Introducing to
Angular 17: Front-End Development
Quick Summary: The Google Angular Team never fails to make the Angular developer
community even more excited with the new release. Therefore, the latest version
of the popular Angular framework – Angular v17 is here. In this article, we are
going to talk about the overview of Angular v17 and its features, updates, and
improvements. In the end, it will help you decide why you should migrate to
Angular 17 and what features you can leverage.
Finally, after a long wait, the latest version of
frontend framework - Angular, is here.
Angular v17!
Google team released the latest version of Angular –
Angular 17 on November 6, 2023, creating a significant milestone for the front end development. While we previously covered the impressive updates and modifications
in Angular 16 in our blog, the stakes are even higher this time with the latest
Angular version.
Angular team has stepped up to deliver some of the
excellent features to the front end community before we bid farewell to 2023.
One of the most exciting features of Angular 17 is
the declarative control flow syntax. This actually helps developers with more
efficient and expressive template syntax.
Furthermore, Angular 17 introduces deferrable views,
allowing you to load and render views only when needed. However, we will cover
new features and updates of Angular 17 in this article with examples.
The updates in Angular 17 are a result of the
Angular team’s continuous improvement and efforts to address the challenges and
feedback of the Angular community. With every new release and update of
Angular, it continues to empower developers. Therefore, you can leverage
the AngularJS
development services to take the most advantage of new
features.
In this article, we are going to talk about the new
release of Angular 17. We will also discuss the latest updates and features in
detail to elevate your Angular applications.
In addition, you can hire Angular
developers from SoftwareTechIT to leverage
features to create a robust web application.
Introduction to
Angular 17
The introduction of Angular v17 is not just about
new releases or improvements; it’s a holistic renaissance that brings forward a
suite of enhancements and a fresh identity for Angular.
The Angular team has been working hard to resolve
challenges and deliver improved performance and developer experience on the
modern web. That’s what made them introduce Angular’s reactivity system, Server
Side Rendering (SSR), and many other features in Angular 17.
In addition, Angular 17 comes with Standalone
Components and Signals as part of this movement. Angular 17 offers better
Angular Renaissance as it comes with a new syntax for control flow, lazy
loading of page parts, and better support for SSR. In addition, the CLI now
relies on ESBuild, and thus enhances the build significantly.
In the coming days, they are planning to release
Angular v17, including deferred views, built-in control flow, SSR enhancements,
and view transitions API support. In fact, you will soon experience it once you install
angular on your system and migrate to Angular v17.
What’s New in
Angular 17: Features and Updates
Angular 17 is the highly anticipated release for the
Angular community, bringing many new exciting features, updates, and
improvements. Let’s check out what are new features of Angular 17:
·
New Syntax for Control Flow in
Templates
·
Automatic Migration to Build-in
Control Flow
·
Build Performance with ESBuild
·
Enhanced Support for Server Side
Rendering (SSR)
·
Deferred Loading
New Syntax for
Control Flow in Templates
Angular v17 introduces a new declarative control
flow syntax that makes writing and managing complex conditional codes easier.
The new control flow syntax is based on the @- syntax, which is similar to the
syntax used in other programming languages like JavaScript
and Python.
You can use the new declarative control flow syntax
in Angular 17 with the following steps:
First step is to import the @angular/core module.
Add the @ prefix to the name of the control flow
directive. It means that you have to use @if instead of NgIf.
Use the @ directive to wrap the content you wish to
display conditionally.
Pass an expression to the @ directive to evaluate
the condition. If the value of the expression is true, then the content inside
the @ directive will be shown to you.
You can write the following code to display a
message only if the isLoggedIn variable is true using @if directive.
<div
@if="isLoggedIn">
Great! You are logged in successfully.
</div>
In fact, to create more complex conditional logic,
you can use the @else and @else if directives.
Here, we will show you a code to use the @if, @else
if, and @else directives to display a different message based on the
value of the available role.
<div @if="role ===
'admin'">
You’re logged in as an admin.
</div>
<div @else if="role === 'user'">
You’re logged in as a user.
</div>
<div @else>
You’re not logged in.
</div>
Compared to the previous NgIf, NgFor, and NgSwitch
directives, the new declarative control flow syntax is easier to understand and
more expressive. Additionally, it facilitates the creation and upkeep of
intricate conditional logic.
Any kind of HTML content, including other
directives, components, and templates, can be wrapped using the @ directive.
The @ directive can also be used to regulate which
elements on the page are shown. The @if directive, for instance, can be used to
hide a button in the event that a particular condition is not met.
The @ directive can be used to construct nested
conditional statements. For instance, you might check if a user is logged in
using the @if directive and then determine if they have a specific role by
using a second @if directive inside the first @if directive.
You can use the following syntax for declarative
control flow syntax:
<div
@if="condition">
If the condition is true, your content will be displayed here.
</div>
Use the following syntax for deferrable views:
<div
@defer="condition">
When the condition is true, your content will be loaded lazily.
</div>
Use the following syntax for View Transition API:
<div
@transition="animation">
This content will be animated when it is transitioned to or from.
</div>
Automatic
Migration to Build-in Control Flow
If you want to migrate your code to the new control
flow syntax automatically, there is a schematic in the @angular/core
package:
ng g
@angular/core:control-flow
Build
Performance with ESBuild
Generally, the Angular CLI is used to generate
bundles using webpack. Nevertheless, more recent and quicker tools are
currently posing a threat to webpack.
Angular 17 comes with a stable version of Angular
CLI by default for new Angular projects with the Application Builder. After
reading the detailed installation guide, you can install Angular CLI on your Windows system.
You can easily move to ESBuild for your existing
projects. For that, you have to update your angular.json file with the
following code:
"builder" :
"@angular-devkit/build-angular:browser-esbuild"
In fact, -esbuild needs to be added at the end. For
the most part, ng serve and ng build should function normally, albeit much more
quickly. The former builds npm packages only when necessary, using the vite dev
server to speed up processes. The CLI team also included several further
performance enhancements.
Create High-Performing Web Applications in Less Time
with Angular CLI
Experience the Efficiency of Angular
Enhanced Support for Server Side Rendering (SSR)
Angular 17 offers better support for server-side
rendering (SSR). Hence, if you create a new project using ng new, a --ssr
switch is now available. If this is not used, the CLI asks whether it should
set up SSR:
Add @angular/ssr package to enable SSR later
with the following code:
ng add @angular/ssr
As @angular scope makes evident, the Angular
team is the source of this package.
In addition to rendering on the server side, a call
to ng serve launches a development server that provides the bundles needed for
browser functioning. In addition to handling bundles for both worlds, a call to
ng build --ssr builds a basic Node.js server whose source code uses the
schematics mentioned above.
If you don’t want to execute a Node.js server, you
can use ng build --prerender to prerender the individual routes of the
application during build.
Deferred Loading
Angular's "Defer" feature is a new
template syntax that allows developers to define the circumstances under which
specific elements or components should load. This is more advanced than the
conventional lazy loading methods, which usually load components in response to
changes in the path.
You can now use "Defer" to delay component
loading in reaction to user inputs, like clicks or hovers, or even when certain
conditions are satisfied in your application logic.
Some of the interesting key features of Defer are:
Conditional
Loading: You can set conditions for when dependencies
should load using "Defer." This lowers initial load times and
conserves resources because components can wait to load until they are actually
needed.
Standalone
Dependencies: For a dependency to be deferred, it must be standalone.
If the dependency is not standalone or is referenced outside of the @defer block, it will load immediately.
Integration
with Loading Blocks: Loading blocks can be utilized in conjunction
with the "Defer" feature. These blocks allow you to set the
placeholder or spinner that will appear during the delayed dependencies load.
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Other
Features of Angular 17
Angular 17 also introduces some other new features
and updates, such as:
Angular 17 now extends support for custom element
bindings and element providers.
The latest version of Angular 17 comes with better
support for internationalization and accessibility.
The router now supports the View Transitions API.
Animations can now be loaded lazily.
The ng g interceptor statement generates
functional interceptors.
When reading signals in templates, a diagnostic now
warns the user if the getter call was forgotten (for example, {{ products }} instead of {{
products() }}).
A change to a data-bound Signal makes Angular just
to mark the components directly affected by this change (=components that
data-brind this Signal) as dirty. This differs from the traditional behavior
that marks all parents as dirty. Utilizing this in conjunction with OnPush
enhances performance. Furthermore, this represents an initial step towards the
envisioned more precise change detection.
The Angular CLI generates standalone pipes,
standalone components, and standalone directives. By default, ng new also offers independent component bootstrapping. The –standalone false switch has the ability to disable the behavior.
First released in Angular 12, the Ivy compiler is
the next version of the Angular compiler. You can see several enhancements of
the Ivy compiler in Angular 17, increasing its speed and effectiveness.
How
to Install Angular 17?
You can install Angular 17 using
the npm (Node Package Manager). This comes with multiple Angular tools.
Execute the following command in
the CLI.
npm install --global @angular/cli@next
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