30秒学会 React 片段 – MappedTable

Renders a table with rows dynamically created from an array of objects and a list of property names.

• Use Object.keys(), Array.prototype.filter(), Array.prototype.includes() and Array.prototype.reduce() to produce a filteredData array, containing all objects with the keys specified in propertyNames.
• Render a <table> element with a set of columns equal to the amount of values in propertyNames.
• Use Array.prototype.map to render each value in the propertyNames array as a <th> element.
• Use Array.prototype.map to render each object in the filteredData array as a <tr> element, containing a <td> for each key in the object.

This component does not work with nested objects and will break if there are nested objects inside any of the properties specified in propertyNames

代码实现

function MappedTable({ data, propertyNames }) {
  let filteredData = data.map(v =>
    Object.keys(v)
      .filter(k => propertyNames.includes(k))
      .reduce((acc, key) => ((acc[key] = v[key]), acc), {})
  );
  return (
    <table>
      <thead>
        <tr>
          {propertyNames.map(val => (
            <th key={`h_${val}`}>{val}</th>
          ))}
        </tr>
      </thead>
      <tbody>
        {filteredData.map((val, i) => (
          <tr key={`i_${i}`}>
            {propertyNames.map(p => (
              <td key={`i_${i}_${p}`}>{val[p]}</td>
            ))}
          </tr>
        ))}
      </tbody>
    </table>
  );
}

使用样例

const people = [
  { name: 'John', surname: 'Smith', age: 42 },
  { name: 'Adam', surname: 'Smith', gender: 'male' }
];
const propertyNames = ['name', 'surname', 'age'];
ReactDOM.render(
  <MappedTable data={people} propertyNames={propertyNames} />,
  document.getElementById('root')
);