Crystal Reports ® For Visual Studio .NET® Interactivity and Reports in Web Applications Interactivity and Reports in Web Applications Copyright © 2001 Crystal Decisions, Inc. Page 2 © 2003 Crystal Decisions, Inc. Crystal Decisions, Crystal Reports, Crystal Enterprise, Crystal Analysis, Crystal Services, Crystal Care, Crystal Assist, Crystal Applications, Info and Holos are trademarks or registered trademarks of Crystal Decisions, Inc. in the U.S. and/or other countries. All other trademarks or registered trademarks referenced are the property of their respective owners. Version 2.0 Crystal Decisions, Inc. 895 Emerson Street Palo Alto, CA 94301 Interactivity and Reports in Web Applications Copyright © 2001 Crystal Decisions, Inc. Page 3 Interactivity and Reports in Web Applications Introduction You can use the Integrated Development Environment (IDE) in Visual Studio .NET to create interactivity in your application that hosts Crystal reports. In this walkthrough, you will create a Web application using Active Server Pages.NET (ASP.NET) in Visual Studio .NET. The Web application contains two Web Form controls: an image and a Web Forms Viewer. It supports interactivity between the user and the Web Forms Viewer, and interactivity between the Web Forms Viewer and the image control. For more information and updates, please visit our Web site at: http://www.crystaldecisions.com/net. Interactivity and Reports in Web Applications Copyright © 2001 Crystal Decisions, Inc. Page 4 Outline of the Web Application The Web application will contain these controls: · a Web Forms Viewer control hosting a report containing a group tree and three charts (which will be referred to as Chart A, Chart B and Chart C). Users can traverse the group tree and drill down on Chart A to select a country. · an image control that will display a flag corresponding to the country the user has chosen from Chart A. The Chain of Interactions 1. The user selects a country through the Web Forms Viewer control by drilling down in Chart A of the report. 2. The Web Forms Viewer updates its display of the report based on the selected country. 3. The image control accepts the chosen country and displays the corresponding flag for that country. Supporting Files The following report and image files have been provided with this walkthrough: · Sales By Country.rpt · USA.jpg · England.jpg · France.jpg · Germany.jpg · Italy.jpg · Others.jpg They are available for download from our Web site as supporting files at: http://www.crystaldecisions.com/net. Create the folder "WalkthroughFiles" under the directory c:\Inetpub\wwwroot. Copy or download the report and image files to this folder. The following sections explain how to construct the Web application described above, and how to navigate in Sales By Country.rpt in a Web Forms Viewer. Interactivity and Reports in Web Applications Copyright © 2001 Crystal Decisions, Inc. Page 5 Creating the Web application Below, you will create a Visual C# Web application that has a Web Forms Viewer hosting Sales By Country.rpt, and an image control displaying the flag of the country the user has chosen through the report. Sales By Country.rpt assumes that the sample database, xtreme.mdb, has been installed on C:\Program Files\Microsoft Visual Studio .NET\Crystal Reports\Samples\Database during setup for Visual Studio .NET. To change the location of xtreme.mdb If you have installed xtreme.mdb at a location other than the default (i.e., C:\Program Files\Microsoft Visual Studio 7\Crystal Reports\Samples\Database), you should do a Set Location for Sales By Country.rpt. To do a Set Location: 1. In Visual Studio .NET, select File | Open |File. This invokes the Open File dialog box. 2. In the Open File dialog box, browse to the location c:\Inetpub\wwwroot\ WalkthroughFiles, and specify the file Sales By Country.rpt. This opens Sales By Country.rpt in the Crystal Report Designer. NOTE If the Crystal Decisions Registration Wizard appears, you can choose to register the Crystal Report Designer at this point or at a later time. 3. In the Crystal Report Designer, right-click in a report area. Choose Database | Set Location. This invokes the Set Location dialog box. 4. In the Set Location dialog box, click the down-arrow under Current Data Source. Select the data source assumed by Sales By Country.rpt, C:\Program Files\Microsoft Visual Studio .NET\Crystal Reports\Samples\Database\xtreme.mdb. You will point this assumed location to the actual location of the database. 5. You may use any one of these database technologies to connect the report to the actual data source: OLE DB (ADO), ODBC (RDO), Database Files (i.e., using native drivers), or ADO.NET (XML) (which is under More Data Sources). For the purpose of this walkthrough, under Replace with, double-click OLE DB (ADO). This invokes the OLE DB (ADO) dialog box. NOTE If you are already connected to xtreme.mdb, proceed with step 9. Or, if you are connected to another database through OLE DB (ADO), select Make New Connection. 6. In the OLE DB (ADO) dialog box, highlight the OLD DB provider, Microsoft Jet 4.0 OLEDB Provider. Then click the Next button. 7. Provide the necessary information to access the actual data source: for Database Name, click the square button adjacent to the entry box. Select xtreme.mdb according to where you have installed it. Click Next. 8. Update any advanced information for your data source, if necessary. Then click Finish. You will be returned to the Set Location dialog box. 9. Redirect the report to look for the database in the actual location: in the Set Location dialog box, under Replace with, highlight the actual location of the database. Click Replace. You will find this location updated under Current Data Source. Then click Close. Interactivity and Reports in Web Applications Copyright © 2001 Crystal Decisions, Inc. Page 6 10. If you have modified fields in xtreme.mdb, right-click in a report area, point to Database and select Verify Database. A message titled Verify Database suggests you to proceed to fix up the report. Click OK to fix up unmapped fields in the database. 11. Choose File | Save Sales By Country.rpt to save the report with the updated database location. Creating a Web Form You will create a Visual C# Web application project, WebFormExample, on the local host http://localhost. 1. In Visual Studio .NET, select File | New | Project. This invokes the New Project dialog box. 2. In the New Project dialog box, select Visual C# Projects in the left pane. 3. Select ASP.NET Web Application in the right pane. You may choose to create your project on any Web server of your choice. For the purpose of this example, you will create the project in the default project location, http://localhost, which is the local IIS Web server. 4. Enter "WebFormExample" in the Location field after http://localhost/. The default project location, http://localhost, is displayed in the Location field. Click OK. This creates the Web application project, WebFormExample, at http://localhost/WebFormExample. Visual Studio creates a Web Forms page (with the default name "WebForm1.aspx") in the project WebFormExample. The window for the Web Forms page consists of two tabs: Design and HTML. The Design tab allows programming using the Visual Studio IDE. The HTML tab contains the HTML source that supports ASP.NET. Visual Studio automatically opens the Design tab of WebForm1.aspx. Interactivity and Reports in Web Applications Copyright © 2001 Crystal Decisions, Inc. Page 7 TIP In Visual Studio .NET, you can anchor the Toolbox by clicking the "pin" icon at the top-right corner of the Toolbox. Also, items in a Toolbox tab can be displayed alphabetically by right-clicking the tab, and selecting Sort Items Alphabetically from the shortcut menu. When you are in the Design tab, the Toolbox lists the Web Form controls. The Web Forms tab of the Toolbox displays all Web Form controls including the Web Forms Viewer. Interactivity and Reports in Web Applications Copyright © 2001 Crystal Decisions, Inc. Page 8 Inserting the Web Form Controls With the Toolbox set up properly, you can now insert Web Form controls into your Web Form. Select the Design tab of WebForm1.aspx if it is not already the active tab. You will insert two controls, an image and a Web Forms Viewer: 1. From the Web Forms tab of the Toolbox, drag the Image control and drop it into the Web Form. The image object has a default name Image1. 2. Similarly, drag a Web Forms Viewer control and drop it into the Web Form. The Viewer has a default name CrystalReportViewer1. Web Forms Viewer control Image control Interactivity and Reports in Web Applications Copyright © 2001 Crystal Decisions, Inc. Page 9 Binding Files to the Web Forms Controls Next, you will specify the image and report files that the Web Form will display. Initialize the image control with a United Nations flag since initially, no country has been chosen. Later in the section "Linking Up the Web Form Controls for Interactivity", you will further specify which flag the image control should display under what conditions. To specify an image file for the image control: 1. In the Design tab of WebForm1.aspx, select the image control. The Properties window automatically displays the properties applicable to the image control. You may click the Alphabetize icon to arrange properties in their alphabetical order. 2. Scroll down to the property, ImageUrl, in the Properties window. Specify a URL or full path name for the image file that you would like the image control to display. Specify the URL http://localhost/WalkthroughFiles/Others.jpg. This initializes the image control to display the flag for the United Nations. 3. You may adjust the length and the width of the image control to display the flag in the appropriate scale. To specify a report file for the Web Forms Viewer control 1. In the Design tab of WebForm1.aspx, select the Web Forms Viewer control. The Properties window automatically displays the properties applicable to it. 2. Select DataBindings in the Properties window, and click the square button to the right of the entry field. This opens the DataBindings dialog box. 3. In the DataBindings dialog box, select ReportSource under Bindable Properties, and enter the full path name, "C:\\Inetpub\\wwwroot\\WalkthroughFiles\\Sales By Country.rpt" (with the double quotes) under Custom binding expression. The Web Forms Viewer control automatically displays this report at design time. Specify image to display. Interactivity and Reports in Web Applications Copyright © 2001 Crystal Decisions, Inc. Page 10 4. Highlight WebForm1.aspx in the Solution Explorer and click the View Code icon. In WebForm1.aspx.cs, after the call to base.OnInit(e) in OnInit, enter this line: DataBind(); 5. You may adjust the size of the Web Forms Viewer control as you see fit, by first setting the property, BestFitPage, to False, and then adjusting handles of the Viewer in the Design tab. Select the ReportSource property under Bindable Properties. Specify a full path name for the report file. Interactivity and Reports in Web Applications Copyright © 2001 Crystal Decisions, Inc. Page 11 Below shows a layout of the Web Form in the Visual Studio editor, with the image and Web Forms Viewer controls initialized. Linking Up the Web Form Controls for Interactivity As described in the section "Outline of Web Application" above, when the user drills down on a country (or a group of countries for "Others") in Chart A in the report, the image control should display the appropriate flag. To set up the image control to display the appropriate image upon a drill-down event in the Web Forms Viewer, you can implement the following: 1. In the Design tab of WebForm1.aspx, select the Web Forms Viewer control. 2. In the Properties window, click the Events icon. The Properties window automatically displays all the events applicable to the Web Forms Viewer control. If you have not already done so, you may click the Alphabetize icon to arrange events in their alphabetical order. 3. Double-click the Drill event. This activates the editor for WebForm1.cs, and initializes a function named CrystalReportViewer1_Drill. 4. Add the following lines of code to CrystalReportViewer1_Drill: string sGroupName = ""; if (e.NewGroupLevel == 1) { Interactivity and Reports in Web Applications Copyright © 2001 Crystal Decisions, Inc. Page 12 sGroupName = e.NewGroupName; string imageURL = string.Format ("http://localhost//WalkthroughFiles//{0}.jpg", sGroupName); Image1.ImageUrl = imageURL; } Building and Running the Web application To build and run the Web application: 1. From the Visual Studio .NET Menu Bar, select File | Save All to save all changes you have made to the project WebFormExample. The first time you save the solution file, you will be prompted with a message about saving WebFormExample.sln. Save it to the default location c:\Inetpub\wwwroot\WebFormExample. 2. Select Build | Build to compile your application. 3. Select Start Without Debugging from the Debug menu. 4. The Web application automatically starts at http://localhost/WebFormExample/WebForm1.aspx in your browser. 5. Try drilling down on a country in Chart A of Sales By Country.rpt. For instance, drill down on USA. The image control displays the flag of the United States. The report also displays Chart B showing the sum of last year's sales for the top 5 regions in the United States. Interactivity and Reports in Web Applications Copyright © 2001 Crystal Decisions, Inc. Page 13 Navigating in the Crystal Report Sales By Country.rpt is grouped by the four fields - country, region, city and customer name. It contains a group tree and charts A, B and C. You can select a grouping via the group tree. You can also select a country grouping through Chart A. Drilling Down in the Crystal Report Initially, to select a grouping via the group tree, expand the group tree by clicking on the '+' symbol to the left of a country node. You can then click a region, city, or customer name. The report will then display the sum of last year's sales for the selected grouping. You can also select a country grouping by drilling down on Chart A. Chart A is a group chart displaying the sum of last year's sales for each of the top 5 countries, and the total of last year's sales for the rest of the countries. The user may drill down (by clicking) on Chart A to select one of the top 5 countries (or "Others" for all other countries), and view in Chart B the sum of last year's sales for each of the top 5 regions in that country (or group of countries in the case of "Others"). You can expand and traverse the group tree to select a grouping. Or, you can select a country in Chart A by drilling down on it. Interactivity and Reports in Web Applications Copyright © 2001 Crystal Decisions, Inc. Page 14 Interactivity and Reports in Web Applications Copyright © 2001 Crystal Decisions, Inc. Page 15 For instance, to view the sum of last year's sales for the top 5 regions in Italy, you can drill down on "Italy" in Chart A. In this database, since there are only 3 regions in Italy (i.e., Lombardia, Piedmonte and Lazio) with sales, only the sum of last year's sales of each of these 3 regions will be displayed in Chart B. Click on a region or expand the group tree to select a city or customer. Chart B displays the sum of last year's sales in the top regions of the country selected in Chart A. Interactivity and Reports in Web Applications Copyright © 2001 Crystal Decisions, Inc. Page 16 At this point, you may click a region in the group tree, or further expand the group tree to select a city or customer to display the corresponding sales. For instance, you can click the region, Lombardia, in the group tree. The report will display in Chart C the sum of last year's sales of the two cities in Lombardia, Bergamo and Milan. Clicking a region will display the sales of each city in that region. Interactivity and Reports in Web Applications Copyright © 2001 Crystal Decisions, Inc. Page 17 You may further expand the group tree and select a city or customer name to display the corresponding sales for that city or customer. For example, if you click the city Milan, the report will show the sales for each customer in Milan; in this database, since there is only one customer, Milano Bike Store, in Milan, the report will only show the sales for that customer. Note that at any point, you can click the up-arrow icon in the Web Forms Viewer toolbar to traverse one level up in the group tree. Clicking on a city in the group tree will show sales of each customer in that city. You can click the up-arrow icon anytime to traverse one level up in the group tree. 
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