Templates and data binding

Templates and Data Binding in Angular

Templates and data binding are two essential features of Angular that make it easy to create dynamic and interactive user interfaces. In this post, we'll discuss these concepts in more detail and provide examples of how they work in practice.

Templates

In Angular, templates define the structure and layout of the user interface. Templates are typically written in HTML, but they also include additional syntax that allows for more advanced features like conditionals and loops. These advanced features are made possible by Angular's template syntax, which extends HTML with additional features.

Structural directives like *ngFor and *ngIf allow developers to conditionally render elements or repeat elements based on data from the component class. For example, you can use *ngFor to render a list of items from an array in the component class.

<ul>
    <li *ngFor="let item of items">{{ item }}</li>
</ul>

Data Binding

Data binding in Angular is the process of connecting data from the component class to the template. There are four types of data binding in Angular: interpolation, property binding, event binding, and two-way binding.

• Interpolation: Interpolation is used to display data in the template using the double curly braces syntax ({{ }}). For example: {{ name }}.

• Property Binding: Property binding is used to set the value of an element's property based on data from the component class. This is done using square brackets ([]). For example: <img [src]="imageUrl">.

• Event Binding: Event binding is used to bind a component class method to an event in the template. This is done using parentheses (()). For example: <button (click)="onClick()">Click me</button>.

• Two-Way Binding: Two-way binding is used to bind a component class property to an element's value and to update the property when the element's value changes. This is done using the [(ngModel)] directive. For example: <input [(ngModel)]="name">.

Conclusion

Templates and data binding are essential concepts in Angular that allow developers to create dynamic and interactive web applications. By using templates and data binding, developers can create reusable and maintainable code that is easy to read and understand.