This component generates a Heatmap display (ribbon) for ontology term summaries (slims). It was designed for summarizing Gene Ontology terms, but it can be used with any ontology.

Getting started

In your React project, add @flybase/react-ontology-ribbon via npm.

npm install @flybase/react-ontology-ribbon

Then you can use it in a React component such as.

import React, { Component } from 'react';
import {render} from 'react-dom';

import Ribbon from '@flybase/react-ontology-ribbon';

class MyClass extends Component {
  constructor() {
    this.state = {
      data: [
        { id: 'GO:12345',
        name: 'a_go_slim_term_name',
        descendant_terms: [
          { id: 'GO:33333', name:'a_descendant_term_1'},
          { id: 'GO:33334', name:'a_descendant_term_2'},
          { id: 'GO:33335', name:'a_descendant_term_3'},


  render() {
    return (
        <Ribbon data={} />

render(<MyClass />, document.querySelector('#root'));


Steps to running the demo locally

git clone
cd react-ontology-ribbon
npm install
npm run start

Browse to whatever URL is indicated on your screen.

Demo source


The Ribbon component takes the following properties.

Name Description Type Default
data The slim terms (see below) Array of objects
heatLevels The number of gradients to use in the heatmap number 8
baseRGB The RGB values that the gradient is based on. Array of RGB numbers [0,96,96]
noResults Content to display if no data is supplied String or custom component
title Label to appear underneath the ribbon String or custom component
onTermClick Callback called when the term is clicked Function
calcHeatColor A function to override the default heat color calculation. Function
itemTitle A function to generate a custom title for each ribbon item. Function Term name: Number of terms

onTermClick callback

This callback is called when the block or text label for the block is clicked.
It is passed the object that represents the slim term as the first argument
and the event object as the second.

const handleOnClick = (term, evt) => {
  console.log("Term ID " +;
  console.log("Term name " +;
  console.log("# Descendant terms " + term.descendant_terms.length);

Then you can add it to your ribbon.

<Ribbon data={mydata} onTermClick={handleOnClick} />


The property calcHeatColor can be used to pass in a custom function that
will be used to calculate the color for the ribbon cell. The function is passed an object
with 4 key variables: numTerms, baseRGB, heatLevels, itemData.

Name Description Type
numTerms The number of descendant terms for this item. number
baseRGB The baseRGB value currently set. Array of RGB numbers
heatLevels The heatLevels currently set. number
itemData The data for the current item being drawn Object
const customColorCalculation = ({numTerms, baseRGB, heatLevels, itemData }) => {
  if ( === 'reproduction') {
    return [120,120,120]
  else if (numTerms > 5) {
    return [0,0,0]
  return [255,255,255]


In order to disable the item title attribute, pass a function that returns an empty string or null.

    title="my title 3"
    itemTitle={() => null}

Data object structure.

The data property takes an array of objects that describes the ontology slim that we are
generating a ribbon for. Each object has 3 properties, an id, a name, and descendant_terms.
The first two properties are strings while descendant_terms is an array of terms contained by
this slim term. The objects in the descendant_terms array must contain an id and name field as well.


    "id": "GO:0023052",
    "name": "signaling",
    "descendant_terms": [
        "id": "GO:0007179",
        "name": "transforming growth factor beta receptor signaling pathway"
        "id": "GO:0030509",
        "name": "BMP signaling pathway"
        "id": "GO:0061353",
        "name": "BMP signaling pathway involved in Malpighian tubule cell chemotaxis"
    "id": "GO:0019538",
    "name": "protein metabolism",
    "descendant_terms": []
    "id": "GO:0050896",
    "name": "response to stimulus",
    "descendant_terms": [
       "id": "GO:0016055",
       "name": "Wnt signaling pathway"