Validation through a separate filter

saoj — GMT

[code]

public class HelloValidator extends ValidationFilter {

public void prepareValidator(Validator val, Action action, String innerAction) {

Rule required = RequiredFieldRule.getInstance();

val.add("username", required, "required_error");
val.add("username", StringRule.getInstance(6, 30), "invalid_username");

val.add("age", required, "required_error");
val.add("age", IntegerRule.getInstance(18, 50), "invalid_age");

val.add("password", required, "required_error");
val.add("password", StringRule.getInstance(4, 20), "invalid_password_length");
val.add("password", EqualRule.getInstance("password", "passconf"), "password_does_not_match");

val.add("passconf", required, "required_error");
}
}
[/code]

And the internationalized messages would be inside the /validation/HelloValidator_[i]loc[/i].i18n file, where [i]loc [/i]is the locale (ex: HelloValidator_en_US.i18n). OBS: If you are using a master i18n file through [i]LocaleManager.useMasterI18N(true)[/i], then your messages will be inside the /i18n/master_en_US.i18n.
[code]
###############################################
# Messages for the filter HelloValidator #
###############################################

required_error = Required field cannot be left blank
invalid_username = Your username must be between %min% and %max% characters long.
invalid_age = You must be %min% years old or older.
invalid_password_length = Your password must be between %min% and %max% characters long.
password_does_not_match = Passwords do not match.
[/code]
Now if you don't want to put your messages in a separate file, then you can just hardcode your messages:
[code]
public class HelloValidator extends ValidationFilter {

private static final String FIELD_REQUIRED_ERROR = "Field required!";
private static final String INVALID_USERNAME_LENGTH = "Username length invalid!";
private static final String INVALID_AGE = "Invalid age!";
private static final String INVALID_PASSWORD_LENGTH = "Invalide password length!";
private static final String PASSWORD_DOES_NOT_MATCH = "Passwords do not match!";

public void prepareValidator(Validator val, Action action, String innerAction) {

Rule required = RequiredFieldRule.getInstance();

val.add("username", required, FIELD_REQUIRED_ERROR);
val.add("username", StringRule.getInstance(6, 30), INVALID_USERNAME_LENGTH);

val.add("age", required, FIELD_REQUIRED_ERROR);
val.add("age", IntegerRule.getInstance(18, 50), INVALID_AGE);

val.add("password", required, FIELD_REQUIRED_ERROR);
val.add("password", StringRule.getInstance(4, 20), INVALID_PASSWORD_LENGTH);
val.add("password", EqualRule.getInstance("password", "passconf"), PASSWORD_DOES_NOT_MATCH);

val.add("passconf", required, FIELD_REQUIRED_ERROR);
}
}
[/code]
Now to display your message in the JSP, you can use the menta tag. You can choose from mtw:hasError and mtw:outError tag.
[code]
<%@ taglib uri="/WEB-INF/lib/mentawai.jar" prefix="mtw" %>

Hello Validation!

Your username:

Your age:

Your password:

Again please:

[/code]
Note that this tags are conditional tags, in other words, nothing will be shown if there is no error for the field.

To add the HelloValidator as an action specific filter inside your application manager, you can just do this:
[code]
@Override
public void loadActions() {

action(HelloAction.class)
.filter(new HelloValidator());

// OR

ActionConfig ac = new ActionConfig(HelloAction.class);
ac.addFilter(new HelloValidator());
addActionConfig(ac);
}
[/code]
[color=red][b]TIP:[/b][/color] Use the Mentawai HTML form tags mtw:input, mtw:select, etc. so you don't have to worry about re-displaying the values that the user typed in case of validation error. We know you don't want to place a bunch of scriptlets in your JSPs to do this.

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