Ext.NET与Web应用开发实战指南

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"这是一本关于Ext.NET用于Web应用程序开发的教程，内容涵盖了使用Ext.NET与ASP.NET WebForms和ASP.NET MVC构建富互联网应用的详细指南。由Anup Shah撰写，版权属于Packt Publishing。" 在深入探讨Ext.NET Web应用程序开发之前，首先需要理解一些基本概念。Ext.NET是一个基于JavaScript的UI库，它为ASP.NET开发者提供了丰富的组件和工具，以构建功能强大、用户界面友好的Web应用。这个框架基于Ext JS，但专门针对.NET环境进行了优化，使得开发人员可以利用.NET的强大功能同时享受JavaScript库带来的灵活性。在使用Ext.NET进行Web开发时，你将学习到以下关键知识点： 1. **Ext.NET组件**：Ext.NET提供了一系列预构建的UI组件，如表格、面板、表单、树形视图、菜单、图表等，这些组件能够帮助快速构建复杂的用户界面。 2. **数据绑定**：通过Ext.NET，你可以轻松地将数据绑定到UI组件，支持各种数据源，如.NET集合、XML、JSON等，实现数据的动态展示和交互。 3. **ASP.NET WebForms集成**：Ext.NET与ASP.NET WebForms紧密集成，允许使用熟悉的服务器控件模型进行开发，同时享受到客户端脚本的优势。 4. **ASP.NET MVC支持**：对于更现代和灵活的开发模式，Ext.NET也支持ASP.NET MVC框架，使得你可以利用MVC模式进行分层设计。 5. **事件处理**：Ext.NET提供了丰富的事件处理机制，允许开发者在客户端和服务器端对用户操作进行响应，实现复杂的业务逻辑。 6. **主题和皮肤**：Ext.NET提供了多种预定义的主题，允许自定义UI外观，以满足不同项目的需求。 7. **Ajax支持**：通过Ajax技术，Ext.NET能实现页面的部分更新，提高用户体验，降低网络传输开销。 8. **性能优化**：学习如何优化Ext.NET应用程序的性能，包括压缩和合并JavaScript及CSS，减少HTTP请求，以及合理使用组件和数据加载策略。 9. **调试和测试**：了解如何使用开发工具（如Chrome DevTools、Firebug等）进行Ext.NET应用的调试，以及如何进行单元测试和集成测试。 10. **版本管理和升级**：随着Ext.NET新版本的发布，了解如何管理项目中的依赖版本，以及如何平滑地升级到新版本，以利用最新特性。这本书将引导你通过一系列实践示例，从基础到高级，逐步掌握Ext.NET的使用。无论你是ASP.NET新手还是有经验的开发者，都能从中受益，提升Web应用开发的效率和质量。请注意，虽然书中尽力确保信息准确，但在实际应用中仍需根据实际情况进行调整，并遵循相关许可协议。

Table of Contents

[ vii ]

What else can you do with TreePanels? 297

TabPanel 298

TabPanel – overview 298

Asynchronous tab loading 301

Useful tab features 302

Tabs rendered at the bottom 303

Plain tabs 303

TabScrollerMenu plugin 303

Tab menus 304

Using TabBar to add custom toolbar items 307

More TabPanel examples 308

Summary 309

Extending Ext.NET – Custom Controls and Plugins 311

Basic control builder 312

Example 312

Benets of this approach 316

Drawbacks to this approach 316

Extending Ext.NET controls 316

Extending the Ext.NET class 316

Extending the Ext JS class 318

Embedding the resources 321

Declaring your embedded web resources 322

Adding your embedded resources to your Ext.NET component 322

Custom events 323

Dening the event in the JavaScript class 324

Dening the client-side event on the server side 324

Creating a custom DirectEvent 329

Passing properties to your JavaScript class 332

Using the custom component on an ASP.NET Web Form 333

Using your custom component in ASP.NET MVC (Razor) 334

A basic control renderer 335

Reusing Ext.NET's builder pattern for a richer custom MVC framework for

your own application 336

Recap of steps to create a custom component 341

Scenario 1 – simple subclass, no custom events, no custom JavaScript or CSS 343

Scenario 2 – simple subclass, no custom events, but with custom JavaScript or CSS 343

Scenario 3 – subclass with custom Listeners and/or DirectEvents, and custom

JavaScript/CSS 343

Component design considerations 344

Building more complex controls through composition 344

GenericComponent<T> – a quick alternative to wrap Ext JS ready Components 345

Declaring DirectMethods on custom components 345

Supporting ASP.NET Web Forms IPostBackDataHandler 345

Preface

[ 2 ]

Chapter 4, AJAX with Ext.NET, looks at the powerful AJAX options Ext.NET

supports. We cover the powerful DirectEvents and DirectMethods features, as well

as AJAX options specic to certain controls. This is a powerful chapter that lays the

foundation for slick and usable applications that are responsive to user interactions.

Chapter 5, Working with Data, looks at the powerful data handling techniques

available in Ext.NET. We cover XTemplates, which allows you to dene HTML

templates to bind data to, and we explain the Stores, Models, and Proxies

architecture that allows for powerful data-binding reuse across many Ext.NET

components. The ComboBox and DataView are introduced as examples of controls

that reuse this architecture.

Chapter 6, Introducing GridPanels, covers the popular and highly sophisticated

GridPanel control. It is another control that reuses the Stores, Models, and Proxies

architecture, but is given its own chapter. We look at various features of the

GridPanel such as paging, ltering, sorting, grouping, column summaries, row

expanding, and selection models. We also look at how grid editing can be enabled,

including in-line grid editing at the row or cell level. As large as this chapter is, there

are many other GridPanel capabilities that we have not been able to t into this book,

so many links to further examples and resources are also provided.

Chapter 7, Forms and Validation, looks at the numerous form controls available in Ext.

NET, how to lay them out, and how to enable client and remote validation. We also

look at how custom validators can be created. Lastly, we also see how Ext.NET's

data-binding capabilities can also be reused with forms.

Chapter 8, Trees and Tabs with Ext.NET, introduces the popular TreePanel and

TabPanel controls. Due to limited space in the book, we cannot cover all the

sophisticated possibilities that these controls offer, but we do provide an overview

of how tree nodes can be loaded asynchronously and how to reuse the Store,

Models, and Proxies architecture to bind data to trees. We also look at various ways

TabPanels can be congured, including how to load content on-demand using

various AJAX techniques supported by Ext.NET.

Chapter 9, Extending Ext.NET Controls – Custom Controls and Plugins, is perhaps the

most powerful chapter in this book. It shows you how to extend Ext.NET controls

in a variety of ways to support both ASP.NET Web Forms and ASP.NET MVC

Razor templates, enabling you to create highly reusable components. Most of the

chapter looks at how controls can be extended, but we also look at how you can

use the available plugin mechanisms to reuse functionality across different types

of components.

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