How to use ngx-charts in angular application ?

Charts helps us to visualize large amount of data in an easy to understand and interactive way.

This helps businesses to grow more by taking important decisions from the data.

For example, e-commerce can have charts or reports for product sales, with various categories like product type, year, etc.

In angular, we have various charting libraries to create charts. Ngx-charts is one of them.

Check out the list of best angular chart libraries.

In this article, we will see data visualization with ngx-charts and how to use ngx-charts in angular application ?

We will see,

How to install ngx-charts in angular ?
Create a vertical bar chart
Create a pie chart, advanced pie chart and pie chart grid

Introduction

ngx-charts is an open-source and declarative charting framework for angular2+. It is maintained by Swimlane.

It is using Angular to render and animate the SVG elements with all of its binding and speed goodness and uses d3 for the excellent math functions, scales, axis and shape generators, etc.

By having Angular do all of the renderings it opens us up to endless possibilities the Angular platform provides such as AoT, Universal, etc.

ngx-charts supports various chart types like bar charts, line charts, area charts, pie charts, bubble charts, doughnut charts, guage charts, heatmap, treemap and number cards.

It also supports features like autoscaling, timeline filtering, line interpolation, configurable axis, legends, real-time data support and so on.

Ngx-charts Installation

Create a new angular application using the following command
(Note: skip this step if you want to add ngx-charts in the existing angular application, At the time of writing this article I was using angular 9).
```
ng new ngx-charts-demo
```
Install ngx-charts package in an angular application using the following command.
```
npm install @swimlane/ngx-charts --save
```

At the time of installation if you get the following error

ERROR in The target entry-point "@swimlane/ngx-charts" has missing dependencies:
 - @angular/cdk/portal

we need to add @angular/cdk using the following

npm install @angular/cdk --save

Import NgxChartsModule from 'ngx-charts' in AppModule.
ngx-charts also required the BrowserAnimationsModule. Import it in AppModule.

So our final AppModule will look like :

import { BrowserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';
import { AppComponent } from './app.component';
import { NgxChartsModule }from '@swimlane/ngx-charts';
import { BrowserAnimationsModule } from '@angular/platform-browser/animations';

@NgModule({
  declarations: [
    AppComponent
  ],
  imports: [
    BrowserModule,
    BrowserAnimationsModule,
    NgxChartsModule
  ],
  providers: [],
  bootstrap: [AppComponent]
})
export class AppModule { }

Great, Installation steps are done. Now let’s develop various charts using ngx-charts components.

In AppComponent we will create the following sales data array. We will use this object to generate charts.

import { Component } from '@angular/core';

@Component({
  selector: 'app-root',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.css']
})
export class AppComponent {
  saleData = [
    { name: "Mobiles", value: 105000 },
    { name: "Laptop", value: 55000 },
    { name: "AC", value: 15000 },
    { name: "Headset", value: 150000 },
    { name: "Fridge", value: 20000 }
  ];
}

Vertical Bar Chart

ngx-charts provides various components to generate vertical bar chart, pie chart, advanced pie chart, pie chart grid and so on.

To generate a vertical bar chart, ngx-charts provide ngx-charts-bar-vertical component, add it on the template as below:

<ngx-charts-bar-vertical 
    [view]="[1000,400]"
    [results]="saleData"
    [xAxisLabel]="'Products'"
    [legendTitle]="'Product Sale Chart'"
    [yAxisLabel]="'Sale'"
    [legend]="true"
    [showXAxisLabel]="true"
    [showYAxisLabel]="true"
    [xAxis]="true"
    [yAxis]="true"
    [gradient]="true">
</ngx-charts-bar-vertical>

👉 Important properties of ngx-charts-bar-vertical component

results: To render salesData chart we need to assign this data object to results
view: set width and height of chart view
xAxisLabel
legendTitle
legend : if you want to show legend set it to true, default it is false.
showXAxisLabel : set true to show x-axis label.
showYAxisLabel: set true to show y-axis label.
xAxis / xAxis : set true to show specific axis.
gradient: set it to true to show bar with gradient background.

Pie Chart

We can generate pie chart using < ngx-charts-pie-chart > component. add it in template as below.

<ngx-charts-pie-chart 
    [results]="saleData"
    [legend]="true"
    [legendTitle]="'Product Sale Report'" 
    [view]="[1000,300]"
    [labels]="true" >
</ngx-charts-pie-chart>

Advanced Pie Chart

We can generate advanced pie chart using < ngx-charts-advanced-pie-chart > component as below.

<ngx-charts-advanced-pie-chart 
      [results]="saleData"
      [gradient]="true" >
</ngx-charts-advanced-pie-chart>

Pie Chart Grid

To generate pie chart grid we need to < ngx-charts-pie-grid > component on template as below.

<ngx-charts-pie-grid 
  [results]="saleData" >
</ngx-charts-pie-grid>

Great !!! we are done with ngx-charts implementation✨✨✨.

Final Code

import { BrowserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';
import { AppComponent } from './app.component';
import { NgxChartsModule }from '@swimlane/ngx-charts';
import { BrowserAnimationsModule } from '@angular/platform-browser/animations';

@NgModule({
  declarations: [
    AppComponent
  ],
  imports: [
    BrowserModule,
    BrowserAnimationsModule,
    NgxChartsModule
  ],
  providers: [],
  bootstrap: [AppComponent]
})
export class AppModule { }

import { Component } from '@angular/core';

@Component({
  selector: 'app-root',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.css']
})
export class AppComponent {
  saleData = [
    { name: "Mobiles", value: 105000 },
    { name: "Laptop", value: 55000 },
    { name: "AC", value: 15000 },
    { name: "Headset", value: 150000 },
    { name: "Fridge", value: 20000 }
  ];
}

<nav class="navbar navbar-expand navbar-light bg-primary">
  <div class="nav navbar-nav">
    <h5 class="nav-item nav-link active text-white">NGX-CHARTS DASHBOARD </h5>
  </div>
</nav>
<div class="container-fluid">
  <div class="row pt-2">
    <div class="col-md-12">
      <div class="card text-left">
        <div class="card-body">
          <h4 class="card-title border-bottom">Vertical Bar Charts</h4>
          <ngx-charts-bar-vertical 
              [view]="[1000,400]"
              [results]="saleData"
              [xAxisLabel]="'Products'"
              [legendTitle]="'Product Sale Chart'"
              [yAxisLabel]="'Sale'"
              [legend]="true"
              [showXAxisLabel]="true"
              [showYAxisLabel]="true"
              [xAxis]="true"
              [yAxis]="true"
              [gradient]="true">
          </ngx-charts-bar-vertical>
        </div>
      </div>
    </div>
    <div class="col-md-12">
      <div class="card text-left">
        <div class="card-body">
          <h4 class="card-title border-bottom">Advanced Pie Charts</h4>
          <ngx-charts-advanced-pie-chart 
                [results]="saleData"
                [gradient]="true" >
          </ngx-charts-advanced-pie-chart>
        </div>
      </div>
    </div>
    <div class="col-md-12">
      <div class="card text-left">
        <div class="card-body">
          <h4 class="card-title border-bottom">Pie Grid Charts</h4>
          <ngx-charts-pie-grid 
            [results]="saleData" >
          </ngx-charts-pie-grid>
        </div>
      </div>
    </div>
    <div class="col-md-12">
      <div class="card text-left">
        <div class="card-body">
          <h4 class="card-title border-bottom">Pie Charts</h4>
          <ngx-charts-pie-chart 
              [results]="saleData"
              [legend]="true"
              [legendTitle]="'Product Sale Report'" 
              [view]="[1000,300]"
              [labels]="true" >
          </ngx-charts-pie-chart>
        </div>
      </div>
    </div>
  </div>
</div>