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June 25, 2019 03:27
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Nested Category Listing Sample in React
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <title></title> | |
| <style type="text/css"> | |
| ul { | |
| list-style-type: none; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <div id="root"></div> | |
| <script crossorigin src="https://unpkg.com/react@16/umd/react.development.js"></script> | |
| <script crossorigin src="https://unpkg.com/react-dom@16/umd/react-dom.development.js"></script> | |
| <script src="https://cdnjs.cloudflare.com/ajax/libs/babel-standalone/6.21.1/babel.min.js"></script> | |
| <script type="text/babel"> | |
| const mixedNestedCategories = [ | |
| { id: 1 }, | |
| { id: 5 }, | |
| { id: 2, pid: 1 }, | |
| { id: 3, pid: 1 }, | |
| { id: 4, pid: 2 }, | |
| { id: 6, pid: 1 }, | |
| { id: 7, pid: 5 } | |
| ]; | |
| const Task = props => { | |
| const [state, setState] = React.useState({ categories: [], subCategories: {} }); | |
| const onMount = () => { | |
| const subCategories = {}; | |
| const categories = []; | |
| const mapCallback = row => { | |
| if (!row.pid) { | |
| categories.push(row); | |
| } else { | |
| if (!subCategories[row.pid]) subCategories[row.pid] = []; | |
| subCategories[row.pid].push(row); | |
| } | |
| } | |
| props.mixedNestedCategories.map(mapCallback); | |
| setState({ categories, subCategories }); | |
| } | |
| React.useEffect(onMount, []) | |
| const renderList = row => { | |
| const subCategories = state.subCategories[row.id]; | |
| if (subCategories) { | |
| return ( | |
| <li key={row.id}> | |
| > {row.id} | |
| <ul> | |
| {subCategories.map(renderList)} | |
| </ul> | |
| </li> | |
| ); | |
| } | |
| return ( | |
| <li key={row.id}> | |
| > {row.id} | |
| </li> | |
| ); | |
| } | |
| return ( | |
| <div> | |
| <h1>Display Categories</h1> | |
| <ul> | |
| {state.categories.map(renderList)} | |
| </ul> | |
| </div> | |
| ); | |
| } | |
| ReactDOM.render(<Task mixedNestedCategories={mixedNestedCategories} />, document.getElementById('root')); | |
| </script> | |
| </body> | |
| </html> |
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