Hello,
I have a web page that uses a large image for its background. I was hoping to use JQuery to load the image once it is downloaded (basically the way that bing.com loads it background image). Is this possible with JQuery? If so, is their a plugin that you would recommend? I apologize for being so vague, but I'm a little lost on this one.
Thanks!
You could first load the image, and then, when it has finished loading, set it as background-image. That way the browser will (hopefully) load the background image from the cache instead of redownloading it. As you requested it as a plugin:
$.fn.smartBackgroundImage = function(url){
var t = this;
//create an img so the browser will download the image:
$('<img />')
.attr('src', url)
.load(function(){ //attach onload to set background-image
t.each(function(){
$(this).css('backgroundImage', 'url('+url+')' );
});
});
return this;
}
Use it like this:
$('body').smartBackgroundImage('http://example.com/image.png');
You can't use CSS background images, because it's impossible to attach an event to the loading of the images (as far as I know).
So I'll give it a shot, but haven't tested it:
HTML:
<body>
<div class="bgimage"><img src="/bgimage.jpg" ></div>
<div>
... content ...
</div>
</body>
CSS:
.bgimage { position: absolute: }
Javascript:
$(function() {
$(".bgimage")
.css("opacity",0);
.load(function() { $(this).fadeIn(); });
});
You can go with the following trick, sorry if its a bit dirty.
Script :
jQuery.preloadImages = function() {
for (var i = 0; i < arguments.length; i++) {
jQuery("<img>").attr("src", arguments[i]);
$('.box1').attr('preloadURL', arguments[0]);
}
}
$.preloadImages("sky.jpg");
$(document).ready(function() {
if ($('.box1').attr('preloadURL') == 'sky.jpg') {
$('.box1').css({ 'background-image': 'url(sky.jpg)' },$('.box1').fadeIn(1000));
}
});
Markup :
<div class="Content">
<label>Search Bing</label>
<input type="text" />
<input type="button" value="search" />
</div>
<div class="box1"></div>
css:
.box1 {background-repeat:no-repeat; width:800px; height:600px; display:none; position:relative;}
.Content { position:absolute; left:20px; top:20px; z-index:100;}
.Content label { color:White;}
hope this helps
A little sample on : http://xgreen.co.uk/test.htm