1. Introduction

1.1. Brief Explanation of the Tutorial's Goal

The aim of this tutorial is to understand the concept of data binding in Angular and learn how to bind component data to the HTML template.

1.2. What the User Will Learn

By the end of this tutorial, you should be able to:

• Understand data binding in Angular
• Bind component data to the HTML template
• Use interpolation in Angular

1.3. Prerequisites

Before you proceed, you should have:

• Basic knowledge of JavaScript and TypeScript
• Basic understanding of Angular components

2. Step-by-Step Guide

2.1. Data Binding in Angular

Data binding in Angular is a technique to link your data to your view layer. By binding a variable, you are essentially creating a two-way data binding - the model and view.

2.2. Interpolation

Interpolation is a special syntax that Angular converts into property binding. It’s a way to display a component property in the HTML template. It is denoted by double curly braces: {{ }}.

2.3. Property Binding

Property binding is one way, from the component to the view. It involves binding DOM properties (values) to a component’s property.

2.4. Best Practices and Tips

• Always declare your variables in your component before you attempt to bind them.
• Avoid complex logic in your templates, keep it simple.

3. Code Examples

3.1. Interpolation

// app.component.ts
export class AppComponent {
  title = 'Hello World';
}

<!-- app.component.html -->
<h1>{{ title }}</h1>

In the above example, {{ title }} in the HTML will be replaced by the value of the title property from the component.

3.2. Property Binding

// app.component.ts
export class AppComponent {
  isDisabled = true;
}

<!-- app.component.html -->
<button [disabled]="isDisabled">Click me</button>

In this example, the button's disabled attribute is bound to the isDisabled property from the component. If isDisabled is true, the button will be disabled.

4. Summary

In this tutorial, we learned about data binding in Angular, how to bind component data to the HTML template, and the usage of interpolation. We explored property binding and provided examples for each.

5. Practice Exercises

5.1. Exercise 1

Create a new component with a property message and display this property in the HTML template using interpolation.

5.2. Solution 1

// message.component.ts
export class MessageComponent {
  message = 'Hello Angular';
}

<!-- message.component.html -->
<p>{{ message }}</p>

In the above example, the message property from the component is displayed in the HTML template.

5.3. Exercise 2

Create a new component with a property isHidden and bind this property to the hidden attribute of a div in the HTML template.

5.4. Solution 2

// visibility.component.ts
export class VisibilityComponent {
  isHidden = false;
}

<!-- visibility.component.html -->
<div [hidden]="isHidden">This is a visible div</div>

In this example, the div's hidden attribute is bound to the isHidden property from the component. If isHidden is true, the div will be hidden.

5.5. Tips for Further Practice

Try to create more complex scenarios using interpolation and property binding. Experiment with different HTML elements and attributes. The more you practice, the more comfortable you'll become with data binding in Angular.