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@nakadoribooks(中通 書店)

vueとfirebaseでブラウザチャット

Last updated at Posted at 2017-08-05

ブラウザのチャットを作ります。

成果物

デモ
https://anywaychat.netlify.com

コンセプト

夏休みのプログラミング教室を想定して

  • コマンド打たない
  • 開発環境の構築をしない
  • 多少「こんなん作れんだ！」感があるもの

使うもの

実装

index.html
<html lang="ja">
<head>
    <meta charset="utf8" />
    <!-- cssライブラリの読み込み -->
    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css">
    <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/bulma/0.5.0/css/bulma.min.css">
    <!-- 自分で書いたcssの読み込み -->
    <link rel="stylesheet" href="style.css">
</head>
<body>
<div id='app'>

    <!-- ▼画面上部の緑の部分 -->
    <header>
        <h1 class="title is-5">AnywayChat</h1>
        <p class="chaturl subtitle"><a v-bind:href="developerSite" target="_blank">created by {{developerName}}</a></p>
    </header>
    <!-- ▲画面上部の緑の部分 -->

    <div id="message-contents">
        <!-- ▼メッセージ一個ぶんの表示 -->
        <div v-for="message in messageList" class="message-wrapper is-clearfix">
            <div class="box" v-bind:class="{'mymessage' : isMyMessage(message) }">
                <div class="content">
                    <p>
                    <strong>{{message.userName}}</strong> <small>{{displayTime(message)}}</small>
                    <br />
                    {{message.message}}
                    </p>
                </div>
            </div>
        </div>
        <!-- ▲メッセージ一個ぶんの表示 -->
    </div>
    
    <!-- ▼メッセージ入力部分 -->
    <footer>
        <div class="field is-grouped">
            <div class="control is-expanded">
                <input v-model="message" v-on:keydown.enter="send" class="input is-medium" type="text" placeholder="Message" />
            </div>
            <div class="control control-submit">
                <button v-bind:disabled="message.length==0" v-on:click="send" class="button is-primary button-submit">送信</button>
            </div>
        </div>
    </footer>
    <!-- ▲メッセージ入力部分 -->
</div>

<!-- javascriptライブラリの読み込み -->
<script src="https://unpkg.com/vue"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/babel-standalone/6.24.0/babel.js"></script> 
<script src="https://cdnjs.cloudflare.com/ajax/libs/animejs/2.0.2/anime.js"></script>
<script src="https://www.gstatic.com/firebasejs/4.2.0/firebase.js"></script>
<script src="https://www.gstatic.com/firebasejs/3.8.0/firebase-app.js"></script>
<script src="https://www.gstatic.com/firebasejs/3.8.0/firebase-database.js"></script>

<!-- 自分で書いたjavascriptの読み込み -->
<script type='text/babel' src="script.js"></script>
</body>
</html>
script.js
let app = new Vue({
  el: '#app',

  // 初期化
  created: function () {

    // ユーザ名の設定
    let inputedUserName = window.prompt("ユーザ名を入力してください", "");
    this.userName = inputedUserName
    
    if(inputedUserName.length == 0){
        // 入力がなかった場合
        let dummyNameList = ['太宰治','三島由紀夫','カフカ','田中角栄', '大塩平八郎', '土方巽', 'アルベルト・アインシュタイン', 'バラモス', 'メタルスライム'];
        this.userName =  dummyNameList[Math.floor(Math.random() * dummyNameList.length)];
    }

    // firebaseの設定
    this.setupFirebase()

    // chatの設定
    this.setupChat()

    // メッセージを読み込む
    this.loadMessage()
  },

  // これ大事
  data: {
    message: ""
    , userName: ""
    , userId: Math.random().toString(36).slice(-8)
    , messageList: []
    , developerName: "nakadoriBooks"
    , developerSite: "https://twitter.com/nakadoribooks"
  },

  // 処理
  methods: {

    // firebaeの設定
    setupFirebase: function(){
        var config = {
            apiKey: "AIzaSyBWasVTMVGAc1c8IlrXIdKYuIN5i8yMk-I",
            authDomain: "nakadorichat.firebaseapp.com",
            databaseURL: "https://nakadorichat.firebaseio.com",
            projectId: "nakadorichat",
            storageBucket: "",
            messagingSenderId: "46816258733"
        };
        firebase.initializeApp(config);
    },

    // チャット読み込み
    setupChat: function(){
        let ref = firebase.database().ref('chats')
        let hash = location.hash

        // chatId があったとき
        if(hash != null && hash.length > 0){
            let chatId = hash.slice( 1 ) ;
            this.chatRef = ref.child(chatId)
            console.log("read chat", chatId)
        }
        // なかったとき
        else{
            let createdAt = this.timestamp()

            // 新しいチャットを作って
            this.chatRef = ref.push()

            // 保存する
            this.chatRef.set({
                createdAt: createdAt
                , createdAtReverse: -createdAt
            })

            location.href = location.origin + location.pathname + "#" + this.chatRef.key
            console.log("create chat", this.chatRef.key)
        }
    },

    // メッセージを送る
    send: function(event){
        if(this.message.length == 0){
            return;
        }

        // 新しいメッセージを作って
        let messageRef = firebase.database().ref('messages').push()
        let createdAt = this.timestamp()

        // 保存する
        let chat = this.chatRef.key
        messageRef.set({
            chat: chat
            , message:this.message
            , userName: this.userName
            , userId: this.userId
            , createdAt: createdAt
            , createdAtReverse: -createdAt
        })

        // 入力エリアリセット
        this.message = ""
    }

    // メッセージを読み込む
    , loadMessage:function(){
        let chatKey = this.chatRef.key
        let loadRef = firebase.database().ref("messages").orderByChild("chat").equalTo(chatKey)

        // 最初に全部取ってくる
        loadRef.once('value').then((snapshot) => {

            var messageList = []            
            snapshot.forEach(function(childSnapshot) {
                var data = childSnapshot.val()
                data.key = childSnapshot.key
                messageList.push(data)
            })

            // 日付でソート
            messageList.sort(function(a,b){
                if( a.createdAt < b.createdAt ) return -1;
                if( a.createdAt > b.createdAt ) return 1;
                return 0;
            });

            // 表示に反映
            this.messageList = messageList

            // 追加の監視
            this.observeMessage()

            // 下までスクロール
            this.scrollToBottom()
        });
    },

    // メッセージの監視
    observeMessage: function(){
        let chatKey = this.chatRef.key
        let chatRef = firebase.database().ref("messages").orderByChild("chat").equalTo(chatKey)
        chatRef.on("child_added", (snapshot) => {
            let newMessage = snapshot.val()
            newMessage.key = snapshot.key
            for(var i=0,max=this.messageList.length;i<max;i++) {
                let message = this.messageList[i]
                if(message.key == newMessage.key){
                    return
                }
            }

            // 表示に反映
            this.messageList.push(newMessage)
            this.scrollToBottom()
        })
    },

    // 下までスクロール
    scrollToBottom :function() {
        setTimeout(()=>{
            let height = Math.max(0, document.body.scrollHeight - document.body.clientHeight)
            anime({
                targets: "body",
                scrollTop: height,
                duration: 200,
                easing: "easeInQuad"
            });
        }, 100)
    },

    // おれのメッセージ？
    isMyMessage: function(message){
        return this.userId == message.userId
    },

    displayTime: function(message) {
        let timestamp = message.createdAt * 1000
        var date = new Date(timestamp)
        var diff = new Date().getTime() - date.getTime()
        var d = new Date(diff);

        if (d.getUTCFullYear() - 1970) {
            return d.getUTCFullYear() - 1970 + '年前'
        } else if (d.getUTCMonth()) {
            return d.getUTCMonth() + 'ヶ月前'
        } else if (d.getUTCDate() - 1) {
            return d.getUTCDate() - 1 + '日前'
        } else if (d.getUTCHours()) {
            return d.getUTCHours() + '時間前'
        } else if (d.getUTCMinutes()) {
            return d.getUTCMinutes() + '分前'
        } else {
            return d.getUTCSeconds() + '秒前'
        }
    },
    timestamp: function(){
        let date = new Date()
        let timestamp = date.getTime()
        return Math.floor( timestamp / 1000 )
    }
  }
})

その他

style.css
/**
 primaryColor: #00d1b2
**/

header{
    position:fixed;
    width:100%;
    background:#00d1b2;
    z-index:2;
    height:55px;
}

#app header h1{
    padding-left:10px;
    padding-top:8px;
    color:#ffffff;
}

.chaturl{
    padding-left:10px;
}

.chaturl a{
    color:#ffffff;
    font-size:14px;
}

.chaturl a:hover{
    text-decoration: underline;
}

footer{
    position:fixed;
    bottom:0px;
    width:100%;
    height:66px;
    border-top:1px solid #aaaaaa;
    background:#ffffff;
}

footer .field{
    padding:10px;
}

.button-submit{
    height:45px;
    line-height:1.0;
    width:100%;
}

.control-submit{
    width:20%;
}

#message-contents{
    z-index:1;
    padding: 55px 10px 76px 10px;
    background:#ffffff;
}

.message-wrapper{
    margin:20px 10px;
}

.message-wrapper .box{
    float:left;
}
.message-wrapper .box.mymessage{
    float:right;
}

.mymessage p{
    text-align: right;
}

#時間割

1回2時間を 3回くらいかな

  • css/html/jsの雰囲気
  • vue の感じ
  • アプリケーション実装
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