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Figure 67: Final page of the Data Connection Wizard for an XML file
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or existing), but before the form is shown This is convenient for external data that never changes, such as a list of states used in a Drop-Down List Box (We ll go into details when talking about List Box controls using data from secondary data sources in 7) If you do not want the data to be queried automatically, which is the behavior we want in our sample form, you can query it on demand through a rule We will set up a rule to query the XML le using this data connection in a moment Click Finish to complete the creation of the data connection
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Checking the Automatically retrieve data when form is opened checkbox shown in Figure 67 does not mean you cannot requery this data connection later You can requery (also known as refresh) the data via a rule, for example, at any time
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6: Retrieving Data from External Source s
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Figure 68: Data Connections dialog after finishing the XML file Data Connection Wizard
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After clicking Finish, you can see the data connection we just created in the Data Connections dialog (Figure 68) The Details region shows the major settings for the connection The Details region is helpful when you have many data connections listed and can t quite recall their speci cs You ll also notice that this dialog is the general entry point for con guring query data connections for both main and secondary data sources You can add, modify, and remove connections from this dialog However, if a main data source connection exists, it cannot be removed We will nd out why when we look at submit database connections in 8 Now that we ve created the XML le secondary data connection, let s design the visual aspects of our form template and see how to use the XML le data At rst, you ll notice nothing has visually changed in the form Since a data connection is not visually represented, you might forget that
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Figure 69: Data Source task pane showing secondary data source
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it s even there! Obviously, one way to tell is to go back to the Data Connections dialog Instead, let s go to the Data Source task pane (Figure 69) The Data source drop-down menu will have a new item, namely, Sample (Secondary) This is the secondary data source that was created when we nished creating our XML le data connection Notice that this data source has the same name as our data connection and that it is a secondary data source instead of the main one The data source itself may look strikingly similar to the main data source that s because InfoPath uses the same logic to create the data source for secondary sources as it does for primary sources Unlike the main data source, secondary data sources are never permitted to be edited since the structure of the data source is directly correlated with the external data Let s insert the eld1 repeating eld into the view as a Bulleted List This can be easily done by right-clicking eld1 in the Data Source task pane The Bulleted List is now bound to the secondary data source (We ll learn more about secondary data source binding in a moment) Try previewing the form
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Does nothing show up That s because we chose not to query the data connection automatically when we worked in the dialog shown in Figure 67 Then how do we get our data We learned in 5 that we can use the Rules feature on a Button click, among other form and data source events For now, we can use a Button control to query the data via the data connection Close the preview window and insert a Button control from the Controls task pane Let s create a rule to query our Sample data connection 1 Go to the Button Properties dialog 2 Click on the Rules button 3 Click the Add button to add a rule 4 In this rule, click the Add Action button to add the query action 5 Select the Query using a data connection action The Sample data connection should be automatically chosen since it s the only data connection in the form template 6 Click OK to close all open dialogs You could rename the Button control s label by using the Button Properties dialog if you want, but we ll leave ours labeled with the default name Button Let s preview again This time, we still don t have any data But clicking on the Button control will query the data connection and show the data from the Samplexml le, as seen in Figure 610 If you see the Microsoft Of ce InfoPath Security Notice dialog, click the Yes button to continue (A sample called QueryXmlFile is included with the samples for this chapter)
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