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Create a Gauge in React Native using FusionCharts

Overview

FusionCharts is a JavaScript charting library that enables you to create interactive charts, gauges, maps and dashboards in JavaScript. We have built a simple and lightweight React Native component which provides bindings for FusionCharts. The react-native-fusioncharts component allows you to easily add rich and interactive charts to any React Native project.

In this page, we'll see how to install FusionCharts and render a map using the react-native-fusioncharts component.

Installation

Install FusionCharts and the react-native-fusioncharts component using any of the following methods:

Step 1: To install fusioncharts and the react-native-fusioncharts component via npm follow the steps below:
1. Install the react-native-fusioncharts module

    $ npm install react-native-fusioncharts --save
2. Install the fusioncharts JS files

    $ npm install fusioncharts --save
Step 2: To setup the react-native-fusioncharts component for Android, follow the steps given below:
  • Create a folder named assets under android/app/src/main directory if it doesn't exist.
  • Copy FusionCharts library files (node_modules/fusioncharts folder) in the assets folder.
  • Create a fusioncharts.html file in assets folder. Include the FusionCharts library files in fusioncharts.html file using <script> tag.
    • 
<!DOCTYPE html>
<html>

<head>
    <title>FusionCharts</title>
    <meta http-equiv="content-type" content="text/html; charset=utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=no" />

    <style type="text/css">
        body,
        html {
            margin: 0;
            padding: 0;
            overflow: hidden;
            font-size: 13px;
        }

        #chart-container {
            width: 100%;
            height: 100%;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            position: absolute;
            user-select: none;
            -webkit-user-select: none;
            overflow: hidden;
        }

        #loading-text {
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            -webkit-transform: translate(-50%, -50%);
            user-select: none;
            -webkit-user-select: none;
        }
    </style>
</head>

<body>
    <div id="chart-container">
        <div id="loading-text">
            Chart is loading...
        </div>
    </div>

    <script type='text/javascript'>
        "use strict";
        (function() {
            var a = Promise.resolve(),
                b = {},
                c = {};
            (function d() {
                var f = function() {
                    function g() {
                        return Math.floor(65536 * (1 + Math.random())).toString(16).substring(1)
                    }
                    return g() + g() + "-" + g() + "-" + g() + "-" + g() + "-" + g() + g() + g()
                };
                window.webViewBridge = {
                    send: function send(g, h, i, j) {
                        i = i || function() {}, j = j || function() {};
                        var k = {
                                targetFunc: g,
                                data: h || {},
                                msgId: f()
                            },
                            l = JSON.stringify(k);
                        a = a.then(function() {
                            return new Promise(function(m, n) {
                                b[k.msgId] = {
                                    resolve: m,
                                    reject: n
                                }, c[k.msgId] = {
                                    onsuccess: i,
                                    onerror: j
                                }, window.postMessage(l)
                            })
                        }).catch(function() {})
                    }
                }, window.document.addEventListener("message", function(g) {
                    var h;
                    try {
                        h = JSON.parse(g.data)
                    } catch (i) {
                        return
                    }
                    b[h.msgId] && (b[h.msgId].resolve(), delete b[h.msgId]), h.args && c[h.msgId] && (h.isSuccessfull ? c[h.msgId].onsuccess.apply(null, h.args) : c[h.msgId].onerror.apply(null, h.args), delete c[h.msgId])
                })
            })()
        })();
    </script>

    <!-- Include the required FusionCharts modules -->
    <script type="text/javascript" src="fusioncharts/fusioncharts.js"></script>
    <script type="text/javascript" src="path/to/local/fusioncharts/latest/fusioncharts.maps.js"></script>
        <script type="text/javascript" src="path/to/local/fusioncharts/latest/fusioncharts.world.js"></script>
    <script type="text/javascript" src="fusioncharts/themes/fusioncharts.theme.fusion.js"></script>

</body>

</html>
  • Set libraryPath property to the FusionCharts component.
    • 
<FusionCharts 
......
libraryPath={{ uri: 'file:///android_asset/fusioncharts.html' }}/>
  • Add the following script in Application's package.json file to bundle your assets when you want to generate a signed APK.
    • 
"scripts": {
    ......
    "clean:build:android": "rm -rf android/app/build",
    "prod:android": "npm run clean:build:android  && react-native bundle --platform android --dev false --entry-file index.js --bundle-output android/app/src/main/assets/index.android.bundle --assets-dest android/app/src/main/res"
},
  • Run the following command before genarating the signed APK:
    • 
$ npm run prod:android
Step 1: To install fusioncharts and the react-native-fusioncharts component via npm follow the steps below:
1. Install the react-native-fusioncharts module

    $ npm install react-native-fusioncharts --save
2. Install the fusioncharts JS files

    $ npm install fusioncharts --save
Step 2: To setup the react-native-fusioncharts component for iOS, follow the steps given below:
  • Create a folder named assets in your project root if it doesn't exist.
  • Copy FusionCharts library files in the assets folder.
  • Create a fusioncharts-tpl.html file in assets folder. Include the FusionCharts library files in fusioncharts.html file using <script> tag.
    • 
<!DOCTYPE html>
<html>

<head>
    <!-- Include the required FusionCharts modules -->
    <script type="text/javascript" src="fusioncharts/fusioncharts.js"></script>
    <script type="text/javascript" src="path/to/local/fusioncharts/latest/fusioncharts.maps.js"></script>
        <script type="text/javascript" src="path/to/local/fusioncharts/latest/fusioncharts.world.js"></script>
    <script type="text/javascript" src="fusioncharts/themes/fusioncharts.theme.fusion.js"></script>
</head>

<body></body>

</html>
  • Add a build"assets script in Application's package.json file
    • 
"scripts": {
    ......
    "build:assets": "fc-build-assets --fc-template ./assets/fusioncharts-tpl.html --fc-library ./assets/fusioncharts"
},
  • The --fc-library ./assets/fusioncharts is required when you copy FusionCharts library files in your assets folder.
    Note: fc-build-assets is a utility binary provided by react-native-fusioncharts to package the FusionCharts modules(.js files) referenced in template(.html file) as needed by the React Native iOS build process.
  • Run the following command before running the application:
    • 
$ npm run build:assets

That completes the installation of FusionCharts and the react-native-fusioncharts component.

Create your First map

In this section, we will create a visualization using the World Map showing the average annual population growth.

FusionCharts will load here..

The data for this chart is represented in the table below:

State Entity Name Value
North America NA 82
South America SA 2.04
Asia AS 1.78
Europe EU 40
Africa AF 2.58
Australia AU 1.30

Convert tabular data into JSON format

Now that you have the tabular data ready, it's time to convert it into JSON format, as FusionCharts accepts data in JSON or XML format.

In the above table, the column Entity Name represents the geographical entities represented in the map, whose full names are given in the State column.

However, when you convert the data into a format (JSON or XML) supported by FusionCharts, the entities are denoted by the id key in the data object.

For any map visualization, it is important to provide the correct value for the id keys. For example, if you want to denote Africa, the value for the corresponding id must be AF and not AFR.

We have a detailed Map Specification Sheetsfor all the maps that can be rendered using FusionCharts, where you can find the correct id of the maps you want to create.

In this example, we will use the JSON format, as shown below:

{
    // Map Configuration
    "chart": {
            "caption": "Average Annual Population Growth",
            "subcaption": " 1955-2015",
            "numbersuffix": "%",
            "includevalueinlabels": "1",
            "labelsepchar": ": ",
            "entityFillHoverColor": "#FFF9C4",
            "theme": "fusion"
    },
    // Aesthetics; ranges synced with the slider
    "colorrange": {
        "minvalue": "0",
        "code": "#FFE0B2",
        "gradient": "1",
        "color": [{
            "minvalue": "0.5",
            "maxvalue": "1.0",
            "color": "#FFD74D"
        }, {
            "minvalue": "1.0",
            "maxvalue": "2.0",
            "color": "#FB8C00"
        }, {
            "minvalue": "2.0",
            "maxvalue": "3.0",
            "color": "#E65100"
        }]
    },
    // Source data as JSON --> id represents countries of world.
    "data": [{
        "id": "NA",
        "value": ".82",
        "showLabel": "1"
    }, {
        "id": "SA",
        "value": "2.04",
        "showLabel": "1"
    }, {
        "id": "AS",
        "value": "1.78",
        "showLabel": "1"
    }, {
        "id": "EU",
        "value": ".40",
        "showLabel": "1"
    }, {
        "id": "AF",
        "value": "2.58",
        "showLabel": "1"
    }, {
        "id": "AU",
        "value": "1.30",
        "showLabel": "1"
    }]
}

In the above JSON data:

  • Create the chart object to define the elements of the map.

  • Create the colorRange array to set the color associated with the specific range of values.

  • Specify minValue and maxValue within the color array under the colorRange array.

  • Create the data array to define the id of the continents and their corresponding values along with configurations.

The chart object and the respective arrays contain a set of key-value pairs known as attributes. These attributes are used to set the functional and cosmetic properties of the map.

Now that you have converted the tabular data to JSON format, let's learn how to render the map.

Render the map

To render the map follow the steps below:

  1. Include react

  2. Include react-native-fusioncharts component

  3. Define the chart configuration in a JSON.

    • Set the map as world. For World map, the alias is world. Find the complete list of map with their respective alias here.
    • Set the width and height (in pixels).
    • Set the dataFormat as json.
    • Embed the json data as the value of the dataSource.

  4. Specify the location of fusioncharts.html for Android and iOS.

  5. Add style to the container of the chart.

The JavaScript code to create a chart in Android and iOS is same.

Copy the following code to app.js file.

import React, { Component } from 'react';
import { Platform, StyleSheet, Text, View } from 'react-native';
import FusionCharts from 'react-native-fusioncharts';

export default class DrillDown extends Component {
    constructor(props) {
        super(props);
        this.apiCaller = null;
        this.state = {
            type: 'world',
            width: '800',
            height: '550',
            dataFormat: 'json',
            dataSource: {
            // Map Configuration
                "chart": {
                        "caption": "Average Annual Population Growth",
                        "subcaption": " 1955-2015",
                        "numbersuffix": "%",
                        "includevalueinlabels": "1",
                        "labelsepchar": ": ",
                        "entityFillHoverColor": "#FFF9C4",
                        "theme": "fusion"
                },
                // Aesthetics; ranges synced with the slider
                "colorrange": {
                    "minvalue": "0",
                    "code": "#FFE0B2",
                    "gradient": "1",
                    "color": [{
                        "minvalue": "0.5",
                        "maxvalue": "1.0",
                        "color": "#FFD74D"
                    }, {
                        "minvalue": "1.0",
                        "maxvalue": "2.0",
                        "color": "#FB8C00"
                    }, {
                        "minvalue": "2.0",
                        "maxvalue": "3.0",
                        "color": "#E65100"
                    }]
                },
                // Source data as JSON --> id represents countries of world.
                "data": [{
                    "id": "NA",
                    "value": ".82",
                    "showLabel": "1"
                }, {
                    "id": "SA",
                    "value": "2.04",
                    "showLabel": "1"
                }, {
                    "id": "AS",
                    "value": "1.78",
                    "showLabel": "1"
                }, {
                    "id": "EU",
                    "value": ".40",
                    "showLabel": "1"
                }, {
                    "id": "AF",
                    "value": "2.58",
                    "showLabel": "1"
                }, {
                    "id": "AU",
                    "value": "1.30",
                    "showLabel": "1"
                }]
            }
        };
        this.libraryPath = Platform.select({
            // Specify fusioncharts.html file location
            android: { uri: 'file:///android_asset/fusioncharts.html' },
            ios: require('./assets/fusioncharts.html')
        });
    }

    render() {
        return (
            <View style={styles.container}>
                <Text style={styles.header}>A Simple Gauge</Text>
                <View style={styles.chartContainer}>
                <FusionCharts
                type={this.state.type}
                width={this.state.width}
                height={this.state.height}
                dataFormat={this.state.dataFormat}
                dataSource={this.state.dataSource}
                libraryPath={this.libraryPath}
                />
                </View>
            </View>
        );
    }
}

const styles = StyleSheet.create({
    container: {
        flex: 1,
        padding: 10
    },
    header: {
        fontWeight: 'bold',
        fontSize: 20,
        textAlign: 'center',
        paddingBottom: 10
    },
    chartContainer: {
        height: 400,
        borderColor: '#000',
        borderWidth: 1
    }
});

That's it! Your first map using react-native-fusioncharts is ready.

Render other maps

To reduce the size of the package FusionCharts comes with only two maps, i.e., the World map and the USA map. However, FusionCharts provide 1600+ maps for you to explore. Download the map files separately if you want to save them locally.

Let's create a map of California to show the "Web visits for a particular month" as shown below:

FusionCharts will load here..

To render the above map, first install fusionmaps package which contains all the map definition files as shown below:

$ npm install fusionmaps

After installing fusionmaps package, the code to render the map of California is:

import React, { Component } from 'react';
import { Platform, StyleSheet, Text, View } from 'react-native';
import FusionCharts from 'react-native-fusioncharts';

export default class DrillDown extends Component {
    constructor(props) {
        super(props);
        this.apiCaller = null;
        this.state = {
            type: 'maps/california',
            width: '800',
            height: '550',
            dataFormat: 'json',
            dataSource: {
                "chart": {
                    "animation": "0",
                    "showbevel": "0",
                    "usehovercolor": "1",
                    "showlegend": "1",
                    "legendposition": "BOTTOM",
                    "legendborderalpha": "0",
                    "legendbordercolor": "ffffff",
                    "legendallowdrag": "0",
                    "legendshadow": "0",
                    "caption": "Website Visits for the month of March 2018",
                    "connectorcolor": "000000",
                    "fillalpha": "80",
                    "hovercolor": "CCCCCC",
                    "theme": "fusion"
                },
                "colorrange": {
                    "minvalue": "0",
                    "startlabel": "Low",
                    "endlabel": "High",
                    "code": "e44a00",
                    "gradient": "1",
                    "color": [{"maxvalue": "2500", "code": "f8bd19"}, {"maxvalue": "5000", "code": "6baa01"}]
                },
                "data": [{"id":"001","value":2834},{"id":"003","value":3182},{"id":"005","value":3280},{"id":"007","value":911},{"id":"009","value":292},{"id":"011","value":530},{"id":"013","value":2515},{"id":"015","value":728},{"id":"017","value":1974},{"id":"019","value":848},{"id":"021","value":3278},{"id":"023","value":4463},{"id":"025","value":1198},{"id":"027","value":378},{"id":"029","value":2610},{"id":"031","value":1200},{"id":"033","value":3820},{"id":"035","value":940},{"id":"037","value":3416},{"id":"039","value":4004},{"id":"041","value":1604},{"id":"043","value":4011},{"id":"045","value":3203},{"id":"047","value":3775},{"id":"049","value":2721},{"id":"051","value":3417},{"id":"053","value":1530},{"id":"055","value":412},{"id":"057","value":3434},{"id":"059","value":1670},{"id":"061","value":1274},{"id":"063","value":4339},{"id":"065","value":2073},{"id":"067","value":1018},{"id":"069","value":3967},{"id":"071","value":3401},{"id":"073","value":3307},{"id":"075","value":1938},{"id":"077","value":489},{"id":"079","value":3207},{"id":"081","value":2295},{"id":"083","value":2747},{"id":"085","value":1114},{"id":"087","value":3400},{"id":"089","value":784},{"id":"091","value":1673},{"id":"093","value":4274},{"id":"095","value":4509},{"id":"097","value":3862},{"id":"099","value":1356},{"id":"101","value":4126},{"id":"103","value":1314},{"id":"105","value":1807},{"id":"107","value":4026},{"id":"109","value":3456},{"id":"111","value":1393},{"id":"113","value":1500},{"id":"115","value":2218}]
            }
        };
        this.libraryPath = Platform.select({
            // Specify fusioncharts.html file location
            android: { uri: 'file:///android_asset/fusioncharts.html' },
            ios: require('./assets/fusioncharts.html')
        });
    }

    render() {
        return (
            <View style={styles.container}>
                <Text style={styles.header}>A Simple Gauge</Text>
                <View style={styles.chartContainer}>
                <FusionCharts
                type={this.state.type}
                width={this.state.width}
                height={this.state.height}
                dataFormat={this.state.dataFormat}
                dataSource={this.state.dataSource}
                libraryPath={this.libraryPath}
                />
                </View>
            </View>
        );
    }
}

const styles = StyleSheet.create({
    container: {
        flex: 1,
        padding: 10
    },
    header: {
        fontWeight: 'bold',
        fontSize: 20,
        textAlign: 'center',
        paddingBottom: 10
    },
    chartContainer: {
        height: 400,
        borderColor: '#000',
        borderWidth: 1
    }
});

That's it! The California map is ready.