Custom tool tip for columns in Angular Treegrid component

27 Apr 20243 minutes to read

You can achieve the custom tooltip(EJ2 Tooltip) for Tree Grid by using the queryCellInfo event.

Render the ToolTip component for the Tree Grid cells by using the following code in the
queryCellInfo event.

  public tooltip(args: QueryCellInfoEventArgs){
    const tooltip: Tooltip = new Tooltip({
      content: args.data[args.column.field].toString()
    });
    tooltip.appendTo(args.cell as HTMLElement);
  }

app.component.ts

import { NgModule,ViewChild } from '@angular/core'
import { BrowserModule } from '@angular/platform-browser'
import { TreeGridModule } from '@syncfusion/ej2-angular-treegrid'
import { PageService, SortService, FilterService } from '@syncfusion/ej2-angular-treegrid'
import {ButtonModule} from '@syncfusion/ej2-angular-buttons'
import { DropDownListAllModule } from '@syncfusion/ej2-angular-dropdowns'



import { Component, OnInit, ViewChild } from '@angular/core';
import { projectData } from './datasource';
import { TreeGridComponent } from '@syncfusion/ej2-angular-treegrid';
import { QueryCellInfoEventArgs } from '@syncfusion/ej2-angular-grids';
import { Tooltip } from '@syncfusion/ej2-popups';

@Component({
imports: [
        
        TreeGridModule,
        ButtonModule,
        DropDownListAllModule
    ],

providers: [PageService,
                SortService,
                FilterService],
standalone: true,
    selector: 'app-container',
    template: `<ejs-treegrid #treegridObj [dataSource]='data' idMapping='TaskID' parentIdMapping='parentID' [treeColumnIndex]='1' [height]='317' (queryCellInfo)='tooltip($event)' >
        <e-columns>
            <e-column field='TaskID' headerText='Task ID' width='70' textAlign='Right'></e-column>
            <e-column field='TaskName' headerText='Task Name' width='100' ></e-column>
            <e-column field='StartDate' headerText='Start Date' width='90' format="yMd" textAlign='Right'></e-column>
            <e-column field='EndDate' headerText='End Date' width='90' format="yMd" textAlign='Right'></e-column>
            <e-column field='Duration' headerText='Duration' width='80' textAlign='Right'></e-column>
            <e-column field='Priority' headerText='Priority' width='90'></e-column>
        </e-columns>
    </ejs-treegrid>`,
})
export class AppComponent implements OnInit {

    public data: Object[] = [];
    @ViewChild('treegridObj')
    public treegridObj?: TreeGridComponent;

    ngOnInit(): void {
        this.data = projectData;
    }
    tooltip(args: QueryCellInfoEventArgs | any) {
        const tooltip: Tooltip = new Tooltip({
            content: args.data[args.column.field].toString()
        }, args.cell as HTMLTableCellElement);  
    }

}

main.ts

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

You can refer to our Angular Tree Grid feature tour page for its groundbreaking feature representations. You can also explore our Angular Tree Grid example to knows how to present and manipulate data.