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Part 5: Automating an Access Application
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Understanding Event Processing each action in sequence until it encounters a StopMacro action, another macro name, or no further actions. As you ll see later, you can control whether some actions execute by adding tests in the Condition column of the macro. If you open the PrintOptions form in Design view (see Figure 21-13) and look at the properties for each of the command buttons, you ll see that the On Click property contains the name of the macro that executes when the user clicks the command button. If you open the drop-down list for any event property, you can see that Access lists all macro objects and the named macros within them to make it easy to select the one you want.
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The On Click property of a command button set to execute a macro.
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Remember, the macro name is divided into two parts. The part before the period is the name of the macro object, and the part after the period is the name of a specific macro within the object. So, for the first command button control, the On Click property is set to DoReport.PrintIt. When the user clicks this button, Access runs the PrintIt macro in the DoReport macro object. After you specify a macro name in an event property, you can click the Build button next to the property and Access opens that macro in a Macro window.
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In some macros, you might want to execute some actions only under certain conditions. For example, you might want to update a record, but only if new values in the controls on a form pass validation tests. Or you might want to display or hide certain controls based on the value of other controls. The PrintIt macro in the DoReport macro group is a good example of a macro that uses conditions to determine which action should proceed. Select DoReport from the list of macros in the Wedding List Macro database, and click the Design button to see the Macro window. Click in the Condition column of the first line of the PrintIt macro, and press Shift+F2 to open the Zoom window, shown in Figure 21-14. (If you can t see the Condition column, click the Conditions button on the toolbar.)
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Part 5: Automating an Access Application
Microsoft Office Access 2003 Inside Out
Part 1: Part Title
21 21
Figure 21-14.
A condition in the DoReport macro group shown in the Zoom window.
As you saw earlier, this macro is triggered by the On Click property of the Print button on the PrintOptions form. This form allows the user to print a specific report by selecting the appropriate option button and then clicking the Print button. If you look at the form in Design view (see Figure 21-13), you ll see that the option buttons are located within an option group control on the form. Each option button sets a specific numeric value (in this case, 1 for the first button, 2 for the second button, 3 for the third button, and 4 for the fourth button) in the option group, which you can test in the Condition column of a macro. When you include a condition in a macro, Access won t run the action on that line unless the condition evaluates to True. If you want to run a series of actions on the basis of the outcome of a test, you can enter the test in the Condition column on the first action line and enter an ellipsis ( ) in the Condition column for the other actions in the series. This causes Access to evaluate the condition only once and execute additional actions (those with an ellipsis in the Condition column) if the original test evaluated to True. In this particular example, the condition tests the value of the option group control on the form. You can reference any control on an open form by using the syntax
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