USING EXPRESSIONS AND FUNCTIONS in VB.NET

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USING EXPRESSIONS AND FUNCTIONS
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interest quickly. RS solves this issue elegantly by allowing report authors to implement document maps with links to report areas. What is a document map Similar to a book s table of contents, report document maps present an outline of the report data. In the previous example, the product catalog map could organize the product data in categories, subcategories, and products for faster navigation. By the way, this is exactly what the Product Catalog report, which is included in the Reporting Services samples, does. Let s look at an example to showcase the advantages of using document maps. We assume that the AWC management would like to see the company sales quarterly performance for a given period broken out by sales territory and store. Because a sales territory could potentially include many stores, the management has requested that we implement some sort of navigational feature that enables users to find a particular store easily. There are at least two possible implementation approaches: Pass the store name as a parameter. However, this implementation would require regenerating the report for each store needed. Create a document map to organize the sales data in territories and stores. Figure 5.17 shows the Territory Sales by Store with Map report, which includes a data map for easier navigation.
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Figure 5.17 Adding a document map to the Territory Sales by Store report makes it easy for users to view and navigate to a store in any given territory.
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As you can see, the report displays a hierarchical document map on the left side listing territories and stores alphabetically. The user doesn t have to page through the report to find a particular store. Instead, he can expand the document map and locate the store quickly. Implementing document maps Authoring the actual report is nothing we haven t seen so far. We used three regions, one table, and two list regions, to group the data by country, store, and quarter. The table region (tblStoreSales) is nested inside the store list (lstStore), which in turn is nested inside the territory list (lstTerritory). Now comes the fun part. You may think that implementing a document map might require creating new datasets and expressions. Actually, it really can t be simpler. The only thing that we had to do was to associate the Label property of the lstTerritory and lstStore groups to the corresponding document map label, as shown in figure 5.18. To achieve the two-level hierarchy of territory and store, for the Territory list we set the document map label to Fields!Territory.Value, while for the Store list we set it to the Fields!Store.Value. That s all there is to it! RS does the heavy lifting to parse the data recursively and generate the document map when the report is processed. As you ve seen in this section as well as in chapter 4, RS allows you to add a variety of interactive features to your reports, such as a report toolbar, toggled visibility, navigational features, interactive sorting, and document maps. One thing that may not
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Figure 5.18 Implement a document map in your reports by associating the Label property of the group to a document map label.
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be clear is how different export formats impact these features. Let s round out this discussion by looking at some considerations that you need to keep in mind with regard to report rendering.
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REPORT RENDERING CONSIDERATIONS
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The area of functionality that is most impacted by exporting is the report interactive features. Table 5.5 shows the interactive features that are supported for each export format.
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Table 5.5 Feature Report toolbar Toggled visibility Navigational features Document maps Interactive features that are supported for each export format HTML * MHTML Excel Image PDF CSV XML
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