15: Writing Code in InfoPath in .NET

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15: Writing Code in InfoPath
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Figure 1530: Finding the xmlToEdit and ActionType capability of a structurally editable control
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The code snippet in Listing 1537 shows how we use ExecuteAction() to insert the Optional Section if it does not already exist in the data source
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Listing 1537: Using ExecuteAction to Insert an Optional Section
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public void Add_Additional_Details_Clicked( object sender, ClickedEventArgs e) { // Is AdditionalDetails already inserted XPathNavigator root = MainDataSourceCreateNavigator(); XPathNavigator additionalDetails = rootSelectSingleNode( "/my:Request/my:RequestDetails/my:AdditionalDetails", NamespaceManager); // If it doesn t exist, we ll insert it if (additionalDetails == null) // XmlToEdit for xOptional: AdditionalDetailsSection_2 thisCurrentViewExecuteAction( ActionTypeXOptionalInsert, "AdditionalDetailsSection_2"); // If it already exists, insert an AdditionalDetail else // Bulleted List doesn t support ExecuteAction since // there s no XmlToEdit
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// We ll insert it using the data source instead additionalDetailsAppendChildElement( additionalDetailsPre x, "AdditionalDetail", additionalDetailsNamespaceURI, stringEmpty); }
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If the Optional Section control, bound to AdditionalDetails, already exists, the Button control will insert an AdditionalDetail node Adding this node to the data source will, in turn, add an item to the Bulleted List control Since the AdditionalDetail repeating eld is a child of the AdditionalDetails group and we already have a reference to AdditionalDetails, we can easily use the XPathNavigator method AppendChildElement The AppendChildElement method creates a new data source node and adds it to the end of children nodes relative to the context (AdditionalDetails) XPathNavigator If you wanted to assign a value to the newly inserted item, you could pass it instead of the empty string as the last argument to AppendChildElement
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Using the XPathNavigator s AppendChildElement Method
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AppendChildElement requires the namespace pre x and URI as
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parameters Since the node in which we re appending has the same pre x and URI, we can just reference their values This lessens the chance of mistyping and is more robust if, say, the namespace or pre x change
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After the user completes the Request Details view, the read-only Con rm view (refer back to Figure 1523) displays a summary of gathered form data Of the three Button controls at the bottom of the view (Start Over, Go Back, and Submit), we haven t yet discussed Submit As its name implies, clicking this control submits the form You learned all about submitting forms in 8, but the MOI request form does not implement a traditional-style submit to a data connection Instead, via the Submit Options dialog shown in Figure 1531, we have chosen to submit using our own code Clicking on the Edit Code button in this dialog opens VSTA, hooks up the event in InternalStartup, and creates the event handler method called FormEvents_Submit
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Figure 1531: Setting up the form s main submit to use code
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The MOI request form de nes the Submit event as saving the form to the user s computer Listing 1538 shows the implementation for Submit Before doing the save, however, we want to check whether the current form was recovered We can detect a recovered form by checking the thisRecovered Boolean ag A form s data is recovered if InfoPath suddenly and unexpectedly closed while the form was being lled out This could happen, for example, if the computer turned off due to a power outage Because InfoPath quit unexpectedly, the form could be in an indeterminate state We d rather be safe and ask the user if he or she wants to continue submitting recovered data The user may choose to go back and nish lling out parts of the form that weren t completed
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Listing 1538: Sinking the Submit Form Event
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public void FormEvents_Submit(object sender, SubmitEventArgs e) { // NOTE: There are no errors if InfoPath allows submit to happen // If this is recovered data, ask the user if we should continue DialogResult result = DialogResultYes; if (thisRecovered) result = MessageBoxShow("This data is recovered " + "Still continue ", "Submitting Recovered Data", MessageBoxButtonsYesNo); if (result == DialogResultYes)
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{ // Save the form string tempFileName = SystemIOPathGetTempFileName() + "xml"; thisSaveAs(tempFileName); // Fills a link to see where it saved XPathNavigator root = MainDataSourceCreateNavigator(); XPathNavigator savedFileLocation = rootSelectSingleNode( "/my:Request/@my:SavedFileLocation", NamespaceManager); savedFileLocationSetValue(tempFileName); // Go to the Thank You view ViewInfosSwitchView("ThankYou"); } else { eCancelableArgsCancel = true; eCancelableArgsMessage = "Submit was canceled"; eCancelableArgsMessageDetails = "Submit again whenever you are ready"; } }
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