April 2004
Intermediate to advanced
606 pages
20h 4m
English
Content preview from JavaServer FacesBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Programmatically Modifying Components
In all examples you’ve seen so far, component property values are pulled in from a bean, like here:
<h:commandButton value="New" disabled="#{reportHandler.newDisabled}" />I personally like this model, because it provides a clean separation between application logic and user interface components, but it’s not the only model supported by JSF. Some people are used to manipulating component properties programmatically instead. For instance, say you want to highlight an invalid value by turning the text in an input field red and adding a custom error message next to the field. To do so programmatically, you need references to the input component and the output component that holds the error message. Then you need to call the appropriate property setter method on the components.
The most convenient and easiest way to get a reference to a JSF component is using a component binding. A component binding is a special type of value binding that JSF uses to bind a component instance to a property in a bean. Here’s an example:
<%@ page contentType="text/html" %>
<%@ taglib uri="http://java.sun.com/jsf/html" prefix="h" %>
<%@ taglib uri="http://java.sun.com/jsf/core" prefix="f" %>
<f:view>
<html>
<body bgcolor="white">
<h:form>
Everything but "the kitchen sink":
<h:inputText validator="#{myBean.validateText}" />
<h:outputText binding="#{myBean.errorComp}" />
<br>
<h:commandButton value="Test" />
</h:form>
</body>
</html>
</f:view>This page contains a form with ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.