How to fade loop gallery background images
I wish to rotate a background image of a div which I believe precludes me from using the excellant jQuery Cycle Plugin.
The code below is what I have so far but it does not behave as I would like, which is:
- Fade out first image
- Swap image with second image while not showing an image - (fails this Fade in second image)
- And repeat into infinity ...and beyond.
<script type='text/javascript' src='http://code.jquery.com/jquery-1.5.2.js'></script>
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8.9/jquery-ui.js"></script>
<link rel="stylesheet" type="text/css" href="/css/normalize.css">
<link rel="stylesheet" type="text/css" href="/css/result-light.css">
<style type='text/css'>
#mydiv {
width: 100%;
height: 365px;
margin-left: auto;
margin-right: auto;
position: relative;
display: block;
background: url(HP_jQuery1.jpg) center top no-repeat;
}
</style>
<script type='text/javascript'>
$(window).load(function(){
var firstTime = true;
var arr = ["url(HP_jQuery2.jpg)", "url(HP_jQuery3.jpg)"];
(function recurse(counter) {
var bgImage = arr[counter];
if (firstTime == false) {
$("#mydiv").fadeOut("slow");
$('#mydiv').css('background-image', bgImage);
$("#mydiv").fadeIn("slow");
} else {
firstTime = false;
}
开发者_Python百科 delete arr[counter];
arr.push(bgImage);
setTimeout(function() {
recurse(counter + 1);
}, 3600);
})(0);
});
</script>
</head>
<body>
<div id="mydiv"> </div>
</body>
Use-case jsBin Demo
In order to Cross-fade a background image, you'll need an extra layer to overlay your gallery.
Here's an example of the logic involved:
So create a DIV an place into it normal <img> tags for the browser to pre-load images, we'll use their src afterwards to use as covered background-image for the two elements:
jQuery(function($) {
var $gallery = $("#gallery"); // Your HTML gallery
var $overlay = $("<div/>"); // An overlay to X-fade
var $images = $gallery.find("img");
var n = $images.length; // How many images we have
var c = 0; // Just a counter to loop using Reminder Operator %
$gallery.css({backgroundImage: "url("+ $images[c].src +")"}).append( $overlay );
(function loopBg(){
$overlay.hide().css({backgroundImage: "url("+ $images[++c%n].src +")"}).delay(2000).fadeTo(1200, 1, function(){
$gallery.css({backgroundImage: "url("+ $images[c%n].src +")"});
loopBg();
});
}());
});html, body{
height:100%; margin:0; /*If needed*/
}
#gallery, /*Your gallery ID */
#gallery > div /*Immediate DIV child, created by jQuery*/
{
position:absolute;
width: 100%; height:100%;
background: #000 none 50% / cover;
}
#gallery img{
display:none;
/*Exactly. We'll use them as BG images*/
}<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div id="gallery">
<!--
We'll not show images, those are just used for the browser to preload them
Let's just steal the images Sources and use them for the #gallery and #overlay backgrounds
-->
<img src="http://dummyimage.com/600x365/fc5/fff&text=Image1" />
<img src="http://dummyimage.com/600x365/cf5/fff&text=Image2" />
<img src="http://dummyimage.com/600x365/f5c/fff&text=Image3" />
</div>
加载中,请稍侯......
精彩评论