Microsoft Office Tutorials and References
In Depth Information
Validating User Input
Many of the problems that arise when a form-based application is used result from the entry of
incorrect data. Some errors are impossible to catch, for example if someone mistypes an email
address as bill_gates@microsift.com. But you can catch other errors such as:
n An email address without the @ character
n A ZIP code only four digits long
n A data field left blank when an entry is required
n A percentage value way out of range
With the data validation feature available for Outlook forms, you can catch many errors before they
cause a problem.
Data validation is performed at the field level. When you add a field to a form, you can define
validation rules for it. When a user adds data to the form and then posts or sends it, the rules are
evaluated and if a violation is encountered, a message is displayed to the user who can then make
the necessary corrections.
You define validation rules on the Validation tab of a field’s properties sheet. This is shown in
Figure 27.11.
FIGURE 27.11
Use the Validation tab of the properties sheet to create validation rules for a field.
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