Books for you

3. Email address is not required, but if entered, should match a common
pattern.
Here are the changes to the Registration page template that will implement the
specified validation rules:

t:validate="required,minlength=3,maxlength=8"/>

??¦

t:validate="required,minlength=3,maxlength=8"/>

...

t:validate="required,min=5,max=120"/>

...
t:validate="regexp"/>
As you see, it is very easy to pass a parameter to a validator, like min=5 or
maxlength=8. But, where do we specify a pattern for the Regexp validator?
The answer is, in the message catalog. Let's add the following line to the
app.properties file:
email-regexp=^([a-zA-Z0-9_.-])+@(([a-zA-Z0-9-])+.)
+([a-zA-Z0-9]{2,4})+$
Chapter 6
[ 163 ]
This will serve as a regular expression for all Regexp validators applied to
components with ID email throughout the application. In the next chapter you will
see how to create page-specific message catalogs.
Run the application, go to the Registration page and, try to submit the empty form.


Pages:
189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213