Using WebComponents with Angular

Angular has good interoperability with WebComponents and, specifically, Custom Elements. There are a few steps that you need to do in order to integrate the GoodData dashboards or visualizations with the Angular app.

The guide below is based on the Angular template workspace generated using ng new my-app, but you should be able to adopt it to existing Angular projects easily.

Load WebComponents library

Add a new <script> tag to your main HTML file (src/index.html).

    <!doctype html>
    <html lang="en">
    <head>
      <meta charset="utf-8">
      <title>NgApp</title>
      <base href="/">
      <meta name="viewport" content="width=device-width, initial-scale=1">
      <link rel="icon" type="image/x-icon" href="favicon.ico">
+     <script type="module" async src="{your-gd-server-url}/components/{workspace-id}.js?auth=sso"></script>
    </head>
    <body>
      <app-root></app-root>
    </body>
    </html>

See WebComponents introduction page. Make sure to go through the Prerequisites and limitations section.

Add custom elements schema

Add CUSTOM_ELEMENTS_SCHEMA to your main module (src/app/app.module.ts). Otherwise, Angular will warn you about unknown components.

-   import { NgModule } from '@angular/core';
+   import { NgModule, CUSTOM_ELEMENTS_SCHEMA } from '@angular/core';
    import { BrowserModule } from '@angular/platform-browser';
    
    import { AppComponent } from './app.component';
    
    @NgModule({
      declarations: [
        AppComponent
      ],
      imports: [
        BrowserModule
      ],
      providers: [],
      bootstrap: [AppComponent],
+     schemas: [
+       CUSTOM_ELEMENTS_SCHEMA,
+     ]
    })
    export class AppModule { }

Embed visualizations

You can now use gd-insight and gd-dashboard elements anywhere in your src/app/app.component.html template.

<gd-insight insight="my-visualization-id" style="height:500px"></gd-insight>
<gd-dashboard dashboard="my-dashboard-id"></gd-dashboard>

You can copy the visualization id and dashboard id from the URL bar of your web browser, from the Analyze and Dashboards pages respectively. At this point you should see an visualization and a dashboard rendering on the screen.

We set the height of the gd-insight to a static value as it’s expecting a flex layout and would collapse to a 0 height otherwise.

Define dashboardId and visualizationId dynamically

You can use attribute binding to define the IDs dynamically from the Angular component code.

Define component variables in src/app/app.component.ts:

    import { Component } from "@angular/core";
    
    @Component({
      selector: 'app-root',
      templateUrl: './app.component.html',
      styleUrls: ['./app.component.css']
    })
    export class AppComponent {
      title = 'ng-app';
+     dashboardId = 'my-dashboard-id';
+     visualizationId = 'my-visualization-id';
    }

Update the src/app/app.component.html template:

<gd-insight [attr.insight]="visualizationId" style="height:500px"></gd-insight>
<gd-dashboard [attr.dashboard]="dashboardId"></gd-dashboard>

Add event listeners

Both gd-insight and gd-dashboard are dispatching custom events.

Visualization event listener

In case of gd-insight you can use the Angular event binding syntax. Define an event listener function in your component code (src/app/app.component.ts):

    import { Component } from "@angular/core";

    @Component({
      selector: 'app-root',
      templateUrl: './app.component.html',
      styleUrls: ['./app.component.css']
    })
    export class AppComponent {
      title = 'ng-app';
      dashboardId = 'my-dashboard-id';
      visualizationId = 'my-visualization-id';
+
+     onInsightLoaded(e: Event) {
+       console.log((e as CustomEvent).detail);
+     }
    }

Attach the event listener to the visualization at src/app/app.component.html:

<gd-insight [attr.insight]="visualizationId" style="height:500px" (insightLoaded)="onInsightLoaded($event)"></gd-insight>

Read more about visualization events.

Dashboard event listener

The setup for gd-dashboard is more complicated, as event names do not follow Angular naming convention. You would need to obtain a reference to the DOM object and add event listeners directly.

First, use the template reference variable to mark the dashboard element in src/app/app.component.html:

<gd-dashboard [attr.dashboard]="dashboardId" #dashboard></gd-dashboard>

Now you can obtain the element and attach event listeners in src/app/app.component.ts. Keep in mind that you also need to remove the listeners on the component unmount.

-   import { Component } from "@angular/core";
+   import { Component, ViewChild } from "@angular/core";
+
+   const EVENT_NAME = 'GDC.DASH/EVT.INITIALIZED';
+
    @Component({
      selector: 'app-root',
      templateUrl: './app.component.html',
      styleUrls: ['./app.component.css']
    })
    export class AppComponent {
      title = 'ng-app';
      dashboardId = 'my-dashboard-id';
      visualizationId = 'my-visualization-id';
+     private myDashboardElement?: HTMLElement;
    
      onInsightLoaded(e: Event) {
        console.log((e as CustomEvent).detail);
      }
+
+     onDashboardLoaded(e: Event) {
+       console.log((e as CustomEvent).detail);
+     }
+
+     @ViewChild("dashboard")
+     set dashboard(d: any) {
+       this.myDashboardElement = d.nativeElement;
+       this.myDashboardElement?.addEventListener(EVENT_NAME, this.onDashboardLoaded);
+     }
+
+     ngOnDestroy() {
+       this.myDashboardElement?.removeEventListener(EVENT_NAME, this.onDashboardLoaded);
+     }
    }

Read more about Dashboard events.

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