Category: React.js

カレンダー機能の要件
– 大画面で表示用
– formのカレンダーはdate pickerを使用する

react-calendarというlibraryがあるので、これをまず試したい
https://github.com/wojtekmaj/react-calendar

Installation
Add React-Calendar to your project by executing npm install react-calendar or yarn add react-calendar.

# npmでインストール
の前に、

[vagrant@localhost calendar]$ npm -v
1.3.6
[vagrant@localhost calendar]$ node -v
v0.10.48

その前にnodeとnpmをアップグレードしたい
[vagrant@localhost calendar]$ ll /etc/yum.repos.d/ | grep node
-rw-r–r–. 1 root root 464 9月 19 14:20 2014 nodesource-el.repo
[vagrant@localhost calendar]$ cat /etc/yum.repos.d/nodesource-el.repo
[nodesource]
name=Node.js Packages for Enterprise Linux 6 – $basearch
baseurl=https://rpm.nodesource.com/pub/el/6/$basearch

removeして最新を入れたい
$ sudo yum -y remove nodejs
$ sudo rm /etc/yum.repos.d/nodesource-el.repo

$ sudo yum install https://rpm.nodesource.com/pub_11.x/el/7/x86_64/nodesource-release-el7-1.noarch.rpm
$ ls -1 /etc/yum.repos.d
$ sudo yum install nodejs -y

[vagrant@localhost calendar]$ node -v
v11.15.0
[vagrant@localhost calendar]$ npm -v
6.7.0

react-calendarインストール
npm install react-calendar

あれ、その前にもう一回React.jsとwebpackを学ばないといかんやん。
ぎゃーーーーーーー

function TodoHeader(props){
            const remaining = props.todos.filter(todo => {
                return !todo.isDone;
        });
            return (
                <h1>
                    My Todos
                    <span>({remaining.length}/{props.todos.length})</span>
                </h1>
            );
    }

<script type="text/babel">
        (() => {

        const todos = [];

        function TodoHeader(props) {
        const remaining = props.todos.filter(todo => {
          return !todo.isDone;
        });
            return (
                <h1>
                    <button onClick={props.purge}>Purge</button>
                    My Todos
                    <span>({remaining.length}/{props.todos.length})</span>
                </h1>
            );
    }

        function TodoItem(props){
            return (
                <li key={props.todo.id}>
                    <label>
                    <input type="checkbox"
                        checked={props.todo.isDone}
                        onChange={() => props.checkTodo(props.todo)}
                    />
                    <span className={props.todo.isDone ? 'done' : ''}>
                    {props.todo.title}
                    </span>
                    </label>
                    <span className="cmd" onClick={() => props.deleteTodo(props.todo)}>[x]</span>
                </li>
            );
    }

        function TodoList(props){
            const todos = props.todos.map(todo => {
                return(
                    <TodoItem
                        key={todo.id}
                        todo={todo}
                        checkTodo={props.checkTodo}
                        deleteTodo={props.deleteTodo}
                    />

                );
        });
            return (
                <ul>
                    {props.todos.length ? todos: <li>nothing to do</li>}
                </ul>
            );
    }
        function TodoForm(props){
            return (
                <form onSubmit={props.addTodo}>
                        <input type="text" value={props.item} onChange={props.updateItem}/>
                        <input type="submit" value="Add"/>
                </form>
            );
    }

        function getUniqueId(){
            return new Date().getTime().toString(36) + '-' + Math.random().toString(36);
    }


        class App extends React.Component {
            constructor(){
                super();
                this.state = {
                todos: todos,
                item: ''
            };
            this.checkTodo = this.checkTodo.bind(this);
            this.deleteTodo = this.deleteTodo.bind(this);
            this.updateItem = this.updateItem.bind(this);
            this.addTodo = this.addTodo.bind(this);
            this.purge = this.purge.bind(this);
        }

         purge() {
          if (!confirm('are you sure?')) {
            return;
          }

          const todos = this.state.todos.filter(todo => {
            return !todo.isDone;
          });
          this.setState({
            todos: todos
          });
        }

        addTodo(e){
            e.preventDefault();

            if(this.state.item.trim()===''){
            return;
        }

            const item = {
                id: getUniqueId(),
                title: this.state.item,
                isDone: false
        };

        const todos = this.state.todos.slice();
        todos.push(item);
        this.setState({
            todos: todos,
            item: ''
    });
    }

        deleteTodo(todo){
            if (!confirm('are you sure?')) {
                return;
        }

            const todos = this.state.todos.slice();
            const pos = this.state.todos.indexOf(todo);

            todos.splice(pos, 1);
            this.setState({
            todos: todos
        });
    }

        checkTodo(todo){
            const todos = this.state.todos.map(todo => {
            return {id: todo.id, title: todo.title, isDone: todo.isDone};
        });

        const pos = this.state.todos.map(todo=>{
            return todo.id;
    }).indexOf(todo.id);

    todos[pos].isDone = !todos[pos].isDone;
    this.setState({
        todos: todos
});
    }


            updateItem(e){
                this.setState({
                item: e.target.value
            })
        }

            componentDidUpdate(){
                localStorage.setItem('todos', JSON.stringify(this.state.todos));
        }

        componentDidMount(){
                this.setState({
                    todos: JSON.parse(localStorage.getItem('todos')) || []
            });
        }

            render(){
             return (
                <div className="container">
                    <TodoHeader
                        todos={this.state.todos}
                        purge={this.purge}
                    />
                    <TodoList
                    todos={this.state.todos}
                    checkTodo={this.checkTodo}
                    deleteTodo={this.deleteTodo}
                     />
                    <TodoForm
                        item={this.state.item}
                        updateItem={this.updateItem}
                        addTodo={this.addTodo}
                    />
                </div>
             );
        }

    }
        ReactDOM.render(
            <App/>,
            document.getElementById('root')
        );
    })();
    </script>

<script type="text/babel">
        (() => {

        const todos = [
            {id: 0, title: 'Task 0', isDone: false},
            {id: 1, title: 'Task 1', isDone: false},
            {id: 2, title: 'Task 2', isDone: true}
        ];

        function TodoItem(props){
            return (
                <li key={props.todo.id}>
                    <label>
                    <input type="checkbox"
                        checked={props.todo.isDone}
                        onChange={() => props.checkTodo(props.todo)}
                    />
                    <span className={props.todo.isDone ? 'done' : ''}>
                    {props.todo.title}
                    </span>
                    </label>
                </li>
            );
    }

        function TodoList(props){
            const todos = props.todos.map(todo => {
                return(
                    <TodoItem
                        key={todo.id}
                        todo={todo}
                        checkTodo={props.checkTodo}
                    />

                );
        });
            return (
                <ul>
                    {todos}
                </ul>
            );
    }


        class App extends React.Component {
            constructor(){
                super();
                this.state = {
                todos: todos
            };
            this.checkTodo = this.checkTodo.bind(this);
        }

        checkTodo(todo){
            const todos = this.state.todos.map(todo => {
            return {id: todo.id, title: todo.title, isDone: todo.isDone};
        });

        const pos = this.state.todos.map(todo=>{
            return todo.id;
    }).indexOf(todo.id);

    todos[pos].isDone = !todos[pos].isDone;
    this.setState({
        todos: todos
});
    }

            render(){
             return (
                <div>
                    <h1>My Todo</h1>
                    <TodoList
                    todos={this.state.todos}
                    checkTodo={this.checkTodo}
                     />
                </div>
             );
        }

    }
        ReactDOM.render(
            <App/>,
            document.getElementById('root')
        );
    })();
    </script>

<script type="text/babel">
        (() => {

        const todos = [
            {id: 0, title: 'Task 0', isDone: false},
            {id: 1, title: 'Task 1', isDone: false},
            {id: 2, title: 'Task 2', isDone: true}
        ];

        function TodoItem(props){
            return (
                <li key={props.todo.id}>
                    <label>
                    <input type="checkbox"
                        checked={props.todo.isDone}
                        onChange={() => props.checkTodo(props.todo)}
                    />
                    <span className={props.todo.isDone ? 'done' : ''}>
                    {props.todo.title}
                    </span>
                    </label>
                    <span className="cmd" onClick={() => props.deleteTodo(props.todo)}>[x]</span>
                </li>
            );
    }

        function TodoList(props){
            const todos = props.todos.map(todo => {
                return(
                    <TodoItem
                        key={todo.id}
                        todo={todo}
                        checkTodo={props.checkTodo}
                        deleteTodo={props.deleteTodo}
                    />

                );
        });
            return (
                <ul>
                    {todos}
                </ul>
            );
    }


        class App extends React.Component {
            constructor(){
                super();
                this.state = {
                todos: todos
            };
            this.checkTodo = this.checkTodo.bind(this);
            this.deleteTodo = this.deleteTodo.bind(this);
        }

        checkTodo(todo){
            const todos = this.state.todos.map(todo => {
            return {id: todo.id, title: todo.title, isDone: todo.isDone};
        });

        const pos = this.state.todos.map(todo=>{
            return todo.id;
    }).indexOf(todo.id);

    todos[pos].isDone = !todos[pos].isDone;
    this.setState({
        todos: todos
});
    }

            render(){
             return (
                <div className="container">
                    <h1>My Todo</h1>
                    <TodoList
                    todos={this.state.todos}
                    checkTodo={this.checkTodo}
                    deleteTodo={this.deleteTodo}
                     />
                </div>
             );
        }

    }
        ReactDOM.render(
            <App/>,
            document.getElementById('root')
        );
    })();
    </script>

function TodoList(props){
            const todos = props.todos.map(todo => {
                return(
                    <TodoItem
                        key={todo.id}
                        todo={todo}
                        checkTodo={props.checkTodo}
                        deleteTodo={props.deleteTodo}
                    />

                );
        });
            return (
                <ul>
                    {props.todos.length ? todos: <li>nothing to do</li>}
                </ul>
            );
    }


        class App extends React.Component {
            constructor(){
                super();
                this.state = {
                todos: todos
            };
            this.checkTodo = this.checkTodo.bind(this);
            this.deleteTodo = this.deleteTodo.bind(this);
        }

        deleteTodo(todo){
            if (!confirm('are you sure?')) {
                return;
        }

            const todos = this.state.todos.slice();
            const pos = this.state.todos.indexOf(todo);

            todos.splice(pos, 1);
            this.setState({
            todos: todos
        });
    }

function TodoItem(props){
            return (
                <li key={props.todo.id}>
                    <label>
                    <input type="checkbox"
                        checked={props.todo.isDone}
                        onChange={() => props.checkTodo(props.todo)}
                    />
                    <span className={props.todo.isDone ? 'done' : ''}>
                    {props.todo.title}
                    </span>
                    </label>
                    <span className="cmd" onClick={() => props.deleteTodo(props.todo)}>[x]</span>
                </li>
            );
    }

        function TodoList(props){
            const todos = props.todos.map(todo => {
                return(
                    <TodoItem
                        key={todo.id}
                        todo={todo}
                        checkTodo={props.checkTodo}
                        deleteTodo={props.deleteTodo}
                    />

                );
        });
            return (
                <ul>
                    {props.todos.length ? todos: <li>nothing to do</li>}
                </ul>
            );
    }
        function TodoForm(props){
            return (
                <form>
                        <input type="text" value={props.item} onChange={props.updateItem}/>
                        <input type="submit" value="Add"/>
                </form>
            );
    }


        class App extends React.Component {
            constructor(){
                super();
                this.state = {
                todos: todos,
                item: ''
            };
            this.checkTodo = this.checkTodo.bind(this);
            this.deleteTodo = this.deleteTodo.bind(this);
            this.updateItem = this.updateItem.bind(this);
        }

        deleteTodo(todo){
            if (!confirm('are you sure?')) {
                return;
        }

            const todos = this.state.todos.slice();
            const pos = this.state.todos.indexOf(todo);

            todos.splice(pos, 1);
            this.setState({
            todos: todos
        });
    }

        checkTodo(todo){
            const todos = this.state.todos.map(todo => {
            return {id: todo.id, title: todo.title, isDone: todo.isDone};
        });

        const pos = this.state.todos.map(todo=>{
            return todo.id;
    }).indexOf(todo.id);

    todos[pos].isDone = !todos[pos].isDone;
    this.setState({
        todos: todos
});
    }


            updateItem(e){
                this.setState({
                item: e.target.value
            })
        }

            render(){
             return (
                <div className="container">
                    <h1>My Todo</h1>
                    <TodoList
                    todos={this.state.todos}
                    checkTodo={this.checkTodo}
                    deleteTodo={this.deleteTodo}
                     />
                    <TodoForm
                        item={this.state.item}
                        updateItem={this.updateItem}
                    />
                </div>
             );
        }

    }

<script type="text/babel">
        (() => {

        const todos = [];

        function TodoItem(props){
            return (
                <li key={props.todo.id}>
                    <label>
                    <input type="checkbox"
                        checked={props.todo.isDone}
                        onChange={() => props.checkTodo(props.todo)}
                    />
                    <span className={props.todo.isDone ? 'done' : ''}>
                    {props.todo.title}
                    </span>
                    </label>
                    <span className="cmd" onClick={() => props.deleteTodo(props.todo)}>[x]</span>
                </li>
            );
    }

        function TodoList(props){
            const todos = props.todos.map(todo => {
                return(
                    <TodoItem
                        key={todo.id}
                        todo={todo}
                        checkTodo={props.checkTodo}
                        deleteTodo={props.deleteTodo}
                    />

                );
        });
            return (
                <ul>
                    {props.todos.length ? todos: <li>nothing to do</li>}
                </ul>
            );
    }
        function TodoForm(props){
            return (
                <form onSubmit={props.addTodo}>
                        <input type="text" value={props.item} onChange={props.updateItem}/>
                        <input type="submit" value="Add"/>
                </form>
            );
    }

        function getUniqueId(){
            return new Date().getTime().toString(36) + '-' + Math.random().toString(36);
    }


        class App extends React.Component {
            constructor(){
                super();
                this.state = {
                todos: todos,
                item: ''
            };
            this.checkTodo = this.checkTodo.bind(this);
            this.deleteTodo = this.deleteTodo.bind(this);
            this.updateItem = this.updateItem.bind(this);
            this.addTodo = this.addTodo.bind(this);
        }

        addTodo(e){
            e.preventDefault();

            if(this.state.item.trim()===''){
            return;
        }

            const item = {
                id: getUniqueId(),
                title: this.state.item,
                isDone: false
        };

        const todos = this.state.todos.slice();
        todos.push(item);
        this.setState({
            todos: todos,
            item: ''
    });
    }

        deleteTodo(todo){
            if (!confirm('are you sure?')) {
                return;
        }

            const todos = this.state.todos.slice();
            const pos = this.state.todos.indexOf(todo);

            todos.splice(pos, 1);
            this.setState({
            todos: todos
        });
    }

        checkTodo(todo){
            const todos = this.state.todos.map(todo => {
            return {id: todo.id, title: todo.title, isDone: todo.isDone};
        });

        const pos = this.state.todos.map(todo=>{
            return todo.id;
    }).indexOf(todo.id);

    todos[pos].isDone = !todos[pos].isDone;
    this.setState({
        todos: todos
});
    }


            updateItem(e){
                this.setState({
                item: e.target.value
            })
        }

            render(){
             return (
                <div className="container">
                    <h1>My Todo</h1>
                    <TodoList
                    todos={this.state.todos}
                    checkTodo={this.checkTodo}
                    deleteTodo={this.deleteTodo}
                     />
                    <TodoForm
                        item={this.state.item}
                        updateItem={this.updateItem}
                        addTodo={this.addTodo}
                    />
                </div>
             );
        }

    }
        ReactDOM.render(
            <App/>,
            document.getElementById('root')
        );
    })();
    </script>

各パーツをそれぞれコンポートネントとして切り分ける。

<script type="text/babel">
        (() => {

        const todos = [
            {id: 0, title: 'Task 0', isDone: false},
            {id: 1, title: 'Task 1', isDone: false},
            {id: 2, title: 'Task 2', isDone: true}
        ];

        function TodoList(props){
            const todos = props.todos.map(todo => {
                return(
                    <li key={todo.id}>{todo.title}</li>
                );
        });
            return (
                <ul>
                    {todos}
                </ul>
            );
    }


        class App extends React.Component {
            constructor(){
                super();
                this.state = {
                todos: todos
            };
        }

            render(){
             return (
                <div>
                    <h1>My Todo</h1>
                    <TodoList todos={this.state.todos} />
                </div>
             );
        }

    }
        ReactDOM.render(
            <App/>,
            document.getElementById('root')
        );
    })();
    </script>

constで定義したstateを渡してますね。

<script type="text/babel">
        (() => {

        const todos = [
            {id: 0, title: 'Task 0', isDone: false},
            {id: 1, title: 'Task 1', isDone: false},
            {id: 2, title: 'Task 2', isDone: true}
        ];

        function TodoItem(props){
            return (
                <li key={props.todo.id}>
                    {props.todo.title}
                </li>
            );
    }

        function TodoList(props){
            const todos = props.todos.map(todo => {
                return(
                    <TodoItem
                        key={todo.id}
                        todo={todo}
                    />

                );
        });
            return (
                <ul>
                    {todos}
                </ul>
            );
    }


        class App extends React.Component {
            constructor(){
                super();
                this.state = {
                todos: todos
            };
        }

            render(){
             return (
                <div>
                    <h1>My Todo</h1>
                    <TodoList todos={this.state.todos} />
                </div>
             );
        }

    }
        ReactDOM.render(
            <App/>,
            document.getElementById('root')
        );
    })();
    </script>

function TodoItem(props){
            return (
                <li key={props.todo.id}>
                    <label>
                    <input type="checkbox"
                        checked={props.todo.isDone}
                    />
                    {props.todo.title}
                    </label>
                </li>
            );
    }

<script type="text/babel">
        (() =>{

            function Counter(props){

            function countUp(){
                alert('count up!');
            }
            return(
                <li style={{backgroundColor:props.color}} onClick={countUp}>
                0
                </li>
            );
        }

            ReactDOM.render(
                <div className="container">
                    <ul>
                        <Counter color="red"/>
                        <Counter color="yellow"/>
                        <Counter color="blue"/>
                    </ul>
                </div>,
                document.getElementById('root')
            );
    })();
    </script>

function Counter(props){

            function countUp(color){
                alert(color);
            }
            return(
                <li style={{backgroundColor:props.color}} onClick={() =>
                    countUp(props.color)}>
                0
                </li>
            );
        }

<script type="text/babel">
        (() =>{


            class Counter extends React.Component {
                render(){
                    return(
                        <li style={{backgroundColor:this.props.color}}>
                            0
                        </li>
                    );
            }
        }

            ReactDOM.render(
                <div className="container">
                    <ul>
                        <Counter color="red"/>
                        <Counter color="yellow"/>
                        <Counter color="blue"/>
                    </ul>
                </div>,
                document.getElementById('root')
            );
    })();
    </script>

<script type="text/babel">
        (() =>{


            class Counter extends React.Component {
                constructor(props){
                super(props);
                this.state = {
                    count: 10
            };
            }

                render(){
                    return(
                        <li style={{backgroundColor:this.props.color}}>
                            {this.state.count}
                        </li>
                    );
            }
        }

            ReactDOM.render(
                <div className="container">
                    <ul>
                        <Counter color="red"/>
                        <Counter color="yellow"/>
                        <Counter color="blue"/>
                    </ul>
                </div>,
                document.getElementById('root')
            );
    })();
    </script>

class Counter extends React.Component {
                constructor(props){
                super(props);
                this.state = {
                    count: 10,
                    message: 'hello!'
            };
            }

<script type="text/babel">
        (() =>{


            class Counter extends React.Component {
                constructor(props){
                super(props);
                this.state = {
                    count: 0
                };
                this.countUp = this.countUp.bind(this);
            }
                countUp(){
                    this.setState(prevState =>{
                        return {
                        count: prevState.count + 1
                    };
                });
            }

                render(){
                    return(
                        <li style={{backgroundColor:this.props.color}} onClick={this.countUp}>
                            {this.state.count}
                        </li>
                    );
            }
        }

            ReactDOM.render(
                <div className="container">
                    <ul>
                        <Counter color="red"/>
                        <Counter color="yellow"/>
                        <Counter color="blue"/>
                    </ul>
                </div>,
                document.getElementById('root')
            );
    })();
    </script>

<script type="text/babel">
        (() =>{


            function Counter(props){
            return(
                        <li style={{backgroundColor:props.counter.color}}>
                            {props.counter.id}:{props.counter.count}
                        </li>
                );

            }

            class App extends React.Component {
                constructor(){
                    super();
                    this.state = {
                    counters: [
                        {id: 'A', count: 0, color: 'red'},
                        {id: 'B', count: 0, color: 'yellow'},
                        {id: 'C', count: 0, color: 'blue'}
                    ]

                };
            }
                render(){
                return (
                    <div className="container">
                        <ul>
                            <Counter counter={this.state.counters&#91;0&#93;}/>
                            <Counter counter={this.state.counters&#91;1&#93;}/>
                            <Counter counter={this.state.counters&#91;2&#93;}/>
                        </ul>
                        <div>Total Inventory: 3</div>
                    </div>
                )
            }
        }

            ReactDOM.render(
                <App/>,
                document.getElementById('root')
            );
    })();
    </script>

<script type="text/babel">
        (() =>{


            function Counter(props){
            return(
                        <li style={{backgroundColor:props.counter.color}}>
                            {props.counter.id}:{props.counter.count}
                        </li>
                );

            }

            function CounterList(props){
                const counters = props.counters.map(counter => {
                    return(
                        <Counter counter={counter}/>
                    );
            });
                return (
                    <ul>
                        {counters}
                    </ul>
                );
        }

            class App extends React.Component {
                constructor(){
                    super();
                    this.state = {
                    counters: [
                        {id: 'A', count: 0, color: 'red'},
                        {id: 'B', count: 0, color: 'yellow'},
                        {id: 'C', count: 0, color: 'blue'}
                    ]

                };
            }
                render(){
                return (
                    <div className="container">
                         <CounterList counters={this.state.counters}/>
                        <div>Total Inventory: 3</div>
                    </div>
                )
            }
        }

            ReactDOM.render(
                <App/>,
                document.getElementById('root')
            );
    })();
    </script>

function CounterList(props){
                const counters = props.counters.map(counter => {
                    return(
                        <Counter
                        counter={counter}
                        key={counter.id}/>
                    );
            });

<script type="text/babel">
        (() =>{


            function Counter(props){
            return(
                        <li style={{backgroundColor:props.counter.color}} onClick={() => props.countUp(props.counter)}>
                            {props.counter.id}:{props.counter.count}
                        </li>
                );

            }

            function CounterList(props){
                const counters = props.counters.map(counter => {
                    return(
                        <Counter
                        counter={counter}
                        key={counter.id}
                        countUp={props.countUp}
                        />
                    );
            });
                return (
                    <ul>
                        {counters}
                    </ul>
                );
        }

            class App extends React.Component {
                constructor(){
                    super();
                    this.state = {
                    counters: [
                        {id: 'A', count: 0, color: 'red'},
                        {id: 'B', count: 0, color: 'yellow'},
                        {id: 'C', count: 0, color: 'blue'}
                    ]

                };
                this.countUp = this.countUp.bind(this);
            }

            countUp(counter){
                this.setState(prevState =>{
                    const counters = prevState.counters.map(counter => {
                    return {id: counter.id, count: counter.count, color: counter.color};
                });
                const pos = counters.map(counter => {
                    return counter.id;
            }). indexOf(counter.id);
                counters[pos].count++;
                return {
                counters: counters
            };
            });
        }
                render(){
                return (
                    <div className="container">
                         <CounterList
                         counters={this.state.counters}
                            countUp={this.countUp}
                         />
                        <div>Total Inventory: 3</div>
                    </div>
                )
            }
        }

            ReactDOM.render(
                <App/>,
                document.getElementById('root')
            );
    })();
    </script>

<script type="text/babel">
        (() =>{


            function Counter(props){
            return(
                        <li style={{backgroundColor:props.counter.color}} onClick={() => props.countUp(props.counter)}>
                            {props.counter.id}:{props.counter.count}
                        </li>
                );

            }

            function CounterList(props){
                const counters = props.counters.map(counter => {
                    return(
                        <Counter
                        counter={counter}
                        key={counter.id}
                        countUp={props.countUp}
                        />
                    );
            });
                return (
                    <ul>
                        {counters}
                    </ul>
                );
        }

            class App extends React.Component {
                constructor(){
                    super();
                    this.state = {
                    counters: [
                        {id: 'A', count: 0, color: 'red'},
                        {id: 'B', count: 0, color: 'yellow'},
                        {id: 'C', count: 0, color: 'blue'}
                    ],
                    total: 0

                };
                this.countUp = this.countUp.bind(this);
            }

            countUp(counter){
                this.setState(prevState =>{
                    const counters = prevState.counters.map(counter => {
                    return {id: counter.id, count: counter.count, color: counter.color};
                });
                const pos = counters.map(counter => {
                    return counter.id;
            }). indexOf(counter.id);
                counters[pos].count++;
                return {
                counters: counters,
                total: prevState.total + 1
            };
            });
        }
                render(){
                return (
                    <div className="container">
                         <CounterList
                         counters={this.state.counters}
                            countUp={this.countUp}
                         />
                        <div>Total Inventory: {this.state.total}</div>
                    </div>
                )
            }
        }

            ReactDOM.render(
                <App/>,
                document.getElementById('root')
            );
    })();
    </script>

なるほど、component単位でJavaScriptで作っていくってわけね。少し理解した。

<script type="text/babel">
        (() =>{

            function Counter(){
            return <div>0</div>
        }

            ReactDOM.render(
                <div>
                    <Counter/>
                    <Counter/>
                    <Counter/>
                </div>,
                document.getElementById('root')
            );
    })();
    </script>

<script type="text/babel">
        (() =>{

            function Counter(props){
            return <div>0 {props.color}</div>
        }

            ReactDOM.render(
                <div>
                    <Counter color="red"/>
                    <Counter color="yellow"/>
                    <Counter color="blue"/>
                </div>,
                document.getElementById('root')
            );
    })();
    </script>

<script type="text/babel">
        (() =>{

            function Counter(props){
            return <div style={{backgroundColor:props.color}}>0</div>
        }

            ReactDOM.render(
                <div>
                    <Counter color="red"/>
                    <Counter color="yellow"/>
                    <Counter color="blue"/>
                </div>,
                document.getElementById('root')
            );
    })();
    </script>

<script type="text/babel">
        (() =>{

            function Counter(props){
            return <li style={{backgroundColor:props.color}}>0</li>
        }

            ReactDOM.render(
                <div className="container">
                    <ul>
                        <Counter color="red"/>
                        <Counter color="yellow"/>
                        <Counter color="blue"/>
                    </ul>
                </div>,
                document.getElementById('root')
            );
    })();
    </script>

[ccs]
body {
font-size:16px;
font-family: Verdana, sans-serif;
}

.container {
width: 330px;
margin: 20px auto;
}

.container ul {
list-style: none;
margin: 0;
padding: 0;
display: flex;
flex-wrap:wrap;
}

.container li {
width: 100px;
height: 100px;
line-height: 100px;
text-align: center;
cursor: pointer;
user-select: none;
border-radius: 5px;
margin: 0 5px 10px;
}
[/ccs]

camelcaseでclassを書くこともできる。

<script type="text/babel">
        (() =>{

            ReactDOM.render(
                <div className="box"></div>,
                document.getElementById('root')
            );
    })();
    </script>

inlineもok

<script type="text/babel">
        (() =>{

            ReactDOM.render(
                <div style={{width:150, height:100, backgroundColor:'blue'}}></div>,
                document.getElementById('root')
            );
    })();
    </script>

onClick

<script type="text/babel">
        (() =>{

            function showMessage(){
                alert('this is alert!');
        }

            ReactDOM.render(
                <div style={{width:150, height:100, backgroundColor:'blue'}} onClick={showMessage}></div>,
                document.getElementById('root')
            );
    })();
    </script>

うぉ、なんかすげー疲れた。。
あれ、今の所は、レンダリングやalertなど特段JSで処理できることばかりだから、React.jsを使う場面がいまいち想像つかないぞ。。

JSXで渡せるのは一つだけ。
XMLベースのため、hrなど閉じタグのないタグはエラーになる。

<div id="root"></div> <!-- 部品を表示 -->
    <script type="text/babel">
        (() =>{
            const name = "yamada";
            ReactDOM.render(
                <p>React, {name.toUpperCase()}</p>, document.getElementById('root')
            );
    })();
    </script>

React, YAMADA

複数の要素を渡す場合は、親要素で囲う

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>React</title>
    <script src="https://unpkg.com/react@16/umd/react.production.min.js"></script>
    <script src="https://unpkg.com/react-dom@16/umd/react-dom.production.min.js"></script>
    <script src="https://unpkg.com/@babel/standalone/babel.min.js"></script>
    <link rel="stylesheet" href="css/styles.css">
</head>
<body>
    <div id="root"></div> <!-- 部品を表示 -->
    <script type="text/babel">
        (() =>{
            const name = "Yamada";
            ReactDOM.render(
                <div>
                    <p>React, {name.toUpperCase()}</p>
                    <p>{name.toLowerCase()}</p>
                </div>,
                document.getElementById('root')
            );
    })();
    </script>
</body>
</html>

React, YAMADA
yamada

– ユーザインタラクティブな画面をシンプルに構築
https://ja.reactjs.org/

– ES6:JavaScriptの新しい規格

– react developer toolsをchromeに入れる

あれ、atomと同じマークだ。atomってelectron&github開発だよね、確か。

– CDNはtutorialから取得
https://raw.githubusercontent.com/reactjs/reactjs.org/master/static/html/single-file-example.html

    <script src="https://unpkg.com/react@16/umd/react.development.js"></script>
    <script src="https://unpkg.com/react-dom@16/umd/react-dom.development.js"></script>
    <script src="https://unpkg.com/@babel/standalone/babel.min.js"></script>

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>React</title>
    <script src="https://unpkg.com/react@16/umd/react.production.min.js"></script>
    <script src="https://unpkg.com/react-dom@16/umd/react-dom.production.min.js"></script>
    <script src="https://unpkg.com/@babel/standalone/babel.min.js"></script>
    <link rel="stylesheet" href="css/styles.css">
</head>
<body>
    <div id="root"></div> <!-- 部品を表示 -->
    <script type="text/babel">
        (() =>{
            ReactDOM.render(
                <p>React</p>, document.getElementById('root')
            );
    })();
    </script>
</body>
</html>

React.jsはUIのパーツを作るためのライブラリ
FacebookがOSSとして公開 https://github.com/facebook/react

idに○○を指定して、部品を動かす、などの際に使用する。

<html>
    <body>
        <div id="hogehoge"></div>
    </body>
</html>

Elemental UI

– ボタン、テキストが大量にあり、入力内容を即座に表示するような部品に活きる
　- 電卓、カレンダーなど
– jQueryのように、アニメーションが得意ではない
– Facebook, Instagram, Yahoo, Atomなどが導入
– Backbone.jsやAngular.jsとも併用可能
– 通常はJSXを使うが、自動コンパイルされる
– npm react-toolsによるJSXビルドの方法もある

React.jsのファイルを読み込む

<script src="http://fb.me/react-0.13.3.js"></script>
<script src="http://fb.me/JSXTransformer-0.13.3.js"></script>

sample

<html>
    <head>
        <script src="http://fb.me/react-0.13.3.js"></script>
        <script src="http://fb.me/JSXTransformer-0.13.3.js"></script>
    </head>
    <body>
        <div id="app"></div>

        <script type="text/jsx">
            var Test = React.createClass({
            render: function(){
            return (
                <p>This is React Test!</p>
            );
        }
        });

        var m = React.render(<Test />, document.getElementById('app'));
        </script>
    </body>
</html>

vue.js vs react.js

reactの基本は知っておく必要があるかもだが、vue.jsの方が強いな。