WordPress/wp-includes/js/heartbeat.js

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/**
* Heartbeat API
*
* Heartbeat is a simple server polling API that sends XHR requests to
* the server every 15 seconds and triggers events (or callbacks) upon
* receiving data. Currently these 'ticks' handle transports for post locking,
* login-expiration warnings, and related tasks while a user is logged in.
*
* Available filters in ajax-actions.php:
* - heartbeat_received
* - heartbeat_send
* - heartbeat_tick
* - heartbeat_nopriv_received
* - heartbeat_nopriv_send
* - heartbeat_nopriv_tick
* @see wp_ajax_nopriv_heartbeat(), wp_ajax_heartbeat()
*
* @since 3.6.0
*/
// Ensure the global `wp` object exists.
window.wp = window.wp || {};
(function($){
var Heartbeat = function() {
var self = this,
running,
beat,
screenId = typeof pagenow != 'undefined' ? pagenow : '',
url = typeof ajaxurl != 'undefined' ? ajaxurl : '',
settings,
tick = 0,
queue = {},
interval,
connecting,
countdown = 0,
errorcount = 0,
tempInterval,
hasFocus = true,
isUserActive,
userActiveEvents,
winBlurTimeout,
frameBlurTimeout = -1;
this.autostart = true;
this.connectionLost = false;
if ( typeof( window.heartbeatSettings ) == 'object' ) {
settings = $.extend( {}, window.heartbeatSettings );
// Add private vars
url = settings.ajaxurl || url;
delete settings.ajaxurl;
delete settings.nonce;
interval = settings.interval || 15; // default interval
delete settings.interval;
// The interval can be from 15 to 60 sec. and can be set temporarily to 5 sec.
if ( interval < 15 )
interval = 15;
else if ( interval > 60 )
interval = 60;
interval = interval * 1000;
// 'screenId' can be added from settings on the front-end where the JS global 'pagenow' is not set
screenId = screenId || settings.screenId || 'front';
delete settings.screenId;
// Add or overwrite public vars
$.extend( this, settings );
}
function time(s) {
if ( s )
return parseInt( (new Date()).getTime() / 1000 );
return (new Date()).getTime();
}
function isLocalFrame( frame ) {
var origin, src = frame.src;
if ( src && /^https?:\/\//.test( src ) ) {
origin = window.location.origin ? window.location.origin : window.location.protocol + '//' + window.location.host;
if ( src.indexOf( origin ) !== 0 )
return false;
}
try {
if ( frame.contentWindow.document )
return true;
} catch(e) {}
return false;
}
// Set error state and fire an event on XHR errors or timeout
function errorstate( error ) {
var trigger;
if ( error ) {
switch ( error ) {
case 'abort':
// do nothing
break;
case 'timeout':
// no response for 30 sec.
trigger = true;
break;
case 'parsererror':
case 'error':
case 'empty':
case 'unknown':
errorcount++;
if ( errorcount > 2 )
trigger = true;
break;
}
if ( trigger && ! self.connectionLost ) {
self.connectionLost = true;
$(document).trigger( 'heartbeat-connection-lost', [error] );
}
} else if ( self.connectionLost ) {
errorcount = 0;
self.connectionLost = false;
$(document).trigger( 'heartbeat-connection-restored' );
}
}
function connect() {
var send = {}, data, i, empty = true,
nonce = typeof window.heartbeatSettings == 'object' ? window.heartbeatSettings.nonce : '';
tick = time();
data = $.extend( {}, queue );
// Clear the data queue, anything added after this point will be send on the next tick
queue = {};
$(document).trigger( 'heartbeat-send', [data] );
for ( i in data ) {
if ( data.hasOwnProperty( i ) ) {
empty = false;
break;
}
}
// If nothing to send (nothing is expecting a response),
// schedule the next tick and bail
if ( empty && ! self.connectionLost ) {
connecting = false;
next();
return;
}
send.data = data;
send.interval = interval / 1000;
send._nonce = nonce;
send.action = 'heartbeat';
send.screen_id = screenId;
send.has_focus = hasFocus;
connecting = true;
self.xhr = $.ajax({
url: url,
type: 'post',
timeout: 30000, // throw an error of not completed after 30 sec.
data: send,
dataType: 'json'
}).done( function( response, textStatus, jqXHR ) {
var new_interval;
if ( ! response )
return errorstate( 'empty' );
// Clear error state
if ( self.connectionLost )
errorstate();
if ( response.nonces_expired ) {
$(document).trigger( 'heartbeat-nonces-expired' );
return;
}
// Change the interval from PHP
if ( response.heartbeat_interval ) {
new_interval = response.heartbeat_interval;
delete response.heartbeat_interval;
}
self.tick( response, textStatus, jqXHR );
// do this last, can trigger the next XHR if connection time > 5 sec. and new_interval == 'fast'
if ( new_interval )
self.interval.call( self, new_interval );
}).always( function() {
connecting = false;
next();
}).fail( function( jqXHR, textStatus, error ) {
errorstate( textStatus || 'unknown' );
self.error( jqXHR, textStatus, error );
});
};
function next() {
var delta = time() - tick, t = interval;
if ( ! running )
return;
if ( ! hasFocus ) {
t = 120000; // 2 min
} else if ( countdown > 0 && tempInterval ) {
t = tempInterval;
countdown--;
}
window.clearTimeout(beat);
if ( delta < t ) {
beat = window.setTimeout(
function(){
if ( running )
connect();
},
t - delta
);
} else {
connect();
}
}
function blurred() {
window.clearTimeout(winBlurTimeout);
window.clearTimeout(frameBlurTimeout);
winBlurTimeout = frameBlurTimeout = 0;
hasFocus = false;
}
function focused() {
window.clearTimeout(winBlurTimeout);
window.clearTimeout(frameBlurTimeout);
winBlurTimeout = frameBlurTimeout = 0;
isUserActive = time();
if ( hasFocus )
return;
hasFocus = true;
window.clearTimeout(beat);
if ( ! connecting )
next();
}
function setFrameEvents() {
$('iframe').each( function( i, frame ){
if ( ! isLocalFrame( frame ) )
return;
if ( $.data( frame, 'wp-heartbeat-focus' ) )
return;
$.data( frame, 'wp-heartbeat-focus', 1 );
$( frame.contentWindow ).on( 'focus.wp-heartbeat-focus', function(e) {
focused();
}).on('blur.wp-heartbeat-focus', function(e) {
setFrameEvents();
frameBlurTimeout = window.setTimeout( function(){ blurred(); }, 500 );
});
});
}
$(window).on( 'blur.wp-heartbeat-focus', function(e) {
setFrameEvents();
winBlurTimeout = window.setTimeout( function(){ blurred(); }, 500 );
}).on( 'focus.wp-heartbeat-focus', function() {
$('iframe').each( function( i, frame ) {
if ( !isLocalFrame( frame ) )
return;
$.removeData( frame, 'wp-heartbeat-focus' );
$( frame.contentWindow ).off( '.wp-heartbeat-focus' );
});
focused();
});
function userIsActive() {
userActiveEvents = false;
$(document).off( '.wp-heartbeat-active' );
$('iframe').each( function( i, frame ) {
if ( ! isLocalFrame( frame ) )
return;
$( frame.contentWindow ).off( '.wp-heartbeat-active' );
});
focused();
}
// Set 'hasFocus = true' if user is active and the window is in the background.
// Set 'hasFocus = false' if the user has been inactive (no mouse or keyboard activity) for 5 min. even when the window has focus.
function checkUserActive() {
var lastActive = isUserActive ? time() - isUserActive : 0;
// Throttle down when no mouse or keyboard activity for 5 min
if ( lastActive > 300000 && hasFocus )
blurred();
if ( ! userActiveEvents ) {
$(document).on( 'mouseover.wp-heartbeat-active keyup.wp-heartbeat-active', function(){ userIsActive(); } );
$('iframe').each( function( i, frame ) {
if ( ! isLocalFrame( frame ) )
return;
$( frame.contentWindow ).on( 'mouseover.wp-heartbeat-active keyup.wp-heartbeat-active', function(){ userIsActive(); } );
});
userActiveEvents = true;
}
}
// Check for user activity every 30 seconds.
window.setInterval( function(){ checkUserActive(); }, 30000 );
if ( this.autostart ) {
$(document).ready( function() {
// Start one tick (15 sec) after DOM ready
running = true;
tick = time();
next();
});
}
this.hasFocus = function() {
return hasFocus;
}
/**
* Get/Set the interval
*
* When setting to 'fast', the interval is 5 sec. for the next 30 ticks (for 2 min and 30 sec).
* If the window doesn't have focus, the interval slows down to 2 min.
*
* @param string speed Interval speed: 'fast' (5sec), 'standard' (15sec) default, 'slow' (60sec)
* @param string ticks Used with speed = 'fast', how many ticks before the speed reverts back
* @return int Current interval in seconds
*/
this.interval = function( speed, ticks ) {
var reset, seconds;
ticks = parseInt( ticks, 10 ) || 30;
ticks = ticks < 1 || ticks > 30 ? 30 : ticks;
if ( speed ) {
switch ( speed ) {
case 'fast':
seconds = 5;
countdown = ticks;
break;
case 'slow':
seconds = 60;
countdown = 0;
break;
case 'long-polling':
// Allow long polling, (experimental)
interval = 0;
return 0;
break;
default:
seconds = 15;
countdown = 0;
}
// Reset when the new interval value is lower than the current one
reset = seconds * 1000 < interval;
if ( countdown > 0 ) {
tempInterval = seconds * 1000;
} else {
interval = seconds * 1000;
tempInterval = 0;
}
if ( reset )
next();
}
if ( ! hasFocus )
return 120;
return tempInterval ? tempInterval / 1000 : interval / 1000;
};
// Start. Has no effect if heartbeat is already running
this.start = function() {
if ( running )
return false;
running = true;
connect();
return true;
};
// Stop. If a XHR is in progress, abort it
this.stop = function() {
if ( self.xhr && self.xhr.readyState != 4 )
self.xhr.abort();
// Reset the error state
errorstate();
running = false;
return true;
}
/**
* Enqueue data to send with the next XHR
*
* As the data is sent later, 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 dont_overwrite Whether to overwrite existing data in the queue.
* $return bool Whether the data was queued or not.
*/
this.enqueue = function( handle, data, dont_overwrite ) {
if ( handle ) {
if ( queue.hasOwnProperty( handle ) && dont_overwrite )
return false;
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 mixed The data queued with that handle or null
*/
this.isQueued = function( handle ) {
return queue[handle];
}
}
$.extend( Heartbeat.prototype, {
tick: function( data, textStatus, jqXHR ) {
$(document).trigger( 'heartbeat-tick', [data, textStatus, jqXHR] );
},
error: function( jqXHR, textStatus, error ) {
$(document).trigger( 'heartbeat-error', [jqXHR, textStatus, error] );
}
});
wp.heartbeat = new Heartbeat();
}(jQuery));