462 lines
12 KiB
JavaScript
462 lines
12 KiB
JavaScript
/**
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* Heartbeat API
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*
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* Note: this API is "experimental" meaning it will likely change a lot
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* in the next few releases based on feedback from 3.6.0. If you intend
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* to use it, please follow the development closely.
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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 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, and related tasks while a user is logged in.
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*
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* Available 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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* @since 3.6.0
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*/
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// Ensure the global `wp` object exists.
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window.wp = window.wp || {};
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(function($){
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var Heartbeat = function() {
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var self = this,
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running,
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beat,
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screenId = typeof pagenow != 'undefined' ? pagenow : '',
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url = typeof ajaxurl != 'undefined' ? ajaxurl : '',
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settings,
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tick = 0,
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queue = {},
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interval,
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connecting,
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countdown = 0,
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errorcount = 0,
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tempInterval,
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hasFocus = true,
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isUserActive,
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userActiveEvents,
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winBlurTimeout,
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frameBlurTimeout = -1,
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hasConnectionError = false;
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/**
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* Returns a boolean that's indicative of whether or not there is a connection error
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*
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* @returns boolean
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*/
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this.hasConnectionError = function() {
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return hasConnectionError;
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};
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if ( typeof( window.heartbeatSettings ) == 'object' ) {
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settings = $.extend( {}, window.heartbeatSettings );
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// Add private vars
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url = settings.ajaxurl || url;
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delete settings.ajaxurl;
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delete settings.nonce;
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interval = settings.interval || 15; // default interval
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delete settings.interval;
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// The interval can be from 15 to 60 sec. and can be set temporarily to 5 sec.
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if ( interval < 15 )
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interval = 15;
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else if ( interval > 60 )
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interval = 60;
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interval = interval * 1000;
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// 'screenId' can be added from settings on the front-end where the JS global 'pagenow' is not set
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screenId = screenId || settings.screenId || 'front';
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delete settings.screenId;
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// Add or overwrite public vars
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$.extend( this, settings );
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}
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function time(s) {
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if ( s )
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return parseInt( (new Date()).getTime() / 1000 );
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return (new Date()).getTime();
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}
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function isLocalFrame( frame ) {
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var origin, src = frame.src;
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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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try {
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if ( frame.contentWindow.document )
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return true;
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} catch(e) {}
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return false;
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}
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// Set error state and fire an event on XHR errors or timeout
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function errorstate( error ) {
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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 'parsererror':
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case 'error':
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case 'empty':
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case 'unknown':
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errorcount++;
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if ( errorcount > 2 )
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trigger = true;
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break;
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}
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if ( trigger && ! self.hasConnectionError() ) {
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hasConnectionError = true;
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$(document).trigger( 'heartbeat-connection-lost', [error] );
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}
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} else if ( self.hasConnectionError() ) {
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errorcount = 0;
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hasConnectionError = false;
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$(document).trigger( 'heartbeat-connection-restored' );
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}
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}
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function connect() {
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var send = {}, data, i, empty = true,
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nonce = typeof window.heartbeatSettings == 'object' ? window.heartbeatSettings.nonce : '';
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tick = time();
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data = $.extend( {}, queue );
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// Clear the data queue, anything added after this point will be send on the next tick
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queue = {};
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$(document).trigger( 'heartbeat-send', [data] );
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for ( i in data ) {
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if ( data.hasOwnProperty( i ) ) {
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empty = false;
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break;
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}
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}
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// If nothing to send (nothing is expecting a response),
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// schedule the next tick and bail
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if ( empty && ! self.hasConnectionError() ) {
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connecting = false;
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next();
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return;
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}
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send.data = data;
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send.interval = interval / 1000;
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send._nonce = nonce;
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send.action = 'heartbeat';
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send.screen_id = screenId;
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send.has_focus = hasFocus;
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connecting = true;
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self.xhr = $.ajax({
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url: url,
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type: 'post',
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timeout: 30000, // throw an error if not completed after 30 sec.
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data: send,
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dataType: 'json'
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}).done( function( response, textStatus, jqXHR ) {
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var new_interval;
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if ( ! response )
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return errorstate( 'empty' );
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// Clear error state
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if ( self.hasConnectionError() )
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errorstate();
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if ( response.nonces_expired ) {
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$(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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new_interval = response.heartbeat_interval;
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delete response.heartbeat_interval;
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}
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self.tick( response, textStatus, jqXHR );
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// do this last, can trigger the next XHR if connection time > 5 sec. and new_interval == 'fast'
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if ( new_interval )
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self.interval.call( self, new_interval );
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}).always( function() {
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connecting = false;
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next();
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}).fail( function( jqXHR, textStatus, error ) {
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errorstate( textStatus || 'unknown' );
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self.error( jqXHR, textStatus, error );
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});
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}
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function next() {
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var delta = time() - tick, t = interval;
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if ( ! running )
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return;
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if ( ! hasFocus ) {
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t = 100000; // 100 sec. Post locks expire after 120 sec.
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} else if ( countdown > 0 && tempInterval ) {
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t = tempInterval;
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countdown--;
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}
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window.clearTimeout(beat);
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if ( delta < t ) {
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beat = window.setTimeout(
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function(){
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if ( running )
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connect();
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},
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t - 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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function blurred() {
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window.clearTimeout(winBlurTimeout);
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window.clearTimeout(frameBlurTimeout);
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winBlurTimeout = frameBlurTimeout = 0;
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hasFocus = false;
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}
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function focused() {
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window.clearTimeout(winBlurTimeout);
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window.clearTimeout(frameBlurTimeout);
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winBlurTimeout = frameBlurTimeout = 0;
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isUserActive = time();
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if ( hasFocus )
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return;
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hasFocus = true;
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window.clearTimeout(beat);
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if ( ! connecting )
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next();
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}
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function setFrameEvents() {
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$('iframe').each( function( i, frame ){
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if ( ! isLocalFrame( frame ) )
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return;
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if ( $.data( frame, 'wp-heartbeat-focus' ) )
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return;
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$.data( frame, 'wp-heartbeat-focus', 1 );
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$( frame.contentWindow ).on( 'focus.wp-heartbeat-focus', function(e) {
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focused();
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}).on('blur.wp-heartbeat-focus', function(e) {
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setFrameEvents();
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frameBlurTimeout = window.setTimeout( function(){ blurred(); }, 500 );
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});
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});
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}
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$(window).on( 'blur.wp-heartbeat-focus', function(e) {
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setFrameEvents();
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winBlurTimeout = window.setTimeout( function(){ blurred(); }, 500 );
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}).on( 'focus.wp-heartbeat-focus', function() {
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$('iframe').each( function( i, frame ) {
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if ( !isLocalFrame( frame ) )
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return;
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$.removeData( frame, 'wp-heartbeat-focus' );
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$( frame.contentWindow ).off( '.wp-heartbeat-focus' );
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});
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focused();
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});
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function userIsActive() {
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userActiveEvents = false;
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$(document).off( '.wp-heartbeat-active' );
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$('iframe').each( function( i, frame ) {
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if ( ! isLocalFrame( frame ) )
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return;
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$( frame.contentWindow ).off( '.wp-heartbeat-active' );
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});
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focused();
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}
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// Set '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) for 5 min. even when the window has focus.
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function checkUserActive() {
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var lastActive = isUserActive ? time() - isUserActive : 0;
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// Throttle down when no mouse or keyboard activity for 5 min
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if ( lastActive > 300000 && hasFocus )
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blurred();
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if ( ! userActiveEvents ) {
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$(document).on( 'mouseover.wp-heartbeat-active keyup.wp-heartbeat-active', function(){ userIsActive(); } );
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$('iframe').each( function( i, frame ) {
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if ( ! isLocalFrame( frame ) )
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return;
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$( frame.contentWindow ).on( 'mouseover.wp-heartbeat-active keyup.wp-heartbeat-active', function(){ userIsActive(); } );
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});
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userActiveEvents = true;
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}
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}
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// Check for user activity every 30 seconds.
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window.setInterval( function(){ checkUserActive(); }, 30000 );
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$(document).ready( function() {
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// Start one tick (15 sec) after DOM ready
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running = true;
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tick = time();
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next();
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});
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this.hasFocus = function() {
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return hasFocus;
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};
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/**
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* Get/Set the interval
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*
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* When setting to 'fast', the interval is 5 sec. for the next 30 ticks (for 2 min and 30 sec).
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* If the window doesn't have focus, the interval slows down to 2 min.
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*
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* @param string speed Interval speed: 'fast' (5sec), 'standard' (15sec) default, 'slow' (60sec)
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* @param string ticks Used with speed = 'fast', how many ticks before the speed reverts back
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* @return int Current interval in seconds
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*/
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this.interval = function( speed, ticks ) {
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var reset, seconds;
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ticks = parseInt( ticks, 10 ) || 30;
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ticks = ticks < 1 || ticks > 30 ? 30 : ticks;
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if ( speed ) {
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switch ( speed ) {
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case 'fast':
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seconds = 5;
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countdown = ticks;
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break;
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case 'slow':
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seconds = 60;
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countdown = 0;
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break;
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case 'long-polling':
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// Allow long polling, (experimental)
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interval = 0;
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return 0;
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break;
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default:
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seconds = 15;
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countdown = 0;
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}
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// Reset when the new interval value is lower than the current one
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reset = seconds * 1000 < interval;
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if ( countdown > 0 ) {
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tempInterval = seconds * 1000;
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} else {
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interval = seconds * 1000;
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tempInterval = 0;
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}
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if ( reset )
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next();
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}
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if ( ! hasFocus )
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return 120;
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return tempInterval ? tempInterval / 1000 : interval / 1000;
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};
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/**
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* Enqueue data to send with the next XHR
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*
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* As the data is sent later, this function doesn't return the XHR response.
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* To see the response, use the custom jQuery event 'heartbeat-tick' on the document, example:
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* $(document).on( 'heartbeat-tick.myname', function( event, data, textStatus, jqXHR ) {
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* // code
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* });
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* If the same 'handle' is used more than once, the data is not overwritten when the third argument is 'true'.
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* Use wp.heartbeat.isQueued('handle') to see if any data is already queued for that handle.
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*
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* $param string handle Unique handle for the data. The handle is used in PHP to receive the data.
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* $param mixed data The data to send.
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* $param bool dont_overwrite Whether to overwrite existing data in the queue.
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* $return bool Whether the data was queued or not.
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*/
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this.enqueue = function( handle, data, dont_overwrite ) {
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if ( handle ) {
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if ( queue.hasOwnProperty( handle ) && dont_overwrite )
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return false;
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queue[handle] = data;
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return true;
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}
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return false;
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};
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/**
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* Check if data with a particular handle is queued
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*
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* $param string handle The handle for the data
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* $return mixed The data queued with that handle or null
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*/
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this.isQueued = function( handle ) {
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return queue[handle];
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};
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};
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$.extend( Heartbeat.prototype, {
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tick: function( data, textStatus, jqXHR ) {
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$(document).trigger( 'heartbeat-tick', [data, textStatus, jqXHR] );
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},
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error: function( jqXHR, textStatus, error ) {
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$(document).trigger( 'heartbeat-error', [jqXHR, textStatus, error] );
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}
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});
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wp.heartbeat = new Heartbeat();
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}(jQuery));
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