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First, decoupling data containers from navigators, and navigators from iterators, represents a good bargain from the software standpoint. The ultimate reason for keeping the navigation and the iteration API distinct, however, is that in this way the results of any XPath query can be easily accessed and processed from different programming environments XML DOM, XPath, and, last but not least, XSLT. The XPathNodeIterator Class The XPathNodeIterator class has no public constructor and can be created only by the parent navigator object. The iterator provides forward-only access to the nodes selected by XPath query. Callers use the iterator's methods and properties to access all the nodes included in the node-set. Figure 6-7 illustrates the relationship between callers, navigators, and iterators. A caller passes an XPath expression. The navigator executes the command and gets a node-set. The caller then receives an iterator object to access the members of the node-set. Current, Count, and MoveNext are the key members of the iterator's programming interface.

The Spreadsheet component inserts a spreadsheet where users can add formulas, sort and filter data, and format the worksheet. Use the Spreadsheet component to present unsummarized data. The Chart component is linked to data in the Spreadsheet component, so that the chart can display changes when the data in the spreadsheet changes. The PivotTable component lets users analyze database information using most of the sorting, filtering, grouping, and subtotaling features of PivotTable reports. There s a fourth component that works in the background: the Data Source component, the data retriever for the PivotTable and Chart components. Figure 6-6 shows an interactive web page using the PivotTable component. The toolbar at the top of the pivot table allows the user to sort, filter, show or hide the field list, and export the table to Excel for offline use.

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Figure 6-7: The relationship between callers, navigators, and iterators. Properties of the Iterator Object Table 6-10 summarizes the properties exposed by the XPathNodeIterator class. Table 6-10: Properties of the XPathNodeIterator Class Property Description Count Returns the number of elements in the node-set. This value refers to the top-level nodes and does not consider child nodes. Current Returns a reference to a navigator object rooted in the 233

The Office Web Components (OWCs) are a set of ActiveX components. With the components, you don t need to learn Java to create the slick interactive interface your users are asking for. The OWCs are supported by Excel and Access 2000, 2002, and 2003; they rely on Internet Explorer, starting with version 5.01 with SP2 or higher. The OWCs are only interactive if the user s browser supports ActiveX components. If users have an older browser, they ll still see the spreadsheet, chart, or pivot table, but they won t be able to manipulate it in their browser. The OWCs have two other requirements: your users must have a Microsoft Office license to use the components, and the OWCs must be installed on your SharePoint server. (To download the components, go to http://www.microsoft.com/downloads and search for owc11.exe.) The Office licensing and browser requirements make the OWCs a better choice for an intranet, where they were intended to be used, rather than the Internet. By default, IE blocks unsigned ActiveX components. When you or your users open a web page that includes ActiveX components, you ll need to click the Information Bar that appears at the top of your browser window and choose Allow Blocked Content. Depending on your settings, you might also have to okay one or two message boxes as part of this process. Don t let this IE behavior dissuade you from using the OWCs (or encourage you to dumb down your browser security settings). The active content won t be blocked when you view the web pages as part of a SharePoint site. SharePoint is wall-to-wall trusted ActiveX web parts.

Table 6-10: Properties of the XPathNodeIterator Class Property Description iterator's current node CurrentPosition Gets the index of the currently selected node The Current property is the key property for callers to drill down into the structure of the selected node In the XPath Evaluator sample application we discussed earlier in this chapter, at a certain point we had to examine the subtree of each node included in the node-set The code in Figure 6-4 uses a recursive routine (named LoopThroughChildren) to navigate the subtree of a given node The navigator/iterator pair makes that task quite straightforward to accomplish The Current property already returns a reference to the XPathNavigator object rooted in the currently selected node Pay attention to the fact that what you get is not a copy of the navigator but a simple reference.

If you need to dig into the node structure, make a deep copy of the navigator first For the purpose, you can use the navigator's Clone method Methods of the Iterator Object Table 6-11 lists the public methods of an iterator object Table 6-11: Methods of the XPathNodeIterator Class Method Description Makes a deep copy of the current XPathNodeIterator object Clone MoveNext Moves to the next node in the navigator's selected node-set When MoveNext is called, the iterator adjusts some internal pointers and refreshes its Current and CurrentPosition properties When the iterator is first returned to the caller, there is no currently selected node Only after the first call to MoveNext does the Current property point to a valid navigator object Visiting the Selected Nodes Let's review the typical way in which an XPath iterator works.

When you re applying styles to your document, you have several tools that will help you. First, there is the Styles and Formatting task pane. To open it, click View Task Pane (or press Ctrl+F1). The task pane will appear in the right side of the Word window. Click the arrow at the top of the task pane and select Styles and Formatting. To open the Styles and Formatting task pane faster, simply click the Styles and Formatting button on the Formatting toolbar. The Styles and Formatting task pane, which you can see in Figure 8-12, provides an easy way to create and apply styles. Once you select the portion of your document you would like to format, simply click a style in the task pane. Conveniently, the task pane identifies the section s current style.

To create an interactive page, follow these steps: 1. Open the workbook that contains the sheet. 2. Remember to remove protection from protected workbooks, sheets, or ranges in the workbook, even if the protection doesn t apply to the sheet or selection you wish to publish. If Excel trips over password protection in your workbook, you ll see this message box, and will need to remove protection and begin the Save process again.

Suppose that you just executed an XPath command using an XPathNavigator object, as shown here: XPathDocument doc = new XPathDocument(fileName); XPathNavigator nav = docCreateNavigator(); XPathNodeIterator iterator = navSelect(expr); To visit all the selected nodes, you set up a loop controlled by the iterator's MoveNext method, as follows: while (iteratorMoveNext()) { XPathNavigator nav2 = iteratorCurrentClone(); } In real-world applications, you need to drill down into the subtree of each node referenced in the XPath node-set You should not use the navigator returned by the Current property to move away from the node-set Instead, you should clone the object 234.

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