react-heatmap-grid

A React component for heatmap in grid layout using div.

Live example here.

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| |yLabelWidth|number|Width of the y label area in pixel|40| |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|| |title|function|To render custom title in each cell|${value} ${unit}|

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: `rgba(66, 86, 244, ${1 - (max - value) / (max - min)})`,
      fontSize: "11px",
    })}
    cellRender={value => value && `${value}%`}
    title={(value, unit) => `${value}`}
  />,
  document.getElementById("app")
);

For developers

New build

npm run build

Run dev server

npm run dev

Run test

npm run test