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/*!
* jquery-visibility v1.0.11
* Page visibility shim for jQuery.
*
* Project Website: http://mths.be/visibility
*
* @version 1.0.11
* @license MIT.
* @author Mathias Bynens - @mathias
* @author Jan Paepke - @janpaepke
*/
;(function (root, factory) {
if (typeof define === 'function' && define.amd) {
// AMD. Register as an anonymous module.
define(['jquery'], function ($) {
return factory(root, $);
});
} else if (typeof exports === 'object') {
// Node/CommonJS
module.exports = factory(root, require('jquery'));
} else {
// Browser globals
factory(root, jQuery);
}
}(this, function(window, $, undefined) {
"use strict";
var
document = window.document,
property, // property name of document, that stores page visibility
vendorPrefixes = ['webkit', 'o', 'ms', 'moz', ''],
$support = $.support || {},
// In Opera, `'onfocusin' in document == true`, hence the extra `hasFocus` check to detect IE-like behavior
eventName = 'onfocusin' in document && 'hasFocus' in document ?
'focusin focusout' :
'focus blur';
var prefix;
while ((prefix = vendorPrefixes.pop()) !== undefined) {
property = (prefix ? prefix + 'H': 'h') + 'idden';
$support.pageVisibility = document[property] !== undefined;
if ($support.pageVisibility) {
eventName = prefix + 'visibilitychange';
break;
}
}
// normalize to and update document hidden property
function updateState() {
if (property !== 'hidden') {
document.hidden = $support.pageVisibility ? document[property] : undefined;
}
}
updateState();
$(/blur$/.test(eventName) ? window : document).on(eventName, function(event) {
var type = event.type;
var originalEvent = event.originalEvent;
// Avoid errors from triggered native events for which `originalEvent` is
// not available.
if (!originalEvent) {
return;
}
var toElement = originalEvent.toElement;
// If it’s a `{focusin,focusout}` event (IE), `fromElement` and `toElement`
// should both be `null` or `undefined`; else, the page visibility hasn’t
// changed, but the user just clicked somewhere in the doc. In IE9, we need
// to check the `relatedTarget` property instead.
if (
!/^focus./.test(type) || (
toElement === undefined &&
originalEvent.fromElement === undefined &&
originalEvent.relatedTarget === undefined
)
) {
$(document).triggerHandler(
property && document[property] || /^(?:blur|focusout)$/.test(type) ?
'hide' :
'show'
);
}
// and update the current state
updateState();
});
}));
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