Working with the user s browser window in Visual Basic .NET

Painting QR-Code in Visual Basic .NET Working with the user s browser window

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Working with the user s browser window
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Accessing the query string One common approach for managing state in a web application involves using the query string. The query string empowers you to store small amounts of data relevant to a user s session. In addition, the query string can be used as a sort of a bookmark to allow a user to come back to a specific location at a later point in time. As an example, let s pretend we want to send you the search results for a query on Silverlight; we could email you the following web address:
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http://search.msn.com/results.aspx q=Silverlight&mkt=en-us&FORM=LVCP
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This web address enables you to see the search results we re referring to. This is more convenient than telling someone to go to a search engine, enter Silverlight into the query box, and wait for the results. This simpler approach is made possible through the values that are stored after the (question mark) values that represent the QueryString of the Uri for an HtmlDocument. The QueryString is readable through a collection of key/value pairs. This collection is part of a larger entity known as the DocumentUri. The DocumentUri represents the Uri of the current page, allowing you to always gain your current bearings within an application. Figure 4.3 shows how the parts of the DocumentUri are related. This figure shows the breakdown of DocumentUri a web address. Note that, significantly, the QueryString starts after the in a web address. In addition, each key/ http://www.silverlightinaction.com page=1&id=1234 value pair is separated by an & (ampersand). The QueryString in figure 4.3 QueryString has two key/value pairs, which could Figure 4.3 The elements of a web address be read using this code:
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HtmlWindow window = HtmlPage.Window; HtmlDocument document = HtmlPage.Document; foreach (string key in document.QueryString.Keys) { window.Alert("Key: " + key + "; Value: " + document.QueryString[key]); }
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Note that you can t set the key/value pairs of this collection from code. Instead, if you need to set the QueryString values, you ll need to use the navigation techniques shown table 4.6. This will reset the values associated with the QueryString, as well as the contents of the page. Once the contents of the page are loaded, you can use the HtmlDocument to navigate the page.
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Working with the user s browser window
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The hosting browser window is represented as an HtmlWindow object. This object can t be instantiated from code, but you can get the current instance of the hosting browser s HtmlWindow through the HtmlPage class s Window property. This can be accomplished by using the following code:
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HtmlWindow window = HtmlPage.Window;
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Integrating with the browser
Once you have a handle to it, you can use the HtmlWindow to display prompts to a user. Alternatively, you can use this object to navigate the browser to a different location using the Navigate method. Either way, this browser window stores valuable information that can be discovered and used to enhance the user s experience.
Prompting the user
The HtmlWindow class enables you to deliver HTML prompts to your users. It s important to note that these prompts aren t Silverlight items. Instead, these prompts are constructed entirely by the user s browser window, so you have a limited ability to customize how these prompts are displayed. The good news is that these prompts provide a quick way to show or collect information from your users. The three prompt options available through the HtmlWindow class are listed in table 4.5.
Table 4.5 The prompt options available through the HtmlWindow class Description It shows a single message in an HTML alert window. It prompts the user to agree or disagree with a statement or question. This prompt displays two buttons: OK and Cancel. The text of these buttons can t be customized. If a user selects OK, this method will return true; if a user selects Cancel, this method will return false. It creates a dialog window that displays a single message. In addition, this dialog displays a single text box that the user can enter information into. If the user selects the OK button from this dialog window, the value of that text box will be returned as a string. Otherwise, if a user selects Cancel or exits the window, null will be returned.
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