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Hide the tooltip for unselected series

By using the tooltipRender event, you can cancel the tooltip for unselected series in the chart.

To hide the tooltip value in unselected series, follow the given steps:

Step 1:

By using the tooltipRender event, you can get the series elements in the arguments. By using this argument we can compare whether seriesElementclasslist is deselected container or not. If it is true then we cancel the tooltip by setting the value for args.cancel as true.

Source
Preview
app.component.ts
app.module.ts
main.ts
import { Component, OnInit } from '@angular/core';
import { ITooltipRenderEventArgs, Series } from '@syncfusion/ej2-angular-charts';

@Component({
    selector: 'app-container',
    template:
    `<ejs-chart id="chart-container" [primaryXAxis]='primaryXAxis' [primaryYAxis]='primaryYAxis' [title]='title'
     [tooltip]='tooltip' selectionMode='Series'  (tooltipRender)='tooltipRender($event)'>
        <e-series-collection>
            <e-series [dataSource]='chartData' type='Line' xName='x' yName='y' name='Max Temp' width=2 [marker]='marker'></e-series>
               <e-series [dataSource]='chartData1' type='Line' xName='x' yName='y' name='Max Temp' width=2 [marker]='marker'></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 chartData1: Object[] = [
        { x: new Date(2005, 0, 1), y: 28 }, { x: new Date(2006, 0, 1), y: 44 },
        { x: new Date(2007, 0, 1), y: 48 }, { x: new Date(2008, 0, 1), y: 50 },
        { x: new Date(2009, 0, 1), y: 66 }, { x: new Date(2010, 0, 1), y: 78 },
        { x: new Date(2011, 0, 1), y: 84 }
    ];
    public tooltip: Object = {
        enable: true
    };
    public tooltipRender(args: ITooltipRenderEventArgs): void {
       let series: Series = <Series>(args.series);
       if (series.seriesElement.classList[0] === 'chart-container_ej2_deselected') {
          args.cancel = true;
       }
    };
    ngOnInit(): void {
        this.chartData =[
        { x: new Date(2005, 0, 1), y: 21 }, { x: new Date(2006, 0, 1), y: 24 },
        { x: new Date(2007, 0, 1), y: 36 }, { x: new Date(2008, 0, 1), y: 38 },
        { x: new Date(2009, 0, 1), y: 54 }, { x: new Date(2010, 0, 1), y: 57 },
        { x: new Date(2011, 0, 1), y: 70 }
                ];
        this.primaryXAxis = {
        valueType: 'DateTime',
        labelFormat: 'y',
        intervalType: 'Years',
        edgeLabelPlacement: 'Shift',
        majorGridLines: { width: 0 }
        };
        this.primaryYAxis = {
        labelFormat: '{value}%',
        rangePadding: 'None',
        minimum: 0,
        maximum: 100,
        interval: 20,
        lineStyle: { width: 0 },
        majorTickLines: { width: 0 },
        minorTickLines: { width: 0 }
        };
        this.marker = {  visible: true,
        height: 10,
        width: 10 };
        this.title =  'NC Weather Report - 2016';
    }
}
import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { AppComponent } from './app.component';
import { ChartModule } from '@syncfusion/ej2-angular-charts';
import { GridModule } from '@syncfusion/ej2-angular-grids';
import { PageService, SortService, FilterService, GroupService } from '@syncfusion/ej2-angular-grids';
import { AccumulationChartModule } from '@syncfusion/ej2-angular-charts';
import { PieSeriesService, AccumulationTooltipService, AccumulationDataLabelService } from '@syncfusion/ej2-angular-charts';
import { LineSeriesService, DateTimeService, DataLabelService,StackingColumnSeriesService,CategoryService, ChartShape,
       StepAreaSeriesService,SplineSeriesService,ScrollBarService, ChartAnnotationService, LegendService, TooltipService, StripLineService,
       SelectionService,ScatterSeriesService,ZoomService
    } from '@syncfusion/ej2-angular-charts';

/**
 * Module
 */
@NgModule({
    imports: [
        BrowserModule, ChartModule, AccumulationChartModule, GridModule
    ],
    declarations: [AppComponent],
    bootstrap: [AppComponent],
    providers: [ LineSeriesService, DateTimeService, DataLabelService, ZoomService, StackingColumnSeriesService,CategoryService,
               StepAreaSeriesService, SplineSeriesService, ChartAnnotationService, LegendService, TooltipService, StripLineService,
               PieSeriesService, AccumulationTooltipService,ScrollBarService, AccumulationDataLabelService, SelectionService,ScatterSeriesService
               ,PageService]
})
export class AppModule { }
import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
import { enableProdMode } from '@angular/core';
import { AppModule } from './app.module';

enableProdMode();
platformBrowserDynamic().bootstrapModule(AppModule);