加载图像后重定向 [英] Redirect after loading images
问题描述
所以我最近开发了一个网站,问题是每个页面的背景都是图像,因此,在较慢的连接上(某些目标受众的情况),图像会逐渐加载。下载,解决这个问题我试图做一个预加载页面,执行以下操作:
So I have been recently developing a site, The problem is the backgrounds for each page are images, and as a result, on slower connections (which is the case of some of the target audience) the images load progressivly as they are downloaded, to resolve this I am trying to make a preloading page that does the following :
- 加载图像
-
加载完成后,将用户重定向到请求的页面
- Loads the Images
Once the loading is done, redirects the user to the requested page
<script type="text/javascript">
<!--//--><![CDATA[//><!--
var images = new Array()
var count=0;
function preload() {
for (i = 0; i < preload.arguments.length; i++) {
images[i] = new Image()
images[i].src = preload.arguments[i]
}
if(count==4) {
window.location = "index.html";
}
}
preload(
"backgrounds/bg1.jpg",
"backgrounds/bg2.jpg",
"backgrounds/bg3.jpg",
"backgrounds/bg4.jpg"
)
//--><!]]>
问题是它直接重定向(我假设它只是开始下载图像然后直接将一个添加到计数器变量,快速达到4并且不给图像下载时间。
The problem is it redirects directly (I assume that it just starts the download of the image then directly adds one to the counter variable, quickly reaching 4 and not giving the image the time to download.
任何想法如何让我在图像下载完成时发出信号,或者只在下载图像后执行重定向?
Any ideas how I can either make it signal me when the images have finished downloading, or only execute the redirect after it has done downloading the images ?
推荐答案
你需要等待加载
事件。这很简单:
You need to wait for the load
event. It's quite simple:
function preload(images, timeout, cb) {
var cbFired = false,
remaining = images.length,
timer = null;
function imageDone() {
remaining--;
if(remaining === 0 && !cbFired) {
cbFired = true;
clearTimeout(timer);
cb();
}
}
function timerExpired() {
if(cbFired)
return;
cbFired = true;
cb();
}
for(var i = 0; i < images.length; i++) {
var img = new Image();
img.onload = imageDone;
img.onerror = imageDone;
img.src = images[i];
}
timer = setTimeout(timerExpired, timeout);
}
您需要检查一些内容,以免用户卡住:
You need to check a few things so that users don't get stuck:
- 你需要等待
加载
和错误
以便在图片无法加载时页面不会卡住。 - 您应设置最大超时。
- 另外,在你的代码中,
i
是一个全局变量(没有var
声明)。
- You need to wait for both
load
anderror
so that the page doesn't get stuck if an image fails to load. - You should set a maximum timeout.
- Also, in your code,
i
was a global variable (novar
declaration).
以下是如何使用它:
var images = [ "backgrounds/bg1.jpg",
"backgrounds/bg2.jpg",
"backgrounds/bg3.jpg",
"backgrounds/bg4.jpg"];
preload(images, 10000 /* 10s */, function () {
window.location = 'next_page';
});
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