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/*! http://mths.be/visibility v1.0.5 by @mathias */
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(function (window, document, $, undefined) {
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var prefix,
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property,
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// In Opera, `'onfocusin' in document == true`, hence the extra `hasFocus` check to detect IE-like behavior
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eventName = 'onfocusin' in document && 'hasFocus' in document ? 'focusin focusout' : 'focus blur',
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prefixes = ['', 'moz', 'ms', 'o', 'webkit'],
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$support = $.support,
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$event = $.event;
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while ((property = prefix = prefixes.pop()) != undefined) {
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property = (prefix ? prefix + 'H' : 'h') + 'idden';
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if ($support.pageVisibility = typeof document[property] == 'boolean') {
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eventName = prefix + 'visibilitychange';
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break;
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}
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}
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$(/blur$/.test(eventName) ? window : document).on(eventName, function (event) {
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var type = event.type,
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originalEvent = event.originalEvent;
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// If it’s a `{focusin,focusout}` event (IE), `fromElement` and `toElement` should both be `null` or `undefined`;
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// else, the page visibility hasn’t changed, but the user just clicked somewhere in the doc.
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// In IE9, we need to check the `relatedTarget` property instead.
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if (!/^focus./.test(type) || originalEvent == undefined || (originalEvent.toElement == undefined && originalEvent.fromElement == undefined && originalEvent.relatedTarget == undefined)) {
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$event.trigger((property && document[property] || /^(?:blur|focusout)$/.test(type) ? 'hide' : 'show') + '.visibility');
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}
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});
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}(this, document, jQuery));
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