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How to add Chart to your Ionic Angular App

Written by on 2 July 2018

Monday

2

July 2018

1

COMMENTS

Feature image for How to add doughnut chart to your ionic app technbuzz.com

You need to add chart to you ionic angular app. What are the options.

Ngx Charts

It has a great online demo. Looking at the demo you have dozen of different chart choices. From Bar Chart to Line Chart to Pie Chart. I think it also comes with two color schemes i-e Light and Dark. 

Adding Ngx Charts to your Ionic App

Ngx Chart uses d3 behind the scenes, it’s kind of an angular wrapper around d3 with some svg animations. It’s documentation is very straight forward on how to install it to your app. I tried to install it but it had some weird dependency issues that I could not solve. That’s why I have skip it and found ng2-charts.

Ng2 Charts

It uses canvas unlike ngx charts which uses d3 and svg. Actually you can achieve much more with d3, you could visualize a data in any form and add interactivity. That’s why it has steep learning curve. For simple charts I would go with Ng2 Charts

Adding Ng2 Charts to your Ionic app

From it’s documentation,  It starts nicely with how to add it to your project. Followed how to use the Api. It comes with all the basic chart options is that Bar, Line, Pie. I also have a Doughnut Chart which I am going to use in our example.

Getting Started

npm install chart.js ng2-charts

// Add the following line to index.html
<script src="node_modules/chart.js/src/chart.js"></script>

// Add ChartsModule to your module
import { ChartsModule } from 'ng2-charts';

// In your App's module:
imports: [
   ChartsModule
]

We have done all the necessary work to properly install the chart. Next we need to use it. It’s dead simple to use it.

<canvas baseChart
    [data]="doughnutChartData" 
    [labels]="doughnutChartLabels" 
    [chartType]="doughnutChartType" 
    [options]="donutOptions"
  ></canvas>
doughnutChartLabels = ['Download Sales', 'In-Store Sales', 'Mail-Order Sales'];
doughnutChartData = [350, 450, 100];
doughnutChartType = 'doughnut';
donutOptions: any = {
    legend: {
      display: true,
      position: 'right'
    }
  };

The [chartType] property sets which kind of chart you want to use. Next proved some labels and chartdata in the form of arrays. You can choose from doughnut, line, bar and more. Then I have set some options to show labels on right. You can find all the options at chartjs documentation.

I have set some options to show labels on right. You can find all the options at chartjs documentation.

Preview

A preview of Pie chart after providing all the options to ng2-chart in ionic technbuzz.com

That’s how it looks and that’s how we add chart to your Ionic app.  I personally felt some challenges when trying to add dynamic data. I will write separate article on how I manage to provide dynamic data to my chart.

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