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Perhaps the most famous example of up-selling Would you like to super-size that is mentioned to customers when they order a value meal at McDonalds This seemingly innocent request greatly increases the profit margin Cross-Selling: Cross-selling is defined as the practice of offering customers complementary products Continuing with the McDonalds analogy, you ll always hear the phrase Would you like fries with that when someone orders a hamburger Because it s widely acknowledged that fries go with burgers, and the consumer is ordering a burger, then its likely that the consumer also likes french fries the mere mention of french fries is likely to generate a new sale Featured products on the home page: HatShop already permits the site administrator to choose the products featured on the main page and on the department pages In this chapter, you ll implement a dynamic recommendations system with both up-selling and cross-selling strategies.

ArrayList<Integer> selections = new ArrayList<Integer>(); selections.add(0); Creates selections.add(2); multiple text.setChoiceSelections(selections); select list PdfFormField field = text.getListField(); boxes writer.addAnnotation(field); break; case 3: text.setBorderColor(BaseColor.RED); text.setBackgroundColor(BaseColor.GRAY); text.setChoices(LANGUAGES); Creates combo box text.setChoiceExports(EXPORTVALUES); text.setChoiceSelection(4); writer.addAnnotation(text.getComboField()); break; case 4: text.setChoices(LANGUAGES); Creates editable text.setOptions(TextField.EDIT); combo box writer.addAnnotation(text.getComboField()); break; }

Caution Use the PivotTable command. Do not click the Table command and create an Excel table, or you

} catch(IOException ioe) { throw new ExceptionConverter(ioe); } catch(DocumentException de) { throw new ExceptionConverter(de); }

This system has the advantage of not needing manual maintenance Because at this point HatShop retains what products were sold, you will implement a customers who bought this product also bought feature in this chapter..

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Observe that you re using the TextField convenience class once again. This is an iText design decision, based on the fact that drawing the appearance of a list or combo box isn t all that different from drawing the appearance of a text box. Instead of using getTextField() to obtain a PdfFormField instance, you now have to use the methods getListField() or getComboField(). You can use the same methods to set properties as you used for the text field widgets. The values that are shown to the end user are set with the method setChoices(). In listing 8.12, the LANGUAGES array consists of five languages. In B and D, you use setExportValues(), passing the EXPORTVALUES array. That array looks like this:

String[] EXPORTVALUES = { "EN", "DE", "FR", "ES", "NL" };

After the file has been closed and reopened, it is in Excel 2007 format, and [Compatibility Mode] has disappeared from the title bar. The pivot tables will have full functionality, with all the Excel 2007 features available.

In HatShop, you ll implement the dynamic recommendations system in the visitor s shopping cart and in the product details page. After adding the new bits to your shop, the product details page will contain the product recommendations list at the bottom of the page, as shown in Figure 10-1.

Every export value has to correspond with an option in the choice array. When the form is submitted to a server, the export value will be used. For instance, if the end user selects "English" and submits the form, the corresponding export value "EN" will be submitted. Note that these export values aren t used when you preselect an option the setChoiceSelection() method expects an int. For multiple select lists, you can also use the setChoiceSelections() method with a list of integers. You don t define export values in C and E; in this case, the full language name will be sent to the server. In E, you set the EDIT flag, so the end user filling out the form can even add languages that aren t present in the LANGUAGES array. Now let s find out how to manipulate the values of the choices in an existing PDF document.

Let s take the PDF you created in section 8.4.1 and pretend that you forgot which options and export values are available in the choice fields of the form. How could you retrieve those values And how would you change the selection

Figure 10-1. The product details page with the dynamic recommendations system implemented The shopping cart page gets a similar addition, as shown in Figure 10-2.

Listing 8.13 ChoiceFields.java (continued)