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demo.html
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<!DOCTYPE html>
<meta charset="utf-8">
<title>Page Visibility plugin for jQuery</title>
<style>
pre {
white-space: pre;
white-space: pre-wrap;
word-wrap: break-word;
}
</style>
<h1>Page Visibility plugin for jQuery</h1>
<p>Detecting Page Visibility API support…</p>
<p>The page was <strong id="start-state"></strong> when the page loaded.</p>
<p><strong>Focus another tab or window</strong>, and watch the log below.</p>
<pre></pre>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.10.0/jquery.min.js"></script>
<script src="jquery-visibility.js"></script>
<script>
$(function() {
$("#start-state").text(document.hidden ? "hidden" : "visible");
var $pre = $('pre');
$('p').first().html(
$.support.pageVisibility
? 'The Page Visibility API is natively supported in this browser. The <code>hide</code> callback will only fire when this page isn’t visible anymore. Note that the page may still be visible if you change the focus to another application.'
: 'The Page Visibility API is not natively supported in this browser. The plugin will fall back to `focus` and `blur` events. If you change the focus to another application, the <code>hide</code> callback will fire, even if the window is still visible.'
);
function log(text) {
$pre.append(text + '<br>');
}
$(document).on({
'show.visibility': function() {
log('The page gained visibility; the <code>show</code> event was triggered.');
},
'hide.visibility': function() {
log('The page lost visibility; the <code>hide</code> event was triggered.');
}
});
});
</script>