Javascript event when page is actually shown in a web browser
I'm developing a web site which shows different images in a loop using cross fading. Now, I want this loop to start no earlier than the page is actually shown by the user. The typical scenario is when the user fires up a new tab entering the url of my site, goes back to an old tab (or opens a new tab), waiting for my site to load. As soon as the site has been loaded, he goes back to the tab where my site has been loaded: I want the loop to start only when the tab contain开发者_JAVA百科ing the loaded page gets the focus.
How can I do that? I'm using the jQuery lib but plain vanilla javascript would be as great.
Thanks.
<html><head>
<script type="text/javascript">
window.__hasfocus = true;
window.onload = function() {
window.__loaded = true;
if(window.__hasfocus && !window.__startFlag) start();
}
window.onblur = function() { window.__hasfocus = false; }
window.onfocus = function() {
if(window.__loaded && !window.__startFlag) start();
}
function start() {
window.__startFlag = true;
alert('starting');
}
</script>
</head>
<body>
<img title="" src="http://stereo.gsfc.nasa.gov/img/spaceweather/preview/tricompSW.jpg">
</body>
</html>
加载中,请稍侯......
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