Category axis in Angular Chart component

27 Sep 202314 minutes to read

Category axis are used to represent, the string values instead of numbers.

To known about category axis, you can check on this video:

app.component.ts

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

@Component({
    selector: 'app-container',
    template: `<ejs-chart id="chart-container" [primaryXAxis]='primaryXAxis'[primaryYAxis]='primaryYAxis' [title]='title'>
        <e-series-collection>
            <e-series [dataSource]='chartData' type='Column' xName='country' yName='gold' name='Gold'></e-series>
        </e-series-collection>
    </ejs-chart>`
})
export class AppComponent implements OnInit {
    public primaryXAxis?: Object;
    public chartData?: Object[];
    public title?: string;
    public primaryYAxis?: Object;
    ngOnInit(): void {
        this.chartData = [
             { country: "USA", gold: 50 },
             { country: "China", gold: 40 },
             { country: "Japan", gold: 70 },
             { country: "Australia", gold: 60 },
             { country: "France", gold: 50 },
             { country: "Germany", gold: 40 },
             { country: "Italy", gold: 40 },
             { country: "Sweden", gold: 30, silver: 25 }
        ];
        this.primaryXAxis = {
            valueType: 'Category',
            title: 'Countries'
        };
        this.primaryYAxis = {
            minimum: 0, maximum: 80,
            interval: 20, title: 'Medals'
        };
        this.title = 'Olympic Medals';
    }

}

app.module.ts

import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { AppComponent } from './app.component';
import { ChartModule} from '@syncfusion/ej2-angular-charts';
import { CategoryService, BarSeriesService, ColumnSeriesService, LineSeriesService,LegendService, DataLabelService, MultiLevelLabelService, SelectionService} from '@syncfusion/ej2-angular-charts';

/**
 * Module
 */
@NgModule({
    imports: [
        BrowserModule, ChartModule
    ],
    declarations: [AppComponent],
    bootstrap: [AppComponent],
    providers: [ CategoryService, BarSeriesService, ColumnSeriesService, LineSeriesService,LegendService, DataLabelService, MultiLevelLabelService, SelectionService]
})
export class AppModule { }

main.ts

import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
import { enableProdMode } from '@angular/core';
import { AppModule } from './app.module';

import 'zone.js';
enableProdMode();
platformBrowserDynamic().bootstrapModule(AppModule);

Note: To use category axis, we need to inject CategoryService into the @NgModule.providers and set the valueType of axis to Category.

Labels Placement

By default, category labels are placed between the ticks in an axis, this can also be placed on ticks
using labelPlacement property.

app.component.ts

import { Component, OnInit } from '@angular/core';
import { categoryData } from './datasource';
@Component({
    selector: 'app-container',
    template: `<ejs-chart id="chart-container" [primaryXAxis]='primaryXAxis'[primaryYAxis]='primaryYAxis' [title]='title'>
        <e-series-collection>
            <e-series [dataSource]='chartData' type='Column' xName='country' yName='gold' name='Gold'></e-series>
        </e-series-collection>
    </ejs-chart>`
})
export class AppComponent implements OnInit {
    public primaryXAxis?: Object;
    public chartData?: Object[];
    public title?: string;
    primaryYAxis: any;
    ngOnInit(): void {
        this.chartData = categoryData;
        this.primaryXAxis = {
            valueType: 'Category',
            title: 'Countries',
            labelPlacement: 'OnTicks'
        };
        this.title = 'Olympic Medals';
    }

}

app.module.ts

import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { AppComponent } from './app.component';
import { ChartModule} from '@syncfusion/ej2-angular-charts';
import { CategoryService, BarSeriesService, ColumnSeriesService, LineSeriesService,LegendService, DataLabelService, MultiLevelLabelService, SelectionService} from '@syncfusion/ej2-angular-charts';

/**
 * Module
 */
@NgModule({
    imports: [
        BrowserModule, ChartModule
    ],
    declarations: [AppComponent],
    bootstrap: [AppComponent],
    providers: [ CategoryService, BarSeriesService, ColumnSeriesService, LineSeriesService,LegendService, DataLabelService, MultiLevelLabelService, SelectionService]
})
export class AppModule { }

main.ts

import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
import { enableProdMode } from '@angular/core';
import { AppModule } from './app.module';

import 'zone.js';
enableProdMode();
platformBrowserDynamic().bootstrapModule(AppModule);

Range

Range of the category axis can be customized using minimum, maximum and interval property of the axis.

app.component.ts

import { Component, OnInit } from '@angular/core';
import { categoryData } from './datasource';
@Component({
    selector: 'app-container',
    template: `<ejs-chart id="chart-container" [primaryXAxis]='primaryXAxis' [title]='title'>
        <e-series-collection>
            <e-series [dataSource]='chartData' type='Column' xName='country' yName='gold' name='Gold'></e-series>
        </e-series-collection>
    </ejs-chart>`
})
export class AppComponent implements OnInit {
    public primaryXAxis?: Object;
    public chartData?: Object[];
    public title?: string;
    public primaryYAxis?: Object;
    ngOnInit(): void {
        this.chartData = categoryData;
        this.primaryXAxis = {
            valueType: 'Category',
            minimum: 1,
            maximum: 5,
            interval: 2,
            title: 'Countries'
        };
        this.title = 'Olympic Medals';
    }

}

app.module.ts

import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { AppComponent } from './app.component';
import { ChartModule} from '@syncfusion/ej2-angular-charts';
import { CategoryService, BarSeriesService, ColumnSeriesService, LineSeriesService,LegendService, DataLabelService, MultiLevelLabelService, SelectionService} from '@syncfusion/ej2-angular-charts';

/**
 * Module
 */
@NgModule({
    imports: [
        BrowserModule, ChartModule
    ],
    declarations: [AppComponent],
    bootstrap: [AppComponent],
    providers: [ CategoryService, BarSeriesService, ColumnSeriesService, LineSeriesService,LegendService, DataLabelService, MultiLevelLabelService, SelectionService]
})
export class AppModule { }

main.ts

import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
import { enableProdMode } from '@angular/core';
import { AppModule } from './app.module';

import 'zone.js';
enableProdMode();
platformBrowserDynamic().bootstrapModule(AppModule);

Indexed category axis

Category axis also can be rendered based on the index values of data source. This can be achieved by defining the isIndexed property to true in the axis.

app.component.ts

import { Component, OnInit } from '@angular/core';
import { categoryData } from './datasource';
@Component({
    selector: 'app-container',
    template: `<ejs-chart id="chart-container" [primaryXAxis]='primaryXAxis'[primaryYAxis]='primaryYAxis' [title]='title'>
        <e-series-collection>
            <e-series [dataSource]='chartData1' type='Column' xName='x' yName='y'></e-series>
            <e-series [dataSource]='chartData2' type='Column' xName='x' yName='y'></e-series>
        </e-series-collection>
    </ejs-chart>`
})
export class AppComponent implements OnInit {
    public primaryXAxis?: Object;
    public chartData1?: Object[];
    public chartData2?: Object[];
    public title?: string;
    primaryYAxis: any;
    ngOnInit(): void {
        this.chartData1 =  [{ x: 'Myanmar', y: 7.3 }, { x: 'India', y: 7.9 }, { x: 'Bangladesh', y: 6.8 }, { x: 'Cambodia', y: 7.0 }, { x: 'China', y: 6.9 }];
        this.chartData2 = [{ x: 'Poland', y: 2.7 },{ x: 'Australia', y: 2.5 },{ x: 'Singapore', y: 2.0 },{ x: 'Canada', y: 1.4 },{ x: 'Germany', y: 1.8 }];
        this.primaryXAxis = {
            valueType: 'Category',
             isIndexed: true
        };
        this.title = 'Olympic Medals';
    }

}

app.module.ts

import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { AppComponent } from './app.component';
import { ChartModule} from '@syncfusion/ej2-angular-charts';
import { CategoryService, BarSeriesService, ColumnSeriesService, LineSeriesService,LegendService, DataLabelService, MultiLevelLabelService, SelectionService} from '@syncfusion/ej2-angular-charts';

/**
 * Module
 */
@NgModule({
    imports: [
        BrowserModule, ChartModule
    ],
    declarations: [AppComponent],
    bootstrap: [AppComponent],
    providers: [ CategoryService, BarSeriesService, ColumnSeriesService, LineSeriesService,LegendService, DataLabelService, MultiLevelLabelService, SelectionService]
})
export class AppModule { }

main.ts

import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
import { enableProdMode } from '@angular/core';
import { AppModule } from './app.module';

import 'zone.js';
enableProdMode();
platformBrowserDynamic().bootstrapModule(AppModule);