Chrome的加载指示灯一直在XMLHtt prequest纺 [英] Chrome's loading indicator keeps spinning during XMLHttpRequest
问题描述
我在写一个AJAX的Web应用程序，使用彗星/长轮询保持网页更新，而且我注意到，在Chrome浏览器，它把该页面，如果它总是加载（图标的选项卡都在旋转）。
我认为这是正常的谷歌浏览器+ Ajax的，因为即使谷歌Wave有这种行为。
好了，今天我注意到，谷歌Wave不再保持加载图标纺纱，任何人都知道他们是怎么定的？
下面是我的ajax调用code
VAR xmlHtt preQ = FALSE;
// Mozilla的/ Safari浏览器
如果（window.XMLHtt prequest）{
xmlHtt preQ =新XMLHtt prequest（）;
}
// IE
否则，如果（window.ActiveXObject）{
xmlHtt preQ =新的ActiveXObject（Microsoft.XMLHTTP）;
}
xmlHtt preq.open（GET，myURL，真正的）;
xmlHtt preq.setRequestHeader（内容类型，应用程序/ x-WWW的形式urlen codeD'）;
xmlHtt preq.onreadystatechange =功能（）{
如果（xmlHtt preq.readyState == 4）{
的updatePage（xmlHtt preq.responseText）;
}
}
xmlHtt preq.send（空）;
我无耻地窃取了奥列格的测试用例和调整，有点模仿长轮询。
load.html ：
＆LT;！DOCTYPE HTML＆GT;
＆LT; HEAD＆GT;
＆LT;标题＆gt;将jQery.load问题＆LT示范; /标题＆GT;
＆所述;脚本的src =的http：//$c$c.jquery.com/jquery-latest.js＆GT;＆所述; /脚本＆GT;
＆LT;脚本＆GT;
jQuery的（文件）。就绪（函数（）{
$（'＃主）的负载（test.php的）。
}）;
＆LT; / SCRIPT＆GT;
＆LT; /头＆GT;
＆LT;身体GT;
＆LT; DIV ID ='主'＆GT;＆LT; / DIV＆GT;
＆LT; /身体GT;
＆LT; / HTML＆GT;
的test.php ：
＆LT; PHP
睡眠（5）;
？＆GT;
＆LT; B＆GT;确定＆LT;！/ B＆GT;
结果很有趣：在Firefox和Opera，没有加载指示灯在XMLHTT prequests所示。 Chrome浏览器让它旋转......我怀疑谷歌Wave不使用长轮询了（但是，例如，调查每X秒，以节省资源），但我不能测试它，因为我没有一个帐户
编辑：我想通了：加入少许延迟加载的test.php ，它可以尽可能小后，后加载指示灯停止 load.html 已加载：
jQuery的（文件）。就绪（函数（）{
的setTimeout（函数（）{
$（'＃主）的负载（test.php的）。
}，0）;
}）;
不知怎么的，为的是<一个href="http://stackoverflow.com/questions/1064782/stop-the-browser-throbber-of-doom-while-loading-comet-server-push-iframe/1066729#comment-894061">confirmed在评论在另一个答案，当浏览器获得控制回来完成网页渲染，指示停止旋转。另一个优点是，该请求不能被pressing中止 Esc键
I'm writing an AJAX web app that uses Comet/Long Polling to keep the web page up to date, and I noticed in Chrome, it treats the page as if it's always loading (icon for the tab keeps spinning).
I thought this was normal for Google Chrome + Ajax because even Google Wave had this behaviour.
Well today I noticed that Google Wave no longer keeps the loading icon spinning, anyone know how they fixed this?
Here's my ajax call code
var xmlHttpReq = false;
// Mozilla/Safari
if (window.XMLHttpRequest) {
xmlHttpReq = new XMLHttpRequest();
}
// IE
else if (window.ActiveXObject) {
xmlHttpReq = new ActiveXObject("Microsoft.XMLHTTP");
}
xmlHttpReq.open('GET', myURL, true);
xmlHttpReq.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
xmlHttpReq.onreadystatechange = function() {
if (xmlHttpReq.readyState == 4) {
updatePage(xmlHttpReq.responseText);
}
}
xmlHttpReq.send(null);
I shamelessly stole Oleg's test case and adjusted it a bit to simulate long-polling.
load.html:
<!DOCTYPE html>
<head>
<title>Demonstration of the jQery.load problem</title>
<script src="http://code.jquery.com/jquery-latest.js"></script>
<script>
jQuery(document).ready(function() {
$('#main').load("test.php");
});
</script>
</head>
<body>
<div id='main'></div>
</body>
</html>
test.php:
<?php
sleep(5);
?>
<b>OK!</b>
The result is interesting: in Firefox and Opera, no loading indicator is shown during XMLHTTPRequests. Chrome lets it spinning... I suspect Google Wave doesn't use long polling anymore (but, for instance, polls every X seconds, to save resources), but I can't test it, as I don't have an account.
EDIT: And I figured it out: after adding a little delay in loading test.php, which can be as small as possible, the loading indicator stops after load.html has been loaded:
jQuery(document).ready(function() {
setTimeout(function () {
$('#main').load("test.php");
}, 0);
});
Somehow, as is confirmed in a comment on another answer, when the browser gets control back to finish page rendering, the indicator stops spinning. Another advantage is that the request cannot be aborted by pressing Esc.
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