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- Use the page visibility API (when available) and document.hasFocus() instead of window.onfocus/onblur. Improves speeding up/slowing down the interval and works for iframes by default. - Add a setting for minimal interval. Maximum value is 10 min. This overrides all other intervals and cannot be changed after setting it at initialization. Can be used to reduce the frequency of requests on hosts that have low limits for used CPU time, etc. - Extend the setting of interval to support 120 sec. (60 sec, is still the default). - Always suspend after one hour of keyboard/mouse/touch inactivity. Fixes #29779. Built from https://develop.svn.wordpress.org/trunk@30293 git-svn-id: http://core.svn.wordpress.org/trunk@30292 1a063a9b-81f0-0310-95a4-ce76da25c4cd
751 lines
20 KiB
JavaScript
751 lines
20 KiB
JavaScript
/**
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* Heartbeat API
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*
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* Heartbeat is a simple server polling API that sends XHR requests to
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* the server every 15 - 60 seconds and triggers events (or callbacks) upon
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* receiving data. Currently these 'ticks' handle transports for post locking,
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* login-expiration warnings, autosave, and related tasks while a user is logged in.
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*
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* Available PHP filters (in ajax-actions.php):
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* - heartbeat_received
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* - heartbeat_send
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* - heartbeat_tick
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* - heartbeat_nopriv_received
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* - heartbeat_nopriv_send
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* - heartbeat_nopriv_tick
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* @see wp_ajax_nopriv_heartbeat(), wp_ajax_heartbeat()
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*
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* Custom jQuery events:
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* - heartbeat-send
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* - heartbeat-tick
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* - heartbeat-error
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* - heartbeat-connection-lost
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* - heartbeat-connection-restored
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* - heartbeat-nonces-expired
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*
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* @since 3.6.0
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*/
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( function( $, window, undefined ) {
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var Heartbeat = function() {
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var $document = $(document),
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settings = {
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// Suspend/resume
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suspend: false,
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// Whether suspending is enabled
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suspendEnabled: true,
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// Current screen id, defaults to the JS global 'pagenow' when present (in the admin) or 'front'
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screenId: '',
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// XHR request URL, defaults to the JS global 'ajaxurl' when present
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url: '',
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// Timestamp, start of the last connection request
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lastTick: 0,
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// Container for the enqueued items
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queue: {},
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// Connect interval (in seconds)
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mainInterval: 60,
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// Used when the interval is set to 5 sec. temporarily
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tempInterval: 0,
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// Used when the interval is reset
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originalInterval: 0,
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// Used to limit the number of AJAX requests.
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minimalInterval: 0,
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// Used together with tempInterval
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countdown: 0,
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// Whether a connection is currently in progress
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connecting: false,
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// Whether a connection error occurred
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connectionError: false,
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// Used to track non-critical errors
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errorcount: 0,
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// Whether at least one connection has completed successfully
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hasConnected: false,
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// Whether the current browser window is in focus and the user is active
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hasFocus: true,
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// Timestamp, last time the user was active. Checked every 30 sec.
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userActivity: 0,
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// Flags whether events tracking user activity were set
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userActivityEvents: false,
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checkFocusTimer: 0,
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beatTimer: 0
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};
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/**
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* Set local vars and events, then start
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*
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* @access private
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*
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* @return void
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*/
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function initialize() {
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var options, hidden, visibilityState, visibilitychange;
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if ( typeof window.pagenow === 'string' ) {
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settings.screenId = window.pagenow;
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}
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if ( typeof window.ajaxurl === 'string' ) {
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settings.url = window.ajaxurl;
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}
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// Pull in options passed from PHP
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if ( typeof window.heartbeatSettings === 'object' ) {
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options = window.heartbeatSettings;
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// The XHR URL can be passed as option when window.ajaxurl is not set
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if ( ! settings.url && options.ajaxurl ) {
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settings.url = options.ajaxurl;
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}
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// The interval can be from 15 to 120 sec. and can be set temporarily to 5 sec.
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// It can be set in the initial options or changed later from JS and/or from PHP.
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if ( options.interval ) {
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settings.mainInterval = options.interval;
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if ( settings.mainInterval < 15 ) {
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settings.mainInterval = 15;
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} else if ( settings.mainInterval > 120 ) {
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settings.mainInterval = 120;
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}
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}
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// Used to limit the number of AJAX requests. Overrides all other intervals if they are shorter.
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// Needed for some hosts that cannot handle frequent requests and the user may exceed the allocated server CPU time, etc.
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// The minimal interval can be up to 600 sec. however setting it to longer than 120 sec. will limit or disable
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// some of the functionality (like post locks).
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// Once set at initialization, minimalInterval cannot be changed/overriden.
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if ( options.minimalInterval ) {
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options.minimalInterval = parseInt( options.minimalInterval, 10 );
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settings.minimalInterval = options.minimalInterval > 0 && options.minimalInterval <= 600 ? options.minimalInterval * 1000 : 0;
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}
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if ( settings.minimalInterval && settings.mainInterval < settings.minimalInterval ) {
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settings.mainInterval = settings.minimalInterval;
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}
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// 'screenId' can be added from settings on the front-end where the JS global 'pagenow' is not set
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if ( ! settings.screenId ) {
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settings.screenId = options.screenId || 'front';
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}
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if ( options.suspension === 'disable' ) {
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settings.suspendEnabled = false;
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}
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}
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// Convert to milliseconds
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settings.mainInterval = settings.mainInterval * 1000;
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settings.originalInterval = settings.mainInterval;
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// Switch the interval to 120 sec. by using the Page Visibility API.
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// If the browser doesn't support it (Safari < 7, Android < 4.4, IE < 10), the interval
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// will be increased to 120 sec. after 5 min. of mouse and keyboard inactivity.
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if ( typeof document.hidden !== 'undefined' ) {
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hidden = 'hidden';
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visibilitychange = 'visibilitychange';
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visibilityState = 'visibilityState';
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} else if ( typeof document.msHidden !== 'undefined' ) { // IE10
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hidden = 'msHidden';
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visibilitychange = 'msvisibilitychange';
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visibilityState = 'msVisibilityState';
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} else if ( typeof document.webkitHidden !== 'undefined' ) { // Android
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hidden = 'webkitHidden';
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visibilitychange = 'webkitvisibilitychange';
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visibilityState = 'webkitVisibilityState';
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}
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if ( hidden ) {
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if ( document[hidden] ) {
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settings.hasFocus = false;
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}
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$document.on( visibilitychange + '.wp-heartbeat', function() {
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if ( document[visibilityState] === 'hidden' ) {
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blurred();
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window.clearInterval( settings.checkFocusTimer );
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} else {
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focused();
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if ( document.hasFocus ) {
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settings.checkFocusTimer = window.setInterval( checkFocus, 10000 );
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}
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}
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});
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}
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// Use document.hasFocus() if available.
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if ( document.hasFocus ) {
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settings.checkFocusTimer = window.setInterval( checkFocus, 10000 );
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}
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$(window).on( 'unload.wp-heartbeat', function() {
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// Don't connect any more
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settings.suspend = true;
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// Abort the last request if not completed
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if ( settings.xhr && settings.xhr.readyState !== 4 ) {
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settings.xhr.abort();
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}
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});
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// Check for user activity every 30 seconds.
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window.setInterval( checkUserActivity, 30000 );
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// Start one tick after DOM ready
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$document.ready( function() {
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settings.lastTick = time();
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scheduleNextTick();
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});
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}
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/**
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* Return the current time according to the browser
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*
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* @access private
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*
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* @return int
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*/
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function time() {
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return (new Date()).getTime();
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}
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/**
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* Check if the iframe is from the same origin
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*
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* @access private
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*
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* @return bool
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*/
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function isLocalFrame( frame ) {
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var origin, src = frame.src;
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// Need to compare strings as WebKit doesn't throw JS errors when iframes have different origin.
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// It throws uncatchable exceptions.
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if ( src && /^https?:\/\//.test( src ) ) {
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origin = window.location.origin ? window.location.origin : window.location.protocol + '//' + window.location.host;
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if ( src.indexOf( origin ) !== 0 ) {
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return false;
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}
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}
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try {
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if ( frame.contentWindow.document ) {
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return true;
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}
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} catch(e) {}
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return false;
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}
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/**
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* Check if the document's focus has changed
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*
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* @access private
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*
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* @return void
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*/
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function checkFocus() {
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if ( settings.hasFocus && ! document.hasFocus() ) {
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blurred();
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} else if ( ! settings.hasFocus && document.hasFocus() ) {
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focused();
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}
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}
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/**
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* Set error state and fire an event on XHR errors or timeout
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*
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* @access private
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*
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* @param string error The error type passed from the XHR
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* @param int status The HTTP status code passed from jqXHR (200, 404, 500, etc.)
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* @return void
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*/
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function setErrorState( error, status ) {
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var trigger;
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if ( error ) {
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switch ( error ) {
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case 'abort':
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// do nothing
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break;
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case 'timeout':
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// no response for 30 sec.
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trigger = true;
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break;
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case 'error':
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if ( 503 === status && settings.hasConnected ) {
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trigger = true;
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break;
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}
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/* falls through */
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case 'parsererror':
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case 'empty':
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case 'unknown':
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settings.errorcount++;
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if ( settings.errorcount > 2 && settings.hasConnected ) {
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trigger = true;
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}
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break;
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}
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if ( trigger && ! hasConnectionError() ) {
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settings.connectionError = true;
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$document.trigger( 'heartbeat-connection-lost', [error, status] );
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}
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}
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}
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/**
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* Clear the error state and fire an event
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*
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* @access private
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*
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* @return void
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*/
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function clearErrorState() {
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// Has connected successfully
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settings.hasConnected = true;
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if ( hasConnectionError() ) {
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settings.errorcount = 0;
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settings.connectionError = false;
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$document.trigger( 'heartbeat-connection-restored' );
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}
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}
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/**
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* Gather the data and connect to the server
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*
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* @access private
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*
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* @return void
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*/
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function connect() {
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var ajaxData, heartbeatData;
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// If the connection to the server is slower than the interval,
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// heartbeat connects as soon as the previous connection's response is received.
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if ( settings.connecting || settings.suspend ) {
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return;
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}
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settings.lastTick = time();
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heartbeatData = $.extend( {}, settings.queue );
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// Clear the data queue, anything added after this point will be send on the next tick
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settings.queue = {};
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$document.trigger( 'heartbeat-send', [ heartbeatData ] );
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ajaxData = {
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data: heartbeatData,
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interval: settings.tempInterval ? settings.tempInterval / 1000 : settings.mainInterval / 1000,
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_nonce: typeof window.heartbeatSettings === 'object' ? window.heartbeatSettings.nonce : '',
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action: 'heartbeat',
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screen_id: settings.screenId,
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has_focus: settings.hasFocus
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};
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settings.connecting = true;
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settings.xhr = $.ajax({
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url: settings.url,
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type: 'post',
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timeout: 30000, // throw an error if not completed after 30 sec.
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data: ajaxData,
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dataType: 'json'
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}).always( function() {
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settings.connecting = false;
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scheduleNextTick();
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}).done( function( response, textStatus, jqXHR ) {
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var newInterval;
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if ( ! response ) {
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setErrorState( 'empty' );
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return;
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}
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clearErrorState();
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if ( response.nonces_expired ) {
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$document.trigger( 'heartbeat-nonces-expired' );
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return;
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}
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// Change the interval from PHP
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if ( response.heartbeat_interval ) {
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newInterval = response.heartbeat_interval;
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delete response.heartbeat_interval;
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}
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$document.trigger( 'heartbeat-tick', [response, textStatus, jqXHR] );
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// Do this last, can trigger the next XHR if connection time > 5 sec. and newInterval == 'fast'
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if ( newInterval ) {
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interval( newInterval );
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}
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}).fail( function( jqXHR, textStatus, error ) {
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setErrorState( textStatus || 'unknown', jqXHR.status );
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$document.trigger( 'heartbeat-error', [jqXHR, textStatus, error] );
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});
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}
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/**
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* Schedule the next connection
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*
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* Fires immediately if the connection time is longer than the interval.
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*
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* @access private
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*
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* @return void
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*/
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function scheduleNextTick() {
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var delta = time() - settings.lastTick,
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interval = settings.mainInterval;
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if ( settings.suspend ) {
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return;
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}
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if ( ! settings.hasFocus ) {
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interval = 120000; // 120 sec. Post locks expire after 150 sec.
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} else if ( settings.countdown > 0 && settings.tempInterval ) {
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interval = settings.tempInterval;
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settings.countdown--;
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if ( settings.countdown < 1 ) {
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settings.tempInterval = 0;
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}
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}
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if ( settings.minimalInterval && interval < settings.minimalInterval ) {
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interval = settings.minimalInterval;
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}
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window.clearTimeout( settings.beatTimer );
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if ( delta < interval ) {
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settings.beatTimer = window.setTimeout(
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function() {
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connect();
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},
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interval - delta
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);
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} else {
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connect();
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}
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}
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/**
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* Set the internal state when the browser window becomes hidden or loses focus
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*
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* @access private
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*
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* @return void
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*/
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function blurred() {
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settings.hasFocus = false;
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}
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/**
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* Set the internal state when the browser window becomes visible or is in focus
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*
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* @access private
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*
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* @return void
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*/
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function focused() {
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settings.userActivity = time();
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// Resume if suspended
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settings.suspend = false;
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if ( ! settings.hasFocus ) {
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settings.hasFocus = true;
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scheduleNextTick();
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}
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}
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/**
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* Runs when the user becomes active after a period of inactivity
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*
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* @access private
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*
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* @return void
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*/
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function userIsActive() {
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settings.userActivityEvents = false;
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$document.off( '.wp-heartbeat-active' );
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$('iframe').each( function( i, frame ) {
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if ( isLocalFrame( frame ) ) {
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$( frame.contentWindow ).off( '.wp-heartbeat-active' );
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}
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});
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focused();
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}
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/**
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* Check for user activity
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*
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* Runs every 30 sec.
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* Sets 'hasFocus = true' if user is active and the window is in the background.
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* Set 'hasFocus = false' if the user has been inactive (no mouse or keyboard activity)
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* for 5 min. even when the window has focus.
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*
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* @access private
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*
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* @return void
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*/
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function checkUserActivity() {
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var lastActive = settings.userActivity ? time() - settings.userActivity : 0;
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// Throttle down when no mouse or keyboard activity for 5 min.
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if ( lastActive > 300000 && settings.hasFocus ) {
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blurred();
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}
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// Suspend after 10 min. of inactivity when suspending is enabled.
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// Always suspend after 60 min. of inactivity. This will release the post lock, etc.
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if ( ( settings.suspendEnabled && lastActive > 600000 ) || lastActive > 3600000 ) {
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settings.suspend = true;
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}
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if ( ! settings.userActivityEvents ) {
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$document.on( 'mouseover.wp-heartbeat-active keyup.wp-heartbeat-active touchend.wp-heartbeat-active', function() {
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userIsActive();
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});
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$('iframe').each( function( i, frame ) {
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if ( isLocalFrame( frame ) ) {
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$( frame.contentWindow ).on( 'mouseover.wp-heartbeat-active keyup.wp-heartbeat-active touchend.wp-heartbeat-active', function() {
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userIsActive();
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});
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}
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});
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settings.userActivityEvents = true;
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}
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}
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// Public methods
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/**
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* Whether the window (or any local iframe in it) has focus, or the user is active
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*
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* @return bool
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*/
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function hasFocus() {
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return settings.hasFocus;
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}
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/**
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* Whether there is a connection error
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*
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* @return bool
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*/
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function hasConnectionError() {
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return settings.connectionError;
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}
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/**
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* Connect asap regardless of 'hasFocus'
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*
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* Will not open two concurrent connections. If a connection is in progress,
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* will connect again immediately after the current connection completes.
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*
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* @return void
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*/
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function connectNow() {
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settings.lastTick = 0;
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scheduleNextTick();
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}
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/**
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* Disable suspending
|
|
*
|
|
* Should be used only when Heartbeat is performing critical tasks like autosave, post-locking, etc.
|
|
* Using this on many screens may overload the user's hosting account if several
|
|
* browser windows/tabs are left open for a long time.
|
|
*
|
|
* @return void
|
|
*/
|
|
function disableSuspend() {
|
|
settings.suspendEnabled = false;
|
|
}
|
|
|
|
/**
|
|
* Get/Set the interval
|
|
*
|
|
* When setting to 'fast' or 5, by default interval is 5 sec. for the next 30 ticks (for 2 min and 30 sec).
|
|
* In this case the number of 'ticks' can be passed as second argument.
|
|
* If the window doesn't have focus, the interval slows down to 2 min.
|
|
*
|
|
* @param mixed speed Interval: 'fast' or 5, 15, 30, 60, 120
|
|
* @param string ticks Used with speed = 'fast' or 5, how many ticks before the interval reverts back
|
|
* @return int Current interval in seconds
|
|
*/
|
|
function interval( speed, ticks ) {
|
|
var newInterval,
|
|
oldInterval = settings.tempInterval ? settings.tempInterval : settings.mainInterval;
|
|
|
|
if ( speed ) {
|
|
switch ( speed ) {
|
|
case 'fast':
|
|
case 5:
|
|
newInterval = 5000;
|
|
break;
|
|
case 15:
|
|
newInterval = 15000;
|
|
break;
|
|
case 30:
|
|
newInterval = 30000;
|
|
break;
|
|
case 60:
|
|
newInterval = 60000;
|
|
break;
|
|
case 120:
|
|
newInterval = 120000;
|
|
break;
|
|
case 'long-polling':
|
|
// Allow long polling, (experimental)
|
|
settings.mainInterval = 0;
|
|
return 0;
|
|
default:
|
|
newInterval = settings.originalInterval;
|
|
}
|
|
|
|
if ( settings.minimalInterval && newInterval < settings.minimalInterval ) {
|
|
newInterval = settings.minimalInterval;
|
|
}
|
|
|
|
if ( 5000 === newInterval ) {
|
|
ticks = parseInt( ticks, 10 ) || 30;
|
|
ticks = ticks < 1 || ticks > 30 ? 30 : ticks;
|
|
|
|
settings.countdown = ticks;
|
|
settings.tempInterval = newInterval;
|
|
} else {
|
|
settings.countdown = 0;
|
|
settings.tempInterval = 0;
|
|
settings.mainInterval = newInterval;
|
|
}
|
|
|
|
// Change the next connection time if new interval has been set.
|
|
// Will connect immediately if the time since the last connection
|
|
// is greater than the new interval.
|
|
if ( newInterval !== oldInterval ) {
|
|
scheduleNextTick();
|
|
}
|
|
}
|
|
|
|
return settings.tempInterval ? settings.tempInterval / 1000 : settings.mainInterval / 1000;
|
|
}
|
|
|
|
/**
|
|
* Enqueue data to send with the next XHR
|
|
*
|
|
* As the data is send asynchronously, this function doesn't return the XHR response.
|
|
* To see the response, use the custom jQuery event 'heartbeat-tick' on the document, example:
|
|
* $(document).on( 'heartbeat-tick.myname', function( event, data, textStatus, jqXHR ) {
|
|
* // code
|
|
* });
|
|
* If the same 'handle' is used more than once, the data is not overwritten when the third argument is 'true'.
|
|
* Use wp.heartbeat.isQueued('handle') to see if any data is already queued for that handle.
|
|
*
|
|
* $param string handle Unique handle for the data. The handle is used in PHP to receive the data.
|
|
* $param mixed data The data to send.
|
|
* $param bool noOverwrite Whether to overwrite existing data in the queue.
|
|
* $return bool Whether the data was queued or not.
|
|
*/
|
|
function enqueue( handle, data, noOverwrite ) {
|
|
if ( handle ) {
|
|
if ( noOverwrite && this.isQueued( handle ) ) {
|
|
return false;
|
|
}
|
|
|
|
settings.queue[handle] = data;
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* Check if data with a particular handle is queued
|
|
*
|
|
* $param string handle The handle for the data
|
|
* $return bool Whether some data is queued with this handle
|
|
*/
|
|
function isQueued( handle ) {
|
|
if ( handle ) {
|
|
return settings.queue.hasOwnProperty( handle );
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Remove data with a particular handle from the queue
|
|
*
|
|
* $param string handle The handle for the data
|
|
* $return void
|
|
*/
|
|
function dequeue( handle ) {
|
|
if ( handle ) {
|
|
delete settings.queue[handle];
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Get data that was enqueued with a particular handle
|
|
*
|
|
* $param string handle The handle for the data
|
|
* $return mixed The data or undefined
|
|
*/
|
|
function getQueuedItem( handle ) {
|
|
if ( handle ) {
|
|
return this.isQueued( handle ) ? settings.queue[handle] : undefined;
|
|
}
|
|
}
|
|
|
|
initialize();
|
|
|
|
// Expose public methods
|
|
return {
|
|
hasFocus: hasFocus,
|
|
connectNow: connectNow,
|
|
disableSuspend: disableSuspend,
|
|
interval: interval,
|
|
hasConnectionError: hasConnectionError,
|
|
enqueue: enqueue,
|
|
dequeue: dequeue,
|
|
isQueued: isQueued,
|
|
getQueuedItem: getQueuedItem
|
|
};
|
|
};
|
|
|
|
// Ensure the global `wp` object exists.
|
|
window.wp = window.wp || {};
|
|
window.wp.heartbeat = new Heartbeat();
|
|
|
|
}( jQuery, window ));
|