问题
I finally have this working now but would like to know how I can use JQuery\'s animate function to make the background image changes fade in nicely when you hover over the list items on the homepage:-
http://www.thebalancedbody.ca/
The Code to make this happen so far is:-
$(\"ul#frontpage li#277 a\").hover(
function() {
$(\'#homepage_container\').css(\'background-image\', \'url(http://www.thebalancedbody.ca/wp-content/themes/balancedbody_V1/images/nutrition_background.jpg)\');
},
function() {
$(\'#homepage_container\').css(\'background-image\', \'url(http://www.thebalancedbody.ca/wp-content/themes/balancedbody_V1/images/default_background.jpg)\');
}
);
$(\"ul#frontpage li#297 a\").hover(
function() {
$(\'#homepage_container\').css(\'background-image\', \'url(http://www.thebalancedbody.ca/wp-content/themes/balancedbody_V1/images/vibration_training.jpg)\');
},
function() {
$(\'#homepage_container\').css(\'background-image\', \'url(http://www.thebalancedbody.ca/wp-content/themes/balancedbody_V1/images/default_background.jpg)\');
}
);
etc etc
How would I add the ANIMATE function to this please - thanks!!!
Thanks
Jonathan
回答1:
I don't think this can be done using jQuery's animate function because the background image does not have the necessary CSS properties to do such fading. jQuery can only utilize what the browser makes possible. (jQuery experts, correct me if I'm wrong of course.)
I guess you would have to work around this by not using genuine background-images, but div elements containing the image, positioned using position: absolute (or fixed) and z-index for stacking. You would then animate those divs.
回答2:
building on XGreen's approach above, with a few tweaks you can have an animated looping background. See here for example:
http://jsfiddle.net/srd76/36/
$(document).ready(function(){
var images = Array("http://placekitten.com/500/200",
"http://placekitten.com/499/200",
"http://placekitten.com/501/200",
"http://placekitten.com/500/199");
var currimg = 0;
function loadimg(){
$('#background').animate({ opacity: 1 }, 500,function(){
//finished animating, minifade out and fade new back in
$('#background').animate({ opacity: 0.7 }, 100,function(){
currimg++;
if(currimg > images.length-1){
currimg=0;
}
var newimage = images[currimg];
//swap out bg src
$('#background').css("background-image", "url("+newimage+")");
//animate fully back in
$('#background').animate({ opacity: 1 }, 400,function(){
//set timer for next
setTimeout(loadimg,5000);
});
});
});
}
setTimeout(loadimg,5000);
});
回答3:
<style type="text/css">
#homepage_outter { position:relative; width:100%; height:100%;}
#homepage_inner { position:absolute; top:0; left:0; z-index:10; width:100%; height:100%;}
#homepage_underlay { position:absolute; top:0; left:0; z-index:9; width:800px; height:500px; display:none;}
</style>
<script type="text/javascript">
$(function () {
$('a').hover(function () {
$('#homepage_underlay').fadeOut('slow', function () {
$('#homepage_underlay').css({ 'background-image': 'url("http://www.thebalancedbody.ca/wp-content/themes/balancedbody_V1/images/nutrition_background.jpg")' });
$('#homepage_underlay').fadeIn('slow');
});
}, function () {
$('#homepage_underlay').fadeOut('slow', function () {
$('#homepage_underlay').css({ 'background-image': 'url("http://www.thebalancedbody.ca/wp-content/themes/balancedbody_V1/images/default_background.jpg")' });
$('#homepage_underlay').fadeIn('slow');
});
});
});
</script>
<body>
<div id="homepage_outter">
<div id="homepage_inner">
<a href="#" id="run">run</a>
</div>
<div id="homepage_underlay"></div>
</div>
回答4:
I had the same problem, after loads of research and Googling, I found the following solution worked best for me! plenty of trial and error went into this one.
--- SOLVED / SOLUTION ---
JS
$(document).ready(function() {
$("header").delay(5000).queue(function(){
$(this).css({"background-image":"url(<?php bloginfo('template_url') ?>/img/header-boy-hover.jpg)"});
});
});
CSS
header {
-webkit-transition:all 1s ease-in;
-moz-transition:all 1s ease-in;
-o-transition:all 1s ease-in;
-ms-transition:all 1s ease-in;
transition:all 1s ease-in;
}
回答5:
It can be done by jquery and css. i did it in a way that can be used in dynamic situations , you just have to change background-image in jquery and it will do every thing , also you can change the time in css.
The fiddle : https://jsfiddle.net/Naderial/zohfvqz7/
Html:
<div class="test">
CSS :
.test {
/* as default, we set a background-image , but it is not nessesary */
background-image: url(http://lorempixel.com/400/200);
width: 200px;
height: 200px;
/* we set transition to 'all' properies - but you can use it just for background image either - by default the time is set to 1 second, you can change it yourself*/
transition: linear all 1s;
/* if you don't use delay , background will disapear and transition will start from a white background - you have to set the transition-delay the same as transition time OR more , so there won't be any problems */
-webkit-transition-delay: 1s;/* Safari */
transition-delay: 1s;
}
JS:
$('.test').click(function() {
//you can use all properties : background-color - background-image ...
$(this).css({
'background-image': 'url(http://lorempixel.com/400/200)'
});
});
回答6:
Have a look at this jQuery plugin from OvalPixels.
It may do the trick.
回答7:
The simplest solution would be to wrap the element with a div. That wrapping div would have the hidden background image that would appear as the inner element fades.
Here's some example javascript:
$('#wrapper').hover(function(event){
$('#inner').fadeOut(300);
}, function(event){
$('#inner').fadeIn(300);
});
and here's the html to go along with it:
<div id="wrapper"><div id="inner">Your inner text</div></div>
回答8:
Ok, I figured it out, this is pretty simple with a little html trick:
http://jsfiddle.net/kRjrn/8/
HTML
<body>
<div id="background">.
</div>
<p>hello world</p>
<p>hello world</p>
<p>hello world</p>
<p>hello world</p>
</body>
javascript
$(document).ready(function(){
$('#background').animate({ opacity: 1 }, 3000);
});
CSS
#background {
background-image: url("http://media.noupe.com//uploads/2009/10/wallpaper-pattern.jpg");
opacity: 0;
margin: 0;
padding: 0;
z-index: -1;
position: absolute;
width: 100%;
height: 100%;
}
回答9:
$('.clickable').hover(function(){
$('.selector').stop(true,true).fadeTo( 400 , 0.0, function() {
$('.selector').css('background-image',"url('assets/img/pic2.jpg')");
});
$('.selector').fadeTo( 400 , 1);
},
function(){
$('.selector').stop(false,true).fadeTo( 400 , 0.0, function() {
$('.selector').css('background-image',"url('assets/img/pic.jpg')");
});
$('.selector').fadeTo( 400 , 1);
}
);
来源：https://stackoverflow.com/questions/2983957/animate-background-image-change-with-jquery