Angular 17 Tutorial: What's new in Angular 17

Angular 17 Tutorial: An Overview

Experience the total revamp of Angular v17 with insights from our comprehensive Angular Tutorial, bringing more than just a set of new functionalities. To start, there will be enhanced developer experience, improved performance, and a new look. Our Angular Training teaches you how to use standalone components, signals, and new syntax in Angular. Benefit from faster build speeds that are driven by ESBuild's CLI."

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What is Angular 17

Angular 17 is more than simply a collection of new features; it represents a full redesign of the Angular framework. It promises an enhanced developer experience, enhanced performance, and a new look. Highlights include signals, a new syntax for control flow and lazy loading, standalone components, and an ESBuild-powered CLI.

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How to Install Angular 17?

Check for Node.js and npm

• Make sure you have installed npm (version 5.6 or later) and Node.js (version 14 or later).
• To verify, use npm -v and node -v in your terminal.
• If not, go to https://nodejs.org/ to download and install Node.js.

Install Angular CLI globally

• Open your terminal and run: npm install -g @angular/cli@17

What’s New in Angular 17: Features and Updates

1. New Syntax for Control Flow in Templates

• To utilize the declarative control flow syntax, import @angular/core.
• Instead of using NgIf, NgFor, and NgSwitch, use @if, @else, and if.
• Use @ directives in angular to conditionally wrap content and pass expressions for evaluation.
• Using <div @if="isLoggedIn">...</div> as an example
• Use the @else and @else if directives to create intricate reasoning.
• Conditional logic is easier to construct and maintain with the new syntax, which is also more expressive and accessible.
• Use @ to enclose any HTML content, including components, directives, and templates.
• Use @ to control an element's visibility; for example, use @if to hide a button.
• Construct nested conditional statements using @, such as verifying the role and login of the user.

2. Automatic Migration to Build-in Control Flow

• The @angular/core package has a schematic that you can use to automatically convert your code to the new control flow syntax: ng g @angular/core:control-flow

3. Build Performance with ESBuild

• Angular CLI now challenges Webpack's hegemony by bundling quicker via ESBuild.
• New Angular 17 projects are created using ESBuild by default.
• Simply add -esbuild to commands to convert current projects to ESBuild.
• With ESBuild, ng serves and ng build function as usual, but much more quickly.
• Vite dev server is used to build npm packages only when necessary, for maximum performance.
• The CLI team made additional speed improvements.
• An installation manual for Windows systems' Angular CLI is accessible.
• The Angular 17 CLI includes the Stable Application Builder.

4. Enhanced Support for Server Side Rendering (SSR)

• Easily enable SSR by adding @angular/ssr later or by using the --ssr switch during ng new.
• Browser bundles for development and server-side rendering are handled by ng serve.
• Bundles are created for a Node.js server and both environments using ng build --ssr.
• Use ng build --prerender to render individual routes without the need for a Node.js server.
• The @angular/ssr package, for SSR capabilities, is provided by the Angular team.
• Improved SSR setting and setup thanks to new schematics.
• SSR provides enhanced user experience, performance, and SEO.
• Take into account SSR for apps that depend heavily on content or SEO.

5. Deferred Loading

• A new template syntax for the conditional loading of elements and angular components is called Defer.
• Exceeds traditional lazy loading by allowing loading contingent on conditions or user inputs.
• Loading components only when necessary cuts down on initial load times and conserves resources.
• Needs deferring independent dependencies.
• Integrates spinners or placeholders during loading with loading blocks.
• Compatible with viewport events, timers, hovers, clicks, and custom circumstances as triggers.
• Can be used to preload components in the background for quicker loading in conjunction with prefetching.
• Perfect for big components loaded after certain interactions or below the fold.

Other Features of Angular 17

• Support for unique element bindings and element providers has been expanded in Angular 17.
• Improved support for internationalization and accessibility is included in Angular 17's most recent version.
• The View Transitions API can now be used with the router.
• Animations are now able to load slowly.
• Functional interceptors are produced by the ng g interceptor command.
• A diagnostic now alerts the user when reading signals in templates if the getter call was overlooked (e.g., {{ products }} instead of {{ products() }}).
• A modification to a data-bound signal causes Angular to only identify as dirty the components that are directly impacted by the change (i.e., the components that data-brind this signal).
• One can create standalone directives, standalone components, and standalone pipelines using the Angular CLI. Additionally, independent component bootstrapping is provided by ng new by default. The behavior can be turned off using the –standalone false option.
• The Ivy compiler is the next iteration of the Angular compiler, initially introduced with Angular 12. Angular 17 has improved the Ivy compiler in several ways, making it faster and more efficient.

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Summary

Angular 17 is not merely an update; it's a complete redesign. It has a fresh appearance, a better developer interface, and better performance. Highlights include new control flow syntax, signals, and standalone components. The CLI powered by ESBuild accelerates builds. Improved SSR support, deferred loading, and expanded element binding/provider support are some of the additional features.

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