10 Best JavaScript Solutions for Creating Leader Lines in Web Applications

21. March 2025

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Visual connections between UI elements are essential in modern web applications. Whether you’re building flowcharts, org charts, mind maps, or just want to highlight relationships between components, leader lines are a powerful visual tool. This post explores 10 top JavaScript libraries that make it easy to connect elements with paths, arrows, and more.

1. Leader Line

Leader Line is one of the most popular dedicated solutions for creating connecting lines between elements. It’s a lightweight and flexible JavaScript library that uses SVG to create visually appealing connections.

Key Features:

Support for various line types: straight, arc, fluid, magnet, and grid paths
Customizable line styles, colors, and effects
Animation capabilities for line creation and movement
Automatic path positioning to avoid obstacles
Works with dynamic elements and repositioning

Usage Example:


// Basic usage
var line = new LeaderLine(
  document.getElementById('start-element'),
  document.getElementById('end-element')
);

// With options
var line = new LeaderLine(
  document.getElementById('start-element'),
  document.getElementById('end-element'),
  {
    color: '#4CAF50',
    size: 3,
    startPlugSize: 2,
    endPlugSize: 2,
    path: 'fluid',
    startPlug: 'disc',
    endPlug: 'arrow2',
    startSocket: 'right',
    endSocket: 'left'
  }
);

// Basic usage

var line = new LeaderLine(

document.getElementById('start-element'),

document.getElementById('end-element')

);

// With options

var line = new LeaderLine(

document.getElementById('start-element'),

document.getElementById('end-element'),

{

color: '#4CAF50',

size: 3,

startPlugSize: 2,

endPlugSize: 2,

path: 'fluid',

startPlug: 'disc',

endPlug: 'arrow2',

startSocket: 'right',

endSocket: 'left'

}

);

NPM Package | Documentation

2. jsPlumb

jsPlumb is a mature, comprehensive solution for creating interactive, connected web applications. It’s been around for years and offers both a free Community Edition and a commercial Toolkit.

Key Features:

Extensive set of connectors, endpoints, and overlay types
Support for drag-and-drop, connection events, and interactivity
Automatic connector path finding and adjustment
Easy integration with frameworks like Angular, React, and Vue
Mature documentation and extensive examples

Usage Example:


// Initialize jsPlumb
jsPlumb.ready(function() {
  var instance = jsPlumb.getInstance();
  
  // Create a connection
  instance.connect({
    source: 'element1',
    target: 'element2',
    anchor: ['Right', 'Left'],
    endpoint: 'Dot',
    connector: ['Flowchart', { cornerRadius: 5 }],
    paintStyle: { stroke: '#5c96bc', strokeWidth: 2 },
    overlays: [
      ['Arrow', { location: 1, width: 12, length: 12 }]
    ]
  });
});

// Initialize jsPlumb

jsPlumb.ready(function() {

var instance = jsPlumb.getInstance();

// Create a connection

instance.connect({

source: 'element1',

target: 'element2',

anchor: ['Right', 'Left'],

endpoint: 'Dot',

connector: ['Flowchart', { cornerRadius: 5 }],

paintStyle: { stroke: '#5c96bc', strokeWidth: 2 },

overlays: [

['Arrow', { location: 1, width: 12, length: 12 }]

]

});

Community Edition | Toolkit (Commercial)

3. React Flow

React Flow is a powerful library for building node-based UIs and diagrams, specifically designed for React applications. While primarily focused on node-based diagrams, it excels at creating connections between elements.

Key Features:

React-specific implementation with hooks and components
Responsive and interactive diagram creation
Built-in zoom, pan, and element selection
Customizable edge (connection) types and styles
TypeScript support and excellent documentation

Usage Example:


import React from 'react';
import ReactFlow, { 
  Background, 
  Controls,
  MiniMap
} from 'react-flow-renderer';

const elements = [
  // Nodes
  { id: '1', data: { label: 'Node 1' }, position: { x: 250, y: 5 } },
  { id: '2', data: { label: 'Node 2' }, position: { x: 100, y: 100 } },
  
  // Connection
  { id: 'e1-2', source: '1', target: '2', animated: true, type: 'smoothstep' }
];

const Flow = () => (
  <div style={{ height: 500 }}>
    <ReactFlow elements={elements} />
  </div>
);

import React from 'react';

import ReactFlow, {

Background,

Controls,

MiniMap

} from 'react-flow-renderer';

const elements = [

// Nodes

{ id: '1', data: { label: 'Node 1' }, position: { x: 250, y: 5 } },

{ id: '2', data: { label: 'Node 2' }, position: { x: 100, y: 100 } },

// Connection

{ id: 'e1-2', source: '1', target: '2', animated: true, type: 'smoothstep' }

];

const Flow = () => (

</div>

);

Website | GitHub

4. GoJS

GoJS is a comprehensive diagramming library for building interactive diagrams in JavaScript. While it’s a commercial product, it offers powerful features for creating connections between elements.

Key Features:

Extensive diagram types and templates
Advanced linking capabilities and routing algorithms
Support for complex interactions and customizations
Data binding and integration with frameworks
Excellent performance even with large diagrams

Usage Example:


// Initialize diagram
var diagram = new go.Diagram("myDiagramDiv");

// Define node template
diagram.nodeTemplate =
  new go.Node("Auto")
    .add(new go.Shape("RoundedRectangle", { fill: "white" })
    .add(new go.TextBlock({ margin: 8 })
      .bind("text", "key"));

// Define link template
diagram.linkTemplate =
  new go.Link({ routing: go.Link.AvoidsNodes })
    .add(new go.Shape())
    .add(new go.Shape({ toArrow: "Standard" }));

// Create model and data
diagram.model = new go.GraphLinksModel(
  [
    { key: "Alpha" },
    { key: "Beta" }
  ],
  [
    { from: "Alpha", to: "Beta" }
  ]
);

// Initialize diagram

var diagram = new go.Diagram("myDiagramDiv");

// Define node template

diagram.nodeTemplate =

new go.Node("Auto")

.add(new go.Shape("RoundedRectangle", { fill: "white" })

.add(new go.TextBlock({ margin: 8 })

.bind("text", "key"));

// Define link template

diagram.linkTemplate =

new go.Link({ routing: go.Link.AvoidsNodes })

.add(new go.Shape())

.add(new go.Shape({ toArrow: "Standard" }));

// Create model and data

diagram.model = new go.GraphLinksModel(

[

{ key: "Alpha" },

{ key: "Beta" }

[

{ from: "Alpha", to: "Beta" }

]

);

Website | Samples

5. D3.js

D3.js is a powerful data visualization library that can be used to create custom connections between elements. While not specifically designed for leader lines, its flexibility makes it a great choice for complex visualization needs.

Key Features:

Complete control over visual representation and behavior
SVG-based with powerful animation capabilities
Excellent for data-driven visualizations
Extensive community and examples
Highly customizable line and path generation

Usage Example:


// Create SVG container
const svg = d3.select("#container")
  .append("svg")
  .attr("width", 600)
  .attr("height", 400);

// Define path generator
const linkGenerator = d3.linkHorizontal()
  .x(d => d.x)
  .y(d => d.y);

// Create a path between two points
svg.append("path")
  .attr("d", linkGenerator({
    source: { x: 100, y: 100 },
    target: { x: 400, y: 300 }
  }))
  .attr("fill", "none")
  .attr("stroke", "#000")
  .attr("stroke-width", 2);

// Create SVG container

const svg = d3.select("#container")

.append("svg")

.attr("width", 600)

.attr("height", 400);

// Define path generator

const linkGenerator = d3.linkHorizontal()

.x(d => d.x)

.y(d => d.y);

// Create a path between two points

svg.append("path")

.attr("d", linkGenerator({

source: { x: 100, y: 100 },

target: { x: 400, y: 300 }

}))

.attr("fill", "none")

.attr("stroke", "#000")

.attr("stroke-width", 2);

Website | GitHub

6. JointJS

JointJS is a powerful diagramming library that excels at creating interactive diagrams with connections. It offers both an open-source core library and a commercial version with additional features.

Key Features:

Comprehensive set of built-in shapes and link types
Support for custom elements and connections
Interaction with elements and links through events
Serialization and deserialization of diagrams
Compatible with all major JavaScript frameworks

Usage Example:


// Create the paper and graph
var graph = new joint.dia.Graph();
var paper = new joint.dia.Paper({
  el: document.getElementById('paper'),
  model: graph,
  width: 800,
  height: 600,
  gridSize: 10,
  background: { color: '#f8f9fa' }
});

// Create elements
var rect1 = new joint.shapes.standard.Rectangle({
  position: { x: 100, y: 100 },
  size: { width: 100, height: 40 },
  attrs: { body: { fill: '#3498db' }, label: { text: 'Element 1' } }
});

var rect2 = new joint.shapes.standard.Rectangle({
  position: { x: 400, y: 200 },
  size: { width: 100, height: 40 },
  attrs: { body: { fill: '#2ecc71' }, label: { text: 'Element 2' } }
});

// Create a link between elements
var link = new joint.shapes.standard.Link({
  source: { id: rect1.id },
  target: { id: rect2.id },
  attrs: {
    line: {
      stroke: '#333333',
      'stroke-width': 2,
      targetMarker: { type: 'path', d: 'M 10 -5 0 0 10 5 Z' }
    }
  }
});

// Add elements and link to the graph
graph.addCells([rect1, rect2, link]);

// Create the paper and graph

var graph = new joint.dia.Graph();

var paper = new joint.dia.Paper({

el: document.getElementById('paper'),

model: graph,

width: 800,

height: 600,

gridSize: 10,

background: { color: '#f8f9fa' }

});

// Create elements

var rect1 = new joint.shapes.standard.Rectangle({

position: { x: 100, y: 100 },

size: { width: 100, height: 40 },

attrs: { body: { fill: '#3498db' }, label: { text: 'Element 1' } }

});

var rect2 = new joint.shapes.standard.Rectangle({

position: { x: 400, y: 200 },

size: { width: 100, height: 40 },

attrs: { body: { fill: '#2ecc71' }, label: { text: 'Element 2' } }

});

// Create a link between elements

var link = new joint.shapes.standard.Link({

source: { id: rect1.id },

target: { id: rect2.id },

attrs: {

line: {

stroke: '#333333',

'stroke-width': 2,

targetMarker: { type: 'path', d: 'M 10 -5 0 0 10 5 Z' }

}

});

// Add elements and link to the graph

graph.addCells([rect1, rect2, link]);

Website | GitHub

7. MxGraph

MxGraph is the library that powers the popular Diagrams.net (formerly Draw.io) diagramming tool. While no longer actively maintained, it remains a powerful and widely-used solution for creating complex diagrams with connections.

Key Features:

Rich set of features for diagram creation
Extensive link styling and customization options
Support for complex connection routing
Highly customizable and extensible
Proven in production with Diagrams.net

Usage Example:


// Create a graph instance
var container = document.getElementById('graph-container');
var graph = new mxGraph(container);

// Enable features
graph.setConnectable(true);
graph.setAllowDanglingEdges(false);

// Get default parent
var parent = graph.getDefaultParent();

// Begin graph update
graph.getModel().beginUpdate();
try {
  // Create vertices
  var v1 = graph.insertVertex(parent, null, 'Element 1', 20, 20, 120, 60);
  var v2 = graph.insertVertex(parent, null, 'Element 2', 240, 150, 120, 60);
  
  // Create edge (connection)
  var e1 = graph.insertEdge(parent, null, '', v1, v2);
} finally {
  // End graph update
  graph.getModel().endUpdate();
}

// Create a graph instance

var container = document.getElementById('graph-container');

var graph = new mxGraph(container);

// Enable features

graph.setConnectable(true);

graph.setAllowDanglingEdges(false);

// Get default parent

var parent = graph.getDefaultParent();

// Begin graph update

graph.getModel().beginUpdate();

try {

// Create vertices

var v1 = graph.insertVertex(parent, null, 'Element 1', 20, 20, 120, 60);

var v2 = graph.insertVertex(parent, null, 'Element 2', 240, 150, 120, 60);

// Create edge (connection)

var e1 = graph.insertEdge(parent, null, '', v1, v2);

} finally {

// End graph update

graph.getModel().endUpdate();

}

GitHub | Documentation

8. Cytoscape.js

Cytoscape.js is an open-source graph theory library for visualization and analysis. It’s particularly well-suited for network graphs and relationship visualizations.

Key Features:

Graph theory library with visualization capabilities
Support for large graphs with many elements and connections
Advanced layouts and algorithms for positioning
Customizable styles for nodes and edges
Mobile-friendly touch interactions

Usage Example:


// Initialize cytoscape
var cy = cytoscape({
  container: document.getElementById('cy'),
  elements: [
    // Nodes
    { data: { id: 'a', label: 'Node A' } },
    { data: { id: 'b', label: 'Node B' } },
    
    // Edge
    { data: { id: 'ab', source: 'a', target: 'b', label: 'connects to' } }
  ],
  style: [
    {
      selector: 'node',
      style: {
        'background-color': '#666',
        'label': 'data(label)'
      }
    },
    {
      selector: 'edge',
      style: {
        'width': 3,
        'line-color': '#ccc',
        'target-arrow-color': '#ccc',
        'target-arrow-shape': 'triangle',
        'curve-style': 'bezier',
        'label': 'data(label)'
      }
    }
  ],
  layout: {
    name: 'grid'
  }
});

// Initialize cytoscape

var cy = cytoscape({

container: document.getElementById('cy'),

elements: [

// Nodes

{ data: { id: 'a', label: 'Node A' } },

{ data: { id: 'b', label: 'Node B' } },

// Edge

{ data: { id: 'ab', source: 'a', target: 'b', label: 'connects to' } }

style: [

{

selector: 'node',

style: {

'background-color': '#666',

'label': 'data(label)'

}

{

selector: 'edge',

style: {

'width': 3,

'line-color': '#ccc',

'target-arrow-color': '#ccc',

'target-arrow-shape': 'triangle',

'curve-style': 'bezier',

'label': 'data(label)'

}

layout: {

name: 'grid'

}

});

Website | GitHub

9. vis-network

vis-network is part of the vis.js visualization library, specifically designed for displaying networks of nodes and edges. It’s excellent for creating interactive network diagrams with connections.

Key Features:

Specialized for network visualizations
Physics-based layouts and interactions
Customizable node and edge styles
Support for large datasets
Clustering and hierarchical structuring

Usage Example:


// Create nodes and edges
var nodes = new vis.DataSet([
  { id: 1, label: "Node 1" },
  { id: 2, label: "Node 2" }
]);

var edges = new vis.DataSet([
  { from: 1, to: 2, arrows: "to" }
]);

// Create a network
var container = document.getElementById("network");
var data = {
  nodes: nodes,
  edges: edges
};
var options = {
  edges: {
    smooth: {
      type: 'cubicBezier',
      forceDirection: 'horizontal',
      roundness: 0.4
    }
  },
  physics: {
    enabled: true,
    repulsion: {
      centralGravity: 0.0,
      springLength: 200,
      springConstant: 0.05,
      nodeDistance: 100,
      damping: 0.09
    }
  }
};
var network = new vis.Network(container, data, options);

// Create nodes and edges

var nodes = new vis.DataSet([

{ id: 1, label: "Node 1" },

{ id: 2, label: "Node 2" }

]);

var edges = new vis.DataSet([

{ from: 1, to: 2, arrows: "to" }

]);

// Create a network

var container = document.getElementById("network");

var data = {

nodes: nodes,

edges: edges

};

var options = {

edges: {

smooth: {

type: 'cubicBezier',

forceDirection: 'horizontal',

roundness: 0.4

}

physics: {

enabled: true,

repulsion: {

centralGravity: 0.0,

springLength: 200,

springConstant: 0.05,

nodeDistance: 100,

damping: 0.09

}

};

var network = new vis.Network(container, data, options);

Website | GitHub

10. Flowchart.js

Flowchart.js is a simple yet effective library for creating SVG flowcharts from textual definitions. While more specialized, it’s perfect for creating structured diagrams with connecting lines.

Key Features:

Text-based flowchart definition
SVG-based rendering
Simple and intuitive syntax
Automatic layout and connection routing
Lightweight and easy to integrate

Usage Example:


// Define flowchart
var diagram = flowchart.parse(`
  st=>start: Start
  e=>end: End
  op1=>operation: Operation 1
  op2=>operation: Operation 2
  cond=>condition: Yes or No?

  st->op1->cond
  cond(yes)->op2->e
  cond(no)->op1
`);

// Render to SVG
diagram.drawSVG('diagram');

// Define flowchart

var diagram = flowchart.parse(`

st=>start: Start

e=>end: End

op1=>operation: Operation 1

op2=>operation: Operation 2

cond=>condition: Yes or No?

st->op1->cond

cond(yes)->op2->e

cond(no)->op1

`);

// Render to SVG

diagram.drawSVG('diagram');

Website | GitHub

FAQ

What is Leader-line and how does it work?

Leader-line is a lightweight JavaScript library that creates SVG-based connecting lines between HTML elements. It supports straight, arc, fluid, magnet, and grid path types, making it ideal for flowcharts and diagrams. You simply specify the start and end elements, and the library handles the rendering and positioning.

How do I install and use Leader-line in my project?

Install Leader-line via npm with


npm install leader-line

npm install leader-line

or include it directly in your HTML with


<script src="https://cdn.jsdelivr.net/npm/leader-line@1.0.7/leader-line.min.js"></script>

. Basic usage:


new LeaderLine(startElement, endElement, options);

new LeaderLine(startElement, endElement, options);

What are the alternatives to Leader-line for connecting HTML elements?

Popular alternatives include:

jsPlumb – Comprehensive library with many connector types and styling options
Drawflow – Simple library for creating flow diagrams
jQuery Connections – Lightweight solution for connecting DOM elements
SVG.js – General SVG manipulation library that can create connectors
React Flow – For React applications with node-based interfaces

How do I customize the appearance of connecting lines?

Most libraries offer extensive styling options. For Leader-line, you can customize:

Color:

color: 'blue'

1
2
3

color: 'blue'
Line size:

size: 3

1
2
3

size: 3
Line style (solid, dashed):

dash: {animation: true}

1
2
3

dash: {animation: true}
Start/end shapes:

startSocket: 'top', endSocket: 'bottom'

1
2
3

startSocket: 'top', endSocket: 'bottom'
Arrowheads:

endPlug: 'arrow1'

1
2
3

endPlug: 'arrow1'

JsPlumb and other alternatives have similar customization options.

How can I make connected elements draggable?

Most connection libraries can be integrated with draggable elements. For Leader-line, listen for drag events and update the line:


element.addEventListener('drag', function() {
  line.position();
});

element.addEventListener('drag', function() {

line.position();

});

JsPlumb has built-in draggable support with the


jsPlumb.draggable()

jsPlumb.draggable()

method.

How do I handle lines when the page scrolls?

For Leader-line, you need to reposition the lines on scroll events:


window.addEventListener('scroll', function() {
  line.position();
});

window.addEventListener('scroll', function() {

line.position();

});

JsPlumb automatically handles scroll events in most cases, but you may need to call


jsPlumb.repaintEverything()

jsPlumb.repaintEverything()

for complex scenarios.

How do I integrate Leader-line with front-end frameworks like React or Angular?

For React, use refs to get DOM elements and create lines in useEffect:


const startRef = useRef(null);
const endRef = useRef(null);

useEffect(() => {
  if (startRef.current && endRef.current) {
    const line = new LeaderLine(startRef.current, endRef.current);
    return () => line.remove();
  }
}, []);

const startRef = useRef(null);

const endRef = useRef(null);

useEffect(() => {

if (startRef.current && endRef.current) {

const line = new LeaderLine(startRef.current, endRef.current);

return () => line.remove();

}

}, []);

For Angular, use ViewChild to access elements and create lines in ngAfterViewInit.

Can I create multiple connection points on a single element?

Yes, most libraries support this. In Leader-line, specify different attachment points:


new LeaderLine(
  LeaderLine.pointAnchor(element1, { x: '50%', y: 0 }),
  LeaderLine.pointAnchor(element2, { x: 0, y: '50%' })
);

new LeaderLine(

LeaderLine.pointAnchor(element1, { x: '50%', y: 0 }),

LeaderLine.pointAnchor(element2, { x: 0, y: '50%' })

);

JsPlumb supports this with its endpoint system:


jsPlumb.addEndpoint(element, { anchor: "Top" })

jsPlumb.addEndpoint(element, { anchor: "Top" })

How do I implement line routing to avoid element overlaps?

Leader-line offers path options to help with routing:


new LeaderLine(element1, element2, {
  path: 'grid',
  startSocket: 'right',
  endSocket: 'left'
});

new LeaderLine(element1, element2, {

path: 'grid',

startSocket: 'right',

endSocket: 'left'

});

JsPlumb provides the “StateMachine” connector that implements intelligent routing, and “Flowchart” connectors that can route around obstacles with corner radius settings.

What’s the performance difference between these libraries?

Performance varies:

Leader-line: Lightweight with good performance for up to 100 connections
jsPlumb: More feature-rich but heavier, optimized for complex diagrams
jQuery Connections: Simple and lightweight but with fewer features
SVG.js approaches: Can be highly optimized but require more manual implementation

For large diagrams with hundreds of connections, custom SVG solutions might be more performant.

How can I add labels or data to connecting lines?

Leader-line supports middle labels:


const line = new LeaderLine(element1, element2);
line.setMiddleLabel('Connection Label');

const line = new LeaderLine(element1, element2);

line.setMiddleLabel('Connection Label');

JsPlumb has robust label support:


jsPlumb.connect({
  source: element1, 
  target: element2,
  overlays: [
    ["Label", { label: "connection label", location: 0.5 }]
  ]
});

jsPlumb.connect({

source: element1,

target: element2,

overlays: [

["Label", { label: "connection label", location: 0.5 }]

]

});

Are these libraries responsive for mobile devices?

Most modern connection libraries work on mobile devices, but require additional handling:

Update positions on window resize events
Consider touch events for interactive elements
Adjust line sizes and styling for smaller screens

For Leader-line, listen for resize events:


window.addEventListener('resize', function() {
  line.position();
});

window.addEventListener('resize', function() {

line.position();

});

Thoughts

Whether you need simple leader lines to connect UI elements or complex interactive diagrams, these JavaScript libraries offer a range of solutions to fit your specific needs. From the dedicated Leader Line library for simple connections to comprehensive diagramming tools like GoJS and JointJS, you can find the right tool for your project requirements.

When choosing a library, consider factors like:

Framework compatibility (React, Angular, Vue, etc.)
Performance with large numbers of connections
Customization and styling options
Learning curve and documentation
Commercial vs. open-source licensing

By leveraging these libraries, you can create visually appealing and interactive connections between elements in your web applications, enhancing user experience and information clarity.

Happy connecting!

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10 Best JavaScript Solutions for Creating Leader Lines in Web Applications

Table of Contents

1. Leader Line

2. jsPlumb

3. React Flow

4. GoJS

5. D3.js

6. JointJS

7. MxGraph

8. Cytoscape.js

9. vis-network

10. Flowchart.js

FAQ

What is Leader-line and how does it work?

How do I install and use Leader-line in my project?

What are the alternatives to Leader-line for connecting HTML elements?

How do I customize the appearance of connecting lines?

How can I make connected elements draggable?

How do I handle lines when the page scrolls?

How do I integrate Leader-line with front-end frameworks like React or Angular?

Can I create multiple connection points on a single element?

How do I implement line routing to avoid element overlaps?

What’s the performance difference between these libraries?

How can I add labels or data to connecting lines?

Are these libraries responsive for mobile devices?

Thoughts

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