Display tooltip on svg and canvas elements in Angular Tooltip component

27 Sep 20236 minutes to read

Tooltip can be displayed on both SVG and Canvas elements. You can directly attach the <svg> or <canvas> elements to show tooltips on data visualization elements.

** SVG **

Create the SVG square element and refer to the following code snippet to render the tooltip on SVG square.

        <ejs-tooltip cssClass='e-tooltip-css' content='SVG Square' target='#square'>
            <svg>
                <rect id="square" class="shape" x="50" y="20" width="50" height="50" style="fill:#FDA600;stroke:none;stroke-width:5;stroke-opacity:0.9" />
            </svg>
        </ejs-tooltip>

** Canvas **

Create the canvas circle element and refer to the following code snippet to render the tooltip on Canvas circle.

        <ejs-tooltip cssClass='e-tooltip-css' content='Canvas Circle' target='#circle'>
            <canvas #circle id="circle" class="shape" width="60" height="60"></canvas>
        </ejs-tooltip>

app.component.ts
app.module.ts
main.ts
import { Component, ViewChild, ViewEncapsulation, ElementRef } from '@angular/core';
import { TooltipComponent } from '@syncfusion/ej2-angular-popups';

@Component({
    selector: 'my-app',
    template: `
      <div id="box">
        <div class="circletool" id="rectShape" style="left:1%;top:10%">
          <ejs-tooltip cssClass='e-tooltip-css' content='SVG Square' target='#square'>
              <svg>
                <rect id="square" class="shape" x="50" y="20" width="50" height="50" style="fill:#FDA600;stroke:none;stroke-width:5;stroke-opacity:0.9" />
              </svg>
          </ejs-tooltip>
        </div>

        <div class="circletool" id="ellipseShape" style="top:63%;">
          <ejs-tooltip cssClass='e-tooltip-css' content='SVG Ellipse' target='#ellipse'>
              <svg>
                <ellipse id="ellipse" class="shape" cx="100" cy="50" rx="20" ry="40" style="fill:#0450C2;stroke:none;stroke-width:2" />
              </svg>
          </ejs-tooltip>
        </div>

        <div class="circletool" id="polyShape" style="top:25%;left:40%">
          <ejs-tooltip cssClass='e-tooltip-css'  content='SVG Polyline' target='#polyline'>
              <svg>
                <polyline id="polyline" class="shape" points="0,40 40,40 40,80 80,80 80,120 120,120 120,160" style="fill:#ffffff;stroke:#0450C2;stroke-width:4" />
              </svg>
          </ejs-tooltip>
        </div>

        <div class="circletool" id="circleShape" style="top:16%;left:72%">
          <ejs-tooltip cssClass='e-tooltip-css' content='Canvas Circle' target='#circle'>
            <canvas #circle id="circle" class="shape" width="60" height="60"></canvas>
          </ejs-tooltip>
        </div>

        <div class="circletool" id="triShape" style="top:73%;left:76%">
          <ejs-tooltip cssClass='e-tooltip-css' content='Canvas Triangle' target='#triangle'>
            <canvas #triangle id="triangle" class="shape" width="100" height="50"></canvas>
          </ejs-tooltip>
        </div>
      </div>
    `,
    encapsulation: ViewEncapsulation.None,
})

export class AppComponent {
  public context?: any;
  public circlecontext?: any;
  @ViewChild('triangle')canvasRef: ElementRef | any;
  @ViewChild('circle')circleRef: ElementRef | any;
  ngOnInit(){
if (this.canvasRef.nativeElement.getContext) {
    this.context = this.canvasRef.nativeElement.getContext('2d');
    this.context.beginPath();
    this.context.moveTo(0, 50);
    this.context.lineTo(100, 50);
    this.context.lineTo(50, 0);
    this.context.fillStyle = "#FDA600";
    this.context.fill();
}
this.circlecontext = this.circleRef.nativeElement.getContext('2d');
let centerX: number = this.circleRef.nativeElement.width / 2;
let centerY: number = this.circleRef.nativeElement.height / 2;
let radius: number = 30;
this.circlecontext.beginPath();
this.circlecontext.arc(centerX, centerY, radius, 0, 2 * Math.PI, false);
this.circlecontext.fillStyle = '#0450C2';
this.circlecontext.fill();
}
}
import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { TooltipModule } from '@syncfusion/ej2-angular-popups';
import { AppComponent } from './app.component';

/**
 * Module
 */
@NgModule({
    imports: [
        BrowserModule,
        TooltipModule
    ],
    declarations: [AppComponent],
    bootstrap: [AppComponent]
})
export class AppModule { }
import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
import { enableProdMode } from '@angular/core';
import { AppModule } from './app.module';

import 'zone.js';
enableProdMode();
platformBrowserDynamic().bootstrapModule(AppModule);