Figure 1525: Main data source for the MOI Consulting request form template in Visual Studio .NET

Generator Quick Response Code in Visual Studio .NET Figure 1525: Main data source for the MOI Consulting request form template
Figure 1525: Main data source for the MOI Consulting request form template
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Figure 1525 shows the main data source for the MOI Consulting request form template
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The next major step after getting most of the data source in place is to add logic to our form We could implement all of our form s logic by just writing code, but that s not the best approach You might not expect us to recommend this (especially in this chapter), but you should consider using rules before form code when adding logic Form code not only takes longer for you to implement but also is more dif cult to maintain It is prone to errors and security aws, despite how good we think we are at programming Rules, on the other hand, can be maintained by almost anyone and have been well tested for use in countless situations Moreover, rules are declaratively de ned as part of the form de nition, so there is neither code to compile nor an assembly to build
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15: Writing Code in InfoPath
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Here is a sampling of the rules used in the MOI Consulting request form When ContactMe is changed, set Now to false When Now is checked, set PreferredDate to now() plus ve minutes When RequestType is SensitiveCritical, set ContactMe to yes Clicking the What s this Button control on the Welcome view shows a dialog box message Clicking the Next or Back Button controls takes the user to the next view or the previous view, respectively As you can see, rules de ne an if X then do Y behavior that can easily replace a few lines of form code Rules can also have multiple conditions and multiple actions that may be tedious to implement using code Writing the code isn t the only burden there s also the need to handle special cases, for example, whether a eld node exists or is just empty If you re skeptical that rules save time and energy, we leave it as an exercise for you to reimplement all rules as form code in the MOI request form More logic that we can t forget to add to our form involves data validation and conditional formatting Using InfoPath s built-in pattern builder to de ne data validation constraints basically defeats the purpose of doing any basic regular expression matching in the Validating event handler We also use extensive data validation on the PreferredDate eld; errors will be reported under any of these conditions: If ContactMe is yes and PreferredDate is blank If PreferredDate is within an hour of now and RequestType is not SensitiveCritical and ContactMe is yes If PreferredDate is less than ve minutes from now and ContactMe is yes Conditional formatting in this sample form makes controls read-only or hidden under certain conditions in the data For example, we use conditional formatting to hide the OtherType Text Box when RequestType is not set to Other Condition disabling is used for both the Please contact me (bound to eld ContactMe) Option Button controls as well as the PhoneNumber and PreferredDate elds under certain circumstances We didn t conditionally
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disable the click here Button control, but we could have done so by checking some eld (perhaps enableClickHere) in the data source that does not exist in the view In the right circumstances, we could set this eld to a speci c value through form code, which would allow the user to click the Button control We won t take this approach because we believe that having a disabled control would frustrate users Keeping the Button control enabled might tempt some users to click it too early, but we offer feedback (in this case) through data validation That s where we show the error dialog shown earlier in Figure 1519
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