Các kiến thức trong Project này gồm có:
- Sử dụng Class: props, state, event
- Redux: Reducers, actions, container components
- Storage
- Protypes
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<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8" /> <meta http-equiv="X-UA-Compatible" content="IE=edge" /> <meta name="viewport" content="width=device-width, initial-scale=1.0" /> <title>ReactJS</title> <style> table { border-collapse: collapse; } th, td { padding: 0 0.5rem; border: 1px solid black; } </style> </head> <body> <div id="root"></div> <script crossorigin src="https://unpkg.com/react@17/umd/react.development.js"></script> <script crossorigin src="https://unpkg.com/react-dom@17/umd/react-dom.development.js"></script> <script src="https://unpkg.com/babel-standalone@6/babel.min.js"></script> <script src="https://cdnjs.cloudflare.com/ajax/libs/redux/4.1.0/redux.js"></script> <script src="https://cdnjs.cloudflare.com/ajax/libs/react-redux/7.2.4/react-redux.js"></script> <!-- =========== src/utils.js =========== --> <script> class Uuid { s4() { return Math.floor((1 + Math.random()) * 0x10000) .toString(16) .substring(1); } s16() { return this.s4() + this.s4() + this.s4() + this.s4(); } } let uuid = new Uuid(); </script> <!-- =========== constants/ActionTypes.js =========== --> <script> //Các hằng số types ==> sử dụng cho các actions const types = { SAVE_STUDENT: 'SAVE_STUDENT', DELETE_STUDENT: 'DELETE_STUDENT', }; </script> <!-- =========== reducers/listStudent_reducer.js =========== --> <script> //Trong 1 Reducer bao gồm 2 thành phần: state và reducer //State là nơi chứa dữ liệu //Reducer là nơi xử lý các action (khi bị dispatch) //---- listStudent_state có thể khởi tạo mặc định hoặc lấy trên localStorage let listStudent_state = JSON.parse(localStorage.getItem('listStudent')) || []; let listStudent_reducer = (state = listStudent_state, action) => { //Khi làm việc với state, cần return ra 1 state mới, //Tốt nhất nên copystate cũ luôn let new_state = [...state] switch (action.type) { case types.SAVE_STUDENT: if (!action.student.id) { let new_student = { id: uuid.s16(), username: action.student.username, email: action.student.email, }; new_state.push(new_student); } else { let find_student = new_state.find((item) => item.id == action.student.id); find_student.username = action.student.username; find_student.email = action.student.email; } localStorage.setItem('listStudent', JSON.stringify(new_state)); return new_state; case types.DELETE_STUDENT: new_state = state.filter((item) => item.id != action.id); localStorage.setItem('listStudent', JSON.stringify(new_state)); return new_state; } return new_state; }; </script> <!-- =========== reducers/listproduct_Reducer.js =========== --> <!-- =========== reducers/index.js =========== --> <script> //Combine nhiều Reducers lại để tạo ra 1 Reducer duy nhất let rootReducer = Redux.combineReducers({ listStudent: listStudent_reducer, //product: productReducer, }); </script> <!-- =========== actions/index.js =========== --> <script> //Các action khi được dispatch ==> sẽ trả về object actions tương ứng let action_saveStudent = (student) => { return { type: types.SAVE_STUDENT, student: student, }; }; let action_deleteStudent = (id) => { return { type: types.DELETE_STUDENT, id: id, }; }; </script> <!-- =========== components/App.js =========== --> <script type="text/babel"> class App extends React.Component { constructor(props) { super(props); this.state = { txtFilterName: '', student: {}, }; } updateState_student = (e) => { let updateStudent = this.state.student; updateStudent[e.target.name] = e.target.value; this.setState({ student: updateStudent, }); }; onFilterStudent = (e) => { e.preventDefault(); this.setState({ txtFilterName: e.target.value, }); }; onNewStudent = (e) => { e.preventDefault(); this.setState({ student: {}, }); }; onEditStudent = (e, student) => { e.preventDefault(); this.setState({ student: { ...student }, }); }; onSaveStudent = (e) => { e.preventDefault(); if (!this.state.student.username || !this.state.student.email) return; this.props.dispatch_saveStudent(this.state.student); //reset state sau khi save xong this.setState({ student: {}, }); }; onDeleteStudent = (e, id) => { e.preventDefault(); this.props.dispatch_deleteStudent(id); }; render() { // console.log(this.props); let filter = this.state.txtFilterName; let tr_listStudent = this.props.listStudent .filter((item) => item.username.includes(filter)) .map((item, index) => { return ( <tr key={item.id}> <td>{index}</td> <td>{item.username}</td> <td>{item.email}</td> <td> <button onClick={(e) => this.onEditStudent(e, item)}>Sửa</button> <button onClick={(e) => this.onDeleteStudent(e, item.id)}>Xóa</button> </td> </tr> ); }); return ( <div> <button onClick={this.onNewStudent}>New Student</button> <br /> <input type="text" placeholder="username" name="username" value={this.state.student.username} onChange={this.updateState_student} /> <br /> <input type="text" placeholder="email" name="email" value={this.state.student.email} onChange={this.updateState_student} /> <br /> <button onClick={this.onSaveStudent}> {this.state.student.id ? 'Update Student' : 'Add Student'} </button> <br /> <br /> <input type="text" placeholder="Search ..." name="txtFilterName" value={this.state.txtFilterName} onChange={this.onFilterStudent} /> <table> <thead> <tr> <th>#</th> <th>Username</th> <th>Email</th> <th>Action</th> </tr> </thead> <tbody>{tr_listStudent}</tbody> </table> </div> ); } } </script> <!-- =========== container/AppContainer.js =========== --> <script type="text/babel"> //Dùng riêng 1 class Container chỉ để mục đích hứng các props từ Redux //Các props hứng được từ Redux lại chuyển tiếp về Component class AppContainer extends React.Component { render() { return ( <App listStudent={this.props.listStudent} product={this.props.product} dispatch_saveStudent={this.props.dispatch_saveStudent} dispatch_deleteStudent={this.props.dispatch_deleteStudent} /> ); } } //check dữ liệu nhận từ store (props) bằng propTypes AppContainer.propTypes = { listStudent: PropTypes.arrayOf( PropTypes.shape({ username: PropTypes.string, email: PropTypes.string, }) ).isRequired, }; //mapStateToProps: chuyển state từ store thành props của component let mapStateToProps_App = (state) => { return { listStudent: state.listStudent, product: state.product, }; }; //mapDispatchToProps: chuyển action từ store thành props của component let mapDispatchToProps_App = (dispatch, props) => { return { dispatch_saveStudent: (student) => { dispatch(action_saveStudent(student)); }, dispatch_deleteStudent: (id) => { dispatch(action_deleteStudent(id)); }, }; }; //connect Component Container với Redux bằng connect let AppConnect = ReactRedux.connect(mapStateToProps_App, mapDispatchToProps_App)(AppContainer); </script> <!-- =========== src/store.js =========== --> <script type="text/babel"> //Gọi store bằng reducers, cái đoạn lằng nhằng là để sử dụng cho redux chrome extensions //const store = Redux.createStore(rootReducer); const store = Redux.createStore( rootReducer /* preloadedState, */, window.__REDUX_DEVTOOLS_EXTENSION__ && window.__REDUX_DEVTOOLS_EXTENSION__() ); </script> <!-- =========== src/index.js =========== --> <script type="text/babel"> //Connect React và Redux bằng Provider, với store=store đã được khai báo ở trên const Provider = ReactRedux.Provider; ReactDOM.render( //Lúc này, không còn gọi class App nữa, mà gọi AppContainer là Appconnect <Provider store={store}> <AppConnect /> </Provider>, document.getElementById('root') ); </script> </body> </html> |
