我正在构建一个包含大量大图像(10-40,~300kb/img)的网站,并寻找一种按顺序加载(不显示!)它们的方式。
我已经有一段 js 将在前 3 张图像加载后显示并触发轮播(其他图像将在前 3 张显示时加载到背景上),但由于图像将异步加载,它没有多大用处.
既然如此,有没有办法只在加载前一个图像时才加载图像?
这是我的html。
<div class="item active">
<img src="./img/1.jpg" alt="" />
<div class="container">
<div class="carousel-caption">
</div>
</div>
</div>
<div class="item">
<img src="./img/2.jpg" alt="" />
<div class="container">
<div class="carousel-caption">
</div>
</div>
</div>
<div class="item">
<img src="./img/3.jpg" alt="" />
<div class="container">
<div class="carousel-caption">
</div>
</div>
</div>
<div class="item">
<img src="./img/4.jpg" alt="" />
<div class="container">
<div class="carousel-caption">
</div>
</div>
</div>
还有我的js:
var numImagesLoaded = 0;
function incrementAndCheckLoading(){
numImagesLoaded++;
if(numImagesLoaded == 4){
// trigger carousel
}
}
image1 = new Image();
image1.src = "http://cccctanger.com/test/img/1.jpg"
image1.onload = incrementAndCheckLoading;
image2 = new Image();
image2.src = "http://cccctanger.com/test/img/2.jpg"
image2.onload = incrementAndCheckLoading;
image3 = new Image();
image3.src = "http://cccctanger.com/test/img/3.jpg"
image3.onload = incrementAndCheckLoading;
image4 = new Image();
image4.src = "http://cccctanger.com/test/img/status.gif"
image4.onload = incrementAndCheckLoading;
编辑:轮播是基于引导程序的!
编辑 2 和解决方案:
我已经调整了 Luis Lorenzo 的解决方案,以便在加载时将每个 img 附加到轮播。唯一的问题:图像不会按顺序附加(1-2-3-4-...),而是在加载时附加。考虑到这是我可以忍受的一个小问题,问题就解决了:))
多谢你们!!
这是js:
$(document).ready(function () {
var images = ["http://cccctanger.com/test/img/1.jpg", "http://cccctanger.com/test/img/2.jpg", "http://cccctanger.com/test/img/3.jpg", "http://cccctanger.com/test/img/4.jpg",
"http://cccctanger.com/test/img/5.jpg"];
var numImagesLoaded = 0;
$.each(images, function(k, v) {
image_temp = new Image();
image_temp.src = v;
image_temp.onload = function () {
$('#carousel-inner').append('<div class="item"
style="position: fixed; width: 100%; height: 100%;
background-image: url('+v+'); background-position: 50% 50%;
background-repeat: no-repeat no-repeat; -webkit-background-size: 100%;
-moz-background-size: 100%; -o-background-size: 100%; background-size:100%;
-webkit-background-size:cover; -moz-background-size:cover;
-o-background-size:cover; background-size:cover;"></div>');
numImagesLoaded++;
if(numImagesLoaded == 4) {
$('#status').fadeOut(); // will first fade out the loading animation
$('#preloader').delay(350).fadeOut('slow', function(){
$( "#carousel-example-generic" ).attr('data-ride', "carousel");
$( ".item" ).first().addClass( "active" );
}); // will fade out the white DIV that covers the website.
$('body').delay(350).css({'overflow':'visible'});
$('.carousel').carousel({
pause: "false",
interval: 10000
});
$('.carousel').css({'margin': 0, 'width': $(window).outerWidth(), 'height': $(window).outerHeight()});
$(window).on('resize', function() {
$('.carousel').css({'width': $(window).outerWidth(), 'height': $(window).outerHeight()});
});
}
}
});
});
和相关的html:
<div id="preloader">
<div id="status"></div>
</div>
<div id="carousel-example-generic" class="carousel slide" data-ride="0">
<!-- Wrapper for slides -->
<div class="carousel-inner" id="carousel-inner"></div>
</div>