The Java EE 5 Tutorial (PDF) - Oracle Software Downloads

Hi. My name is Duke. I’m thinking of a number from
to
.
Can you guess it?
...
See “Backing Beans” on page 307 for more information on creating beans, binding to bean
properties, referencing bean methods, and configuring beans.
See “Using Text Components” on page 328 for more information on the inputText tag.
Registering aValidator on aText Field
By nesting the validateLongRange tag within a text field’s component’s tag, the page author
registers a LongRangeValidator onto the text field. This validator checks whether the
component’s local data is within a certain range, defined by the validateLongRange tag’s
minimum and maximum attributes.
In the case of the greeting page, you need to validate the number the user enters into the text
field. So, you add a validateLongRange tag inside the inputText tag. The maximum and minimum
attributes of the validateLongRange tag get their values from the minimum and maximum
properties of UserNumberBean using the value expressions #{UserNumberBean.minimum} and
#{UserNumberBean.maximum}. See “Backing Beans” on page 307 for details on value
expressions.
After adding the validateLongRange tag, the page looks like this:
Hi. My name is Duke. I’m thinking of a number from
to
.
Can you guess it?
A Simple JavaServer Faces Application
Chapter 10 • JavaServer FacesTechnology 291