Dotted line in Angular Chart component

27 Apr 20244 minutes to read

By using annotation, you can add dotted lines in the chart.

To add dotted lines in the chart, follow the given steps:

Step 1:

Initialize the custom elements by using the annotation property.

By setting coordinateUnits value as point in annotation object you can placed dotted lines
in the chart based on point x and y values.

app.component.ts

import { NgModule } from '@angular/core'
import { BrowserModule } from '@angular/platform-browser'
import { ChartModule, ChartAllModule, AccumulationChartAllModule } from '@syncfusion/ej2-angular-charts'
import { GridModule } from '@syncfusion/ej2-angular-grids'
import { PageService } from '@syncfusion/ej2-angular-grids'
import { AccumulationChartModule } from '@syncfusion/ej2-angular-charts'
import { DialogModule } from '@syncfusion/ej2-angular-popups'
import { PieSeriesService, AccumulationTooltipService, AccumulationDataLabelService } from '@syncfusion/ej2-angular-charts'
import {
    LineSeriesService, DateTimeService, DataLabelService, StackingColumnSeriesService, CategoryService,
    StepAreaSeriesService, SplineSeriesService, ScrollBarService, ChartAnnotationService, LegendService, TooltipService, StripLineService,
    SelectionService, ScatterSeriesService, ZoomService, ColumnSeriesService, AreaSeriesService, RangeAreaSeriesService
} from '@syncfusion/ej2-angular-charts'



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

@Component({
imports: [
         ChartModule, ChartAllModule, AccumulationChartAllModule, AccumulationChartModule, GridModule, DialogModule
    ],

providers: [LineSeriesService, DateTimeService, ColumnSeriesService, DataLabelService, ZoomService, StackingColumnSeriesService, CategoryService,
        StepAreaSeriesService, SplineSeriesService, ChartAnnotationService, LegendService, TooltipService, StripLineService,
        PieSeriesService, AccumulationTooltipService, ScrollBarService, AccumulationDataLabelService, SelectionService, ScatterSeriesService,
        PageService, AreaSeriesService, RangeAreaSeriesService ],
standalone: true,
    selector: 'app-container',
    template: `<ejs-chart id="chart-container" [primaryXAxis]='primaryXAxis' [title]='title'
     [tooltip]='tooltip'>
     <e-annotations>
    <e-annotation visible = true
                    content='<div id = "test" style="border-top:3px dashed grey;border-top-width: 2px; width: 10000px"></div>'
                    x = '2014' y = 50
                    coordinateUnits='Point'>
                </e-annotation>
            </e-annotations>
        <e-series-collection>
            <e-series [dataSource]='chartData' type='Line' xName='x' yName='y' name='Max Temp'></e-series>
        </e-series-collection>
    </ejs-chart>`
})
export class AppComponent implements OnInit {
    public primaryXAxis?: Object;
    public chartData?: Object[];
    public title?: string;
    public marker?: Object;
    public primaryYAxis?: Object;
    public tooltip: Object = {
        enable: true
    };
    ngOnInit(): void {
        this.chartData =[
        { x: '2014', y:34 }, { x: '2015', y: 38 },
        { x: '2016', y: 44 }, { x: '2017', y: 51 },
        { x: '2018', y: 61 }, { x: '2019', y: 76 },
        { x: '2020', y: 82 }
                ];
        this.primaryXAxis = {
        valueType: 'Category'
        };
        this.title =  'NC Weather Report - 2016';
    }
}

main.ts

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