In this example you will see how to
use the mask rule to restrict the user input. Here the userForm has two fields, one
for the user name and the other for the phone number. We will restrict the user
to enter only alphabets in the user name field and only numbers in the phone
number field. The struts-config.xml file has the following entry for userForm.
1.<form-beans>
2.<form-bean name="userForm"type="org.apache.struts.validator.DynaValidatorForm">
3.<form-property name="userName" type="java.lang.String" />
4.<form-property name="phoneNumber" type="java.lang.String" />
5.</form-bean>
6.</form-beans>
The validation.xml
file contains the following codes.
01.<form name="userForm">
02.<field property="userName" depends="required,mask">
03.<msg name="mask" key="userForm.username.mask" />
04.<arg key="userForm.username"/>
05.<var>
06.<var-name>mask</var-name>
07.<var-value>^[a-zA-Z]*$</var-value>
08.</var>
09.</field>
10.<field property="phoneNumber" depends="required,mask">
11.<msg name="mask" key="userForm.phoneNumber.mask" />
12.<arg key="userForm.phoneNumber"/>
13.<var>
14.<var-name>mask</var-name>
15.<var-value>^[0-9]*$</var-value>
16.</var>
17.</field>
18.</form>
The required rule is used to ensure that the value is entered by the user and the mask rule is used to restrict the user from entering invalid data.
The following
messages should be configured in the ApplicationResource.properties file. If
invalid data is entered by the user, then these values will be used to display
the appropriate error message.
1.userForm.username.mask = {0} should
contain only alphabets.
2.userForm.phoneNumber.mask = {0} should
contain only numbers.
3.userForm.username = User Name
4.userForm.phoneNumber = Phone Number
The "userForm.username.mask" value is
used to display the error message when an invalid user name is entered.
On running this
sample mask validation rule example the following page is displayed. The user
needs to enter a valid user name and phone number to register successfully.
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