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