react-xarrows

introduction

Draw arrows between components in React!

Main features

• Connect arrows/lines between components just by passing an id or ref!
• Super simple API yet fully customizable usage!
• Smart and Intuitive look and behavior!
• Smart React lifecycle, and cached parsed props for efficiency!

liked my work? star this repo.

reallyy liked my work? buy me a coffee!
this project needs funding to stay open source and free :blush:

installation

with npm npm install react-xarrows. (or yarn add react-xarrows)

Examples

Demos

see here! codebox of few examples(in this repo at /examples).

see this interactive example: https://lwwwp.csb.app/CustomizeArrow

simple example:

import React, {useRef} from "react";
import Xarrow from "react-xarrows";

const boxStyle = {border: "grey solid 2px", borderRadius: "10px", padding: "5px"};

function SimpleExample() {
    const box1Ref = useRef(null);
    return (
        <div style={{display: "flex", justifyContent: "space-evenly", width: "100%"}}>
            <div ref={box1Ref} style={boxStyle}>hey</div>
            <p id="elem2" style={boxStyle}>hey2</p>
            <Xarrow
                start={box1Ref} //can be react ref
                end="elem2" //or an id
            />
        </div>
    );
}

export default SimpleExample;

V2 example

in order to invoke updates on xarrows wrap your arrows and connceted elements with Xwrapper, and consume useXarrow on connected elements.

import React from 'react';
import Xarrow, {useXarrow, Xwrapper} from 'react-xarrows';
import Draggable from 'react-draggable';

const boxStyle = {border: 'grey solid 2px', borderRadius: '10px', padding: '5px'};

const DraggableBox = ({id}) => {
    const updateXarrow = useXarrow();
    return (
        <Draggable onDrag={updateXarrow} onStop={updateXarrow}>
            <div id={id} style={boxStyle}>
                {id}
            </div>
        </Draggable>
    );
};

export function V2Example() {
    return (
        <div style={{display: 'flex', justifyContent: 'space-evenly', width: '100%'}}>
            <Xwrapper>
                <DraggableBox id={'elem1'}/>
                <DraggableBox id={'elem2'}/>
                <Xarrow start={'elem1'} end="elem2"/>
            </Xwrapper>
        </div>
    );
}

import React from 'react';
import Xarrow, {useXarrow, xarrowPropsType, Xwrapper} from 'react-xarrows';
import Draggable from 'react-draggable';

const boxStyle = {
    border: '1px #999 solid',
    borderRadius: '10px',
    textAlign: 'center',
    width: '100px',
    height: '30px',
    color: 'black',
    alignItems: 'center',
    display: 'flex',
    justifyContent: 'center',
} as const;

const canvasStyle = {
    width: '100%',
    height: '100vh',
    background: 'white',
    overflow: 'auto',
    display: 'flex',
    color: 'black',
} as const;

const DraggableBox = ({box}) => {
    const updateXarrow = useXarrow();
    return (
        <Draggable onDrag={updateXarrow} onStop={updateXarrow}>
            <div id={box.id} style={{...boxStyle, position: 'absolute', left: box.x, top: box.y}}>
                {box.id}
            </div>
        </Draggable>
    );
};

const SimpleTemplate = () => {
    const box = {id: 'box1', x: 20, y: 20};
    const box2 = {id: 'box2', x: 320, y: 120};
    const box3 = {id: 'box3', x: 50, y: 150};
    const box4 = {id: 'box4', x: 320, y: 220};
    return (
        <div style={canvasStyle} id="canvas">
            <Xwrapper>
                <DraggableBox box={box}/>
                <DraggableBox box={box2}/>
                <Xarrow start={'box1'} end={'box2'}/>
                <Xarrow start={'box1'} end={'box2'} endAnchor={'top'}/>
                <Xarrow start={'box1'} end={'box2'} startAnchor={'bottom'}/>
            </Xwrapper>
            <Xwrapper>
                <DraggableBox box={box3}/>
                <DraggableBox box={box4}/>
                <Xarrow start={'box3'} end={'box4'}/>
            </Xwrapper>
        </div>
    );
};

(will render this)

Usage

react-xarrow v2.0 released! no need to trigger render on parents anymore!
react-xarrows will smartly trigger updates on relevant elements! use Xwrapper and useXarrow hook to achieve selective rendering!

please note that v2.0.0 is not working using react StrictMode. to fix update to v2.0.1.

breaking changes

V2.0 introduced some breaking changes, mainly related to properties naming. see CHANGELOG.md for details.

useXarrow

import {useXarrow} from "react-xarrow"

const YourComponent = ({id, ...props}) => {
    const updateXarrow = useXarrow()
    //...
    return (
        <div id={id}>
            ...
        </div>
    )

}

Xwrapper

const YourApp = () => {
    return (
        // ...
        <Xwrapper>
            <YourComponent id={'comp1'}/>
            <YourComponent id={'comp2'}/>
            <Xarrow start={'comp1'} end={'comp2'}/>
        </Xwrapper>
        // ...
    )
}

each time component calling useXarrow hook renders also the xarrows inside the wrapping Xwrapper wrapper will render. receiving updateXarrow is optional. use this function only if you want to trigger a render different phase from rendering(like click or drag event).

API

to see full typescript definition see types.ts file.

here's a summary of the all the available props:

Properties|Description|default value|type :-----:|:-----:|:-----:|:-----: start|ref to start element|none(Required!)|string/ReactRef end|ref to end element|none(Required!)|string/ReactRef startAnchor|from which side the arrow should start from start element| 'auto'|string/object/array endAnchor|at which side the arrow should end at end element| 'auto'|string/object/array labels|optional labels| null|string/array color|color of Xarrow(all parts)| 'CornflowerBlue'|string lineColor|color of the line| null|string headColor|color of the head| null|string tailColor|color of the tail| null|string strokeWidth|thickness of Xarrow(all parts)|4|number headSize|thickness of head(relative to strokeWidth)|6|number tailSize|thickness of tail(relative to strokeWidth)|6|number path|path drawing style| 'smooth'|string curveness|how much the line curveness when path='smooth'| 0.8|number gridBreak|where the line breaks in path='grid'| "50%" | string dashness|should the line be dashed| false|boolean/object showHead|show the arrow head?| true|boolean showTail|show the arrow tail?| false|boolean showXarrow|show Xarrow?| true|boolean animateDrawing|animate drawing when arrow mounts?| false|boolean/object headShape|shape of the arrow head| 'arrow1'|string/object tailShape|shape of the arrow tail|'arrow1'|string/object zIndex|zIndex - Overlapping elements with a larger z-index cover those with a smaller one|0|number

see details

Properties|Description|default value|type :-----:|:-----:|:-----:|:-----: passProps|properties which will be pased to arrowBody,arrowHead,arrowTail| {}|object SVGcanvasProps|properties which will be passed to svgCanvas| {}|object arrowBodyProps|properties which will be passed to arrowBody| {}|object arrowHeadProps|properties which will be passed to arrowHead| {}|object arrowTailProps|properties which will be passed to arrowTail| {}|object divContainerProps|properties which will be passed to divContainer| {}|object SVGcanvasStyle|style properties which will be passed svgCanvas|0|object divContainerStyle|style properties which will be passed divContainer| false|object _extendSVGcanvas|extend svgCanas at all sides|0|number _debug|show debug elements|0|boolean _cpx1Offset|offset control point 1 x|0|number _cpy1Offset|offset control point 1 y|0|number _cpx2Offset|offset control point 2 x|0|number _cpy2Offset|offset control point 2 x|0|number

API flexibility

This API built in such way that most props can accept different types. you can keep things simple or provide more custom props for more custom behavior(see startAnchor good example). explore typescript for detailed descriptions of what type excepts every prop.

Properties

This documentation is examples driven.
The examples sorted from the most common use case to the most custom one.

required
can be a reference to a react ref to html element or string - an id of a DOM element.

examples:

• start="myid" - myid is id of a dom element.
• start={myRef} - myRef is a react ref.

specify what anchors are allowed. can be a string/object/array.

type:

export type anchorType = anchorPositionType | anchorCustomPositionType;

simple usage:

type:

export const tAnchorEdge = ['middle', 'left', 'right', 'top', 'bottom', 'auto'] as const;
export type anchorPositionType = typeof tAnchorEdge[number];

one of "auto" | "middle" | "left" | "right" | "top" | "bottom" auto will choose automatically the path with the smallest length.

example:

• endAnchor="middle" will set the anchor of the end of the line to the middle of the end element.
• endAnchor="auto" choose the closest anchor.
• endAnchor="left" connect to the left.

custom usage:

type:

export type anchorCustomPositionType = {
    position: anchorPositionType;
    offset: { x?: number; y?: number };
};

example:

• endAnchor= { position: "auto", offset: { x: 20 } } will choose automatic anchoring for end anchor but will offset it 20 pixels to the right after normal positioning.

if list is provided - the minimal length anchors will be chosen from the list. example:

• endAnchor= ["right", {position: "left", offset: {y: -10}}] only right and left anchors will be allowed for endAnchor, and if the left side connected then it will be offset 10 pixels up.

you can place up to 3 labels. see examples

• labels="middleLabel" - middle label
• labels=<div style={{ fontSize: "1.3em", fontFamily: "fantasy", fontStyle: "italic" }}>styled middle label</div>
  • custom middle label
• labels={{ start:"I'm start label",middle: "middleLabel",end:<div style={{ fontSize: "1.3em", fontFamily: "fantasy", fontStyle: "italic" }}>big end label</div> }} start and middle label and custom end label

color defines color to the entire arrow. lineColor,headColor and tailColor will override color specifically for line,tail or head. examples:

• color="red" will change the color of the arrow to red(body and head).
• headColor="red" will change only the color of the head to red.
• tailColor="red" will change only the color of the tail to red.
• lineColor="red" will change only the color of the body to red.

strokeWidth defines the thickness of the entire arrow. headSize and tailSize defines how big will be the head or tail relative to the strokeWidth. examples:

• strokeWidth={15} will make the arrow more thick(body and head).
• headSize={15} will make the head of the arrow more thick(relative to strokeWidth as well).
• tailSize={15} will make arrow's tail thicker.

path can be one of: "smooth" | "grid" | "straight", and it controls the path arrow is drawn, exactly how their name suggest. examples:

• path={"grid"} will draw the line in sharp curves(90 degrees) like grid.

defines how much the lines curve. makes a difference only in path='smooth'. examples:

• curveness={false} will make the line straight without curves(exactly like path='straight').
• curveness={true} will choose default values of curveness.
• curveness={2} will make Xarrow extra curved.

defines where the line will break when path='grid'.

examples:

• gridBreak='20%' the line would break closer to start element(20% of the path instead of 50%).
• gridBreak='50' the line would break 50 pixel from start element.
• gridBreak='20%50' the line would break 50 pixel after 20% from start element.
• gridBreak='100%-50' the line would break 50 pixel before end element.

can make the arrow dashed and can even animate. if true default values(for dashness) are chosen. if object is passed then default values are chosen except what passed. examples:

• dashness={true} will make the line of the arrow to be dashed.
• dashness={{ strokeLen: 10, nonStrokeLen: 15, animation: -2 }} will make a custom looking dashness.

showXarrow: show or not show Xarrow? (can be used to restart the drawing animation) showHead: show or not the arrow head? showTail: show or not the arrow tail?

• showXarrow={false} - will hide (unmount) Xarrow and his labels.
• showHead={false} - will hide the arrow head.

can animate the drawing of the arrow using svg animation. type: boolean|number. if true animation duration is 1s. if number is passed then animation duration is number's value in seconds. examples:

• animateDrawing will animate the drawing of the arrow in 1 second.
• animateDrawing={5} will animate the drawing of the arrow in 5 seconds.
• animateDrawing={0.1} will animate the drawing of the arrow in 100 milliseconds.

you can customize the svg edges (head or tail) of the arrow. you can use predefined svg by passing string,one of "arrow1" | "circle" | "heart"

simple usage:

headShape type:string

<xarrow headShape='circle'/>

<xarrow headShape='circle'
        arrowHeadProps={"fill": "transparent",
            "strokeWidth": "0.1",
            "stroke": "CornflowerBlue"}
/>

<xarrow headShape='heart'/>

you can import arrowShapes which is object contains all predefined svg shapes.

you can also pass your own svg shapes:

type svgElemType = "circle" | "ellipse" | "line" | "path" | "polygon" | "polyline" | "rect"
type headShapeType<T extends svgElemType> = {
    svgElem: SVGElementTagNameMap[T];
    offsetForward?: number;
};

for example, you can pass the following object, and it will be exactly equivalent to passing 'arrow1':

const headShapeArrow1 = {svgElem: <path d="M 0 0 L 1 0.5 L 0 1 L 0.25 0.5 z"/>, offsetForward: 0.25}
// then pass it Xarrow
<Xarrow headShape={headShapeArrow1}/>

svgElem - a jsx of svg element like path or circle(can also imported svg element from file).
offsetForward - how much to offset tht line into the svg element(from 0 to 1). normally the line will connect to the start of the svgElem. for example in case of the default arrow you want the line to enter 25% into the svgElem.

don't forget about arrowHeadProps and arrowTailProps in case you want to use default shape but custom svg props.

in case you pass a custom svg element: currently you have to adjust the path to start from 0,0 and to be at size box 1x1 in order to make the custom shape look like the default shapes in size.

advanced customization

passing props

The xarrow is fully customizable, and you can pass props to any part of the component. if unlisted(unknown) property is passed to xarrow so by default it'll be passed down to divContainer.

passProps

you can pass properties to visible parts(body and head) of the arrow (such event handlers and much more). this supposed to be enough for most cases. examples:

• passProps= {{onClick: () => console.log("xarrow clicked!")}} - now the arrow will console log a message when clicked.
• passProps= {{cursor: "pointer"}} - now the cursor will change to pointer style when hovering over Xarrow.
• passProps= {{pointerEvents: "none"}} - now the user cannot interact with Xarrow via mouse events.

advanced customization

The properties below can be used to customize the arrow even farther:

arrowBodyProps, arrowHeadProps, SVGcanvasProps, divContainerProps

if you wish you can pass props specific part of the component.

• divContainerProps - the container which contains the SVG canvas, and the optional labels elements. It takes no place, and located where you normaly placed him in the elements tree(no offset). The SVGcanvas and the labels will be placed in a offset from this div.
• SVGcanvasProps - the svg canvas which contains arrow head and body.
• arrowBodyProps - the body of the arrow
• arrowHeadProps - the arrow head.

Note that arrowBody and arrowHead receives props of svg path element, SVGcanvas receives props of svg element, and divContainerProps of a div element.

examples:

• arrowHead = {onClick: () => console.log("head clicked!")} - now only the head will console log a message when clicked.

SVGcanvasStyle, divContainerStyle

if you wish to pass style to divContainer or SVGcanvas use SVGcanvasStyle,divContainerStyle and not SVGcanvasProps ,divContainerProps to not override existing style.

_extendSVGcanvas

will extend the svg canvas at all sides. can be useful if for some reason the arrow is cut though to small svg canvas( should be used in advanced custom arrows). example: _extendSVGcanvas = {30} - will extend svg canvas in all sides by 30 pixels.

_cpx1Offset,_cpy1Offset,_cpx2Offset,_cpy2Offset

now you can manipulate and offset the control points of the arrow. this way you can control how the line curves. check out the interactive codesandbox, set _debug to true and play with these properties.

Donation

It takes many hours to develop and maintain this library, and it is not funded by any company or commercial organization.

If you/your company are using this project, please consider donating.
Any donation will help me to devote more time to the development of this project.

Contributing

Want a feature that is not supported? found a bug?
no need to clone the repo and set up the dev environment anymore!
here's a ready to use development environment with a click of a button(patience, it takes about a minute to setup):

this will set up environment that will clone react-xarrow master,and will link the code from the src to the examples, and will start examples,with typescript watch process that will recompile when any change is made.
this means that any code changes in src/* will immediately be reflected to the running example at port 3000! (add console.log("test") line and see!)
to reproduce this dev env on your local machine git clone and follow same commands as in gitpod.yml.

if you made an improvement that is relevant for most users, you can quickly submit a pull request.
Please always pull request from and into dev branch - here's Gitpod

Versions

See CHANGELOG.md in this repo.