Dynamic data update in Angular Chart component
13 Jun 202424 minutes to read
Adding a new data point
The addPoint method is used to dynamically add a new data point to the chart series. This method is particularly useful when you want to update the chart with a new data point without having to refresh the entire chart. This method takes two parameters:
- The first parameter is the new data point to add to your existing data source.
- The optional second parameter specifies the animation duration for adding the new data point.
import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { ChartModule } from '@syncfusion/ej2-angular-charts';
import { ChartComponent, SplineSeriesService, CategoryService, LegendService, DataLabelService } from '@syncfusion/ej2-angular-charts';
import { ButtonModule } from '@syncfusion/ej2-angular-buttons';
import { Component, OnInit, ViewChild } from '@angular/core';
@Component({
imports: [
ChartModule, ButtonModule
],
providers: [ SplineSeriesService, CategoryService, LegendService, DataLabelService ],
standalone: true,
selector: 'app-container',
template: `<ejs-chart #chart id="chart-container" [primaryXAxis]='primaryXAxis'[primaryYAxis]='primaryYAxis' [title]='title' [legendSettings]='legendSettings' [chartArea]='chartArea'>
<e-series-collection>
<e-series [dataSource]='chartData' type='Spline' xName='x' yName='y' name='Users' width=2 [marker]='marker'></e-series>
</e-series-collection>
</ejs-chart>
<button ej-button id='add' (click)='click()'>Add Point</button>`
})
export class AppComponent implements OnInit {
@ViewChild('chart')
public chart?: ChartComponent;
public primaryXAxis?: Object;
public primaryYAxis?: Object;
public chartData?: Object[] = [
{ x: "Germany", y: 72 },
{ x: "Russia", y: 103.1 },
{ x: "Brazil", y: 139.1 },
{ x: "India", y: 462.1 },
{ x: "China", y: 721.4 },
{ x: "USA", y: 286.9 },
{ x: "Great Britain", y: 115.1 },
{ x: "Nigeria", y: 97.2 }
];
public title?: string;
public marker?: Object;
public legendSettings?: Object;
public chartArea?: Object;
ngOnInit(): void {
this.primaryXAxis = {
valueType: 'Category',
enableTrim: false,
majorTickLines: { width: 0 },
majorGridLines: { width: 0 }
};
this.primaryYAxis = {
minimum: 0,
maximum: 800,
labelFormat: '{value}M',
edgeLabelPlacement: 'Shift'
};
this.title = 'Internet Users - 2016';
this.marker = {
visible: true,
dataLabel: {
visible: true,
position: 'Top',
font: { fontWeight: '600' }
}
};
this.legendSettings = { visible: false };
this.chartArea = {
border: { width: 1 }
};
}
click() {
this.chart?.series[0].addPoint({ x: 'Japan', y: 118.2 });
}
}import { bootstrapApplication } from '@angular/platform-browser';
import { AppComponent } from './app.component';
import 'zone.js';
bootstrapApplication(AppComponent).catch((err) => console.error(err));Removing an existing data point
The removePoint method is used to dynamically remove a data point from the chart series. This method is particularly useful when you want to update the chart by removing an existing data point without having to refresh the entire chart. This method takes two parameters:
- The first parameter is the index of the data point that needs to be removed from the existing data source.
- The optional second parameter specifies the animation duration for removing the data point.
import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { ChartModule } from '@syncfusion/ej2-angular-charts';
import { ChartComponent, SplineSeriesService, CategoryService, LegendService, DataLabelService } from '@syncfusion/ej2-angular-charts';
import { ButtonModule } from '@syncfusion/ej2-angular-buttons';
import { Component, OnInit, ViewChild } from '@angular/core';
@Component({
imports: [
ChartModule, ButtonModule
],
providers: [ SplineSeriesService, CategoryService, LegendService, DataLabelService ],
standalone: true,
selector: 'app-container',
template: `<ejs-chart #chart id="chart-container" [primaryXAxis]='primaryXAxis'[primaryYAxis]='primaryYAxis' [title]='title' [legendSettings]='legendSettings' [chartArea]='chartArea'>
<e-series-collection>
<e-series [dataSource]='chartData' type='Spline' xName='x' yName='y' name='Users' width=2 [marker]='marker'></e-series>
</e-series-collection>
</ejs-chart>
<button ej-button id='remove' (click)='click()'>Remove Point</button>`
})
export class AppComponent implements OnInit {
@ViewChild('chart')
public chart?: ChartComponent;
public primaryXAxis?: Object;
public primaryYAxis?: Object;
public chartData?: Object[] = [
{ x: "Germany", y: 72 },
{ x: "Russia", y: 103.1 },
{ x: "Brazil", y: 139.1 },
{ x: "India", y: 462.1 },
{ x: "China", y: 721.4 },
{ x: "USA", y: 286.9 },
{ x: "Great Britain", y: 115.1 },
{ x: "Nigeria", y: 97.2 }
];
public title?: string;
public marker?: Object;
public legendSettings?: Object;
public chartArea?: Object;
ngOnInit(): void {
this.primaryXAxis = {
valueType: 'Category',
enableTrim: false,
majorTickLines: { width: 0 },
majorGridLines: { width: 0 }
};
this.primaryYAxis = {
minimum: 0,
maximum: 800,
labelFormat: '{value}M',
edgeLabelPlacement: 'Shift'
};
this.title = 'Internet Users - 2016';
this.marker = {
visible: true,
dataLabel: {
visible: true,
position: 'Top',
font: { fontWeight: '600' }
}
};
this.legendSettings = { visible: false };
this.chartArea = {
border: { width: 1 }
};
}
click() {
this.chart?.series[0].removePoint(0);
}
}import { bootstrapApplication } from '@angular/platform-browser';
import { AppComponent } from './app.component';
import 'zone.js';
bootstrapApplication(AppComponent).catch((err) => console.error(err));Replacing entire data points
To replace the existing data source in the chart with a new data source, you can simply use the setData method. This method allows you to replace the existing data points in the chart series with a new set of data points, enabling you to easily update the chart with new information. This method takes two parameters:
- The first parameter is the new set of data points to be updated.
- The optional second parameter specifies the animation duration for updating the new data source.
import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { ChartModule } from '@syncfusion/ej2-angular-charts';
import { ChartComponent, ColumnSeriesService, CategoryService, IAxisRangeCalculatedEventArgs } from '@syncfusion/ej2-angular-charts';
import { ButtonModule } from '@syncfusion/ej2-angular-buttons';
import { Component, OnInit, ViewChild } from '@angular/core';
@Component({
imports: [
ChartModule, ButtonModule
],
providers: [ ColumnSeriesService, CategoryService ],
standalone: true,
selector: 'app-container',
template: `<ejs-chart #chart id="chart-container" [primaryXAxis]='primaryXAxis'[primaryYAxis]='primaryYAxis' [title]='title' [chartArea]='chartArea' (axisRangeCalculated)="axisRangeCalculated($event)">
<e-series-collection>
<e-series [dataSource]='chartData' type='Column' xName='x' yName='y' columnWidth=0.5 [cornerRadius]='cornerRadius'></e-series>
</e-series-collection>
</ejs-chart>
<button ej-button id='update' (click)='click()'>Update Data</button>`
})
export class AppComponent implements OnInit {
@ViewChild('chart')
public chart?: ChartComponent;
public primaryXAxis?: Object;
public primaryYAxis?: Object;
public chartData?: Object[] = [
{ x: 'Jewellery', y: 75 },
{ x: 'Shoes', y: 45 },
{ x: 'Footwear', y: 73 },
{ x: 'Pet Services', y: 53 },
{ x: 'Business Clothing', y: 85 },
{ x: 'Office Supplies', y: 68 },
{ x: 'Food', y: 45 }
];
public title?: string;
public cornerRadius?: Object;
public chartArea?: Object;
public getRandomInt(min: number, max: number) {
return Math.floor(Math.random() * (max - min + 1)) + min;
}
ngOnInit(): void {
this.primaryXAxis = {
valueType: 'Category',
majorGridLines: { width: 0 },
labelStyle: { size: '12px' },
labelIntersectAction: 'Rotate90'
};
this.primaryYAxis = {
title: 'Sales (in percentage)',
labelFormat: '{value}%',
lineStyle: { width: 0 },
majorTickLines: { width: 0 },
interval: 5,
minimum: 0,
maximum: 100
};
this.title = 'Sales by product';
this.cornerRadius = { topLeft: 15, topRight: 15 };
this.chartArea = {
border: { width: 0 }
};
}
click() {
const newData = (this.chart.series[0].dataSource as Object[]).map((item: { x: string, y: number }) => {
const value: number = this.getRandomInt(10, 90);
return { x: item.x, y: value };
});
if (this.chart.series.length > 0) {
this.chart.series[0].setData(newData, 500);
}
}
public axisRangeCalculated (args: IAxisRangeCalculatedEventArgs): void {
if (args.axis.name === 'primaryYAxis') {
args.maximum = args.maximum as number > 100 ? 100 : args.maximum;
if (args.maximum > 80) {
args.interval = 20;
} else if(args.maximum > 40){
args.interval = 10;
}
}
}
}import { bootstrapApplication } from '@angular/platform-browser';
import { AppComponent } from './app.component';
import 'zone.js';
bootstrapApplication(AppComponent).catch((err) => console.error(err));Click to add or remove a data point
You can use mouse or touch events to dynamically add or remove data points from an existing data source by clicking on the appropriate position within the chart area. To add a new data point to the existing data source, click anywhere in the chart area, retrieve the x-axis and y-axis information of the clicked location from the chartMouseClick event arguments. Then, utilize the addPoint method to add a new data point to the existing data source.
To remove a data point from the existing data source, simply click on the desired data point. To achieve this, first, verify whether the clicked data point obtained from chartMouseClick already exists in the data source. If it does, remove it by utilizing the removePoint method based on its index.
import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { ChartModule } from '@syncfusion/ej2-angular-charts';
import { ChartComponent, LineSeriesService, CategoryService, TooltipService, DataLabelService, IAxisRangeCalculatedEventArgs, Series, IMouseEventArgs } from '@syncfusion/ej2-angular-charts';
import { Component, OnInit, ViewChild } from '@angular/core';
@Component({
imports: [
ChartModule
],
providers: [ LineSeriesService, CategoryService, TooltipService, DataLabelService ],
standalone: true,
selector: 'app-container',
template: `<ejs-chart #chart id="chart-container" [primaryXAxis]='primaryXAxis'[primaryYAxis]='primaryYAxis' [title]='title' [chartArea]='chartArea' [tooltip]='tooltip' (chartMouseClick)='chartMouseClick($event)' (axisRangeCalculated)="axisRangeCalculated($event)">
<e-series-collection>
<e-series [dataSource]='chartData' type='Line' xName='x' yName='y' width=3 [marker]='marker'></e-series>
</e-series-collection>
</ejs-chart>
<button ej-button id='update' (click)='click()'>Update Data</button>`
})
export class AppComponent implements OnInit {
@ViewChild('chart')
public chart?: ChartComponent;
public primaryXAxis?: Object;
public primaryYAxis?: Object;
public chartData?: Object[] = [
{ x: 20, y: 20 },
{ x: 80, y: 80 }
];
public title?: string;
public marker?: Object;
public chartArea?: Object;
public tooltip?: Object;
ngOnInit(): void {
this.primaryXAxis = {
edgeLabelPlacement: 'Shift',
rangePadding: 'Additional',
majorGridLines: { width: 0 }
};
this.primaryYAxis = {
title: 'Value',
interval: 20,
lineStyle: { width: 0 },
majorTickLines: { width: 0 }
};
this.title = 'User supplied data';
this.marker = {
visible: true,
isFilled: true,
border: {
width: 2,
color: 'White'
},
width: 13,
height: 13
};
this.chartArea = {
border: { width: 0 }
};
this.tooltip = { enable: true };
}
public chartMouseClick(args: IMouseEventArgs): void {
let isRemoved: boolean = false;
if (args.axisData) {
for (let i: number = 0; i < (this.chart.series[0] as Series).points.length; i++) {
let markerWidth: number = (this.chart.series[0] as Series).marker.width / 2;
let roundedX: number = Math.round(args.axisData['primaryXAxis']) + markerWidth;
let roundedY: number = Math.round(args.axisData['primaryYAxis']) + markerWidth;
let pointX: number = Math.round((this.chart.series[0] as Series).points[i].x as number) + markerWidth;
let pointY: number = Math.round((this.chart.series[0] as Series).points[i].y as number) + markerWidth;
if ((roundedX === pointX || roundedX + 1 === pointX || roundedX - 1 === pointX) &&
(roundedY === pointY || roundedY + 1 === pointY || roundedY - 1 === pointY)) {
if ((this.chart.series[0] as Series).points.length > 1) {
const points = (this.chart.series[0] as Series).points;
const duration: number = i === 0 || i === points[points.length - 1].index ? 500 : 0;
this.chart.series[0].removePoint(i, duration);
}
isRemoved = true;
}
}
if (!isRemoved) {
this.chart.series[0].addPoint({ x: Math.round(args.axisData['primaryXAxis']), y: Math.round(args.axisData['primaryYAxis']) });
}
}
};
public axisRangeCalculated(args: IAxisRangeCalculatedEventArgs): void {
if (args.axis.name === 'primaryXAxis') {
if (args.interval < 10) {
args.maximum = args.maximum + 10;
args.minimum = args.minimum - 10;
args.interval = 10;
}
}
if (args.axis.name === 'primaryYAxis') {
if (args.maximum <= 60) {
args.interval = 10;
}
}
};
}import { bootstrapApplication } from '@angular/platform-browser';
import { AppComponent } from './app.component';
import 'zone.js';
bootstrapApplication(AppComponent).catch((err) => console.error(err));