Annotation in Angular Maps component

23 Sep 20235 minutes to read

Annotations are used to mark the specific area of interest in the Maps with texts, shapes, or images. Any number of annotations can be added to the Maps component.

Initialize the Maps component with annotation option, text content or ID of an HTML element or an HTML string can be specified to render a new element that needs to be displayed in the Maps by using the content property. To specify the content position with x and y properties as mentioned in the following example.

[app.module.ts]

import { NgModule }      from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { AppComponent }  from './app.component';
import { MapsModule } from '@syncfusion/ej2-angular-maps';
import { AnnotationsService } from '@syncfusion/ej2-angular-maps';


@NgModule({
  imports:      [ BrowserModule,MapsModule ],
  declarations: [ AppComponent ],
  bootstrap:    [ AppComponent ],
  providers: [AnnotationsService]
})
export class AppModule { }

[app.component.ts]

app.component.ts

import { Component, ViewEncapsulation } from '@angular/core';
import { africa_continent } from './africa-continent';

@Component({
    selector: 'app-container',
    // specifies the template string for the maps component
    template:`<div class="control-section">
    <div align='center'>
    <ejs-maps id='container' style="display:block;" [annotations] ='annotation'>
    <e-layers>
    <e-layer [shapeData]='shapeData' [shapeSettings]='shapeSettings'></e-layer>
    </e-layers>
    </ejs-maps>
    </div>
    </div>
    <svg height="150" width="400">
    <defs>
        <linearGradient id="grad1" x1="0%" y1="0%" x2="0%" y2="100%">
            <stop offset="0%" style="stop-color:#C5494B;stop-opacity:1"></stop>
            <stop offset="100%" style="stop-color:#4C134F;stop-opacity:1"></stop>
        </linearGradient>
    </defs>
   </svg>
   <div id="maps-annotation" style="display: none;">
        <div id="annotation">
            <div>
                <p style="margin-left:10px;font-size:13px;font-weight:500">Facts about Africa</p>
          </div>
          <hr style="margin-top:-3px;margin-bottom:10px;border:0.5px solid #DDDDDD">
          <div>
                <ul style="list-style-type:disc; margin-left:-20px;margin-bottom:2px; font-weight:400">
                    <li>Africa is the second largest and second most populated continent in the world.</li>
                   <li style="padding-top:5px;">Africa has 54 sovereign states and 10 non-sovereign territories.
                   </li>
                   <li style="padding-top:5px;">Algeria is the largest country in Africa, where as Mayotte is the smallest.</li>
                </ul>
          </div>
       </div>
    </div>
   <style>
        #annotation {
            color: #DDDDDD;
            font-size: 12px;
            font-family: Roboto;
            background: #3E464C;
            margin: 20px;
            padding: 10px;
            border-radius: 2px;
            width: 300px;
            box-shadow: 0px 2px 5px #666;
        }
    </style>`,
    encapsulation: ViewEncapsulation.None
  })

export class AppComponent {
    public shapeData = africa_continent;
    public shapeSettings = {
        fill: 'url(#grad1)'
    };
    public annotation:object[] = [
        {
            content:'#maps-annotation',
            x: '0%', y: '70%'
        }
    ];
}

app.module.ts

import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { AppComponent } from './app.component';
import { MapsModule } from '@syncfusion/ej2-angular-maps';
/**
 * Module
 */
@NgModule({
    imports: [
        BrowserModule, MapsModule
    ],
    declarations: [AppComponent],
    bootstrap: [AppComponent]
   
})
export class AppModule { }

main.ts

import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
import { enableProdMode } from '@angular/core';
import { AppModule } from './app.module';

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