Angular 5高级编程指南

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"Angular 5 高级编程，由 Adam Freeman 撰写的 Pro Angular 第二版，详细介绍了如何利用现代网络浏览器技术在应用代码中发挥潜力。" 在本书《Pro Angular 5》第二版中，作者 Adam Freeman 提供了深入且全面的指导，帮助开发者掌握 Angular 5 框架的高级特性与最佳实践。这本书是为已经熟悉基础的 Angular 开发者设计的，旨在提升他们对这个流行的前端框架的理解和应用水平。 Angular 5 是一个强大的 JavaScript 框架，用于构建单页应用程序（SPA），它提供了模块化、依赖注入、数据绑定、路由和组件化等特性，极大地简化了前端开发工作。在这个第二版中，作者更新了内容以适应 Angular 5 的最新变化，包括性能优化、响应式Web设计以及更好的类型检查等改进。书中涵盖的关键知识点包括： 1. **Angular模块**：学习如何创建和管理模块，理解模块在大型应用中的重要性，以及如何有效地组织和导入模块。 2. **组件和指令**：深入理解组件的生命周期、属性绑定、事件处理和指令的创建，以及何时使用内置指令和自定义指令。 3. **依赖注入**：了解 Angular 的依赖注入系统，如何注入服务并实现松耦合的代码结构。 4. **服务**：学习如何创建和使用服务，包括 HTTP 客户端、路由服务和其他核心服务，以及自定义服务的最佳实践。 5. **路由与导航**：探索 Angular 的路由系统，学习如何定义路由配置，实现页面间导航，以及处理路由参数和守卫。 6. **表单和验证**：掌握 Angular 的模板驱动和响应式表单，以及如何进行客户端和服务器端验证。 7. **数据绑定**：理解双向数据绑定的工作原理，以及如何使用管道和异步数据流。 8. **测试与调试**：学习单元测试、端到端测试的策略，以及使用 Angular 的内置工具和外部库进行调试的方法。 9. **性能优化**：探讨提高 Angular 应用性能的各种技巧，如懒加载、AOT编译、Tree Shaking 和资源优化。 10. **部署与持续集成**：了解如何将 Angular 应用部署到生产环境，并设置持续集成和持续部署（CI/CD）流程。此外，书中还涵盖了 RxJS，这是一个用于处理异步数据流的库，它是 Angular 中的重要组成部分。通过实例和实战项目，读者可以学习如何有效地利用 RxJS 进行状态管理和响应式编程。《Pro Angular 5》第二版是进阶 Angular 开发者的宝贵资源，它提供了丰富的实战经验和深度解析，有助于开发者提升技能，构建高效、可维护的现代 Web 应用程序。

■ Contents

xvi

■Chapter 15: Creating Attribute Directives �� 337

Preparing the Example Project �� 338

Creating a Simple Attribute Directive �� 340

Applying a Custom Directive ��341

Accessing Application Data in a Directive �� 343

Reading Host Element Attributes �� 343

Creating Data-Bound Input Properties ��346

Responding to Input Property Changes �� 349

Creating Custom Events �� 351

Binding to a Custom Event �� 353

Creating Host Element Bindings �� 354

Creating a Two-Way Binding on the Host Element �� 355

Exporting a Directive for Use in a Template Variable �� 359

Summary �� 362

■Chapter 16: Creating Structural Directives �� 363

Preparing the Example Project �� 364

Creating a Simple Structural Directive �� 365

Implementing the Structural Directive Class �� 366

Enabling the Structural Directive ��368

Using the Concise Structural Directive Syntax ��370

Creating Iterating Structural Directives �� 371

Providing Additional Context Data �� 374

Using the Concise Structure Syntax ��376

Dealing with Property-Level Data Changes �� 377

Dealing with Collection-Level Data Changes �� 379

Querying the Host Element Content �� 390

Querying Multiple Content Children �� 394

Receiving Query Change Notiﬁcations �� 396

Summary �� 397

■ Contents

xvii

■Chapter 17: Understanding Components �� 399

Preparing the Example Project �� 400

Structuring an Application with Components �� 401

Creating New Components �� 402

Deﬁning Templates ��406

Completing the Component Restructure ��417

Using Component Styles �� 417

Deﬁning External Component Styles �� 419

Using Advanced Style Features �� 420

Querying Template Content �� 428

Summary �� 431

■Chapter 18: Using and Creating Pipes �� 433

Preparing the Example Project �� 434

Installing the Internationalization Polyﬁll �� 436

Understanding Pipes �� 439

Creating a Custom Pipe �� 440

Registering a Custom Pipe �� 441

Applying a Custom Pipe �� 442

Combining Pipes �� 443

Creating Impure Pipes ��444

Using the Built-in Pipes �� 448

Formatting Numbers �� 449

Formatting Currency Values �� 451

Formatting Percentages �� 454

Formatting Dates �� 456

Changing String Case �� 459

Serializing Data as JSON �� 460

Slicing Data Arrays �� 461

Summary �� 463

■ Contents

xviii

■Chapter 19: Using Services �� 465

Preparing the Example Project �� 466

Understanding the Object Distribution Problem �� 467

Demonstrating the Problem ��467

Distributing Objects as Services Using Dependency Injection �� 472

Declaring Dependencies in Other Building Blocks ��478

Understanding the Test Isolation Problem �� 484

Isolating Components Using Services and Dependency Injection �� 485

Completing the Adoption of Services �� 488

Updating the Root Component and Template �� 488

Updating the Child Components �� 489

Summary �� 491

■Chapter 20: Using Service Providers �� 493

Preparing the Example Project �� 494

Using Service Providers �� 496

Using the Class Provider ��498

Using the Value Provider ��506

Using the Factory Provider �� 508

Using the Existing Service Provider �� 511

Using Local Providers �� 512

Understanding the Limitations of Single Service Objects�� 513

Creating Local Providers in a Directive ��514

Creating Local Providers in a Component ��516

Controlling Dependency Resolution ��521

Summary �� 523

■Chapter 21: Using and Creating Modules �� 525

Preparing the Example Project �� 526

Understanding the Root Module �� 528

Understanding the Imports Property �� 530

Understanding the Declarations Property ��530

■ Contents

xix

Understanding the Providers Property ��531

Understanding the Bootstrap Property ��531

Creating Feature Modules �� 533

Creating a Model Module ��535

Creating a Utility Feature Module ��539

Creating a Feature Module with Components ��545

Summary �� 549

■Chapter 22: Creating the Example Project �� 551

Starting the Example Project �� 551

Adding and Conﬁguring the Packages �� 552

Conﬁguring TypeScript��553

Conﬁguring the Development HTTP Server �� 553

Conﬁguring the JavaScript Module Loader ��554

Creating the Model Module �� 554

Creating the Product Data Type ��554

Creating the Data Source and Repository �� 555

Completing the Model Module �� 556

Creating the Core Module �� 557

Creating the Shared State Service �� 557

Creating the Table Component ��557

Creating the Form Component �� 559

Completing the Core Module ��561

Creating the Messages Module �� 562

Creating the Message Model and Service �� 562

Creating the Component and Template ��563

Completing the Message Module �� 563

Completing the Project �� 564

Creating the Angular Bootstrap �� 564

Creating the Reactive Extensions Module ��565

Creating the HTML Document ��565

■ Contents

Running the Example Project �� 566

Summary �� 567

■Chapter 23: Using Reactive Extensions �� 569

Preparing the Example Project �� 570

Understanding the Problem �� 571

Solving the Problem with Reactive Extensions �� 573

Understanding Observables �� 574

Understanding Observers �� 576

Understanding Subjects �� 577

Using the Async Pipe �� 578

Using the Async Pipe with Custom Pipes �� 579

Scaling Up Application Feature Modules �� 581

Going Beyond the Basics �� 584

Filtering Events �� 585

Transforming Events �� 586

Receiving Only Distinct Events �� 589

Taking and Skipping Events ��591

Summary �� 592

■Chapter 24: Making Asynchronous HTTP Requests �� 593

Preparing the Example Project �� 594

Conﬁguring the JavaScript Module Loader ��595

Conﬁguring the Model Feature Module ��596

Updating the Form Component �� 597

Running the Example Project �� 597

Understanding RESTful Web Services �� 598

Replacing the Static Data Source �� 599

Creating the New Data Source Service �� 600

Conﬁguring the Data Source��602

Using the REST Data Source ��603

Saving and Deleting Data ��605

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