:"fixed"}, 300, 'swing'); //swing being default

Categories

Resources