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