React学习笔记—简易信息管理，实现CUD

2019年9月20日 144次阅读 来源: 小俞

需求

利用React实现一个简易的信息管理系统。
《React学习笔记—简易信息管理，实现CUD》

写的不太好，欢迎熟悉React的大神来找茬。真心感激！

分析

编写React就是不断构建组件的过程，首先要根据需求进行UI的划分：

-StudentBox
  -StudentList
    -Student
  -StudentForm

编码

服务端

没有用到服务器，采用了数据模拟的方式

var id = 41060122; //添加信息时自增长ID

var data = [
    {
        id: 41060120,
        name: 'Mary',
        age: 20
    },
    {
        id: 41060121,
        name: 'Jacky',
        age: 18
    },
    {
        id: 41060122,
        name: 'Helen',
        age: 21
    }
];

页面

<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title>React</title>
    <link rel="stylesheet" href="css/bootstrap.css"/>
    <link rel="stylesheet" href="css/style.css"/>
</head>
<body>
<script src="js/lib/react.js"></script>
<script src="js/lib/JSXTransformer.js"></script>
<script src="js/lib/underscore.js"></script>
<script src="js/table.js" type="text/jsx;harmony=true"></script>
</body>
</html>

组件

StudentBox

var StudentBox = React.createClass({
    getInitialState: function () {
        return {data: data};
    },
    //删除
    handleDelete: function (index) {
        this.state.data.splice(index, 1);
        this.forceUpdate();
    },
    //更新
    handleUpdate: function (student) {
        this.state.data.forEach(function (item) {
            if (item.id === student.id) {
                _.extend(item, student);
            }
        });
        this.forceUpdate();
    },
    //新增
    handleSave: function (student) {
        this.state.data.push(_.extend(student, {id: ++id}));
        this.forceUpdate();
    },
    render: function () {
        return (
            <div className="container">
                <div className="page-header">
                    <h1>Student Messages</h1>
                </div>
                <StudentList data={this.state.data} delete={this.handleDelete} update={this.handleUpdate}/>
                <StudentForm save={this.handleSave}/>
            </div>
        )
    }
});

StudentList

var StudentList = React.createClass({
    render: function () {
        var handleDelete = this.props.delete;
        var handleUpdate = this.props.update;
        return (
            <table className="table table-striped table-hover">
                <thead>
                <tr>
                    <th>index</th>
                    <th>number</th>
                    <th>name</th>
                    <th>age</th>
                    <th>operation</th>
                </tr>
                </thead>
                <tbody id="tbody">
                {this.props.data.map(function (student, index) {
                    return <Student index={index} data={student} delete={handleDelete} update={handleUpdate}/>
                })}
                </tbody>
            </table>
        )
    }
});

Student

var Student = React.createClass({
    getInitialState: function () {
        return {isEdit: false};
    },
    handleEdit: function () {
        this.setState({isEdit: !this.state.isEdit});
    },
    handleDelete: function (index) {
        this.props.delete(index);
    },
    handleUpdate: function (id) {
        var name = React.findDOMNode(this.refs.name).value.trim();
        var age = React.findDOMNode(this.refs.age).value.trim();

        if (!name || !age) {
            return;
        }

        this.props.update({
            id: id,
            name: name,
            age: age
        });
        this.handleEdit();
    },
    render: function () {
        var index = this.props.index;
        var student = this.props.data;

        var operations = this.state.isEdit ?
            <div>
                <button className="btn btn-primary btn-xs" onClick={this.handleUpdate.bind(this,student.id)}>save
                </button>
                <button className="btn btn-info btn-xs" onClick={this.handleEdit}>cancel
                </button>
            </div> :
            <div>
                <button className="btn btn-default btn-xs" onClick={this.handleEdit.bind(this,index)}>edit</button>
                <button className="btn btn-danger btn-xs" onClick={this.handleDelete.bind(this,index)}>delete
                </button>
            </div>;


        var name = this.state.isEdit ?
            <input type="text" className="form-control input-sm" defaultValue={student.name}
                   ref="name"/> : student.name;

        var age = this.state.isEdit ?
            <input type="text" className="form-control input-sm" defaultValue={student.age} ref="age"/> : student.age;

        return (
            <tr>
                <td>{index}</td>
                <td>{student.id}</td>
                <td>{name}</td>
                <td>{age}</td>
                <td>{operations}</td>
            </tr>
        )
    }
});

StudentForm

var StudentForm = React.createClass({
    handleSubmit: function (e) {
        e.preventDefault();

        var name = React.findDOMNode(this.refs.name).value.trim();
        var age = React.findDOMNode(this.refs.age).value.trim();

        if (!name || !age) {
            return;
        }

        this.props.save({
            name: name,
            age: age
        });
    },
    render: function () {
        return (
            <form onSubmit={this.handleSubmit}>
                <div className="row">
                    <div className="col-xs-5">
                        <input type="text" ref="name" className="form-control input-sm" placeholder="student name"/>
                    </div>
                    <div className="col-xs-5">
                        <input type="text" ref="age" className="form-control input-sm" placeholder="student age"/>
                    </div>
                    <div className="col-xs-2">
                        <button type="submit" className="btn btn-warning btn-sm">Add student</button>
                    </div>
                </div>
            </form>

        )
    }
});

渲染

React.render(
    <StudentBox />,
    document.body
);
    原文作者：小俞
    原文地址: https://segmentfault.com/a/1190000002677804
    本文转自网络文章，转载此文章仅为分享知识，如有侵权，请联系博主进行删除。
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