react-archer

🏹 Draw arrows between DOM elements in React 🖋

Installation

npm install react-archer --save or yarn add react-archer

Example

Try it out!

import { ArcherContainer, ArcherElement } from 'react-archer';

const rootStyle = { display: 'flex', justifyContent: 'center' };
const rowStyle = { margin: '200px 0', display: 'flex', justifyContent: 'space-between' };
const boxStyle = { padding: '10px', border: '1px solid black' };

const App = () => {
  return (
    <div style={{ height: '500px', margin: '50px' }}>
      <ArcherContainer strokeColor="red">
        <div style={rootStyle}>
          <ArcherElement
            id="root"
            relations={[
              {
                targetId: 'element2',
                targetAnchor: 'top',
                sourceAnchor: 'bottom',
                style: { strokeDasharray: '5,5' },
              },
            ]}
          >
            <div style={boxStyle}>Root</div>
          </ArcherElement>
        </div>

        <div style={rowStyle}>
          <ArcherElement
            id="element2"
            relations={[
              {
                targetId: 'element3',
                targetAnchor: 'left',
                sourceAnchor: 'right',
                style: { strokeColor: 'blue', strokeWidth: 1 },
                label: <div style={{ marginTop: '-20px' }}>Arrow 2</div>,
              },
            ]}
          >
            <div style={boxStyle}>Element 2</div>
          </ArcherElement>

          <ArcherElement id="element3">
            <div style={boxStyle}>Element 3</div>
          </ArcherElement>

          <ArcherElement
            id="element4"
            relations={[
              {
                targetId: 'root',
                targetAnchor: 'right',
                sourceAnchor: 'left',
                label: 'Arrow 3',
              },
            ]}
          >
            <div style={boxStyle}>Element 4</div>
          </ArcherElement>
        </div>
      </ArcherContainer>
    </div>
  );
};

export default App;

API

ArcherContainer

Props

Instance methods

If you access to the ref of your ArcherContainer, you will access the refreshScreen method. This will allow you to have more control on when you want to re-draw the arrows.

ArcherElement

The Relation type has the following shape:

{
  targetId: string,
  targetAnchor: 'top' | 'bottom' | 'left' | 'right' | 'middle',
  sourceAnchor: 'top' | 'bottom' | 'left' | 'right' | 'middle',
  label: React.Node,
  order?: number, // higher order means arrow will be drawn on top of the others
  className?: string, // CSS class selectors on the SVG arrow
  style: ArcherStyle,
  domAttributes?: DOMAttributes<SVGElement>, // Allows to make selectable arrows by passing dom attributes like onMouseHover
  cursor?: Property.Cursor, // Allows to customize the hovering cursor of the arrow. Will only work if domAttributes is present
  hitSlop?: number, // Allows to make the selectable arrow thicker. Will only work if domAttributes is present
}

Please note that the middle anchor does not look very good: the curve won't look nice and the arrow marker will have a little offset. The issue won't be solved before a long time.

The ArcherStyle type has the following shape:

{
  strokeColor: string,
  strokeWidth: number,
  strokeDasharray: number,
  noCurves: boolean,
  lineStyle: string,
  endShape: Object,
  startMarker: boolean,
  endMarker: boolean,
}

Troubleshooting

My arrows don't re-render correctly...

Try using the refreshScreen instance method on your ArcherContainer element. You can access it through the ref of the component.

Call refreshScreen when the event that you need is triggered (onScroll etc.).