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How do we disable the Back button questions. Clicking the Back button navigated off the page, completely destroying the application state. Java applets and, later, Flash applications ran into the same problem. Eventually, both browser makers and the application framework developers were able to work together to provide an approach for interacting with the browser journal, the structure in the browser that keeps track of your navigation history. The rest is, well, history.1 In this section, we ll briefly cover how the browser journal works and how it interacts with anchor tags on a typical web page. With that grounding, we ll then be able to look at Silverlight navigation in the subsequent sections.
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15.1.1 Browser journals
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The browser journal keeps track of your navigation history for a session. It s what allows you to click the Back button to open the previous page and then click the Forward button to return to where you were. Browsers each implement their history journal and its API in subtly different ways. For example, Internet Explorer 7 required the use of an HTML iframe in order to generate an actual history entry when you navigate to a hashtag. Other browsers didn t update their JavaScript API objects, such as location.hash, to reflect changes to the hashtag. Some other browsers were just plain buggy and didn t consistently keep the correct state. There were other smaller differences in addition to gross API differences. Ever wonder why you need that iframe in the HTML page in a Silverlight project It s there for navigation support in older browsers, including IE7. IE7 wouldn t generate a history entry when you navigated to a hashtag unless you also navigated a frame at the same time. Some pretty clever scripting avoids a server round-trip in there, all happily wrapped inside the navigation API. IE8 doesn t require this hack.
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Back around 2007-2008, Ajax libraries started to include functionality to wrap all this journal ugliness. Happily, Silverlight, with Silverlight 3 in 2009, was able to build on this body of work to provide the same functionality. The entire navigation structure for rich, client-side browser applications is built around hash tags.
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15.1.2 Anchor hashtags
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Hashtags, more properly known as fragments when part of a larger URI, were originally designed to enable navigation within the same page without requiring a round trip to the server. They were for top-level tables of contents on really long pages. Here s an example in HTML:
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Browser navigation background
<ul> <li><a href="#first">First</a></li> <li><a href="#second">Second</a></li> </ul> <p><a style="height:600px" name="first"/> This is the first content paragraph</p> <p><a style="height:600px" name="second"/> This is the second content paragraph. Put me below the fold.</p>
If you paste this into a file with an .html extension and view it in your browser, you ll see how clicking the links at the top brings the bottom content into view and updates the address at the top of the browser. If the content is already in view, you won t see any on-page changes, but you ll still see the hashtag change in the URL. Figure 15.1 illustrates this. You can achieve a similar effect using JavaScript. Rather than having Figure 15.1 I just clicked the First link at the top of to click a link, you can use this one the page. The browser scrolled to bring the content into line of JavaScript code: view and updated the URL with the hashtag #first.
window.location.hash = "#first";
As you learned back in chapter 4, Silverlight can manipulate the browser DOM for any page it s on. Silverlight uses this and the plug-in model to handle the journal manipulation for you, saving you the aggravation of coming up with a cross-platform, crossbrowser, custom solution or hand-crafting JavaScript. The hashtag approach provides a way to uniquely address content. It s common to see, for example, blog engines using this to uniquely address comments on a page. In Ajax applications and in-browser RIAs, you can use it the same way: to uniquely identify content that s on the same browser page, but nested within your application. Assuming you re already on the browser page specified in the URL, all of this is done without a page refresh, which is the key to making it work with your applications.
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