First lab 1 how is it

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First lab 1 how is it

In the ensuing window, click on the Web Server icon: You'll see this dialog next, which allows you to configure your local web server: Click the choose folder button, and select the work folder.

Under Options, check the box next to "Automatically show index. Then stop and restart the server by sliding the toggle labeled "Web Server: Now visit your work site in your web browser by clicking on the highlighted Web Server URL and you should see a page that looks like this: This app is not yet doing anything interesting - so far, it's just a minimal skeleton with a spinner we're using to verify your web server functionality.

We'll add functionality and UI features in subsequent steps. Architect your App Shell What is the app shell?

First lab 1 how is it

The app's shell is the minimal HTML, CSS, and JavaScript that is required to power the user interface of a progressive web app and is one of the components that ensures reliably good performance. Its first load should be extremely quick and immediately cached. Every subsequent time that the user opens the app, the shell files are loaded from the local device's cache, which results in blazing-fast startup times.

App shell architecture separates the core application infrastructure and UI from the data. All of the UI and infrastructure is cached locally using a service worker so that on subsequent loads, the Progressive Web App only needs to retrieve the necessary data, instead of having to load everything.

A service worker is a script that your browser runs in the background, separate from a web page, opening the door to features that don't need a web page or user interaction.

Put another way, the app shell is similar to the bundle of code that you'd publish to an app store when building a native app. It is the core components necessary to get your app off the ground, but likely does not contain the data. Why use the App Shell architecture?

Using the app shell architecture allows you to focus on speed, giving your Progressive Web App similar properties to native apps: Design the App Shell The first step is to break the design down into its core components.

What needs to be on screen immediately? What other UI components are key to our app? What supporting resources are needed for the app shell? For example images, JavaScript, styles, etc. We're going to create a Weather app as our first Progressive Web App.

The key components will consist of: For example, we could defer the loading of the New City dialog until after we've rendered the first run experience and have some idle cycles available. Implement your App Shell There are multiple ways to get started with any project, in this case, to keep our project as simple as possible and concentrate on Progressive Web Apps, we've provided you with all of the resources you'll need.

Remember, the key components will consist of: This ensures that the user sees the loader immediately as the page loads, giving them a clear indication that the content is loading.

To save time, we've also already created the stylesheet for you to use. We've given you the markup and styles to save you some time and make sure you're starting on a solid foundation. In the next section, you'll have an opportunity to write your own code.

Check out the key JavaScript app code Now that we have most of the UI ready, it's time to start hooking up the code to make everything work. Like the rest of the app shell, be conscious about what code is necessary as part of the key experience and what can be loaded later.

An app object that contains some of the key information necessary for the app. A method to add or update forecast cards app. A method to iterate the current cards and call app. Some fake data initialWeatherForecast you can use to quickly test how things render.

First lab 1 how is it

To see how the fake weather data is rendered, uncomment the following line at the bottom of your index. The result should be a nicely formatted though fake, as you can tell by the date forecast card with the spinner disabled, like this: Once you've tried it and verified it works as expected, you can remove the call to app.

We only needed it to ensure that everything worked as expected. Start with a fast first load Progressive Web Apps should start fast and be usable immediately.Discovery and naming.

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