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Category axis in Angular Chart component

8 Apr 202612 minutes to read

The category axis is used to represent string-based values instead of numeric values. It is commonly used for displaying discrete categories such as names, labels, or textual groupings along an axis.

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

import { ChartModule } from '@syncfusion/ej2-angular-charts'
import { CategoryService, BarSeriesService, ColumnSeriesService, LineSeriesService, LegendService, DataLabelService, MultiLevelLabelService, SelectionService } from '@syncfusion/ej2-angular-charts'
import { Component, OnInit } from '@angular/core';

@Component({
imports: [
         ChartModule
    ],

providers: [ CategoryService, BarSeriesService, ColumnSeriesService, LineSeriesService,LegendService, DataLabelService, MultiLevelLabelService, SelectionService],
standalone: true,
    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';
    }

}
import { bootstrapApplication } from '@angular/platform-browser';
import { AppComponent } from './app.component';
import 'zone.js';
bootstrapApplication(AppComponent).catch((err) => console.error(err));

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

Label Placement

By default, category labels are positioned between the axis tick marks. They can also be aligned directly on the ticks by using the labelPlacement property.

import { ChartModule } from '@syncfusion/ej2-angular-charts'
import { CategoryService, BarSeriesService, ColumnSeriesService, LineSeriesService, LegendService, DataLabelService, MultiLevelLabelService, SelectionService } from '@syncfusion/ej2-angular-charts'
import { Component, OnInit } from '@angular/core';
import { categoryData } from './datasource';
@Component({
imports: [
         ChartModule
    ],

providers: [ CategoryService, BarSeriesService, ColumnSeriesService, LineSeriesService,LegendService, DataLabelService, MultiLevelLabelService, SelectionService],
standalone: true,
    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';
    }

}
import { bootstrapApplication } from '@angular/platform-browser';
import { AppComponent } from './app.component';
import 'zone.js';
bootstrapApplication(AppComponent).catch((err) => console.error(err));

Range

The visible range of the category axis can be customized by using the minimum, maximum and interval properties of the axis. These properties control the start value, end value, and spacing between category labels.

import { ChartModule } from '@syncfusion/ej2-angular-charts'
import { CategoryService, BarSeriesService, ColumnSeriesService, LineSeriesService, LegendService, DataLabelService, MultiLevelLabelService, SelectionService } from '@syncfusion/ej2-angular-charts'
import { Component, OnInit } from '@angular/core';
import { categoryData } from './datasource';
@Component({
imports: [
         ChartModule
    ],

providers: [ CategoryService, BarSeriesService, ColumnSeriesService, LineSeriesService,LegendService, DataLabelService, MultiLevelLabelService, SelectionService],
standalone: true,
    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';
    }

}
import { bootstrapApplication } from '@angular/platform-browser';
import { AppComponent } from './app.component';
import 'zone.js';
bootstrapApplication(AppComponent).catch((err) => console.error(err));

Indexed category axis

The category axis can also be rendered based on the index values of the data source. This behavior can be enabled by setting the isIndexed property of the axis to true, which positions data points according to their index instead of their actual category values.

import { ChartModule } from '@syncfusion/ej2-angular-charts'
import { CategoryService, BarSeriesService, ColumnSeriesService, LineSeriesService, LegendService, DataLabelService, MultiLevelLabelService, SelectionService } from '@syncfusion/ej2-angular-charts'
import { Component, OnInit } from '@angular/core';
import { categoryData } from './datasource';
@Component({
imports: [
         ChartModule
    ],

providers: [ CategoryService, BarSeriesService, ColumnSeriesService, LineSeriesService,LegendService, DataLabelService, MultiLevelLabelService, SelectionService],
standalone: true,
    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';
    }

}
import { bootstrapApplication } from '@angular/platform-browser';
import { AppComponent } from './app.component';
import 'zone.js';
bootstrapApplication(AppComponent).catch((err) => console.error(err));