Angular

PostHog makes it easy to get data about traffic and usage of your Angular.js app. Integrating PostHog into your site enables analytics about user behavior, custom events capture, session recordings, feature flags, and more.

This guide walks you through integrating PostHog into your Angular app using the JavaScript Web SDK.

Installation

Install posthog-js using your package manager:

Terminal

yarn add posthog-js
# or
npm install --save posthog-js

In your src/main.ts, initialize PostHog using your project API key and instance address. You can find both in your project settings.

main.ts

import { bootstrapApplication } from '@angular/platform-browser';
import { appConfig } from './app/app.config';
import { AppComponent } from './app/app.component';
import posthog from 'posthog-js'

posthog.init(
  '<ph_project_api_key>',
  {
    api_host:https://us.i.posthog.com // usually https://us.i.posthog.com or https://eu.i.posthog.com
  }
)

bootstrapApplication(AppComponent, appConfig)
  .catch((err) => console.error(err));

Capture custom events

To capture custom events, import posthog and call posthog.capture(). Below is an example of how to do this in a component:

app.component.ts

import { Component } from '@angular/core';
import posthog from 'posthog-js'

@Component({
 // existing component code
})

export class AppComponent {
  handleClick() {
    posthog.capture(
      'home_button_clicked', 
    )
  }
}

Tracking pageviews

PostHog only captures pageview events when a page load is fired. Since Angular creates a single-page app, this only happens once, and the Angular router handles subsequent page changes.

If we want to capture every route change, we must write code to capture pageviews that integrates with the router.

To do this, import posthog into app-routing.module.ts, subscribe to router events and then capture $pageview events on NavigationEnd events:

JavaScript

// other imports...
import { RouterModule, Routes, Router, NavigationEnd } from '@angular/router';
import posthog from 'posthog-js';

//... routes, @NgModule

export class AppRoutingModule {
  constructor(private router: Router) {
    this.router.events.subscribe(event => {
      if (event instanceof NavigationEnd) {
        posthog.capture('$pageview');
      }
    });
  }
 }

Now, every time a user moves between pages, PostHog captures a $pageview event, not just on the first page load.

Next steps

For any technical questions for how to integrate specific PostHog features into Angular (such as feature flags, A/B testing, surveys, etc.), have a look at our JavaScript Web SDK docs.

Alternatively, the following tutorials can help you get started:

Installation

Capture custom events

Tracking pageviews

Next steps

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