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template.master
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The template.master file provides the template for the .aspx pages within the site. As I mentioned, master pages are a great new feature within .NET 2.0 that allow you to maintain a consistent look throughout a site. The master page follows: <%@ master language="VB" %> <html xmlns="http://www.w3.org/1999/xhtml"> <head runat="server"> <title>XML and Web News</title> <link rel="stylesheet" type="text/css" href="styles.css"> </head> <body> <div style="float:left;"> <img src="images/top.jpg" width="600" height="49" alt=""/> </div>
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CHAPTER 12 CASE STUDY: USING .NET FOR AN XML APPLICATION
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<div style="float:right; margin: 5px;"> <a href="manageNews.aspx">Manage news</a> | <a href="index.aspx">Home</a> </div> <div style="clear: both;"/> <form runat="server"> <asp:ContentPlaceHolder id="PageContent" runat="server"/> </form> </body> </html> The page declares the XHTML tags that structure the page, including the linked CSS stylesheet. It sets up the global page elements in a series of <div> tags. The first <div> element contains the image for the top of the page. The second contains the links to manage news items and to return to the home page. I ve included a third <div> element to clear the floats from the first two elements. The master page also includes a <form> element containing the runat="server" attribute. Within the form is the new ContentPlaceHolder control that identifies areas of content that other .aspx pages will supply.
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styles.css
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The styles.css page contains the presentation styles for the application: body { font-family: Arial, Verdana, sans-serif; font-size: 12px; margin: 0px; } td, input, select, textarea { font-family: Arial, Verdana, sans-serif; font-size: 12px; margin: 10px; } h1, h2, p { margin-left: 15px; } h1 { font-size: 20px; color: #333699; } h2 { font-size: 16px; } h3 { font-size: 14px; margin-left: 30px; } table {
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CHAPTER 12 CASE STUDY: USING .NET FOR AN XML APPLICATION
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margin: 20px; } td { padding: 5px; } .indent { margin-left: 45px; margin-right: 20px; } .emphasis { font-weight: bold; color: #333699; } .error { font-weight: bold; font-size: 14px; color: #FF0000; } This content is self-explanatory, so I won t go through it in any detail.
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index.aspx
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The home page for the application initially displays the RSS feed from the news database. It transforms the feed using an XSLT stylesheet to create XHTML content. The page also allows users to select and display other news feeds. The code for the page follows, and I ll walk through it in detail shortly: <%@ Page Language="VB" MasterPageFile="template.master" %> <%@ import Namespace="System.Xml" %> <script runat="server"> Sub Page_Load(Src As Object, E As EventArgs) showRSS("http://localhost/XML/NET/rss.aspx") End sub Sub showRSS(RSSURL as String) Dim RSSDoc as XmlDocument = new XmlDocument() RSSDoc.PreserveWhitespace = false RSSDOC.load(RSSURL) displayRSS.Document = RSSDoc displayRSS.TransformSource = "rss.xsl" End Sub Sub chooseRSS(sender As Object, e As System.EventArgs) Dim RSSURL as String = RSSList.SelectedItem.Value showRSS(RSSURL) End sub
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CHAPTER 12 CASE STUDY: USING .NET FOR AN XML APPLICATION
Sub showRSS2Feed(sender As Object, e As ImageClickEventArgs) response.redirect ("rss.aspx") End Sub </script> <asp:Content id="homeContent" ContentPlaceHolderID="PageContent" runat="server"> <h1>Welcome to XML and Web news. <asp:ImageButton runat="server" ImageUrl="images/rss2.gif" OnClick="showRSS2Feed"/></h1> <p>You can see our latest news below as well as links to other news feeds.</p> <p><asp:DropDownList id="RSSList" runat="server"> <asp:ListItem value="http://alistapart.com/rss.xml"> A List Apart</asp:ListItem> <asp:ListItem value="http://z.about.com/6/g/webdesign/b/rss2.xml"> About Web Design/HTML articles</asp:ListItem> <asp:ListItem value="http://feeds.computerworld.com/Computerworld/XML/News"> ComputerWorld XML News</asp:ListItem> <asp:ListItem value="http://www-128.ibm.com/developerworks/views/xml/rss/ libraryview.jsp">IBM developerWorks XML Feed</asp:ListItem> <asp:ListItem value="http://feeds.lockergnome.com/rss/web.xml"> LockerGnome</asp:ListItem> <asp:ListItem value="http://p.moreover.com/page o=rss002& c=XML%20and%20metadata%20news">Moreover XML and MetaData News</asp:ListItem> <asp:ListItem value="http://localhost/XML/NET/rss.aspx" selected="True"> XML Browser News</asp:ListItem> </asp:DropDownList> <asp:Button Text="Show" OnClick=" chooseRSS" Runat="Server"/></p> <asp:AccessDataSource id="NewsDS" runat="server" DataSourceMode="DataReader" DataFile="App_Data/news.mdb" SelectCommand="SELECT news.newsTitle, news.newsDescription FROM news ORDER BY news.newsTitle"/> <asp:Xml id="displayRSS" runat="server"/> </asp:Content> I ll work through each section of the code so you can understand the page better. Walking Through index.aspx The page starts with a language and master file declaration. By specifying a master page, the application needs to include a Content control to specify the variable content for the template. The page also imports the System.Xml namespace: <%@ Page Language="VB" MasterPageFile="template.master" %> <%@ import Namespace="System.Xml" %>
CHAPTER 12 CASE STUDY: USING .NET FOR AN XML APPLICATION
It then includes a Page_Load subroutine: Sub Page_Load(Src As Object, E As EventArgs) showRSS("http://localhost/XML/NET/rss.aspx") End sub This subroutine calls the showRSS sub, passing the URL of the local RSS feed. The showRSS subroutine follows: Sub showRSS(RSSURL as String) Dim RSSDoc as XmlDocument = new XmlDocument() RSSDoc.PreserveWhitespace = false RSSDOC.load(RSSURL) displayRSS.Document = RSSDoc displayRSS.TransformSource = "rss.xsl" End Sub The showRSS subroutine starts by creating a new XML document called RSSDoc. It sets the PreserveWhitespace property to false so that extra white space in the RSS feed is ignored. The load method loads the content from the feed specified in the RSSURL variable. When the user initially loads the page, the path to the feed is http://localhost/XML/NET/rss.aspx. You may need to change the path on your own system if you ve set up your application in a different folder on the web server. The content displays in the displayRSS Xml component. The code assigns the RSSDoc XML document to the Document property of this component. It can apply a transformation by assigning the rss.xsl file to the TransformSource property of the displayRSS component. The home page allows users to display content from external RSS 2.0 feeds. The page achieves this with the chooseRSS subroutine: Sub chooseRSS(sender As Object, e As System.EventArgs) Dim RSSURL as String = RSSList.SelectedItem.Value showRSS(RSSURL) End sub This subroutine starts by finding the value of the selected item from the combo box. The value corresponds to the URL of the RSS feed. The code then calls the showRSS subroutine, passing the URL of the selected RSS feed. The script block finishes with the following subroutine: Sub showRSS2Feed(sender As Object, e As ImageClickEventArgs) response.redirect ("rss.aspx") End Sub </script> This subroutine responds to the click of the RSS 2.0 image button. When the user clicks the image button, the page redirects to rss.aspx to show the local RSS feed.
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