Categories
Online Marketing

Discoverability & Analytics

Your PWA is still a webpage that customers can find in their usual ways. You want to apply reasonable search engine optimization and ensure the page is available to search engines. You can use JavaScript on your pages and Google will index it as long as you follow some best practices. You can use the fetch as Google tool from the Google webmasters site to see how your app looks when crawled discoverability helps get customers to your site.

But how can you measure their behaviors once they get there? That’s where analytics comes in Google Analytics is a service that collects processes and reports, data about an applications, use patterns and performance. Adding Google Analytics to a web application enables the collection of data like visitor traffic, user agent, the user’s location, etc. This data is sent to Google Analytics servers where it’s processed.

The reports are available in the Google Analytics web interface and through a reporting API, Google Analytics is free and highly customisable. Integrating Google Analytics is simple. First, you must create a Google Analytics account. Each account has properties, and these aren’t JavaScript properties, but refer to individual applications or websites. Google Analytics then generates a tracking snippet for each property.

This is a piece of JavaScript that you pasted into your page. It sends data to the Google Analytics back-end. You can also use the analytics library to create custom analytics, such as tracking specific user actions or tracking push notifications. I want to say a bit more about properties. An account has properties that represent individual collections of data. These properties have property, IDs, also called tracking IDs.

That identify them to Google Analytics if an account represents a company. One property in that account might represent the company’s website, while another property might represent the company’s mobile application. If you only have one app, the simplest scenario is to create a single Google Analytics, account and add a single property to that account. This is the key part of the tracking snippet.

The entire snippet needs to be pasted into every page. You want to track at a high level when this script runs. It creates an async script tag that downloads analytics AS the analytics library it defines the GA function called the command queue. It creates a tracker that gathers user data and it sends this data as a pageview hit via HTTP request to Google Analytics. This data is analyzed in stored in your analytics account.

In addition to the data gathered by tracker creation, the page view event allows Google Analytics to infer what pages the user is visiting, how long they are visiting them and in what order for simpler applications. This is the only coding required note. You can replace analytics GS with analytics underscore debug KS for console debugging. Using this version will log detailed messages to the console for each hit, sent it also logs warnings and errors for your tracking code.

The data is sent to Google Analytics backend where it is processed into reports. These reports are available through the Google Analytics dashboard. Here is the audience overview interface. Here you can see general information such as page view, records bounce rate, ratio of new and returning visitors and other statistics. You can also see specific information like a visitor’s language, country, city, browser operating system, service provider, screen resolution and device.

Here we are looking at the user City, it’s also possible to view the analytics information in real time. This interface allows you to see hits as they occur on your site. I encourage you to take some time and explore there’s an extensive set of features in the dashboard. You should explore the standard reports and look at creating your own. Knowing how to use analytics for improving your business or increasing revenue is a skill within itself.

Fortunately, the Google Analytics Academy offers a free set of online courses. Google Analytics supports custom events that allow fine, grained analysis of user behavior. This code uses the G a command Q, which is defined in the tracking snippet. The send command is used to send an analytics event. Values associated with the event are as parameters. These values represent the event, category event, action and event label.

All of these are arbitrary and used to organize events. These custom events allow us to deeply understand user interactions with our site. For example, here we are sending a view more event. This might be used to indicate that the user has viewed an item from our site. The event label tells us that it was a premium product. I mentioned earlier that you might use events to track push notifications.

You can add events to fire when users subscribe or unsubscribe to push notifications as well as when there is an error in a subscription process. This can give you an understanding of how many users are subscribing or unsubscribing to your app here. We send a subscribe event, letting us know that a user has subscribed to our notifications. Let’s talk about what happens when analytics meets service workers, they won’t work without a little help.

That’s because the service worker script runs on its own thread and doesn’t have access to the GA command queue object established by the tracking snippet code on the main thread. It also requires the window object. Service workers must use the measurement protocol API instead of the command Q. This is a simple set of HTTP parameters documented at the Google Analytics site. Here’s an example of recording when the user closes a push notification.

The service worker manages the notification lifecycle, so it receives a notification close event when the event fires, the service worker, sends a hit via post with tracking ID custom event parameters and the required parameters for the API. Remember that we don’t want this service worker to shut down before we complete the post, so we wrap this code in event. Wait until since hits are effectively HTTP requests, they can’t be sent if the user is offline using service worker and indexeddb hits can be stored when users are offline and sent it a later time when they have reconnected.

Fortunately, the SW offline, google analytics and PM package abstracts this process for us to integrate offline analytics, install the package in your project with the npm install command. Then, in the service worker script import, the offline, google analytics import, je and initialize. The google and google analytics object. This adds a fetch event handler to the serviceworker that only listens for requests made to the Google Analytics domain.

The handler attempts to send Google Analytics normally if the network request fails, it will be stored in indexdb. Instead, the stored hits will be resent when online. You can test this behavior by enabling offline mode in developer tools and then triggering Google Analytics hits on your app indexdb will show a list of urls that represent the unsent hit requests. You may need to click the Refresh icon inside the indexdb interface to see them.

If you disable offline mode and refresh the page, you should see that the urls are cleared indicating that they have been sent now. It’s your turn. Go to the analytics API lab in there. You will create an account, add analytics to an app look at the results and make this work in a progressive web, app good luck and have fun if you’re an instructor. This final slide links to more information on analytics.

If you’re a student, these links can be found in your textbook. You may want to use these while you are working on the lab. There are additional slides at the end of this presentation that show the major analytic screens and explain how to get there, use these to deepen your knowledge or create live demonstrations. You


 

Categories
Online Marketing

Introduction to Service Workers

You’Ll learn what a service worker is and what it can do for your apps. A service worker is a client-side programmable proxy between your web app and the outside world. It gives you fine control over network requests. For example, you can control the caching behavior of requests for your site HTML and treat them differently than requests for your site’s images.

Service workers also enable you to handle push messaging now. Service workers are a type of web worker, an object that execute the script separately from the main browser thread. Service workers run independent of the application they are associated with and can receive messages when not active either, because your application is in the background or not open or the browser is closed. The primary uses for a service workers are to act as a caching agent to handle network requests and to store content for offline use and, secondly, to handle push messaging.

The service worker becomes idle when not in use and restarts when it’s next needed. Now, if there is information that you need to persist and reuse a course restarts, then service workers can work with indexdb databases. Service workers are promised based now we cover this more in other materials, but at a high level a promise is an object. These are the kind of placeholder for the eventual results of a deferred and possibly asynchronous computation service workers also depend on to api’s to work effectively fetch a standard way to retrieve content from the network and cache a persistent content storage for application data.

This cache is persistent and independent from the browser, cache or network status now because of the power of a service worker and to prevent man-in-the-middle attacks where third parties track the content of your users. Communication with the server service workers are only available on secure origins served through TLS using the HTTP protocol will test service workers using local host, which is exempt from this policy.

By the way, if you’re hosting code on github, you can use github pages to serve content. Their provision with SSL by default services, like let’s encrypt, allow you to procure SSL certificates for free to install on your server Service Worker, enabled applications to control network requests, cache those requests to improve performance and to provide offline access to cached content. But this is just the tip of the iceberg.

We will explore some things you can do with service workers and related api’s caching. Assets for your application will make the content load faster under a variety of Network conditions. Two specific types of caching behavior suitable for use are available through service workers. The first type of caching is the precache assets during installation. If you have assets, HTML, CSS, JavaScript images so on, and these are shared across your application.

You can cache them when you first install the serviceworker when your web app is first opened. This technique is at the core of application. Shell architecture now note that using this technique does not preclude regular dynamic caching, you can combine the pre cache with dynamic caching. The second type of caching is to provide a fallback for offline access using the fetch API inside a serviceworker.

We can fetch request and then modify the response with content other than the object requested use this technique to provide alternative resources in case the requested resources are not available in cache, and the network is unreachable. Service workers can also act as a base for advanced features. Service workers are designed to work as the starting point for features that make web applications work like native apps, and some of these features are blog messaging API, which allows web workers and service workers to communicate with each other and with the host application examples of this Api include new content notifications and updates that require user interaction.

The notifications API is a way to integrate push notifications from your application to the operating system native notification system. The push API enables push services to send push messages to an application service can send messages at any time, even when the application or the browser is not running. Push messages are delivered to a service worker which can use the information in the message to update local state or display a notification to the user background.

Sync lets you defer actions until the user has stable connectivity, and this is really useful for ensuring that whatever the user wants to send is actually sent. This API also allows servers to push periodic updates to the app, so the app can update when its next on line. Every service worker goes through three steps in its lifecycle, registration, installation and activation to install the service worker.

You need to register it in your main JavaScript code. Registration tells the browser where your service worker is where it’s located and to start installing it. In the background, for example, you could include a script tag in your site’s index.Html file or whatever file you use. Is your applications entry point with code similar to the ones shown here? This code starts by checking for browser support by attempting to find Service Worker as a property in the navigator object.

The service worker is then registered with navigator dot Service Worker dot register, which returns a promise that resolves when the service worker has been successfully registered. The scope of the service worker is then logged with registration, dot scope. You can attempt to register a service worker every time, the page loads and the browser will only complete the registration. If the service worker is new or has been updated, the scope of the Service Worker determines from which path the service worker will intercept requests.

The default scope is the path to the Service Worker file and extends to all directories below it. So if the Service Worker script, for example, Service Worker dot gif, is located in the root directory, the Service Worker will control requests from all files at best domain. You can also set an arbitrary scope by passing in an additional parameter when registering in this example. We’Re setting the scope of the Service Worker to slash app, which means the service worker will control requests from pages like slap slap, slash, lower and slash out, slash, lower slash low directories like that, but not from pages like slash, app or slash, which are higher a Service worker cannot have a scope above its own path.

This is in your service worker file, service worker, dot, j s now thinking about installation. Once the browser registers a service worker, the install event can occur. This event will trigger if the browser considers the service worker to be new either, because this is the first service worker encountered for this page or because there is a bite difference between the current service worker and the previously installed one.

We can add an install event handler to perform actions during the install event. The install event is a good time to do stuff, like caching, the apps your static assets using the cache API. If this is the first encounter with the service worker, for this page, the service worker will install and if successful, transition to the activation stage upon success once activated, the service worker will control all pages that load within its scope and intercept corresponding network requests.

However, the pages in your app that are open will not be under the serviceworkers scope, since the serviceworker was not loaded when the page is opened to put currently open pages under serviceworker control, you must reload the page or pages. Until then, requests from this page will bypass the serviceworker and operate just like they normally would service workers maintain control as long as there are pages open that are dependent on that specific version.

This ensures that only one version of the serviceworker is running at any given time. If a new serviceworker is installed on a page with an existing serviceworker, the new serviceworker will not take over until the existing serviceworker is removed. Old service workers will become redundant and be deleted once all pages. Using it are closed. This will activate the new serviceworker and allow it to take over refreshing.

The page is not sufficient to transfer control to a new serviceworker, because there won’t be a time when the old serviceworker is not in use. The activation event is a good time to clean up stale data from existing caches. The application note that activation of a new serviceworker can be forced programmatically, with self dot skips waiting service workers are event-driven installation and activation events, fire off corresponding events to which the serviceworker can respond.

The install event is when you should prepare your serviceworker for use. For example, by creating a cache and adding assets to it, the activate event is a good time to clean up old caches and anything else associated with a previous version of your serviceworker. The serviceworker can receive information from other scripts through message. Events. There are also functional events, such as fetch push and think that the serviceworker can respond to to examine service workers navigate to the serviceworker section in your browsers, developer tools, different browsers, put the tools in different places, check debugging service workers in browsers for instructions for Chrome, Firefox and opera, a fetch event is fired every time a resource is requested.

In this example, we listen to the fetch event and instead of going to the network, returned the requested resource from the cache assuming it is. Their service workers can use background sync here. We start by registering the service worker and once the service worker is ready, we register a sync event with the tag foo. The service worker can listen to sync events. This example listens for the sync event, tagged foo in the previous slide.

Do something should return a promise indicating the success or failure of whatever it’s trying to do if it fulfills the sync is complete. If it fails, another sync will be scheduled to retry retry syncs also wait for connectivity and employ an exponential back-off. The service worker can listen for push events, push events are initiated by your back-end servers through a browsers push service. This example shows a notification when the push event is received.

The options object is used to customize the notification. The notification could contain the data that was pushed from the service service workers can be tested and debug in the supporting browsers, developer tools. Screenshot here shows the chrome dev tools application panel. There are lots of great resources to help you get started and find out more access them from the materials that accompany this article.

In the lab materials that accompany this article, you can practice working with service workers and learn more about intercepting Network requests.


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