Navigation and dialogs in VB.NET

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Navigation and dialogs
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This chapter covers
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Browser navigation The Navigation Application template Using navigation with out-of-browser applications Working with common dialogs Creating custom dialogs and pop-ups
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When you first created a Silverlight 2 application, you ended up with a project that contained a single white main page, probably sized at 300 x 400, depending on the template you used. There was no guidance for structuring your application or how to move from page to page. Unlike HTML pages or WPF/Windows Forms, the navigation structure wasn t something intuitive, building on a decade or more of knowledge and established patterns. Instead, most new Silverlight developers were left staring that that blank page, wondering what to do next. Silverlight 3 introduced not only a complete navigation framework, but also an application template built on this framework. The navigation framework takes a modern browser-oriented approach to navigation, supporting concepts such as journal histories, back-and-forward navigation, and uniquely addressable pages. This framework addressed the needs of both application structure and end-user navigation.
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Browser navigation background
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Silverlight also supports dialog content. In addition to the standard open and save dialogs provided by the operating system, you can create your own simulated dialogs using controls such as Popup and ChildWindow. In this chapter, we ll dive deep into Silverlight navigation, followed up with a look at how to handle pop-ups and dialogs. We ll look to history to inform us about how navigation is handled in the browser and how hashtags or URI fragments work. From there, you ll start building an application using the navigation template. The navigation template will then be used to explore navigation to individual pages and customization of navigation. After we complete the tour of navigation, we ll turn our eye to dialogs and child windows, including the operating system provided file dialogs and the Silverlight Popup and ChildWindow classes. Before diving into Silverlight navigation, let s take a look at a well-established navigation paradigm as used by the web browser.
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15.1 Browser navigation background
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The introduction of GUI web browsers hailed a new approach to navigation. Prior to Mosaic, the typical modes for navigation were either keyboard commands or drop-down menus. Most applications had multiple windows and were wizard-driven or dialogdriven. Browsers introduced two key things:
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Navigation to previously visited pages using Back and Forward buttons, with retained history on both Navigation to new pages using hyperlinks
This may seem pretty unexciting now, but it wasn t a mainstream approach at the time. Applications didn t contain a single frame that was swapped in and out with different bits of content. With the ubiquity of web browsers came new demands for how applications worked. It was expected that your applications, especially if hosted in a browser, would use a forward/backward and link paradigm. This worked fine for the period of time when browser applications were all server-processed and static client. Think ASP, CGI, and similar application types. Outlook Web Access (OWA), released in 2000, had bits of functionality that other application developers realized could make the web a better place. OWA was making network calls back to the server to get new content, but did it without any sort of postback or even an iframe. Developers looked to see how this application (and others such as Gmail in 2004) were written, and began to adopt the approach themselves. Around 2003 (give or take a year or two), Ajax applications based on JavaScript, asynchronous network calls, and client-side HTML DOM manipulation began to rise in popularity. Ajax applications are and were a web approach designed to provide interactive client-side desktop application like functionality to the web pages. Unfortunately, as Ajax applications became more and more complex, they made browser back/forward navigation unreliable. Newsgroups at the time were full of
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