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May 24, 2018 01:46
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React Sortable Table Exercise
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| <div id="react-content"></div> |
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| class Main extends React.Component { | |
| /* | |
| This exercise should take approximately 1 hour | |
| Use best practices | |
| The resulting app should: | |
| - display the data in a simple table with dynamic column headings | |
| - sort the table by any column ascending or descending order by clicking a column heading | |
| - allow deletion of table rows | |
| - allow adding new items via the form | |
| */ | |
| constructor(props) { | |
| super(props); | |
| this.id_count = 3 | |
| this.state = {}; | |
| this.state.data = [ | |
| {id: 1, name: 'Iron Man', budget: '120000000', rating: 8}, | |
| {id: 2, name: 'Captain America', budget: '130000000', rating: 6}, | |
| {id: 3, name: 'The Hulk', budget: '90000000', rating: 5}, | |
| ]; | |
| this.state.sortKey = 'id'; | |
| this.state.sortAsc = true; | |
| this.state.name = ''; | |
| this.state.budget = ''; | |
| this.state.rating = ''; | |
| this.addFilm = this.addFilm.bind(this); | |
| this.handleInputsChange = this.handleInputsChange.bind(this); | |
| this.deleteFilm = this.deleteFilm.bind(this); | |
| this.deleteFilm = this.deleteFilm.bind(this); | |
| this.sortBy = this.sortBy.bind(this); | |
| } | |
| sortBy(column) { | |
| let { sortKey, sortAsc } = this.state; | |
| sortAsc = !sortAsc; | |
| let sort_result = this.sortByColumn(this.state.data.slice(0), column.target.id, sortAsc) | |
| this.setState({ data: sort_result, sortAsc: sortAsc }); | |
| } | |
| sortByColumn(data, sortKey, sortAsc) { | |
| return data.sort(function (a, b) { | |
| if (sortAsc) { | |
| return a[sortKey] - b[sortKey]; | |
| } else { | |
| return b[sortKey] - a[sortKey]; | |
| } | |
| }); | |
| } | |
| addFilm(event) { | |
| const { name, budget, rating } = this.state; | |
| this.id_count = this.id_count + 1; | |
| this.setState({ data: this.state.data.concat({id: this.id_count, name: name, budget: budget, rating: rating}), name: '', budget: '', rating: '' }); | |
| event.preventDefault(); | |
| } | |
| deleteFilm(film) { | |
| // Delete a film from the table here | |
| const data_deleted = this.state.data.filter( (item) => item.id != film.target.id); | |
| this.setState({ data: data_deleted }); | |
| } | |
| handleInputsChange(e) { | |
| if (e.target.name === "name") { | |
| this.setState({name: e.target.value}) | |
| } else if (e.target.name === "budget") { | |
| this.setState({budget: e.target.value}) | |
| } else { | |
| this.setState({rating: e.target.value}) | |
| } | |
| } | |
| render() { | |
| const data = this.state.data; | |
| const headers = Object.keys(data[0] || []); | |
| return ( | |
| <div key={1}> | |
| <table> | |
| <Headers columns={headers} sortBy={this.sortBy} /> | |
| <tbody> | |
| {data && data.map((item, index) => <Row film={item} deleteFilm={this.deleteFilm} />) } | |
| </tbody> | |
| </table> | |
| <p /> | |
| <form onSubmit={this.addFilm}> | |
| <input type="text" value={this.state.name} name="name" placeholder="name" onChange={this.handleInputsChange} /> | |
| <input type="text" value={this.state.budget} name="budget" placeholder="budget" onChange={this.handleInputsChange} /> | |
| <input type="text" value={this.state.rating} name="rating" placeholder="rating" onChange={this.handleInputsChange} /> | |
| <input type="submit" value="Add" /> | |
| </form> | |
| </div> | |
| ); | |
| } | |
| } | |
| const Headers = ({columns, sortBy}) => { | |
| return ( | |
| <thead> | |
| <tr> | |
| {columns && columns.map( (col, index) => <td className="col-header" key={index} id={col} onClick={sortBy} >{col}</td> )} | |
| </tr> | |
| </thead> | |
| ); | |
| }; | |
| const Row = ({film, deleteFilm}) => { | |
| return ( | |
| <tr> | |
| <td>{film.id}</td> | |
| <td>{film.name}</td> | |
| <td>{film.budget}</td> | |
| <td>{film.rating}</td> | |
| <td id={film.id} className="delete" onClick={deleteFilm}>x</td> | |
| </tr> | |
| ); | |
| }; | |
| ReactDOM.render(<Main />, document.getElementById('react-content')) |
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| <script src="https://cdnjs.cloudflare.com/ajax/libs/react/16.2.0/umd/react.development.js"></script> | |
| <script src="https://cdnjs.cloudflare.com/ajax/libs/react-dom/16.2.0/umd/react-dom.development.js"></script> |
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| table { | |
| border-collapse: collapse; | |
| } | |
| th, td { | |
| border: 1px solid #888; | |
| padding: 3px; | |
| text-align: left; | |
| } | |
| input { | |
| display: block; | |
| margin: 2px 0; | |
| } | |
| .delete { | |
| color: red; | |
| cursor: pointer; | |
| } | |
| .col-header { | |
| font-weight: bold; | |
| } |
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