A react component for heatmap in grid layout

by React

react-heatmap-grid

A React component for heatmap in grid layout using div.

Installation

yarn add react-heatmap-grid

or

npm install react-heatmap-grid --save

Usage

Mandatory fields

Name Type Sample
xLabels Array of string ['1am', '2am', '3am']
yLabels Array of string ['Sun', 'Mon']
data 2D Array of numbers having yLabels.length rows and xLabels.length rows [[2,3,5][5,6,9]] 
const xLabels = new Array(24).fill(0).map((_, i) => `${i}`);
const yLabels = ['Sun', 'Mon', 'Tue'];
const data = new Array(yLabels.length)
  .fill(0)
  .map(() => new Array(xLabels.length).fill(0).map(() => Math.floor(Math.random() * 100)));

ReactDOM.render(
  <HeatMap
    xLabels={xLabels}
    yLabels={yLabels}
    data={data}
  />,
  document.getElementById('app')
);

Configuration

Name Type Description Default Value
background string The base color for the heatmap "#329fff"
height number Height of each cell of the heatmap in px 30
onClick function Adds an handler to cell click undefined
squares boolean If set to true will render cells as square false
xLabelWidth number Width of the x label area in pixel 60
yLabelTextAlign string Text alignment of the yLabels "right"
xLabelsLocation string Location of y labels. It can be top or bottom "top"
xLabelsVisibility [boolean] Array of bool conveying which x labels to display. For ex: [true, false, true, false] means the 1st and the 3rd labels will be displayed and the 2nd and 4th will be hidden
unit string Unit to display next to the value on hover
cellRender function Render custom content in cell () => null
cellStyle function To set custom cell style. It is useful for using own colour scheme

Example


const xLabels = new Array(24).fill(0).map((_, i) => `${i}`);

// Display only even labels
const xLabelsVisibility = new Array(24)
  .fill(0)
  .map((_, i) => (i % 2 === 0 ? true : false));

const yLabels = ["Sun", "Mon", "Tue"];
const data = new Array(yLabels.length)
  .fill(0)
  .map(() =>
    new Array(xLabels.length).fill(0).map(() => Math.floor(Math.random() * 100))
  );

ReactDOM.render(
  <HeatMap
    xLabels={xLabels}
    yLabels={yLabels}
    xLabelsLocation={"bottom"}
    xLabelsVisibility={xLabelsVisibility}
    xLabelWidth={50}
    data={data}
    squares
    onClick={(x, y) => alert(`Clicked ${x}, ${y}`)}
    cellStyle={(background, value, min, max, data, x, y) => ({
      background: `rgb(66, 86, 244, ${1 - (max - value) / (max - min)})`,
      fontSize: "11px",
    })}
    cellRender={value => value && `${value}%`}
  />,
  document.getElementById("app")
);

For developers

New build

npm run build

Run dev server

npm run dev

Run test

npm run test

GitHub