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queuehandler.js
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/* global pm, wpcom_reblog, JSON */
var jetpackLikesWidgetBatch = [];
var jetpackLikesMasterReady = false;
// Due to performance problems on pages with a large number of widget iframes that need to be loaded,
// we are limiting the processing at any instant to unloaded widgets that are currently in viewport,
// plus this constant that will allow processing of widgets above and bellow the current fold.
// This aim of it is to improve the UX and hide the transition from unloaded to loaded state from users.
var jetpackLikesLookAhead = 2000; // pixels
// Keeps track of loaded comment likes widget so we can unload them when they are scrolled out of view.
var jetpackCommentLikesLoadedWidgets = [];
function JetpackLikesPostMessage(message, target ) {
if ( 'string' === typeof message ){
try {
message = JSON.parse( message );
} catch(e) {
return;
}
}
pm( {
target: target,
type: 'likesMessage',
data: message,
origin: '*'
} );
}
function JetpackLikesBatchHandler() {
var requests = [];
jQuery( 'div.jetpack-likes-widget-unloaded' ).each( function() {
if ( jetpackLikesWidgetBatch.indexOf( this.id ) > -1 ) {
return;
}
if ( ! jetpackIsScrolledIntoView( this ) ) {
return;
}
jetpackLikesWidgetBatch.push( this.id );
var regex = /like-(post|comment)-wrapper-(\d+)-(\d+)-(\w+)/,
match = regex.exec( this.id ),
info;
if ( ! match || match.length !== 5 ) {
return;
}
info = {
blog_id: match[2],
width: this.width
};
if ( 'post' === match[1] ) {
info.post_id = match[3];
} else if ( 'comment' === match[1] ) {
info.comment_id = match[3];
}
info.obj_id = match[4];
requests.push( info );
});
if ( requests.length > 0 ) {
JetpackLikesPostMessage( { event: 'initialBatch', requests: requests }, window.frames['likes-master'] );
}
}
function JetpackLikesMessageListener( event, message ) {
var allowedOrigin, $container, $list, offset, rowLength, height, scrollbarWidth;
if ( 'undefined' === typeof event.event ) {
return;
}
// We only allow messages from one origin
allowedOrigin = 'https://widgets.wp.com';
if ( allowedOrigin !== message.origin ) {
return;
}
switch ( event.event ) {
case 'masterReady':
jQuery( document ).ready( function() {
jetpackLikesMasterReady = true;
var stylesData = {
event: 'injectStyles'
},
$sdTextColor = jQuery( '.sd-text-color' ),
$sdLinkColor = jQuery( '.sd-link-color' );
if ( jQuery( 'iframe.admin-bar-likes-widget' ).length > 0 ) {
JetpackLikesPostMessage( { event: 'adminBarEnabled' }, window.frames[ 'likes-master' ] );
stylesData.adminBarStyles = {
background: jQuery( '#wpadminbar .quicklinks li#wp-admin-bar-wpl-like > a' ).css( 'background' ),
isRtl: ( 'rtl' === jQuery( '#wpadminbar' ).css( 'direction' ) )
};
}
if ( ! window.addEventListener ) {
jQuery( '#wp-admin-bar-admin-bar-likes-widget' ).hide();
}
stylesData.textStyles = {
color: $sdTextColor.css( 'color' ),
fontFamily: $sdTextColor.css( 'font-family' ),
fontSize: $sdTextColor.css( 'font-size' ),
direction: $sdTextColor.css( 'direction' ),
fontWeight: $sdTextColor.css( 'font-weight' ),
fontStyle: $sdTextColor.css( 'font-style' ),
textDecoration: $sdTextColor.css( 'text-decoration' )
};
stylesData.linkStyles = {
color: $sdLinkColor.css( 'color' ),
fontFamily: $sdLinkColor.css( 'font-family' ),
fontSize: $sdLinkColor.css( 'font-size' ),
textDecoration: $sdLinkColor.css( 'text-decoration' ),
fontWeight: $sdLinkColor.css( 'font-weight' ),
fontStyle: $sdLinkColor.css( 'font-style' )
};
JetpackLikesPostMessage( stylesData, window.frames[ 'likes-master' ] );
JetpackLikesBatchHandler();
} );
break;
case 'showLikeWidget':
jQuery( '#' + event.id + ' .likes-widget-placeholder' ).fadeOut( 'fast' );
break;
case 'showCommentLikeWidget':
jQuery( '#' + event.id + ' .likes-widget-placeholder' ).fadeOut( 'fast' );
break;
case 'killCommentLikes':
// If kill switch for comment likes is enabled remove all widgets wrappers and `Loading...` placeholders.
jQuery( '.jetpack-comment-likes-widget-wrapper' ).remove();
break;
case 'clickReblogFlair':
wpcom_reblog.toggle_reblog_box_flair( event.obj_id );
break;
case 'showOtherGravatars':
$container = jQuery( '#likes-other-gravatars' );
$list = $container.find( 'ul' );
$container.hide();
$list.html( '' );
$container.find( '.likes-text span' ).text( event.total );
jQuery.each( event.likers, function( i, liker ) {
var element;
if ( 'http' !== liker.profile_URL.substr( 0, 4 ) ) {
// We only display gravatars with http or https schema
return;
}
element = jQuery( '<li><a><img /></a></li>' );
element.addClass( liker.css_class );
element.find( 'a' ).
attr( {
href: liker.profile_URL,
rel: 'nofollow',
target: '_parent'
} ).
addClass( 'wpl-liker' );
element.find( 'img' ).
attr( {
src: liker.avatar_URL,
alt: liker.name
} ).
css( {
width: '30px',
height: '30px',
paddingRight: '3px'
} );
$list.append( element );
} );
offset = jQuery( '[name=\'' + event.parent + '\']' ).offset();
$container.css( 'left', offset.left + event.position.left - 10 + 'px' );
$container.css( 'top', offset.top + event.position.top - 33 + 'px' );
rowLength = Math.floor( event.width / 37 );
height = ( Math.ceil( event.likers.length / rowLength ) * 37 ) + 13;
if ( height > 204 ) {
height = 204;
}
$container.css( 'height', height + 'px' );
$container.css( 'width', rowLength * 37 - 7 + 'px' );
$list.css( 'width', rowLength * 37 + 'px' );
$container.fadeIn( 'slow' );
scrollbarWidth = $list[0].offsetWidth - $list[0].clientWidth;
if ( scrollbarWidth > 0 ) {
$container.width( $container.width() + scrollbarWidth );
$list.width( $list.width() + scrollbarWidth );
}
}
}
pm.bind( 'likesMessage', JetpackLikesMessageListener );
jQuery( document ).click( function( e ) {
var $container = jQuery( '#likes-other-gravatars' );
if ( $container.has( e.target ).length === 0 ) {
$container.fadeOut( 'slow' );
}
});
function JetpackLikesWidgetQueueHandler() {
var wrapperID;
if ( ! jetpackLikesMasterReady ) {
setTimeout( JetpackLikesWidgetQueueHandler, 500 );
return;
}
// Restore widgets to initial unloaded state when they are scrolled out of view.
jetpackUnloadScrolledOutWidgets();
var unloadedWidgetsInView = jetpackGetUnloadedWidgetsInView();
if ( unloadedWidgetsInView.length > 0 ) {
// Grab any unloaded widgets for a batch request
JetpackLikesBatchHandler();
}
for ( var i=0, length = unloadedWidgetsInView.length; i <= length - 1; i++ ) {
wrapperID = unloadedWidgetsInView[i].id;
if ( ! wrapperID ){
continue;
}
jetpackLoadLikeWidgetIframe( wrapperID );
}
}
function jetpackLoadLikeWidgetIframe( wrapperID ) {
var $wrapper;
if ( 'undefined' === typeof wrapperID ) {
return;
}
$wrapper = jQuery( '#' + wrapperID );
$wrapper.find( 'iframe' ).remove();
var placeholder = $wrapper.find( '.likes-widget-placeholder' );
// Post like iframe
if ( placeholder.hasClass( 'post-likes-widget-placeholder' ) ) {
var postLikesFrame = document.createElement( 'iframe' );
postLikesFrame['class'] = 'post-likes-widget jetpack-likes-widget';
postLikesFrame.name = $wrapper.data( 'name' );
postLikesFrame.src = $wrapper.data( 'src' );
postLikesFrame.height = '18px';
postLikesFrame.width = '200px';
postLikesFrame.frameBorder = '0';
postLikesFrame.scrolling = 'no';
if ( $wrapper.hasClass( 'slim-likes-widget' ) ) {
postLikesFrame.height = '22px';
postLikesFrame.width = '68px';
postLikesFrame.scrolling = 'no';
} else {
postLikesFrame.height = '55px';
postLikesFrame.width = '100%';
}
placeholder.after( postLikesFrame );
}
// Comment like iframe
if ( placeholder.hasClass( 'comment-likes-widget-placeholder' ) ) {
var commentLikesFrame = document.createElement( 'iframe' );
commentLikesFrame['class'] = 'comment-likes-widget-frame jetpack-likes-widget-frame';
commentLikesFrame.name = $wrapper.data( 'name' );
commentLikesFrame.src = $wrapper.data( 'src' );
commentLikesFrame.height = '18px';
commentLikesFrame.width = '200px';
commentLikesFrame.frameBorder = '0';
commentLikesFrame.scrolling = 'no';
$wrapper.find( '.comment-like-feedback' ).after( commentLikesFrame );
jetpackCommentLikesLoadedWidgets.push( commentLikesFrame );
}
$wrapper.removeClass( 'jetpack-likes-widget-unloaded' ).addClass( 'jetpack-likes-widget-loading' );
$wrapper.find( 'iframe' ).load( function( e ) {
var $iframe = jQuery( e.target );
JetpackLikesPostMessage( { event: 'loadLikeWidget', name: $iframe.attr( 'name' ), width: $iframe.width() }, window.frames[ 'likes-master' ] );
$wrapper.removeClass( 'jetpack-likes-widget-loading' ).addClass( 'jetpack-likes-widget-loaded' );
if ( $wrapper.hasClass( 'slim-likes-widget' ) ) {
$wrapper.find( 'iframe' ).Jetpack( 'resizeable' );
}
});
}
function jetpackGetUnloadedWidgetsInView() {
var $unloadedWidgets = jQuery( 'div.jetpack-likes-widget-unloaded' );
return $unloadedWidgets.filter( function() {
return jetpackIsScrolledIntoView( this );
} );
}
function jetpackIsScrolledIntoView( element ) {
var top = element.getBoundingClientRect().top;
var bottom = element.getBoundingClientRect().bottom;
// Allow some slack above and bellow the fold with jetpackLikesLookAhead,
// with the aim of hiding the transition from unloaded to loaded widget from users.
return ( top + jetpackLikesLookAhead >= 0 ) && ( bottom <= window.innerHeight + jetpackLikesLookAhead );
}
function jetpackUnloadScrolledOutWidgets() {
for ( var i = jetpackCommentLikesLoadedWidgets.length - 1; i >= 0; i-- ) {
var currentWidgetIframe = jetpackCommentLikesLoadedWidgets[ i ];
if ( ! jetpackIsScrolledIntoView( currentWidgetIframe ) ) {
var $widgetWrapper = jQuery( currentWidgetIframe ).parent().parent();
// Restore parent class to 'unloaded' so this widget can be picked up by queue manager again if needed.
$widgetWrapper
.removeClass( 'jetpack-likes-widget-loaded jetpack-likes-widget-loading' )
.addClass( 'jetpack-likes-widget-unloaded' );
// Bring back the loading placeholder into view.
$widgetWrapper.children( '.comment-likes-widget-placeholder' ).fadeIn();
// Remove it from the list of loaded widgets.
jetpackCommentLikesLoadedWidgets.splice( i, 1 );
// Remove comment like widget iFrame.
jQuery( currentWidgetIframe ).remove();
}
}
}
var jetpackWidgetsDelayedExec = function( after, fn ) {
var timer;
return function() {
timer && clearTimeout( timer );
timer = setTimeout( fn, after );
};
};
var jetpackOnScrollStopped = jetpackWidgetsDelayedExec( 250, JetpackLikesWidgetQueueHandler );
// Load initial batch of widgets, prior to any scrolling events.
JetpackLikesWidgetQueueHandler();
// Add event listener to execute queue handler after scroll.
window.addEventListener( 'scroll', jetpackOnScrollStopped, true );