RealWorld/realworld/src/main/webapp/WEB-INF/jsp/user/userDetail.jsp

<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<%@ taglib uri="http://www.springframework.org/tags/form" prefix="form" %>
<%@ taglib uri="http://java.sun.com/jsp/jstl/fmt" prefix="fmt" %>
<%@ taglib uri="http://www.springframework.org/tags" prefix="spring" %>
<%@ taglib uri="http://java.sun.com/jsp/jstl/functions" prefix="fn" %>
<%@ page language="java" contentType="text/html;charset=UTF-8" pageEncoding="UTF-8" %>

<jsp:include page="/WEB-INF/jsp/include/head.jsp"></jsp:include>
<script>
    let targetFeed = null;
    let params = {};
    let query = null;
    let url = null;
    let loadingArticles = null;
    let articleList = null;
    const tagSet = new Set();
    const options = { method: 'GET' };
    const follow = 'Follow ' + "${user.username}";
    const unfollow = 'Unfollow ' + "${user.username}";

    // 게시글 목록 로딩
    const setLoading = (type) => {
        let loadingDisplay = null;
        let contentDisplay = null;

        if(type === 'on') {
            loadingDisplay = 'block';
            contentDisplay = 'none';
        } else if(type === 'off') {
            loadingDisplay = 'none';
            contentDisplay = 'block';
        }
        
        loadingArticles.style.display = loadingDisplay;
        articleList.style.display = contentDisplay;
    }

    // 게시글이 없는 경우
    const noContent = () => {
        if(articleList.firstChild === null) {
            const p = document.createElement('p');

            p.classList.add('article-preview');
            p.textContent = 'No articles are here... yet.';
            articleList.appendChild(p);
        }
    }

    const focusFeed = () => {
        // 이미 포커싱되었으면 중단
        if(event.target.parentNode.classList.contains('active')) {
            return ;
        }

        const currentFeed = event.target.parentNode; // 포커싱할 피드
        const focusedFeed = (currentFeed.id === 'favorite-feed') ? document.querySelector('#your-feed') : document.querySelector('#favorite-feed'); // 현재 포커싱되어있는 피드
        
        currentFeed.classList.add('active');
        focusedFeed.classList.remove('active');

        // targetFeed 초기화
        targetFeed = currentFeed;
        setLoading('on');
        console.log(targetFeed)
        console.log(articleList.firstChild)
        // 게시글 초기화
        while(articleList.firstChild) {
            articleList.firstChild.remove();
        }

        params = {
            articleId: -1,
            feed: targetFeed.id
        };
        query = Object.keys(params)
                .map(key => encodeURIComponent(key) + '=' + encodeURIComponent(params[key]))
                .join('&');
        url = '/article/page/users/${user.id}?' + query;

        fetch(url, options)
            .then(response => response.json())
            .then(json => {
                const { articles, paging } = json;
                username = "${ssUsername}";

                displayArticles(articles);
                nextPageLoad(articles, paging);
                console.log(articleList.firstChild)

                setTimeout(() => {
                    setLoading('off');
                    noContent();
                }, 1000)
            })

    }

    // 좋아요 버튼
    const favoriteBtn = (indexNumber) => {
        const favoriteNum = event.target.querySelector('.count').textContent;
        const favorite = event.target.querySelector('.favorite-btn');
        let counts = parseInt(favoriteNum);
        let newCounts = counts + 1;

        // 로그인한 경우에만 실행
        if("${ssIsLogin}" === "true") {
            if(event.target.classList.contains('active')) { // 좋아요 버튼 해지
                event.target.querySelector('.count').textContent = counts - 1;
                event.target.classList.remove('active');

                fetch('/article/' + indexNumber + '/favorite', { method: 'DELETE' })
                    .then(response => {
                        if(response.status === 200) {
                            return ;
                        }
                    });
            } else { // 좋아요 버튼 활성
                event.target.querySelector('.count').textContent = newCounts;
                event.target.classList.add('active');

                fetch('/article/' + indexNumber + '/favorite', {
                    body: JSON.stringify({
                        articleId: "${article.id}",
                        userId: "${ssId}",
                        created: new Date()
                    }),
                    method: 'POST',
                    headers: {
                        "Content-Type": "application/json"
                    }
                })
                    .then(response => {
                        if(response.status === 201) {
                            return;
                        }
                    })
            }
        } else {
            location.href = "/user/signin";
        }
    }

    // 사용자 팔로우
    const userFollow = () => {
        const followBtn = document.querySelector('.follow-btn');
        const req = {
            fromUser: "${ssId}",
            toUser: "${user.id}"
        };

        if("${ssIsLogin}" === "true") { // 로그인한 경우에만 팔로우 기능 사용 가능
            if(followBtn.classList.contains('active')) { // 팔로우 취소
                followBtn.querySelector('.follow').textContent = follow;
                fetch("/user/unfollow", {
                    body: JSON.stringify(req),
                    method: 'DELETE',
                    headers: {
                        "Content-Type": "application/json"
                    }
                })
                    .then(response => {
                        if(response.status === 200) {
                            return followBtn.classList.remove('active');
                        }
                    })
            } else { // 팔로우하기
                followBtn.querySelector('.follow').textContent = unfollow;
                fetch("/user/follow", {
                    body: JSON.stringify(req),
                    method: 'POST',
                    headers: {
                        "Content-Type": 'application/json'
                    }
                })
                    .then(response => {
                        if(response.status === 201) {
                            return followBtn.classList.add('active');
                        }
                    })
            }
        } else { // 로그인하지 않은 경우 로그인화면으로 이동
            location.href = "/user/signin"
        }
    }

    // 게시글 목록 조회
    const displayArticles = (articles) => {
        articles.forEach(article =>  {
            console.log(JSON.stringify(article))
            const domParser = new DOMParser();

            // 게시글 정보
            const domStrArticleMeta =
                `
                <div class="article-meta">
                    <div class="metadata">
                        <a href="/user/\${article.writerId}">
                            <img src="/resources/images/avatar.png" alt="avatar">
                        </a>
                        <div class="article-info">
                            <a href="/user/\${article.writerId}" class="name">\${article.writerName}</a>
                            <span class="date"></span>
                        </div>
                    </div>
                    <div>
                        <button class="favorite-btn" onclick="favoriteBtn(\${article.id})">
                            <i class="fas fa-heart"></i>
                            <span class="count">\${article.favoriteNum}</span>
                        </button>
                    </div>
                </div>
                `;
            const divArticleMeta = domParser.parseFromString(domStrArticleMeta, 'text/html').body.firstChild;
            divArticleMeta.querySelector('.date').textContent = new Date(article.created).toLocaleString();

            // 게시글 좋아요한 경우 active
            if (article.favorite) {
                divArticleMeta.querySelector('.favorite-btn').classList.add('active');
            }

            // 게시글 내용 및 게시글태그
            const domStrPreviewLink =
                `
                <a href="/article/\${article.id}" class="preview-link">
                    <h1 class="preview-title">\${article.title}</h1>
                    <p>\${article.subtitle}</p>
                    <div class="tag-data">
                        <span>Read more...</span>
                        <ul class="tag-list">
                        </ul>
                    </div>
                </a>
                `;
            const aPreviewLink = domParser.parseFromString(domStrPreviewLink, 'text/html').body.firstChild;
            const ul = aPreviewLink.querySelector('.tag-list');

            if (article.tags !== '') {
                article.tags.split(',').forEach(tag => {
                    if(!tagSet.has(tag)) {
                        tagSet.add(tag);
                    }

                    const li = document.createElement('li');
                    li.classList.add('tag');
                    li.textContent = tag;
                    ul.appendChild(li);
                });
            }

            // 게시글 완성
            const articlePreview = document.createElement('article');
            articlePreview.classList.add('article-preview');
            articlePreview.append(divArticleMeta, aPreviewLink);
            articleList.appendChild(articlePreview);
        })
    }

    const nextPageLoad = (articles, paging) => {
        // 더 조회될 수 있는 게시글이 있는지 여부
        if(paging.isNext) {
            const moreButton = document.createElement('button');
            const loading = document.createElement('div');

            moreButton.textContent = '더보기';
            moreButton.classList.add('more-button');
            loading.setAttribute('id', 'loading');
            articleList.appendChild(moreButton);

            // more 버튼 클릭 시 다음페이지 게시물을 가져온다
            moreButton.onclick = () => {
                articleList.removeChild(moreButton);
                articleList.appendChild(loading); // 로딩 생성

                // 현재 페이지의 마지막 게시글 id
                params.articleId = articles[articles.length - 1].id;
                query = Object.keys(params)
                        .map(key => encodeURIComponent(key) + '=' + encodeURIComponent(params[key]))
                        .join('&');
                url = '/article/page/users/${user.id}?' + query;

                fetch(url, options)
                    .then(response => response.json())
                    .then(json => {
                        const {
                            articles,
                            paging
                        } = json;
                        username = "${ssUsername}";
                        setTimeout(() => {
                            articleList.removeChild(loading);
                            displayArticles(articles);
                            nextPageLoad(articles, paging);
                        }, 1000);
                    })
            }
        }
    }
    
    window.onload = () => {
        targetFeed = document.querySelector('.nav-item.active');
        loadingArticles = window.document.querySelector('#article-loading');
        articleList = document.querySelector('#article-list');
        params = {
            articleId: -1,
            feed: 'your-feed'
        };
        query = Object.keys(params)
                    .map(key => encodeURIComponent(key) + '=' + encodeURIComponent(params[key]))
                    .join('&');
        url = '/article/page/users/${user.id}?' + query;

        // 팔로우 하고 있는 경우
        const followString = document.querySelector('.follow-btn');
        if("${isFollow}" === "true"){
            followString.classList.add('active');
            followString.querySelector('.follow').textContent = unfollow;
        }
        
        setLoading('on');
        // fetch api call
        fetch(url, options)
            .then(response => response.json())
            .then(json => {
                const { articles, paging } = json;
                username = "${ssUsername}";

                displayArticles(articles);
                nextPageLoad(articles, paging);

                // hide loadings
                setTimeout(() => {
                    setLoading('off');
                    noContent();
                }, 1000);
            });
    }

</script>
</head>

<body>
    <jsp:include page="/WEB-INF/jsp/include/header.jsp"></jsp:include>

    <!-- user-page content -->
    <div class="user-page">
        <!-- User Info -->
        <section class="user-info">
            <div class="container">
                <div class="row">
                    <div class="col-10">
                        <img src="/resources/images/avatar.png" alt="" class="user-img">
                        <h4 class="user-name"><c:out value="${user.username}"></c:out></h4>
                        <p class="profile-bio">
                            <pre>
                                <c:out value="${user.shortBio}"></c:out>
                            </pre>
                        </p>
                        <c:choose>
                            <c:when test="${user.id eq ssId}">
                                <a href="/user/settings/${user.id}" class="action-btn btn-sm">
                                    <i class="fas fa-cog"></i>&nbsp;Edit Profile Settings
                                </a>
                            </c:when>
                            <c:otherwise>
                                <button class="action-btn btn-sm follow-btn" onclick="userFollow()">
                                    <i class="fas fa-plus"></i>
                                    <span class="follow">&nbsp;Follow <c:out value="${user.username}"/></span>
                                </button>
                            </c:otherwise>
                        </c:choose>
                    </div>
                </div>
            </div>
        </section>
        <!-- Body -->
        <div class="container main">
            <div class="row">
                <div class="col-10">
                    <!-- 토글 버튼으로 피드 내용 보기 -->
                    <div class="toggle">
                        <ul class="nav">
                            <li id="your-feed" class="nav-item active">
                                <a href="javascript:void(0);" onclick="focusFeed()">My Articles</a>
                            </li>
                            <li id="favorite-feed" class="nav-item">
                                <a href="javascript:void(0);" onclick="focusFeed()">Favorited Articles</a>
                            </li>
                        </ul>
                    </div>

                    <!-- Content -->
                    <div class="article">
                        <!-- Article Loading -->
                        <article id="article-loading">
                            Loading articles...
                        </article>

                        <!-- Article List -->
                        <div id="article-list" style="display: block;"></div>
                    </div>
                </div>
            </div>
        </div>
    </div>
</body>

</html>