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Editing: related-posts.js

/* globals related_posts_js_options */

/**
 * Load related posts
 */
( function () {
	'use strict';

var jprp = {
		response: null,

/**
		 * Utility get related posts JSON endpoint from URLs
		 *
		 * @param  {string} URL (optional)
		 * @return {string} Endpoint URL
		 */
		getEndpointURL: function ( URL ) {
			var locationObject,
				is_customizer =
					'undefined' !== typeof wp &&
					wp.customize &&
					wp.customize.settings &&
					wp.customize.settings.url &&
					wp.customize.settings.url.self;

// If we're in Customizer, write the correct URL.
			if ( is_customizer ) {
				locationObject = document.createElement( 'a' );
				locationObject.href = wp.customize.settings.url.self;
			} else {
				locationObject = document.location;
			}

if ( 'string' === typeof URL && URL.match( /^https?:\/\// ) ) {
				locationObject = document.createElement( 'a' );
				locationObject.href = URL;
			}

var args = 'relatedposts=1';
			var relatedPosts = document.querySelector( '#jp-relatedposts' );

if ( ! relatedPosts ) {
				return false;
			}

if ( relatedPosts.hasAttribute( 'data-exclude' ) ) {
				args += '&relatedposts_exclude=' + relatedPosts.getAttribute( 'data-exclude' );
			}

if ( is_customizer ) {
				args += '&jetpackrpcustomize=1';
			}

var pathname = locationObject.pathname;
			if ( '/' !== pathname[ 0 ] ) {
				pathname = '/' + pathname;
			}

if ( '' === locationObject.search ) {
				return pathname + '?' + args;
			} else {
				return pathname + locationObject.search + '&' + args;
			}
		},

getAnchor: function ( post, classNames ) {
			var anchorTitle = post.title;
			var anchor = document.createElement( 'a' );
			anchor.setAttribute( 'class', classNames );
			anchor.setAttribute( 'href', post.url );
			anchor.setAttribute( 'title', anchorTitle );
			anchor.setAttribute( 'data-origin', post.url_meta.origin );
			anchor.setAttribute( 'data-position', post.url_meta.position );

if ( '' !== post.rel ) {
				anchor.setAttribute( 'rel', post.rel );
			}

var div = document.createElement( 'div' );
			div.appendChild( anchor );

var anchorHTML = div.innerHTML;
			return [ anchorHTML.substring( 0, anchorHTML.length - 4 ), '</a>' ];
		},

generateMinimalHtml: function ( posts, options ) {
			var self = this;
			var html = '';

posts.forEach( function ( post, index ) {
				var anchor = self.getAnchor( post, 'jp-relatedposts-post-a' );
				var classes = 'jp-relatedposts-post jp-relatedposts-post' + index;

if ( post.classes.length > 0 ) {
					classes += ' ' + post.classes.join( ' ' );
				}

html +=
					'<p class="' +
					classes +
					'" data-post-id="' +
					post.id +
					'" data-post-format="' +
					post.format +
					'">';
				html +=
					'<span class="jp-relatedposts-post-title">' +
					anchor[ 0 ] +
					post.title +
					anchor[ 1 ] +
					'</span>';
				if ( options.showDate ) {
					html +=
						'<time class="jp-relatedposts-post-date" datetime="' +
						post.date +
						'">' +
						post.date +
						'</time>';
				}
				if ( options.showContext ) {
					html += '<span class="jp-relatedposts-post-context">' + post.context + '</span>';
				}
				html += '</p>';
			} );
			return (
				'<div class="jp-relatedposts-items jp-relatedposts-items-minimal jp-relatedposts-' +
				options.layout +
				' ">' +
				html +
				'</div>'
			);
		},

generateVisualHtml: function ( posts, options ) {
			var self = this;
			var html = '';

posts.forEach( function ( post, index ) {
				var anchor = self.getAnchor( post, 'jp-relatedposts-post-a' );
				var classes = 'jp-relatedposts-post jp-relatedposts-post' + index;

if ( post.classes.length > 0 ) {
					classes += ' ' + post.classes.join( ' ' );
				}

if ( ! post.img.src ) {
					classes += ' jp-relatedposts-post-nothumbs';
				} else {
					classes += ' jp-relatedposts-post-thumbs';
				}

var dummyContainer = document.createElement( 'p' );
				dummyContainer.innerHTML = post.excerpt;
				var excerpt = dummyContainer.textContent;

html +=
					'<div class="' +
					classes +
					'" data-post-id="' +
					post.id +
					'" data-post-format="' +
					post.format +
					'">';
				if ( post.img.src ) {
					html +=
						anchor[ 0 ] +
						'<img class="jp-relatedposts-post-img" loading="lazy" src="' +
						post.img.src +
						'" width="' +
						post.img.width +
						'" height="' +
						post.img.height +
						( post.img.srcset ? '" srcset="' + post.img.srcset : '' ) +
						( post.img.sizes ? '" sizes="' + post.img.sizes : '' ) +
						'" alt="' +
						post.img.alt_text +
						'" />' +
						anchor[ 1 ];
				} else {
					var anchor_overlay = self.getAnchor(
						post,
						'jp-relatedposts-post-a jp-relatedposts-post-aoverlay'
					);
					html += anchor_overlay[ 0 ] + anchor_overlay[ 1 ];
				}
				html +=
					'<' +
					related_posts_js_options.post_heading +
					' class="jp-relatedposts-post-title">' +
					anchor[ 0 ] +
					post.title +
					anchor[ 1 ] +
					'</' +
					related_posts_js_options.post_heading +
					'>';
				html += '<p class="jp-relatedposts-post-excerpt">' + excerpt + '</p>';
				if ( options.showDate ) {
					html +=
						'<time class="jp-relatedposts-post-date" datetime="' +
						post.date +
						'">' +
						post.date +
						'</time>';
				}
				if ( options.showContext ) {
					html += '<p class="jp-relatedposts-post-context">' + post.context + '</p>';
				}
				html += '</div>';
			} );
			return (
				'<div class="jp-relatedposts-items jp-relatedposts-items-visual jp-relatedposts-' +
				options.layout +
				' ">' +
				html +
				'</div>'
			);
		},

/**
		 * We want to set a max height on the excerpt however we want to set
		 * this according to the natual pacing of the page as we never want to
		 * cut off a line of text in the middle so we need to do some detective
		 * work.
		 */
		setVisualExcerptHeights: function () {
			var elements = document.querySelectorAll(
				'#jp-relatedposts .jp-relatedposts-post-nothumbs .jp-relatedposts-post-excerpt'
			);

if ( ! elements.length ) {
				return;
			}

var firstElementStyles = getComputedStyle( elements[ 0 ] );

var fontSize = parseInt( firstElementStyles.fontSize, 10 );
			var lineHeight = parseInt( firstElementStyles.lineHeight, 10 );

// Show 5 lines of text
			for ( var i = 0; i < elements.length; i++ ) {
				elements[ i ].style.maxHeight = ( 5 * lineHeight ) / fontSize + 'em';
			}
		},

getTrackedUrl: function ( anchor ) {
			var args = 'relatedposts_hit=1';
			args += '&relatedposts_origin=' + anchor.getAttribute( 'data-origin' );
			args += '&relatedposts_position=' + anchor.getAttribute( 'data-position' );

var pathname = anchor.pathname;
			if ( '/' !== pathname[ 0 ] ) {
				pathname = '/' + pathname;
			}

if ( '' === anchor.search ) {
				return pathname + '?' + args;
			} else {
				return pathname + anchor.search + '&' + args;
			}
		},

cleanupTrackedUrl: function () {
			if ( 'function' !== typeof history.replaceState ) {
				return;
			}

function afterPostsHaveLoaded() {
		jprp.setVisualExcerptHeights();
		var posts = document.querySelectorAll( '#jp-relatedposts a.jp-relatedposts-post-a' );

Array.prototype.forEach.call( posts, function ( post ) {
			document.addEventListener( 'click', function () {
				post.href = jprp.getTrackedUrl( post );
			} );
		} );
	}

/**
	 * Initialize Related Posts.
	 */
	function startRelatedPosts() {
		jprp.cleanupTrackedUrl();

var endpointURL = jprp.getEndpointURL();
		var relatedPosts = document.querySelector( '#jp-relatedposts' );

if ( ! endpointURL ) {
			return;
		}

if ( document.querySelectorAll( '#jp-relatedposts .jp-relatedposts-post' ).length ) {
			afterPostsHaveLoaded();
			return;
		}

var request = new XMLHttpRequest();
		request.open( 'GET', endpointURL, true );
		request.setRequestHeader( 'x-requested-with', 'XMLHttpRequest' );

request.onreadystatechange = function () {
			if ( this.readyState === XMLHttpRequest.DONE && this.status === 200 ) {
				try {
					var response = JSON.parse( request.responseText );

if ( 0 === response.items.length || 0 === relatedPosts.length ) {
						return;
					}

jprp.response = response;

var html,
						showThumbnails,
						options = {};

if ( 'undefined' !== typeof wp && wp.customize ) {
						showThumbnails = wp.customize.instance( 'jetpack_relatedposts[show_thumbnails]' ).get();
						options.showDate = wp.customize.instance( 'jetpack_relatedposts[show_date]' ).get();
						options.showContext = wp.customize
							.instance( 'jetpack_relatedposts[show_context]' )
							.get();
						options.layout = wp.customize.instance( 'jetpack_relatedposts[layout]' ).get();
					} else {
						showThumbnails = response.show_thumbnails;
						options.showDate = response.show_date;
						options.showContext = response.show_context;
						options.layout = response.layout;
					}

html = ! showThumbnails
						? jprp.generateMinimalHtml( response.items, options )
						: jprp.generateVisualHtml( response.items, options );

var div = document.createElement( 'div' );
					relatedPosts.appendChild( div );
					div.outerHTML = html;

if ( options.showDate ) {
						var dates = relatedPosts.querySelectorAll( '.jp-relatedposts-post-date' );

Array.prototype.forEach.call( dates, function ( date ) {
							date.style.display = 'block';
						} );
					}

relatedPosts.style.display = 'block';
					afterPostsHaveLoaded();
				} catch ( error ) {
					// Do nothing
				}
			}
		};

request.send();
	}

if ( document.readyState !== 'loading' ) {
		init();
	} else {
		document.addEventListener( 'DOMContentLoaded', init );
	}
} )();

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