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| // https://jsfiddle.net/2we0rmox/ | |
| const clear = type => filter => filter.type !== type; | |
| const add = filter => ({ filters }) => { | |
| const current = filters.filter(clear(filter.type)); | |
| return { | |
| filters: !filter.value ? current : current.concat(filter), | |
| }; | |
| }; | |
| const check = item => (status, filter) => | |
| !status ? status : String(item[filter.type]) === String(filter.value); | |
| const apply = filters => item => filters.reduce(check(item), true); | |
| class Something extends React.Component { | |
| state = { | |
| filters: [], | |
| items: [ | |
| { year: 2018, type: 'A' }, | |
| { year: 2017, type: 'A' }, | |
| { year: 2016, type: 'A' }, | |
| { year: 2018, type: 'B' }, | |
| { year: 2017, type: 'B' }, | |
| { year: 2016, type: 'B' }, | |
| { year: 2018, type: 'C' }, | |
| { year: 2017, type: 'C' }, | |
| { year: 2016, type: 'C' }, | |
| ], | |
| }; | |
| filterBy = type => ({ target: { value } }) => | |
| this.setState(add({ type, value })); | |
| getItems = () => { | |
| const { state: { filters, items } } = this; | |
| return items.filter(apply(filters)); | |
| }; | |
| renderItem = ({ year, type }, key) => ( | |
| <li key={key}> | |
| Year: {year} | Type: {type} | |
| </li> | |
| ); | |
| render() { | |
| const { state: { filters }, filterBy, getItems, renderItem } = this; | |
| const items = getItems(); | |
| return ( | |
| <form> | |
| <div> | |
| <span>Filters:</span> | |
| <pre>{JSON.stringify(filters, null, 2)}</pre> | |
| </div> | |
| <div> | |
| <label htmlFor="filter-by-year"> | |
| <span>Year: </span> | |
| <select id="filter-by-year" onChange={filterBy('year')}> | |
| <option value="">Any year</option> | |
| <option value="2018">2018</option> | |
| <option value="2017">2017</option> | |
| <option value="2016">2016</option> | |
| </select> | |
| </label> | |
| </div> | |
| <div> | |
| <label htmlFor="filter-by-type"> | |
| <span>Type: </span> | |
| <select id="filter-by-type" onChange={filterBy('type')}> | |
| <option value="">Any type</option> | |
| <option value="A">Type A</option> | |
| <option value="B">Type B</option> | |
| <option value="C">Type C</option> | |
| </select> | |
| </label> | |
| </div> | |
| <ul>{items.map(renderItem)}</ul> | |
| </form> | |
| ); | |
| } | |
| } | |
| ReactDOM.render(<Something />, document.getElementById('container')); |
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