I'm making a simple image slider for the landing page of a website. There are two effects taking place. First, the image transitions by fading the current one in and the subsequent one out, using setInterval. There are also arrow buttons that, when clicked, slide the images forward or backward. The fading is working just fine, but the sliding functions are leaving the images in the offscreen position. Here are:
function slidePrevPic(dur){
var currentPic = $('.active-pic');
var prevPic = currentPic.prev();
if(prevPic.length == 0){
prevPic = $('#pics img').last();
}
$('.arrow').css('pointer-events','none');
setTimeout(function(){
$('.arrow').css('pointer-events','auto');
},dur);
w = $(window).width();
prevPic.css('opacity',.4);
prevPic.css('left',-w);
prevPic.animate({
'left': 0
}, dur);
currentPic.animate({
'left': w
}, dur);
setTimeout(function(){
currentPic.css('left',0);
currentPic.css('opacity',0);
},dur);
prevPic.addClass('active-pic');
currentPic.removeClass('active-pic');
};
function slideNextPic(dur){
var currentPic = $('.active-pic');
var nextPic = currentPic.next();
if(nextPic.length == 0){
nextPic = $('#pics img').first();
}
$('.arrow').css('pointer-events','none');
setTimeout(function(){
$('.arrow').css('pointer-events','auto');
},dur);
w = $(window).width();
nextPic.css('opacity',.4);
nextPic.css('left',w);
nextPic.animate({
'left':0
},dur);
currentPic.animate({
'left':-w
},dur);
setTimeout(function(){
currentPic.css('left',0);
currentPic.css('opacity',0);
},dur);
nextPic.addClass('active-pic');
currentPic.removeClass('active-pic');
};
I was trying to simplify everything to figure out what was wrong, so instead of hiding and showing images or fading them in and out, I'm just animating and setting the opacity. The idea here is pretty simple. All of the pictures are in the same place and all but one have 0 opacity. When the slider is called, the next image is moved offscreen, the current and next image are animated together (moving the current image offscreen), then the position of the current image should be reset. The sliding effect is working well, but the position of the current image is not reset, so that when it cycles back the image space goes white. I am still generally confused about how the timing of function execution with jquery and js is managed, so any help in that general direction is also much appreciated. Also, here is the code that calls these functions:
var picInterval = setInterval(function(){
fadeNextPic(picFadeTime);
},idleTime);
$('#banner #right-arrow').click(function(){
clearInterval(picInterval);
slideNextPic(picSlideTime);
picInterval = setInterval(function(){
fadeNextPic(picFadeTime);
},idleTime);
});
$('#banner #left-arrow').click(function(){
clearInterval(picInterval);
slidePrevPic(picSlideTime);
picInterval = setInterval(function(){
fadeNextPic(picFadeTime);
},idleTime);
});
Related
I'm having a issue with the website I'm creating. The truck image at the top is changing on scroll down, but while scrolling and changing the images there appears black space.
1) Images are 1400x600 JPG's, around 70kb each. I didn't lower the resolution because if someone accesses it from a 1920x1080 screen, the truck will be blurry and distorted.
2) The website is still not done, so it's on a free hosting now (000webhost.com), may this cause the images to load slower and the black space to appear?
Here is the website: http://denea.comeze.com/
Here's the script that changes the images, just in case:
var numberofscroll = 0;
var lastScrollTop = 0;
$(document).ready(function () {
var numberofscroll = 1;
var lastScrollTop = 0;
var totalImages = 4;
var dontHandle = false;
$("#home").scroll(function () {
if (dontHandle) return; // Debounce this function.
dontHandle = true;
var scrollTop = $(this).scrollTop();
(scrollTop > lastScrollTop) ? numberofscroll++ : numberofscroll--;
if (numberofscroll > totalImages) numberofscroll = totalImages;
else if (numberofscroll < 1) numberofscroll = 1;
change_background(numberofscroll);
lastScrollTop = scrollTop;
window.setTimeout(function() {
dontHandle = false;
}, 150); // Debounce!--let this handler run once every 400 milliseconds.
});
function change_background(num) {
$("#home").css("backgroundImage", "url('images/movie_" + num + ".jpg')");
};
});
Your Problem has to do with loading time.
Instead of loading the image, when the scroll begins, you can have the images you need already loaded in your page, that way you do not have any loading times, when swapping.
In HTML you have something like this:
<div class="headimg_container>
<img id="image_1" class="headimg" style="display: none" src=".......">
<img id="image_2" class="headimg" style="display: none" src=".......">
<img id="image_3" class="headimg" style="display:block" src"......">
</div>
I used headimg_container as a container element. The class should have a definitve height, so when hiding and showing your images, the container does not collapse.
And in JS you can do something like this:
function change_background(num) {
$(".headimg").hide();
$("#image_" + num).show();
};
The result would be smooth, since you can just swap the visibility of the image-tags, without any delay.
Another solution could be to use sprites, but with a few heavy images, you might want to stick with loading them separately as I suggested above.
Hope that helps!
I need to use Slider Revolution to animate content when the slider is scrolled into view. I already have working solution - http://www.themepunch.com/faq/start-animations-when-slider-scrolls-into-view/ but it has one serious bug.
When user already seen slider it start to animate again when user scrolling it again.
I want to make slide not to re-animate when user scroll to it after he already seen it.
Clarification: user scrolls down to slide - slide start to animate - (super!) - user go down to the end of the page - then go back - and slider start to animate from the beginning (bad (for me)). I want to make slider stop after he played the animation for first time.
Update with relevant code:
var win, slider, sliderHeight, sliderPaused = true, winHeight,
// Change the "revapi6" part here to whatever "revapi" name that your slider uses
slider = revapi6.on('revolution.slide.onloaded', function() {
win = jQuery(window).on('scroll', checkScroll).on('resize', sizer);
sizer();
});
function sizer() {
sliderHeight = slider.height();
winHeight = win.height();
checkScroll();
}
function checkScroll() {
var scrTop = win.scrollTop(),
offset = slider.offset().top;
if(offset <= scrTop + winHeight && offset + sliderHeight >= scrTop) {
if(sliderPaused) slider.revshowslide(2);
sliderPaused = false;
}
else {
if(!sliderPaused) slider.revshowslide(1);
sliderPaused = true;
}
}
It's in "Custom JavaScript" block in my slider settings. All just like here - http://www.themepunch.com/faq/start-animations-when-slider-scrolls-into-view/.
Site - uhhu.net
Resolve. Maybe it's not the best way, but it works and i don't know better
Comment this part
/*else {
if(!sliderPaused) slider.revshowslide(1);
sliderPaused = true;
}*/
I let you here my solution:
1- Go to Slider Revolution:
2- Select your slider:
3- Click on Slider Settings Tab:
4- In the right panel click on "Parallax and 3D" and compare with your current configuration:
5- In the right panel click on "Scroll Effects"(bellow of "Parallax and 3D") and compare with your current configuration:
6- To finish Save the configurations:
I'm developing a Fez-based HTML5 Canvas game using EaselJS and I've found a problem, that I can't solve myself, while trying to implement SpriteSheets to the hero.
The problem is that I've defined three animations to my hero ("stand", "jump" and "run") and when I try to change from one animation to another using hero.gotoAndPlay("run") or hero.gotoAndStop("stand") the animations don't change, change but show the first frame only or change to the wrong animation.
Can someone help me? What I'm doing wrong and how can I fix it? Thanks.
Here's the relevant JavaScript code I'm using to create the hero Sprite:
var data = {
images: ["http://i.imgur.com/M0GmFnz.png"],
frames: {width:34, height:46},
animations: {
stand:0,
run:[0,12,true,0.25],
jump:13
}
};
var spriteSheet = new createjs.SpriteSheet(data);
var hero = new createjs.Sprite(spriteSheet, "stand");
hero.offset = 4 + 1; // "+1" is important, change the first number only.
hero.regX = hero.offset + 2;
hero.regY = hero.offset;
hero.width = 34 - (hero.offset*2) - 12;
hero.height = 46 - (hero.offset*2);
hero.x = 0;
hero.y = 0;
hero.jumping = true;
stage.addChild(hero);
And the code I'm using to change the animation:
if(!left && !right){ // User isn't pressing left arrow or right arrow
hero.gotoAndStop("stand");
}else{
hero.gotoAndPlay("run");
}
JSFiddle
Official Site
If you are calling gotoAndStop or gotoAndPlay in a tick (or similar) then it will constantly reset to the first frame. You have to ensure you only call these functions one time when the animation changes.
A good way to set this up is to store the current animation, store it, and only change it up if the animation changes. Something like:
var animation;
if(!left && !right){ // User isn't pressing left arrow or right arrow
animation = "stand";
}else{
animation = "run";
}
if (currentAnimation != animation) {
hero.gotoAndStop(animation);
}
This is just an example, but should give you an idea. You should only call these methods one time to kick off an animation.
I had an idea for like a bus window as a fixed frame, about 800px wide, with a parallax city with the content on billboards spaced out so when you scroll between them it allows the parallax to look like bus is moving. The content will be much bigger than the window like a sprite and I'll put forward and back buttons that will scrollBy (x amount, 0). I have a working parallax script and a rough cityscape of 3 layers that all work fine.
I have hit a wall. I am trying to clear a scrollBy animation after it scrolls 1000px. Then you click it again and it goes another 1000px. This is my function.
function scrollForward() {
window.scrollBy(5,0);
scrollLoop = setInterval('scrollForward()',10);
}
So far I can only clear it when it gets to 1000. I tried doing 1000 || 2000 ect but after the first one it goes really fast and won't clear.
Excelsior https://stackoverflow.com/users/66580/majid-fouladpour wrote a great piece of code for someone else with a different question. It wasn't quite right for what the other guy wanted but it is perfect for me.
function scrollForward() {
var scrolledSoFar = 0;
var scrollStep = 75;
var scrollEnd = 1000;
var timerID = setInterval(function() {
window.scrollBy(scrollStep, 0);
scrolledSoFar += scrollStep;
if( scrolledSoFar >= scrollEnd ) clearInterval(timerID);
}, 10);
}
function scrollBack() {
var scrolledSoFar = 0;
var scrollStep = -75;
var scrollEnd = -1000;
var timerID = setInterval(function() {
window.scrollBy(scrollStep, 0);
scrolledSoFar += scrollStep;
if( scrolledSoFar <= scrollEnd ) clearInterval(timerID);
}, 10);
}
Now for step two figuring out how to put this content animation behind a frame.
Not quite sure what your asking here. Perhaps you could provide more relevant code?
I do see a potential issue with your code. You call setInterval('scrollForward()', 10) which will cause scrollForward to be called every 10ms. However, each of those calls to scrollForward will create more intervals to scrollForward creating a sort of explosion of recursion. You probably want to use setTimeout or create your interval outside of this function.
Also, as an aside you can change your code to simply: setInterval(scrollForward, 10). Removing the quotes and the parens makes it a littler easier to read and manager. You can even put complex, lambda functions like:
setInterval(function() {
scrollForward();
// do something else
}, 10);
edit:
So if you know that scrollForward moves the item 10px, and you want it to stop after it moves the item 1000px, then you simply need to stop it has moved that much. I still don't know how your code is actually structured, but it might look something like the following:
(function() {
var moved_by = 0;
var interval = null;
var scrollForward = function() {
// move by 10px
moved_by += 10;
if (moved_by === 1000 && interval !== null) {
clearInterval(interval);
}
};
var interval = setInterval(scrollForward, 10);
})();
If you want to clear it after 1000 or 2000, you simply adjust the if statement accordingly. I hope that helps.
I'm trying to implement the marquee tag in jQuery by animation a set of images using animate() function, making them move to the right or left direction.
But, I couldn't figure out when a single image goes to the end of the screen returns individually to the other side.
Because I heard that the window size is not constant for every browser, So is there anyway to implement that?
this is what I came up so far(it's simple and basic):
$(document).ready(function(){
moveThumbs(500);
function moveThumbs(speed){
$('.thumbnails').animate({
right:"+=150"
}, speed);
setTimeout(moveThumbs, speed);
}
});
note: I searched in SO for related questions, but had no luck to find exact information for my specific issue.
Here's a basic script that moves an image across the screen and then resumes on the other side and adapts to the window width.
You can see it working here: http://jsfiddle.net/jfriend00/rnWa2/
function startMoving(img) {
var img$ = $(img);
var imgWidth = img$.width();
var screenWidth = $(window).width();
var amount = screenWidth - (parseInt(img$.css("left"), 10) || 0);
// if already past right edge, reset to
// just left of left edge
if (amount <=0 ) {
img$.css("left", -imgWidth);
amount = screenWidth + imgWidth;
}
var moveRate = 300; // pixels per second to move
var time = amount * 1000 / moveRate;
img$.stop(true)
.animate({left: "+=" + amount}, time, "linear", function() {
// when animation finishes, start over
startMoving(this);
})
}
$(document).ready(function() {
// readjust if window changes size
$(window).resize(function() {
$(".mover").each(function() {
startMoving(this);
});
});
});