I want to create a website with background images that change over time with a fade in/fade out effect, but I don't want to use the existing jQuery fade in/fade out effect because with when one image faded out, a white background appeared before other image faded in. I found a plugin named Maximage that suits my request but it uses img tags while I want to work with background-image CSS (I have a good reason for doing this). Does anyone know how to do this?
Here's my HTML code:
<div id="wrapper">
//My contain here
</div>
Here's my JavaScript code so far:
//Auto change Background Image over time
$(window).load(function() {
var images = ['img/top/bg-1.jpg','img/top/bg-2.jpg','img/top/bg-3.jpg'];
var i = 0;
function changeBackground() {
$('#wrapper').fadeOut(500, function(){
$('#wrapper').css('background-image', function () {
if (i >= images.length) {
i = 0;
}
return 'url(' + images[i++] + ')';
});
$('#wrapper').fadeIn(500);
})
}
changeBackground();
setInterval(changeBackground, 3000);
});
Example: http://www.aaronvanderzwan.com/maximage/examples/basic.html
AHH ! Finally ! I found a nice technique ! I'm using a double wrapper.
The problem in your code is a bit logical. You can't fadeOut and fadeIn at the same time a single wrapper.
So the idea is to create two wrapper and to switch between them back and forth. We have one wrapper called: "wrapper_top" that encapsulate the second wrapper called: "wrapper_bottom". And the magic was to put beside the second wrapper: your content.
Thus having the structure ready which is the following:
<div id='wrapper_top'>
<div id='content'>YOUR CONTENT</div>
<div id='wrapper_bottom'></div>
</div>
Then a bit of JS+CSS and voilà ! It will be dynamic with any amount of images !!!
Here is the implementation: http://jsbin.com/wisofeqetu/1/
<html>
<head>
<script src="http://code.jquery.com/jquery-1.10.2.min.js" type="text/javascript"></script>
<script type="text/javascript">
$(window).load(function() {
var i =0;
var images = ['image2.png','image3.png','image1.png'];
var image = $('#slideit');
//Initial Background image setup
image.css('background-image', 'url(image1.png)');
//Change image at regular intervals
setInterval(function(){
image.fadeOut(1000, function () {
image.css('background-image', 'url(' + images [i++] +')');
image.fadeIn(1000);
});
if(i == images.length)
i = 0;
}, 5000);
});
</script>
</head>
<body>
<div id="slideit" style="width:700px;height:391px;">
</div>
</body>
</html>
If it doesn't have to be background-image, you can place all the images in your #wrapper, in <img>, it will work like a charm:
<div id="wrapper">
<img src="firstImage" class="imageClass"></img>
<img src="secoundImage" class="imageClass"></img>
<img src="thirdImage" class="imageClass"></img>
</div>
then some style. Every image has to be in same spot, so add position relative to #wrapper, and position absolute to .imageClass:
#wrapper{
position: relative;
}
.imageClass{
position: absolute;
top: 0;
left: 0;
display: none;
}
display: none; will hide every image.
Now some JQuery. To appear first image when window load write this:
$(window).load(function() {
$('.imageClass').eq(0).show();
});
by the .eq() "command" you can specify which one element with class '.imageClass' you want to use exactly. Starts with 0. After that just do something like that:
function changeBackground() {
var current = 0;
//tells which image is currently shown
if(current<$('.imageClass').length){
//loop that will show first image again after it will show the last one
$('.imageClass').eq(current).fadeOut(500);
current++;
$('.imageClass').eq(current).fadeIn(500);
} else {
$('.imageClass').eq(current).fadeOut(500);
current=0;
$('.imageClass').eq(current).fadeIn(500);
}
}
changeBackground();
setInterval(changeBackground, 3000);
});
That should work, hope you will like it.
You may also use jQuery plugin backstretch.
Related
http://jsfiddle.net/pdb4kb1a/2/
The code works just fine on JSFiddle, but I cant get it to work when I use it in a HTML/CSS file. Only the 50x200 image is displayed, no signs of the simple slideshow or fade effect. I work in Sublime text, could that create any problems?
var imgArray = [
'http://placehold.it/300x200',
'http://placehold.it/200x100',
'http://placehold.it/400x300'],
curIndex = 0;
imgDuration = 3000;
function slideShow() {
document.getElementById('slider').className += "fadeOut";
setTimeout(function() {
document.getElementById('slider').src = imgArray[curIndex];
document.getElementById('slider').className = "";
},1000);
curIndex++;
if (curIndex == imgArray.length) { curIndex = 0; }
setTimeout(slideShow, imgDuration);
}
slideShow();
#slider {
opacity:1;
transition: opacity 1s;
}
#slider.fadeOut {
opacity:0;
}
<body>
<img id="slider" src="http://placehold.it/50x200">
</body>
JSFiddle executes the javascript code in the window.onload event. You can change this if you click the JavaScript Button in the editor of JSFiddle.
If you change it to No wrap - in <head> you'll see that it doesn't work as well. You should see an error in your console, telling you the reason.
I'm assuming that you're including your script snippet in the head section of your HTML Document.
If you take your code as posted in your question, your slider isn't loaded yet, because the script is executed before your HTML document is fully loaded. You have to wrap the call to your slideShow function inside the onloadevent (or if you're using jQuery you'll probably use $(document).ready(function(){ ... }) instead.
This should do the trick then:
window.onload = function() {
slideShow();
}
Including the script at the bottom of your HTML document should work as well as an alternative.
I have the following code for changing a divs background image with jquery, i need help to add a fade to the code so the image change with some effect
this is the code
jQuery(window).load(function(){
var images = ['blured/1.jpg','blured/2.jpg'];
var i = 0;
var timeoutVar;
function changeBackground() {
clearTimeout(timeoutVar); // just to be sure it will run only once at a time
jQuery('#maincont').css('background-image', function() {
if (i >= images.length) {
i=0;
}
return 'url(' + images[i++] + ')';
});
// call the setTimeout every time to repeat the function
timeoutVar = setTimeout(changeBackground, 6000);
}
// Call it on the first time and it will repeat
changeBackground();
});
Any help will be great!
i need to just change the background image, without fading the inside divs, this is the html
<div class="maincont" id="maincont">
<div class="containersrch">
<h1 class="lagro">some title</h1>
<div class="joinus">
<span>JOIN</span>
</div>
</div>
Maybe this is what you want?
$(function(){
var imgId = $('#maincont'), imgCount = 1, imgLast = 2;
setInterval(function(){
imgId.fadeOut('slow', function(){
if(++imgCount > imgLast)imgCount = 1;
imgId.css('background', "url('blured/"+imgCount+".jpg')");
imgId.fadeIn('slow');
});
}, 6000);
});
Now you can have multiple images, just change imgLast to the last number and make sure they have the correct URLs in your blured folder. Of course, the code above assumes you are using .jpg. I actually recommend the lossless compression of .png, but it won't matter if it's the image was taken as a .jpg.
On my page there is ajax action, which loads div, that contain image on left and text on right.
The problem: first of all text loads, and on the left (it aligned left), then image loads, text shifts on right, and that looks really not smooth.
I tried something like :
$('div#to_load').ready(function() {
$('div#to_load').fadeIn();
});
but that doesn't help.
What can I do?
Update
I think you have to try this trick found here :
$("<img />", { src:"thelinkofyourimage"}).appendTo("div#to_load").fadeOut(0).fadeIn(1000);
Have a look to this fiddle : http://jsfiddle.net/qYHCn/.
You could track when all the images have loaded like so
var element = $('div#to_load');
var images = element.find('img');
var count = images.length;
for( var i = 0; i < count; i++) {
$(images[i]).load(function(){
count--;
if( count === 0 ){
element.fadeIn();
}
});
}
You could smoothly animate it in with jQuery (handy anyway when you are doing your ajax requests with jQuery):
jQuery
$("body").prepend('<img src="http://placehold.it/150x150" alt="img">');
$("img").animate({
opacity: 1,
left: 0
}, 700);
CSS
img {
float: left;
margin-right: 0.8em ;
left: -300px;
position: relative;
}
Fiddle.
Try to load image and text separately, not at once.
And for the shifting problem put image inside another div and define the size when it loads. Then text can't come to image space since we already giving space for image div.
sample code
$('#ImageID')
.load(
function(){
//Do stuff once the image specified above is loaded
$('#textId').html('your text');
}
);
If you don't want content to shift, you must declare the size the image will take up so that the required space is already accounted for when the browser does it's render.
Make sure you declare the size of the image, or the size of the container before you load
<div id="to_load">
<img src="...." height="400" width="400" />
</div>
or
<div id="to_load" style="height:400px;width:400px;overflow:hidden">
..dynamic content
</div>
Declaring image size either on the img element or in your stylesheet is a best practice recommendation anyways
Reflows & Repaint
Maybe you'd like something like this
#to_load {
width: 523px;
height: 192px;
}
#to_load img {
display: none;
}
setTimeout(function() {
$("<img />", { src:"http://ejohn.org/apps/workshop/adv-talk/jquery_logo.png"})
.on('load', function(){
$(this).appendTo("#to_load").fadeIn(500);
});
},1000);
http://jsfiddle.net/AWntU/
I am trying to add a scroll event which will change the background of a div which also acts as the window background (it has 100% width and height). This is as far as I get. I am not so good at jquery. I have seen tutorials with click event listeners. but applying the same concept , like, returning scroll event as false, gets me nowhere. also I saw a tutorial on SO where the person suggest use of array. but I get pretty confused using arrays (mostly due to syntax).
I know about plugins like waypoints.js and skrollr.js which can be used but I need to change around 50-60 (for the illusion of a video being played when scrolled) ... but it wont be feasible.
here is the code im using:-
*
{
border: 2px solid black;
}
#frame
{
background: url('1.jpg') no-repeat;
height: 1000px;
width: 100%;
}
</style>
<script>
$(function(){
for ( i=0; i = $.scrolltop; i++)
{
$("#frame").attr('src', ''+i+'.jpg');
}
});
</script>
<body>
<div id="frame"></div>
</body>
Inside your for loop, you are setting the src attribute of #frame but it is a div not an img.
So, instead of this:
$("#frame").attr('src', ''+i+'.jpg');
Try this:
$("#frame").css('background-image', 'url(' + i + '.jpg)');
To bind a scroll event to a target element with jQuery:
$('#target').scroll(function() {
//do stuff here
});
To bind a scroll event to the window with jQuery:
$(window).scroll(function () {
//do stuff here
});
Here is the documentation for jQuery .scroll().
UPDATE:
If I understand right, here is a working demo on jsFiddle of what you want to achieve.
CSS:
html, body {
min-height: 1200px; /* for testing the scroll bar */
}
div#frame {
display: block;
position: fixed; /* Set this to fixed to lock that element on the position */
width: 300px;
height: 300px;
z-index: -1; /* Keep the bg frame at the bottom of other elements. */
}
Javascript:
$(document).ready(function() {
switchImage();
});
$(window).scroll(function () {
switchImage();
});
//using images from dummyimages.com for demonstration (300px by 300px)
var images = ["http://dummyimage.com/300x300/000000/fff",
"http://dummyimage.com/300x300/ffcc00/000",
"http://dummyimage.com/300x300/ff0000/000",
"http://dummyimage.com/300x300/ff00cc/000",
"http://dummyimage.com/300x300/ccff00/000"
];
//Gets a valid index from the image array using the scroll-y value as a factor.
function switchImage()
{
var sTop = $(window).scrollTop();
var index = sTop > 0 ? $(document).height() / sTop : 0;
index = Math.round(index) % images.length;
//console.log(index);
$("#frame").css('background-image', 'url(' + images[index] + ')');
}
HTML:
<div id="frame"></div>
Further Suggestions:
I suggest you change the background-image of the body, instead of the div. But, if you have to use a div for this; then you better add a resize event-istener to the window and set/update the height of that div with every resize. The reason is; height:100% does not work as expected in any browser.
I've done this before myself and if I were you I wouldn't use the image as a background, instead use a normal "img" tag prepend it to the top of your page use some css to ensure it stays in the back under all of the other elements. This way you could manipulate the size of the image to fit screen width better. I ran into a lot of issues trying to get the background to size correctly.
Html markup:
<body>
<img src="1.jpg" id="img" />
</body>
Script code:
$(function(){
var topPage = 0, count = 0;
$(window).scroll( function() {
topPage = $(document).scrollTop();
if(topPage > 200) {
// function goes here
$('img').attr('src', ++count +'.jpg');
}
});
});
I'm not totally sure if this is what you're trying to do but basically, when the window is scrolled, you assign the value of the distance to the top of the page, then you can run an if statement to see if you are a certain point. After that just simply change run the function you would like to run.
If you want to supply a range you want the image to change from do something like this, so what will happen is this will allow you to run a function only between the specificied range between 200 and 400 which is the distance from the top of the page.
$(function(){
var topPage = 0, count = 0;
$(window).scroll( function() {
topPage = $(document).scrollTop();
if(topPage > 200 && topPage < 400) {
// function goes here
$('#img').attr('src', ++count +'.jpg');
}
});
});
I have some simple code to replace an image src. It is working correctly but everytime the image is updated, the browser skips right back to the top of the page.
I have several image tags in my page. All of which hidden, except for the first one. The script just iterates through them and uses the src attribute to update the first image.
Here is the code I am using:
var j = jQuery.noConflict();
var count = 1;
var img;
function update_main_image()
{
count++;
if (j('#main_image_picture_'+count).length > 0)
{
img = j('#main_image_picture_'+count).attr('src');
}
else
{
count = 1;
img = j('#main_image_picture_'+count).attr('src');
}
j(".main_image_picture_auto").fadeOut(1500, function() {
j(this).fadeIn();
j(this).attr("src", img);
});
}
j(document).ready(function()
{
setInterval(update_main_image, 6000);
});
Any ideas what might be causing it?
Any advice appreciated.
Thanks.
Try to add DIV around your IMG.main_image_picture_auto with width and height style properties setted to maximum posible image size, for example:
<div style='width:400px; height:400px; border: 0px; background: transparent; '>
<img class='main_image_picture_auto' src=''/>
</div>
<!-- Where width:400px and height:400px is maximum allowed image size -->
And I think, that is better to use setTimeout instead of setInterval
function update_main_image() {
// ....
setTimeout(update_main_image, 6000);
}
j(document).ready(function() {
setTimeout(update_main_image, 6000);
});
http://jsfiddle.net/UBEWS/