JavaScript Data Grid Conditional formatting

Overview
Example of conditional formatting
Related articles
- Related guides
- Related API reference

Overview

Conditional formatting can be used to set the font, color, typeface, etc., for cell content and can also be used to format the style of a cell, all based on a predefined set of criteria.

Example of conditional formatting

This demo shows how to use the cell type renderer feature to make some conditional formatting:

The first row is read-only and formatted as bold green text.
All cells in the Nissan column are formatted as italic text.
Empty cells are formatted with a silver background.
Negative numbers are formatted as red text.

const container = document.getElementById('example1');

const data = [
  ['', 'Tesla', 'Nissan', 'Toyota', 'Honda'],
  ['2017', -5, '', 12, 13],
  ['2018', '', -11, 14, 13],
  ['2019', '', 15, -12, 'readOnly']
];

function firstRowRenderer(instance, td, row, col, prop, value, cellProperties) {
  Handsontable.renderers.TextRenderer.apply(this, arguments);
  td.style.fontWeight = 'bold';
  td.style.color = 'green';
  td.style.background = '#CEC';
}

function negativeValueRenderer(instance, td, row, col, prop, value, cellProperties) {
  Handsontable.renderers.TextRenderer.apply(this, arguments);

  // if the row contains a negative number
  if (parseInt(value, 10) < 0) {
    // add class 'make-me-red'
    td.className = 'make-me-red';
  }

  if (!value || value === '') {
    td.style.background = '#EEE';

  } else {
    if (value === 'Nissan') {
      td.style.fontStyle = 'italic';
    }

    td.style.background = '';
  }
}
// maps function to a lookup string
Handsontable.renderers.registerRenderer('negativeValueRenderer', negativeValueRenderer);

const hot = new Handsontable(container, {
  data: data,
  licenseKey: 'non-commercial-and-evaluation',
  height: 'auto',
  afterSelection(row, col, row2, col2) {
    const meta = this.getCellMeta(row2, col2);

    if (meta.readOnly) {
      this.updateSettings({fillHandle: false});

    } else {
      this.updateSettings({fillHandle: true});
    }
  },
  cells(row, col) {
    const cellProperties = {};
    const data = this.instance.getData();

    if (row === 0 || data[row] && data[row][col] === 'readOnly') {
      cellProperties.readOnly = true; // make cell read-only if it is first row or the text reads 'readOnly'
    }

    if (row === 0) {
      cellProperties.renderer = firstRowRenderer; // uses function directly

    } else {
      cellProperties.renderer = 'negativeValueRenderer'; // uses lookup map
    }

    return cellProperties;
  }
});

<script src="https://cdn.jsdelivr.net/npm/handsontable@12.1/dist/handsontable.full.min.js"></script>
<link type="text/css" rel="stylesheet" href="https://cdn.jsdelivr.net/npm/handsontable@12.1/dist/handsontable.full.min.css" /> 

<div id="example1" class="hot "></div>

Formatting cells

Configuration options:
Plugins:
- CustomBorders

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