New in the Upcoming Angular 20: APIs for Dynamic Components (Bindings & Directives)

Summary

In the upcoming Angular 20 release, developers will gain access to new APIs for creating dynamic components with advanced capabilities in bindings and directives. This introduction provides methods for two-way bindings, input and output connections, and offers more flexibility when developing interactive components such as a chat feature. Developers can create dynamic components inside parent templates more efficiently, utilize the new 'bindings' option for data management, and harness the 'directives' option for incorporating additional functionalities. Angular 20 aims to streamline and enrich the development process with these exciting updates.

Highlights

• Dynamic components in Angular 20 bring new APIs for bindings and directives. 💻
• The createComponent() method is central to dynamic component creation. 🌟
• Angular’s 'bindings' option enhances data binding between components. 🔗
• Output bindings execute functions with each new emitted value from the child. 🚀
• Two-way bindings ensure robust communication between parent and child signals. 🔄

Key Takeaways

• Angular 20 introduces exciting new APIs for dynamic components. 🎉
• The new 'bindings' option supports inputs, outputs, and two-way bindings. 🔄
• Create components dynamically with the createComponent() method. 🛠️
• Angular 20's 'directives' option allows bundling additional functionalities. 📜
• Input and output bindings facilitate smooth parent-child component interactions. 🤝

Overview

Angular 20 is set to revolutionize the way developers create dynamic components. With its introduction of advanced APIs for two-way data binding and directive use, developers can make their applications more interactive and efficient. This exciting update will streamline the creation of dynamic components in Angular, making it easier to integrate features like live chat into web applications.

The new createComponent() method in Angular 20 acts as the backbone for these dynamic components, allowing developers to instantiate components programmatically in their host containers. With the added 'bindings' feature, there is significant improvement in managing data flow between parent and child components, facilitating a seamless user experience.

Lastly, Angular 20's support for directives expands its versatility. Developers can now incorporate additional features more easily and configure component behavior dynamically using these directives. All these improvements spell a significant leap forward for Angular developers, promising more robust and dynamic web applications than ever before.

Chapters

• 00:00 - 00:30: Introduction to Dynamic Components in Angular 20 Introduction to Dynamic Components in Angular 20: This chapter introduces the new APIs for dynamic components in Angular 20. It covers the enhancements in bindings, two-way bindings, and directives. It also includes a practical example of creating a dynamic component by opening a component template and adding a host container, demonstrated through an online chat component in a user account.
• 00:30 - 01:00: Creating a Dynamic Chat Component The chapter titled 'Creating a Dynamic Chat Component' delves into the process of dynamically generating chat components within the account component. It explains the usage of the viewChild function to obtain a container reference via a template reference variable. This reference is subsequently stored as a signal within the chatContainer property. The text clarifies that the container reference instructs Angular to return a special container wrapper that facilitates the use of createComponent().
• 01:00 - 01:30: Opening the Chat with createComponent() In the chapter titled 'Opening the Chat with createComponent()', the discussion focuses on adding a button to open a chat feature upon clicking. The key method involved is createComponent(), which is used to dynamically create the chat component. It is crucial to note that the first argument for this function is the component's class name. Although the transcript provided cuts off before further details could be provided, it highlights the essential function call and its initial parameter.
• 01:30 - 02:00: Bindings and Directives Introduced in Angular 20 The chapter titled 'Bindings and Directives Introduced in Angular 20' introduces new options in Angular 20, specifically 'bindings' and 'directives'. These options enhance the capability to handle inputs, outputs, and two-way data bindings. It is crucial to import all necessary functions to utilize these options effectively. As an example, the chapter discusses passing an account balance to a chat application utilizing these features.
• 02:00 - 02:30: Input Binding Example The chapter titled 'Input Binding Example' explains the inputBinding() function, which is used to bind a property from a parent component to a child component in a framework. The function takes two arguments: the input property name in the child component and the value from the parent component. This value can be either a signal holding a dynamic value or a static value returned by a plain function.
• 02:30 - 03:00: Output Binding Example The chapter titled 'Output Binding Example' discusses the concept of output bindings in the context of child components. It explains the 'outputBinding' function, which requires two arguments: the output property name in the child component and a function that is executed whenever the child output property emits a new value.
• 03:00 - 03:30: Demonstrating Output Binding in Browser The chapter explores how to demonstrate output binding in a web browser, focusing on emitting values. It discusses taking a parameter as the emitted value's type and demonstrates adding buttons to a chat template for this purpose.
• 03:30 - 04:00: Two-Way Bindings In the chapter titled 'Two-Way Bindings', the discussion centers around how two-way data bindings work in software applications. It starts with an example demonstrating how the chat system passes the status of support access permission. The chapter then introduces the concept of two-way bindings and explains the twoWayBinding function, which requires two arguments.
• 04:00 - 04:30: Directives in Angular 20 This chapter discusses the concept of Directives in Angular 20, specifically focusing on the relationship between model properties in child components and writable signals in parent components. It explains how signals can establish a two-way binding between components, ensuring that changes in one component automatically update the other. The use of signals is emphasized for managing two-way data bindings in Angular applications.
• 04:30 - 05:00: Conclusion on Signals in Binding This chapter discusses the utilization of the directives option in a certain context. Directives, which are part of an array, can include their own bindings. Rather than solely using a directive name, an object is employed where the directive name is designated under a special property. This approach allows for specifying the bindings similarly to other scenarios.

New in the Upcoming Angular 20: APIs for Dynamic Components (Bindings & Directives) Transcription

• 00:00 - 00:30 Coming in Angular 20, dynamic components introduce new APIs for bindings, two-way bindings, and directives. First, let's remember how to create a dynamic component. Open the component template and add a host container for the dynamic component. We use an online chat component as an example. This parent component is a user account.
• 00:30 - 01:00 The сhat component is dynamically created in the account component. This viewChild function returns the container reference using a template reference variable. And this reference is stored as a signal in the chatContainer property. What does the container reference mean? This option tells Angular to return a special container wrapper providing createComponent().
• 01:00 - 01:30 Now let's add a button to open the chat on click. We use this reference to call createComponent() to dynamically create the chat component. The first argument is the component class name. The second argument
• 01:30 - 02:00 is an options object. Angular 20 introduces two new options: "bindings" and "directives". The bindings option supports inputs, outputs, and two-way bindings. All functions must be imported to be used. For example, we want to pass the account balance to this chat.
• 02:00 - 02:30 From parent to child. The inputBinding() function takes two arguments: the input property name in the child component and the value from the parent component. This value can be a signal holding a value or a plain function returning one.
• 02:30 - 03:00 Next, let's move on to output bindings. The outputBinding function also takes two arguments: the output property name in the child component and a function. This function is executed every time the child output property emits a new value
• 03:00 - 03:30 and takes this value as a parameter. This is the type of the emitted value. Let's add buttons to the chat template to emit values.
• 03:30 - 04:00 Let's see how it looks in the browser. In this example, the chat passes the status of support access permission. Next, let's move on to two-way bindings. The twoWayBinding function also takes two arguments:
• 04:00 - 04:30 the model property name in the child component and a writable signal in the parent component. Now the two signals are connected. Any change to one automatically updates the second. We must use a signal for two-way bindings.
• 04:30 - 05:00 Next, let's move on to the directives option. This option is an array of directives. A directive can have its own bindings. In this case, instead of just a directive name, we use an object. The directive name is specified in a special property of this object. And we specify bindings in the same way.
• 05:00 - 05:30 We must use a signal for two-way bindings.