8: Submitting Form Data in VS .NET

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8: Submitting Form Data
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Figure 814: Student sign-in form during preview
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Figure 815: Dialog confirming that submit succeeded
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source may not be allowed to be blank, and you may want to perform further validation on the input data In our simple sign-in form, for example, we may want to connect to the student database and verify that the student ID and name actually exist Moreover, it would also be logical to validate that the ID is associated with that student name A exible way to implement these checks would be to use a Web service that can read from the database using ADONET (Refer to 7 for more about ADONET with Web services) The Web service could accept the necessary input parameters, read and check the data from the database, and nally return a Boolean true if a match is made, false otherwise
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Submitting Forms
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Your form could have data validation to check that the Web service does return true If the value is false, a validation error will occur and the form will not be allowed to be submitted until the error is remedied
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Partial Submit
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It s utopian to think that students will all be signed in before class starts The reality is that many students (who always seem to be the same students!) are late We want to track who is late, and how late, for each class To implement this mechanism into our form, we ll want to include a view where the instructor can enter class information, including the start time We ll add some logic to our existing form so that if the student submits the form after the class start time, we ll ask why he or she is late The time checking will happen in InfoPath, not the Web service, so we don t need to count on a submit method to do the validation for us But Web services will be used to query GetLateReasons and submit to AddLateReason, as shown earlier in Figure 811 (The sample form template is called StudentSignIn2)
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If the submit Web service was sent the class date and time as one of its parameters, it (instead of InfoPath) could figure out whether the student s sign-in is tardy by comparing against the current date and time However, since we don t receive data from submit, we d need to force submit to fail somehow Recall that InfoPath uses the HTTP return status code to determine whether or not the submit was successful One of the few ways to get the Web service to return a non-200-series status is by explicitly failing in the Web service code For example, the Web service could throw an exception in a specific case ASPNET then sets the HTTP status to some value in the 500 range (typically 500), which means an Internal Server Error happened
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We start by creating another view that holds class information To add class information to our data source, let s add a group called ClassInformation and add child elds to hold the data The controls we insert into
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8: Submitting Form Data
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the Class Information view are editable by default This view should be used only by the instructor (In 13, you ll learn how to use roles with work ow, which enables this scenario) On the Student Sign-In main view, we want to show the class data as read-only That way a student cannot modify it during sign-in Figure 816 shows our new view and the updated data source
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Settings for Data Formatting
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The start date and start time in the Class Information view are bound to the same data source eld To separate the date from the time for a single piece of data, we used data formatting to lter the data The entry point to formatting data types, such as Integer and DateTime, is the Format button on the control s properties dialog
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