queuehandler.js
| 1 | /* global pm, wpcom_reblog, JSON */ |
| 2 | |
| 3 | var jetpackLikesWidgetBatch = []; |
| 4 | var jetpackLikesMasterReady = false; |
| 5 | |
| 6 | // Due to performance problems on pages with a large number of widget iframes that need to be loaded, |
| 7 | // we are limiting the processing at any instant to unloaded widgets that are currently in viewport, |
| 8 | // plus this constant that will allow processing of widgets above and bellow the current fold. |
| 9 | // This aim of it is to improve the UX and hide the transition from unloaded to loaded state from users. |
| 10 | var jetpackLikesLookAhead = 2000; // pixels |
| 11 | |
| 12 | // Keeps track of loaded comment likes widget so we can unload them when they are scrolled out of view. |
| 13 | var jetpackCommentLikesLoadedWidgets = []; |
| 14 | |
| 15 | function JetpackLikesPostMessage(message, target ) { |
| 16 | if ( 'string' === typeof message ){ |
| 17 | try { |
| 18 | message = JSON.parse( message ); |
| 19 | } catch(e) { |
| 20 | return; |
| 21 | } |
| 22 | } |
| 23 | |
| 24 | pm( { |
| 25 | target: target, |
| 26 | type: 'likesMessage', |
| 27 | data: message, |
| 28 | origin: '*' |
| 29 | } ); |
| 30 | } |
| 31 | |
| 32 | function JetpackLikesBatchHandler() { |
| 33 | var requests = []; |
| 34 | jQuery( 'div.jetpack-likes-widget-unloaded' ).each( function() { |
| 35 | if ( jetpackLikesWidgetBatch.indexOf( this.id ) > -1 ) { |
| 36 | return; |
| 37 | } |
| 38 | |
| 39 | if ( ! jetpackIsScrolledIntoView( this ) ) { |
| 40 | return; |
| 41 | } |
| 42 | |
| 43 | jetpackLikesWidgetBatch.push( this.id ); |
| 44 | |
| 45 | var regex = /like-(post|comment)-wrapper-(\d+)-(\d+)-(\w+)/, |
| 46 | match = regex.exec( this.id ), |
| 47 | info; |
| 48 | |
| 49 | if ( ! match || match.length !== 5 ) { |
| 50 | return; |
| 51 | } |
| 52 | |
| 53 | info = { |
| 54 | blog_id: match[2], |
| 55 | width: this.width |
| 56 | }; |
| 57 | |
| 58 | if ( 'post' === match[1] ) { |
| 59 | info.post_id = match[3]; |
| 60 | } else if ( 'comment' === match[1] ) { |
| 61 | info.comment_id = match[3]; |
| 62 | } |
| 63 | |
| 64 | info.obj_id = match[4]; |
| 65 | |
| 66 | requests.push( info ); |
| 67 | }); |
| 68 | |
| 69 | if ( requests.length > 0 ) { |
| 70 | JetpackLikesPostMessage( { event: 'initialBatch', requests: requests }, window.frames['likes-master'] ); |
| 71 | } |
| 72 | } |
| 73 | |
| 74 | function JetpackLikesMessageListener( event, message ) { |
| 75 | var allowedOrigin, $container, $list, offset, rowLength, height, scrollbarWidth; |
| 76 | |
| 77 | if ( 'undefined' === typeof event.event ) { |
| 78 | return; |
| 79 | } |
| 80 | |
| 81 | // We only allow messages from one origin |
| 82 | allowedOrigin = 'https://widgets.wp.com'; |
| 83 | if ( allowedOrigin !== message.origin ) { |
| 84 | return; |
| 85 | } |
| 86 | |
| 87 | switch ( event.event ) { |
| 88 | case 'masterReady': |
| 89 | jQuery( document ).ready( function() { |
| 90 | jetpackLikesMasterReady = true; |
| 91 | |
| 92 | var stylesData = { |
| 93 | event: 'injectStyles' |
| 94 | }, |
| 95 | $sdTextColor = jQuery( '.sd-text-color' ), |
| 96 | $sdLinkColor = jQuery( '.sd-link-color' ); |
| 97 | |
| 98 | if ( jQuery( 'iframe.admin-bar-likes-widget' ).length > 0 ) { |
| 99 | JetpackLikesPostMessage( { event: 'adminBarEnabled' }, window.frames[ 'likes-master' ] ); |
| 100 | |
| 101 | stylesData.adminBarStyles = { |
| 102 | background: jQuery( '#wpadminbar .quicklinks li#wp-admin-bar-wpl-like > a' ).css( 'background' ), |
| 103 | isRtl: ( 'rtl' === jQuery( '#wpadminbar' ).css( 'direction' ) ) |
| 104 | }; |
| 105 | } |
| 106 | |
| 107 | if ( ! window.addEventListener ) { |
| 108 | jQuery( '#wp-admin-bar-admin-bar-likes-widget' ).hide(); |
| 109 | } |
| 110 | |
| 111 | stylesData.textStyles = { |
| 112 | color: $sdTextColor.css( 'color' ), |
| 113 | fontFamily: $sdTextColor.css( 'font-family' ), |
| 114 | fontSize: $sdTextColor.css( 'font-size' ), |
| 115 | direction: $sdTextColor.css( 'direction' ), |
| 116 | fontWeight: $sdTextColor.css( 'font-weight' ), |
| 117 | fontStyle: $sdTextColor.css( 'font-style' ), |
| 118 | textDecoration: $sdTextColor.css( 'text-decoration' ) |
| 119 | }; |
| 120 | |
| 121 | stylesData.linkStyles = { |
| 122 | color: $sdLinkColor.css( 'color' ), |
| 123 | fontFamily: $sdLinkColor.css( 'font-family' ), |
| 124 | fontSize: $sdLinkColor.css( 'font-size' ), |
| 125 | textDecoration: $sdLinkColor.css( 'text-decoration' ), |
| 126 | fontWeight: $sdLinkColor.css( 'font-weight' ), |
| 127 | fontStyle: $sdLinkColor.css( 'font-style' ) |
| 128 | }; |
| 129 | |
| 130 | JetpackLikesPostMessage( stylesData, window.frames[ 'likes-master' ] ); |
| 131 | |
| 132 | JetpackLikesBatchHandler(); |
| 133 | } ); |
| 134 | |
| 135 | break; |
| 136 | |
| 137 | case 'showLikeWidget': |
| 138 | jQuery( '#' + event.id + ' .likes-widget-placeholder' ).fadeOut( 'fast' ); |
| 139 | break; |
| 140 | |
| 141 | case 'showCommentLikeWidget': |
| 142 | jQuery( '#' + event.id + ' .likes-widget-placeholder' ).fadeOut( 'fast' ); |
| 143 | break; |
| 144 | |
| 145 | case 'killCommentLikes': |
| 146 | // If kill switch for comment likes is enabled remove all widgets wrappers and `Loading...` placeholders. |
| 147 | jQuery( '.jetpack-comment-likes-widget-wrapper' ).remove(); |
| 148 | break; |
| 149 | |
| 150 | case 'clickReblogFlair': |
| 151 | wpcom_reblog.toggle_reblog_box_flair( event.obj_id ); |
| 152 | break; |
| 153 | |
| 154 | case 'showOtherGravatars': |
| 155 | $container = jQuery( '#likes-other-gravatars' ); |
| 156 | $list = $container.find( 'ul' ); |
| 157 | |
| 158 | $container.hide(); |
| 159 | $list.html( '' ); |
| 160 | |
| 161 | $container.find( '.likes-text span' ).text( event.total ); |
| 162 | |
| 163 | jQuery.each( event.likers, function( i, liker ) { |
| 164 | var element; |
| 165 | |
| 166 | if ( 'http' !== liker.profile_URL.substr( 0, 4 ) ) { |
| 167 | // We only display gravatars with http or https schema |
| 168 | return; |
| 169 | } |
| 170 | |
| 171 | element = jQuery( '<li><a><img /></a></li>' ); |
| 172 | element.addClass( liker.css_class ); |
| 173 | |
| 174 | element.find( 'a' ). |
| 175 | attr( { |
| 176 | href: liker.profile_URL, |
| 177 | rel: 'nofollow', |
| 178 | target: '_parent' |
| 179 | } ). |
| 180 | addClass( 'wpl-liker' ); |
| 181 | |
| 182 | element.find( 'img' ). |
| 183 | attr( { |
| 184 | src: liker.avatar_URL, |
| 185 | alt: liker.name |
| 186 | } ). |
| 187 | css( { |
| 188 | width: '30px', |
| 189 | height: '30px', |
| 190 | paddingRight: '3px' |
| 191 | } ); |
| 192 | |
| 193 | $list.append( element ); |
| 194 | } ); |
| 195 | |
| 196 | offset = jQuery( '[name=\'' + event.parent + '\']' ).offset(); |
| 197 | |
| 198 | $container.css( 'left', offset.left + event.position.left - 10 + 'px' ); |
| 199 | $container.css( 'top', offset.top + event.position.top - 33 + 'px' ); |
| 200 | |
| 201 | rowLength = Math.floor( event.width / 37 ); |
| 202 | height = ( Math.ceil( event.likers.length / rowLength ) * 37 ) + 13; |
| 203 | if ( height > 204 ) { |
| 204 | height = 204; |
| 205 | } |
| 206 | |
| 207 | $container.css( 'height', height + 'px' ); |
| 208 | $container.css( 'width', rowLength * 37 - 7 + 'px' ); |
| 209 | |
| 210 | $list.css( 'width', rowLength * 37 + 'px' ); |
| 211 | |
| 212 | $container.fadeIn( 'slow' ); |
| 213 | |
| 214 | scrollbarWidth = $list[0].offsetWidth - $list[0].clientWidth; |
| 215 | if ( scrollbarWidth > 0 ) { |
| 216 | $container.width( $container.width() + scrollbarWidth ); |
| 217 | $list.width( $list.width() + scrollbarWidth ); |
| 218 | } |
| 219 | } |
| 220 | } |
| 221 | |
| 222 | pm.bind( 'likesMessage', JetpackLikesMessageListener ); |
| 223 | |
| 224 | jQuery( document ).click( function( e ) { |
| 225 | var $container = jQuery( '#likes-other-gravatars' ); |
| 226 | |
| 227 | if ( $container.has( e.target ).length === 0 ) { |
| 228 | $container.fadeOut( 'slow' ); |
| 229 | } |
| 230 | }); |
| 231 | |
| 232 | function JetpackLikesWidgetQueueHandler() { |
| 233 | var wrapperID; |
| 234 | |
| 235 | if ( ! jetpackLikesMasterReady ) { |
| 236 | setTimeout( JetpackLikesWidgetQueueHandler, 500 ); |
| 237 | return; |
| 238 | } |
| 239 | |
| 240 | // Restore widgets to initial unloaded state when they are scrolled out of view. |
| 241 | jetpackUnloadScrolledOutWidgets(); |
| 242 | |
| 243 | var unloadedWidgetsInView = jetpackGetUnloadedWidgetsInView(); |
| 244 | |
| 245 | if ( unloadedWidgetsInView.length > 0 ) { |
| 246 | // Grab any unloaded widgets for a batch request |
| 247 | JetpackLikesBatchHandler(); |
| 248 | } |
| 249 | |
| 250 | for ( var i=0, length = unloadedWidgetsInView.length; i <= length - 1; i++ ) { |
| 251 | wrapperID = unloadedWidgetsInView[i].id; |
| 252 | |
| 253 | if ( ! wrapperID ){ |
| 254 | continue; |
| 255 | } |
| 256 | |
| 257 | jetpackLoadLikeWidgetIframe( wrapperID ); |
| 258 | } |
| 259 | } |
| 260 | |
| 261 | function jetpackLoadLikeWidgetIframe( wrapperID ) { |
| 262 | var $wrapper; |
| 263 | |
| 264 | if ( 'undefined' === typeof wrapperID ) { |
| 265 | return; |
| 266 | } |
| 267 | |
| 268 | $wrapper = jQuery( '#' + wrapperID ); |
| 269 | $wrapper.find( 'iframe' ).remove(); |
| 270 | |
| 271 | var placeholder = $wrapper.find( '.likes-widget-placeholder' ); |
| 272 | |
| 273 | // Post like iframe |
| 274 | if ( placeholder.hasClass( 'post-likes-widget-placeholder' ) ) { |
| 275 | var postLikesFrame = document.createElement( 'iframe' ); |
| 276 | |
| 277 | postLikesFrame['class'] = 'post-likes-widget jetpack-likes-widget'; |
| 278 | postLikesFrame.name = $wrapper.data( 'name' ); |
| 279 | postLikesFrame.src = $wrapper.data( 'src' ); |
| 280 | postLikesFrame.height = '18px'; |
| 281 | postLikesFrame.width = '200px'; |
| 282 | postLikesFrame.frameBorder = '0'; |
| 283 | postLikesFrame.scrolling = 'no'; |
| 284 | |
| 285 | if ( $wrapper.hasClass( 'slim-likes-widget' ) ) { |
| 286 | postLikesFrame.height = '22px'; |
| 287 | postLikesFrame.width = '68px'; |
| 288 | postLikesFrame.scrolling = 'no'; |
| 289 | } else { |
| 290 | postLikesFrame.height = '55px'; |
| 291 | postLikesFrame.width = '100%'; |
| 292 | } |
| 293 | |
| 294 | placeholder.after( postLikesFrame ); |
| 295 | } |
| 296 | |
| 297 | // Comment like iframe |
| 298 | if ( placeholder.hasClass( 'comment-likes-widget-placeholder' ) ) { |
| 299 | var commentLikesFrame = document.createElement( 'iframe' ); |
| 300 | |
| 301 | commentLikesFrame['class'] = 'comment-likes-widget-frame jetpack-likes-widget-frame'; |
| 302 | commentLikesFrame.name = $wrapper.data( 'name' ); |
| 303 | commentLikesFrame.src = $wrapper.data( 'src' ); |
| 304 | commentLikesFrame.height = '18px'; |
| 305 | commentLikesFrame.width = '100%'; |
| 306 | commentLikesFrame.frameBorder = '0'; |
| 307 | commentLikesFrame.scrolling = 'no'; |
| 308 | |
| 309 | $wrapper.find( '.comment-like-feedback' ).after( commentLikesFrame ); |
| 310 | |
| 311 | jetpackCommentLikesLoadedWidgets.push( commentLikesFrame ); |
| 312 | } |
| 313 | |
| 314 | $wrapper.removeClass( 'jetpack-likes-widget-unloaded' ).addClass( 'jetpack-likes-widget-loading' ); |
| 315 | |
| 316 | $wrapper.find( 'iframe' ).load( function( e ) { |
| 317 | var $iframe = jQuery( e.target ); |
| 318 | |
| 319 | JetpackLikesPostMessage( { event: 'loadLikeWidget', name: $iframe.attr( 'name' ), width: $iframe.width() }, window.frames[ 'likes-master' ] ); |
| 320 | |
| 321 | $wrapper.removeClass( 'jetpack-likes-widget-loading' ).addClass( 'jetpack-likes-widget-loaded' ); |
| 322 | |
| 323 | if ( $wrapper.hasClass( 'slim-likes-widget' ) ) { |
| 324 | $wrapper.find( 'iframe' ).Jetpack( 'resizeable' ); |
| 325 | } |
| 326 | }); |
| 327 | } |
| 328 | |
| 329 | function jetpackGetUnloadedWidgetsInView() { |
| 330 | var $unloadedWidgets = jQuery( 'div.jetpack-likes-widget-unloaded' ); |
| 331 | |
| 332 | return $unloadedWidgets.filter( function() { |
| 333 | return jetpackIsScrolledIntoView( this ); |
| 334 | } ); |
| 335 | } |
| 336 | |
| 337 | function jetpackIsScrolledIntoView( element ) { |
| 338 | var top = element.getBoundingClientRect().top; |
| 339 | var bottom = element.getBoundingClientRect().bottom; |
| 340 | |
| 341 | // Allow some slack above and bellow the fold with jetpackLikesLookAhead, |
| 342 | // with the aim of hiding the transition from unloaded to loaded widget from users. |
| 343 | return ( top + jetpackLikesLookAhead >= 0 ) && ( bottom <= window.innerHeight + jetpackLikesLookAhead ); |
| 344 | } |
| 345 | |
| 346 | function jetpackUnloadScrolledOutWidgets() { |
| 347 | for ( var i = jetpackCommentLikesLoadedWidgets.length - 1; i >= 0; i-- ) { |
| 348 | var currentWidgetIframe = jetpackCommentLikesLoadedWidgets[ i ]; |
| 349 | |
| 350 | if ( ! jetpackIsScrolledIntoView( currentWidgetIframe ) ) { |
| 351 | var $widgetWrapper = jQuery( currentWidgetIframe ).parent().parent(); |
| 352 | |
| 353 | // Restore parent class to 'unloaded' so this widget can be picked up by queue manager again if needed. |
| 354 | $widgetWrapper |
| 355 | .removeClass( 'jetpack-likes-widget-loaded jetpack-likes-widget-loading' ) |
| 356 | .addClass( 'jetpack-likes-widget-unloaded' ); |
| 357 | |
| 358 | // Bring back the loading placeholder into view. |
| 359 | $widgetWrapper.children( '.comment-likes-widget-placeholder' ).fadeIn(); |
| 360 | |
| 361 | // Remove it from the list of loaded widgets. |
| 362 | jetpackCommentLikesLoadedWidgets.splice( i, 1 ); |
| 363 | |
| 364 | // Remove comment like widget iFrame. |
| 365 | jQuery( currentWidgetIframe ).remove(); |
| 366 | } |
| 367 | } |
| 368 | } |
| 369 | |
| 370 | var jetpackWidgetsDelayedExec = function( after, fn ) { |
| 371 | var timer; |
| 372 | return function() { |
| 373 | timer && clearTimeout( timer ); |
| 374 | timer = setTimeout( fn, after ); |
| 375 | }; |
| 376 | }; |
| 377 | |
| 378 | var jetpackOnScrollStopped = jetpackWidgetsDelayedExec( 250, JetpackLikesWidgetQueueHandler ); |
| 379 | |
| 380 | // Load initial batch of widgets, prior to any scrolling events. |
| 381 | JetpackLikesWidgetQueueHandler(); |
| 382 | |
| 383 | // Add event listener to execute queue handler after scroll. |
| 384 | window.addEventListener( 'scroll', jetpackOnScrollStopped, true ); |
| 385 |