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If you want to sort by last name and then by rst name, you don t need to add any special code A shortcut is to select the Participant itself instead of the LastName node The Value property of a group node is the result of concatenating the Value of each child text node under that group Try removing the appropriate code in the sample to see the values of child1 and child2 Remember that text nodes exist between eld nodes as white space to format the XML itself!
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A single XML event handler can be red multiple times during a data source change In the past few examples, we didn t see this behavior because we ve been using string data types Some other data types, however, require the XML data to be decorated in particular ways These so-called decorations require managing hidden XML on the changing element itself to accommodate its behaviors For example, for an integer eld to be blank, the hidden
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attribute node called xsi:nil must be set to true (This is an XML data type requirement to which InfoPath must adhere for an integer eld s data to be considered valid) If the blank integer eld is set to some value (which may or may not be a numerical value), the xsi:nil attribute is removed As a result, any XML events on this integer node are red twice: the rst time for removing xsi:nil, the second for changing the value of the eld itself The order of noti cations in this case, with the sender in parenthesis, is Changing (xsi:nil), Validating (xsi:nil), Changed (xsi:nil), Changing (my:integer), Validating (my:integer), and Changed (my:integer)
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Integer and xsi:nil
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To witness rsthand how xsi:nil is involved in eld changes, you can save a form with a blank integer eld, and then save it again as a different name when it has a value Open the resulting xml le in a text editor such as Notepad to see the xsi:nil decoration You can use the MultipleNoti cations sample (included with the samples for this chapter) for this purpose as well as to explore other concepts involving multiple noti cations
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The MultipleNoti cations sample form, shown in Figure 1513, contains several Text Box controls bound to different data types The String eld is the standard case; it exists only for comparison The Integer, RichText, and DateTime elds all show various forms of multiple noti cations Integer and DateTime are similar in their use of xsi:nil, while RichText is a little different The RichText eld res not only regular change noti cations but also HTML element insertions and deletions For example, underlining in the Rich Text Box control will re an event from an HTML node named u (The <u> tag in HTML represents markup for underlined content) Multiple noti cations may cause your code to run twice or more, depending on the data source change Running code in your XML event handlers many times may not cause any problems You might not even know it s running a few times! But in some cases, running code several times could cause serious problems One of the most common issues is poor performance In our Changed event sample, we used a sorting algorithm to
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Figure 1513: MultipleNotifications sample form in design mode
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shuf e the main data source If there were many items, the algorithm could take a long time to run But without handling multiple noti cations properly, the wait time can double or worse! Can we do anything to handle only the noti cations we care about Let s take another look at the MultipleNoti cations sample to learn about OM that can help us make distinctions between different operations As you ll out the sample MultipleNoti cations form, you ll notice that a message box appears after each change (Figure 1514)
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