React-calendar-heatmap is a lightweight and customizable calendar heatmap component for React applications. It allows developers to create GitHub-style contribution graphs or any other calendar-based data visualization with ease. The component is highly flexible and can be styled to fit various design requirements.

Pros

• Easy to integrate into existing React projects
• Highly customizable with various props for styling and behavior
• Supports tooltips and click handlers for interactive data exploration
• Lightweight with minimal dependencies

Cons

• Limited to calendar year view, no built-in support for custom date ranges
• Requires additional setup for responsive design
• Documentation could be more comprehensive, especially for advanced use cases
• No built-in support for data fetching or state management

Code Examples

1. Basic usage with default props:

import CalendarHeatmap from 'react-calendar-heatmap';
import 'react-calendar-heatmap/dist/styles.css';

function MyComponent() {
  return (
    <CalendarHeatmap
      startDate={new Date('2023-01-01')}
      endDate={new Date('2023-12-31')}
      values={[
        { date: '2023-01-01', count: 1 },
        { date: '2023-01-22', count: 2 },
        // ... more data
      ]}
    />
  );
}

2. Customizing colors and tooltips:

<CalendarHeatmap
  startDate={new Date('2023-01-01')}
  endDate={new Date('2023-12-31')}
  values={values}
  classForValue={(value) => {
    if (!value) {
      return 'color-empty';
    }
    return `color-scale-${value.count}`;
  }}
  tooltipDataAttrs={(value) => {
    return {
      'data-tip': `${value.date} has count: ${value.count}`,
    };
  }}
/>

3. Adding click handlers:

<CalendarHeatmap
  startDate={new Date('2023-01-01')}
  endDate={new Date('2023-12-31')}
  values={values}
  onClick={(value) => alert(`Clicked on ${value.date} with count: ${value.count}`)}
/>

Getting Started

1. Install the package:

   npm install react-calendar-heatmap
   

2. Import the component and styles in your React application:

   import CalendarHeatmap from 'react-calendar-heatmap';
   import 'react-calendar-heatmap/dist/styles.css';
   

3. Use the component in your JSX:

   <CalendarHeatmap
     startDate={new Date('2023-01-01')}
     endDate={new Date('2023-12-31')}
     values={[
       { date: '2023-01-01', count: 1 },
       { date: '2023-01-22', count: 2 },
       // ... more data
     ]}
   />
   

4. Customize the component using props as needed for your specific use case.