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Working with Data

Chart can visualise data bound from local or remote data.

Local Data

You can bind a simple JSON data to the chart using dataSource property in series. Now map the fields in JSON to xName and yName properties.

Source
Preview
index.tsx
import * as React from "react";
import * as ReactDOM from "react-dom";
import { AxisModel,Category,ChartComponent, ColumnSeries, Inject, Legend, LineSeries,
SeriesCollectionDirective, SeriesDirective  } from '@syncfusion/ej2-react-charts';

class App extends React.Component<{}, {}> {

  public data: any[] = [
    { month: 'Jan', sales: 35 }, { month: 'Feb', sales: 28 },
    { month: 'Mar', sales: 34 }, { month: 'Apr', sales: 32 },
    { month: 'May', sales: 40 }, { month: 'Jun', sales: 32 },
    { month: 'Jul', sales: 35 }, { month: 'Aug', sales: 55 },
    { month: 'Sep', sales: 38 }, { month: 'Oct', sales: 30 },
    { month: 'Nov', sales: 25 }, { month: 'Dec', sales: 32 }
  ];
  public primaryxAxis: AxisModel = { valueType: 'Category' };

  render() {
    return <ChartComponent id='charts' primaryXAxis={this.primaryxAxis}>
      <Inject services={[ColumnSeries, Legend, LineSeries, Category]} />
      <SeriesCollectionDirective>
        <SeriesDirective dataSource={this.data} xName='month' type='Column' yName='sales' name='Sales' />
      </SeriesCollectionDirective>
    </ChartComponent>
  }

};
ReactDOM.render(<App />, document.getElementById("charts"));

Lazy loading

Lazy loading allows you to load data for chart on demand. Chart will fire the scrollEnd event, in that we can get the minimum and maximum range of the axis, based on this, we can upload the data to chart.

Source
Preview
index.tsx
import * as React from "react";
import * as ReactDOM from "react-dom";
import {  ChartComponent, SeriesCollectionDirective, SeriesDirective, Inject,
    ChartTheme, ScrollBar, Zoom, IScrollEventArgs, LineSeries, Tooltip,
    DateTime, ILoadedEventArgs, Chart, Crosshair, ColumnSeries  } from '@syncfusion/ej2-react-charts';

class App extends React.Component<{}, {}> {

 private chart: ChartComponent;
 private intl: Internationalization = new Internationalization();

     private GetDateTimeData(start: Date, end: Date): { x: Date, y: number }[] {
        let series1: { x: Date, y: number }[] = [];
        let date: number;
        let value: number = 30;
        let option: DateFormatOptions = {
            skeleton: 'full',
            type: 'dateTime'
        };
        let dateParser: Function = this.intl.getDateParser(option);
        let dateFormatter: Function = this.intl.getDateFormat(option);
        for (let i: number = 0; start <= end; i++) {
            date = Date.parse(dateParser(dateFormatter(start)));
            if (Math.random() > .5) {
                value += (Math.random() * 10 - 5);
            } else {
                value -= (Math.random() * 10 - 5);
            }
            if (value < 0) {
                value = this.getRandomInt(20, 40);
            }
            let point1: { x: Date, y: number } = { x: new Date(date), y: Math.round(value) };
            new Date(start.setDate(start.getDate() + 1));
            series1.push(point1);
        }
        return series1;
    }

   private getRandomInt(min: number, max: number): number {
        return Math.floor(Math.random() * (max - min + 1)) + min;
    }
  render() {
    return   <ChartComponent id='charts'
                           ref={chart => this.chart = chart}
                            primaryXAxis={{
                                title: 'Day',
                                valueType: 'DateTime',
                                edgeLabelPlacement: 'Shift',
                                skeleton: 'yMMM',
                                skeletonType: 'Date',
                                scrollbarSettings: {
                                    range: {
                                        minimum: new Date(2009, 0, 1),
                                        maximum: new Date(2014, 0, 1)
                                    },
                                    enable: true,
                                }
                            }}
                            primaryYAxis={{
                                title: 'Server Load',
                                labelFormat: '{value}MB'
                            }}
                            crosshair={{ enable: true, lineType: 'Vertical' }}
                            chartArea={{ border: { width: 0 } }}
                            tooltip={{ enable: true }}
                            legendSettings={{ visible: true }}
                           // scrollStart={this.scrollStart.bind(this)}
                            scrollEnd={this.scrollEnd.bind(this)}
                            title='Network Load' height='450' width='100%' >
                            <Inject services={[LineSeries, DateTime, Tooltip, ScrollBar, Zoom, Crosshair]} />
                            <SeriesCollectionDirective>
                                <SeriesDirective dataSource={this.GetDateTimeData(new Date(2009, 0, 1), new Date(2009, 8, 1))} xName='x' yName='y'
                                    type='Line' animation={{ enable: false }}>
                                </SeriesDirective>
                            </SeriesCollectionDirective>
                        </ChartComponent>
  }

};
ReactDOM.render(<App />, document.getElementById("charts"));

Common Datasource

You can also bind a JSON data common to all series using dataSource property in chart.

Source
Preview
index.tsx
import * as React from "react";
import * as ReactDOM from "react-dom";
import { AxisModel,Category,ChartComponent, ColumnSeries, Inject, Legend, LineSeries,
SeriesCollectionDirective, SeriesDirective  } from '@syncfusion/ej2-react-charts';

class App extends React.Component<{}, {}> {

  public chartData: any[] = [
      { month: 'Jan', sales: 35, sales1: 28 }, { month: 'Feb', sales: 28, sales1: 35 },
      { month: 'Mar', sales: 34, sales1: 32 }, { month: 'Apr', sales: 32, sales1: 34 },
      { month: 'May', sales: 40, sales1: 32 }, { month: 'Jun', sales: 32, sales1: 40 },
      { month: 'Jul', sales: 35, sales1: 55 }, { month: 'Aug', sales: 55, sales1: 35 },
      { month: 'Sep', sales: 38, sales1: 30 }, { month: 'Oct', sales: 30, sales1: 38 },
      { month: 'Nov', sales: 25, sales1: 32 }, { month: 'Dec', sales: 32, sales1: 25 }
  ];
  public primaryxAxis: AxisModel = { valueType: 'Category' };

  render() {
    return <ChartComponent id='charts' primaryXAxis={this.primaryxAxis} dataSource={this.chartData}>
      <Inject services={[ColumnSeries, Legend, LineSeries, Category]} />
      <SeriesCollectionDirective>
        <SeriesDirective  xName='month' type='Column' yName='sales'  />
        <SeriesDirective  xName='month' type='Column' yName='sales1' />
      </SeriesCollectionDirective>
    </ChartComponent>
  }

};
ReactDOM.render(<App />, document.getElementById("charts"));

Remote Data

You can also bind remote data to the chart using DataManager. The DataManager requires minimal information like webservice URL, adaptor and crossDomain to interact with service endpoint properly. Assign the instance of DataManager to the dataSource property in series and map the fields of data to xName and yName properties. You can also use the query property of the series to filter the data.

Source
Preview
index.tsx
import * as React from "react";
import * as ReactDOM from "react-dom";
import { DataManager,Query} from '@syncfusion/ej2-data'
import { AxisModel,Category,ChartComponent, ColumnSeries, Inject, Legend, LineSeries, SeriesCollectionDirective, SeriesDirective  } from '@syncfusion/ej2-react-charts';

class App extends React.Component<{}, {}> {

  public dataManager = new DataManager({
    url: 'http://mvc.syncfusion.com/Services/Northwnd.svc/Tasks/'
  });
  public query = new Query().take(5).where('Estimate', 'lessThan', 3, false);
  public primaryxAxis: AxisModel = { valueType: 'Category', title: 'Asignee' };
  public primaryyAxis: AxisModel = { title: 'Estimate', minimum: 0, maximum: 3, interval: 1 };

  render() {
    return <ChartComponent id='charts'
      primaryXAxis={this.primaryxAxis}
      primaryYAxis={this.primaryyAxis}>
      <Inject services={[ColumnSeries, Legend, Category, LineSeries]} />
      <SeriesCollectionDirective>
        <SeriesDirective dataSource={this.dataManager} xName='Assignee' type='Column' yName='Estimate' name='Sales' query={this.query} />
      </SeriesCollectionDirective>
    </ChartComponent>
  }

};
ReactDOM.render(<App />, document.getElementById("charts"));

Empty points

The Data points that uses the null or undefined as value are considered as empty points. Empty data points are ignored and not plotted in the Chart. When the data is provided by using the points property, By using emptyPointSettings property in series, you can customize the empty point. Default mode of the empty point is Gap.

Source
Preview
index.tsx
import * as React from "react";
import * as ReactDOM from "react-dom";
import { AxisModel,Category,ChartComponent, ColumnSeries, Inject, LineSeries,
SeriesCollectionDirective, SeriesDirective  } from '@syncfusion/ej2-react-charts';

class App extends React.Component<{}, {}> {

  public data: any[] = [
    { month: 'Jan', sales: 35 }, { month: 'Feb', sales: null },
    { month: 'Mar', sales: 34 }, { month: 'Apr', sales: 32 },
    { month: 'May', sales: 40 }, { month: 'Jun', sales: undefined },
    { month: 'Jul', sales: 35 }, { month: 'Aug', sales: 55 },
    { month: 'Sep', sales: 38 }, { month: 'Oct', sales: 30 },
    { month: 'Nov', sales: 25 }, { month: 'Dec', sales: 32 }
  ];
  public primaryxAxis: AxisModel = { valueType: 'Category' };

  render() {
    return <ChartComponent id='charts' primaryXAxis={this.primaryxAxis}>
      <Inject services={[ColumnSeries, LineSeries, ColumnSeries, Category]} />
      <SeriesCollectionDirective>
        <SeriesDirective dataSource={this.data} xName='month' type='Column' yName='sales' name='Sales' />
        <SeriesDirective dataSource={this.data} xName='month' type='Line' yName='sales' name='Sales' />
      </SeriesCollectionDirective>
    </ChartComponent>
  }

};
ReactDOM.render(<App />, document.getElementById("charts"));

Empty point color

Specific color for empty point can be set by fill property in emptyPointSettings.

Source
Preview
index.tsx
import * as React from "react";
import * as ReactDOM from "react-dom";
import { AxisModel,Category,ChartComponent, ColumnSeries, EmptyPointSettingsModel,
Inject, LineSeries, SeriesCollectionDirective, SeriesDirective  } from '@syncfusion/ej2-react-charts';

class App extends React.Component<{}, {}> {

  public data: any[] = [
    { month: 'Jan', sales: 35 }, { month: 'Feb', sales: null },
    { month: 'Mar', sales: 34 }, { month: 'Apr', sales: 32 },
    { month: 'May', sales: 40 }, { month: 'Jun', sales: undefined },
    { month: 'Jul', sales: 35 }, { month: 'Aug', sales: 55 },
    { month: 'Sep', sales: 38 }, { month: 'Oct', sales: 30 },
    { month: 'Nov', sales: 25 }, { month: 'Dec', sales: 32 }
  ];
  public primaryxAxis: AxisModel = { valueType: 'Category' };
  public emptyPointSettings1: EmptyPointSettingsModel = { mode: 'Average', fill: 'pink' };
  public emptyPointSettings2: EmptyPointSettingsModel = { mode: 'Zero', fill: 'green' };

  render() {
    return <ChartComponent id='charts' primaryXAxis={this.primaryxAxis}>
      <Inject services={[ColumnSeries, LineSeries, ColumnSeries, Category]} />
      <SeriesCollectionDirective>
        <SeriesDirective dataSource={this.data} xName='month' type='Column' yName='sales' name='Sales' emptyPointSettings={this.emptyPointSettings1} />
        <SeriesDirective dataSource={this.data} xName='month' type='Line' yName='sales' name='Sales' emptyPointSettings={this.emptyPointSettings2} />
      </SeriesCollectionDirective>
    </ChartComponent>
  }

};
ReactDOM.render(<App />, document.getElementById("charts"));
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