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Figure 10-4. The frmLkpContactEventTypes form is a continuous form.
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Subforms are a good way to show related data from the many side of a one-to-many relationship. For example, the frmCompanies form, shown in Figure 10-5 on the next page, has a subform to display the related contacts. Although this form looks much like a single display panel, it has a subform (which looks more like a datasheet than a form) embedded in the main form. The main part of the frmCompanies form displays information from the tblCompanies table, while the subform in the lower part of the window shows information from the tblCompanyContacts table about the contacts related to the current company. This form looks quite complicated, but it really isn t difficult to build. Because the LawTrack Contacts database is well designed, it doesn t take much effort to build the queries that allow the form to display information from three different tables. Most of the work of creating the form goes into selecting and placing the controls that display the data. To link a subform to a main form, you have to set only two properties that tell Access which linking fields to use. (These are actually the same Link Master Fields and Link Child Fields properties you learned about in 8, Building Complex Queries, when you defined a subdatasheet for a query.) In 13, Advanced Form Design, you ll build a subform and link it to a form.
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Part 3: Creating Forms and Reports in a Desktop Application
Microsoft Office Access 2003 Inside Out
Part 1: Part Title
10 10
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Figure 10-5. The frmCompanies form with an embedded subform that shows the related contacts.
Pop-Up Forms
Sometimes it s useful to provide information in a window that stays on top regardless of where you move the focus in your application. You ve probably noticed that the default behavior for windows in Microsoft Windows is for the active window to move to the front and for all other windows to move behind the active one. One exception is the Office toolbars. If you grab a toolbar and undock it, it stays floating on top so that you can still access its commands regardless of what you are doing behind it. This sort of floating window is called a pop-up window. You can create forms in Access that open in pop-up windows (called pop-up forms in Access). If you open any form in the LawTrack Contacts application and then choose About LawTrack Contacts from the Help menu, this opens the frmAbout form shown in Figure 10-6, which is designed as a pop-up form. See 24, The Finishing Touches, for more details about how to create custom menus for forms. If you still have frmCompanies open, you can choose About LawTrack Contacts from the Help menu. Or, you can switch to the Database window and open the frmAbout form directly to see how it behaves. Notice that if you click in the open form or Database window behind it, the frmAbout form stays on top. Click the Close button on the pop-up form to close it.
Part 3: Creating Forms and Reports in a Desktop Application
Using Forms
F10QQ06
Figure 10-6. The frmAbout pop-up form floats on top of frmCompanies, which has the focus.
Modal Forms
As you add functionality to your application, you ll encounter situations in which you need to obtain some input from the user or convey some important information to the user before Access can proceed. Access provides a special type of form, called a modal form, that requires a response before the user can continue working in the application. The fdlgContactSearch dialog box in the LawTrack Contacts database, shown in Figure 10-7 on the next page, is a modal form. This dialog box normally opens when you click the Contacts button on the main switchboard form and then click the Search button on the resulting Select Contacts (frmContactList) form. This window also opens if you first open frmContacts and then click the Search button. You can open the form on which the dialog box is based directly from the Database window. You ll notice that as long as this dialog box is open, you can t select any other window or menu in the application. To proceed, you must either enter some search criteria and click the Search button or click the Cancel button to dismiss the form.
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