@reactabular/virtualized

@reactabular/virtualized works in conjunction with reactabular-sticky and provides virtualization. The idea is that instead of rendering all table cells, it renders only ones visible at the viewport. This improves performance significantly with larger datasets.

If you want extra logging during development, set window.LOG_VIRTUALIZED = true at console.

Example:

/*
import React from 'react';
import * as Sticky from 'reactabular-sticky';
import * as Virtualized from 'reactabular-virtualized';
import * as resolve from 'table-resolver';

import { generateRows } from './helpers';
*/

const columns = [
  {
    property: 'id',
    props: {
      style: { minWidth: 50 }
    },
    header: {
      label: 'Index'
    },
    cell: {
      formatters: [
        (value, { rowIndex }) => <span>{rowIndex}</span>
      ]
    }
  },
  {
    property: 'name',
    props: {
      style: { minWidth: 300 }
    },
    header: {
      label: 'Name'
    }
  },
  {
    property: 'age',
    props: {
      style: { minWidth: 100 }
    },
    header: {
      label: 'Age'
    }
  },
  {
    property: 'company',
    props: {
      style: { minWidth: 400 }
    },
    header: {
      label: 'Company'
    }
  },
  {
    property: 'product',
    props: {
      style: { minWidth: 400 }
    },
    header: {
      label: 'Product'
    }
  }
];

const schema = {
  type: 'object',
  properties: {
    id: {
      type: 'string'
    },
    name: {
      type: 'string'
    },
    product: {
      type: 'string'
    },
    company: {
      type: 'string'
    },
    age: {
      type: 'integer'
    }
  },
  required: ['id', 'name', 'product', 'company', 'age']
};
// Resolving indices is an optional step. You can skip it if you don't
// rely on rowIndex anywhere. But if you do, it's good to calculate and
// include to the data. Reactabular's rendering logic is able to pick it
// up by convention (`_index` field).
const rows = resolve.resolve({ columns })(generateRows(1000, schema));

class VirtualizedTable extends React.Component {
  constructor(props) {
    super(props);

    this.state = {
      rows,
      columns
    };

    this.tableHeader = null;
    this.tableBody = null;
  }
  componentDidMount() {
    // We have refs now. Force update to get those to Header/Body.
    this.forceUpdate();
  }
  render() {
    return (
      <div>
        <div>
          <label>Scroll to index: </label>
          <input
            type="text"
            onChange={e => this.tableBody.scrollTo(e.target.value)}
          />
        </div>

        <Table.Provider
          className="pure-table pure-table-striped"
          columns={columns}
          renderers={{
            body: {
              wrapper: Virtualized.BodyWrapper,
              row: Virtualized.BodyRow
            }
          }}
        >
          <Sticky.Header
            style={{
              maxWidth: 800
            }}
            ref={tableHeader => {
              this.tableHeader = tableHeader && tableHeader.getRef();
            }}
            tableBody={this.tableBody}
          />

          <Virtualized.Body
            rows={rows}
            rowKey="id"
            style={{
              maxWidth: 800
            }}
            height={400}
            ref={tableBody => {
              this.tableBody = tableBody && tableBody.getRef();
            }}
            tableHeader={this.tableHeader}
          />
        </Table.Provider>
      </div>
    );
  }
}

<VirtualizedTable />

Scrolling to Index

Virtualized.Body ref exposes scrollTo method for scrolling through index. If you want to scroll based on some field value, search the dataset first and pass the resulting index here.

Define the Height of Table

Please note height of <Virtualized.Body> must be defined. If height is not defined, style.maxHeight will be used. In below example, we use style.maxHeight instead of height,

/*
import React from 'react';
import * as Sticky from 'reactabular-sticky';
import * as Virtualized from 'reactabular-virtualized';

import { generateRows } from './helpers';
*/

const columns = [
  {
    property: 'id',
    props: {
      style: { minWidth: 350 }
    },
    header: {
      label: 'Index'
    }
  },
  {
    property: 'name',
    props: {
      style: { minWidth: 300 }
    },
    header: {
      label: 'Name'
    }
  }
];
const schema = {
  type: 'object',
  properties: {
    id: {
      type: 'string'
    },
    name: {
      type: 'string'
    }
  },
  required: ['id', 'name']
};
const rows = generateRows(1000, schema);

class VirtualizedTable extends React.Component {
  constructor(props) {
    super(props);

    this.state = {
      rows,
      columns
    };

    this.tableHeader = null;
    this.tableBody = null;
  }
  componentDidMount() {
    // We have refs now. Force update to get those to Header/Body.
    this.forceUpdate();
  }
  render() {
    return (
      <div>
        <Table.Provider
          className="pure-table pure-table-striped"
          columns={columns}
          renderers={{
            body: {
              wrapper: Virtualized.BodyWrapper,
              row: Virtualized.BodyRow
            }
          }}
        >
          <Sticky.Header
            style={{
              maxWidth: 800
            }}
            ref={tableHeader => {
              this.tableHeader = tableHeader && tableHeader.getRef();
            }}
            tableBody={this.tableBody}
          />

          <Virtualized.Body
            rows={rows}
            rowKey="id"
            style={{
              maxWidth: 800,
              maxHeight: 400
            }}
            ref={tableBody => {
              this.tableBody = tableBody && tableBody.getRef();
            }}
            tableHeader={this.tableHeader}
          />
        </Table.Provider>
      </div>
    );
  }
}

<VirtualizedTable />

Using relative column widths

You can define column widths as percentages of the table's width, like so:

const columns = [
  {
    property: 'id',
    props: {
      style: { width: "35%" }
    },
    ...

To force rows to stretch to the full width of the tbody container, however, a flex-based styling workaround is required. This StackOverflow answer suggests the configuration below. If this does not work for you, due to other styling constraints or concerns about browser compatibility, you may consider the other answers posted there, or you may need to take care of your column sizing and resizing in JavaScript.

{
  display: flex;
  flex-flow: column;

  thead,
  tbody tr {
    display: table;
    table-layout: fixed;
  }

  thead {
    flex: 0 0 auto;
    width: 100%;
    background: #eaeaea;
    tr {
      width: calc(100% - 0.9em); /* 0.9em approximates scrollbar width */
      display: table;
    }
  }

  tbody {
    display: block;
    flex: 1 1 auto;
    overflow-y: scroll;

    tr {
      width: 100%;
    }
  }
}