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The JSF Event Model
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submitted automatically when the field on the client has changed without requiring the user to click on a submit button
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PART I PART I PART I
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<h:inputText value="foo" onchange="thisformsubmit();"> <f:valueChangeListener type="comjsfcomprefMyValueChangeListener"/> </h:inputText>
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After the user enters a value and tabs out of the input field, the JavaScript callout onchange will execute the JavaScript function thisformsubmit( ) and the form will be submitted by the browser client Since a value was changed in the field, the custom value change listener (MyValueChangeListener) will also execute its processValueChange( ) method as well Table 8-1 summarizes the alternate ways to work with action and value change events showing examples using both <h:commandButton/> and <h:inputText/> UI components:
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JSF 12 TIP JSF 12 introduces a binding attribute to the f:valueChangeListener and
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f:actionListener This attribute is analogous to the binding attribute on UIComponent tags with the exception that if the type attribute is also set, then it is used to create the listener instance (rather than the binding attribute) and the binding attribute is used to receive the reference to the newly created listener instance Moreover, the binding attribute is particularly helpful because you can create multiple reusable listener instances in a backing bean, configure them as you want in code, then reuse them across your app with a single point of maintenance Or you can create a listener as a managed bean, and have the ability to set properties This is not possible in JSF 11 or 10
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Listener Type
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Default action listener with action method Default action listener with action listener method Custom action listener class Default value change listener with value change listener method Custom value change listener class
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= <h:commandButton value="Click me!" action="#{ManagedBean actionMethod}" /> <h:commandButton value="Click me!" actionlistener="#{ManagedBean actionListenerMethod}" /> <h:commandButton value="Click me!" > <f:actionlistener type="packageCustomActionListener" /> </h:commandButton> <h:inputText value="foo" valuechangelistener="#{ManagedBean valueChangeListenerMethod}" />
<h:inputText value="foo" > <f:valueChangeListener type="packageCustomValueChangeListener"/> </h:inputText>
TABLE 8-1 Alternative Ways to Use Action and Value Change Listeners
Part I:
The JavaServer Faces Framework
Two Faces Event Examples
To gain a firm understanding of value change listeners, it will be useful to work through two examples Both examples are based on the Zip code scenario mentioned earlier in the chapter in which City and State fields are automatically filled in after the user provides a value in the Zip Code input field and then tabs out of the Zip Code field As explained, this mechanism lets the user avoid entering the city and state manually The first example shows how to implement the basic, auto-fill functionality by using a value change event and listener This example also shows how to avoid triggering a validation error by using the immediate attribute The second example expands on the first by showing how to conditionally render a portion of the UI also by using a value change listener where a UI component s rendered property is toggled when a checkbox is clicked
Using a Value Change Event to Auto-Fill Fields
For this first example, consider a form with the following input fields: Name, Zip Code, City, and State, like the one shown in Figure 8-4 The desire is to allow the user to enter a Zip code and have the City and State fields automatically filled in with the matching city and state, as shown in Figure 8-5 Building this example requires the processing of a value change event that is associated with the Zip Code input field The event is triggered when the user enters or changes a value, then tabs out of the field For this example we ll use the default value change listener along with a value change listener method The initial source code for the JSP page autozipjsp with the four fields is as follows:
<%@ taglib uri="http://javasuncom/jsf/core" prefix="f"%> <%@ taglib uri="http://javasuncom/jsf/html" prefix="h"%> <f:view> <html> <body> <h2>Address Form</h2> <h:form> <h:panelGrid columns="2"> <h:outputLabel value="Name:"/> <h:inputText id="inputname" binding="#{autozip_backinginputName}"/> <h:outputLabel value="Zip Code:"/> <h:inputText id="inputzip" binding="#{autozip_backinginputZip}"/> <h:outputLabel value="City:" /> <h:inputText id="inputcity" binding="#{autozip_backinginputCity}"/> <h:outputLabel value="State:"/> <h:inputText id="inputstate" binding="#{autozip_backinginputState}"/> <h:commandButton value="Submit"/> </h:panelGrid> </h:form> </body> </html> </f:view>
8:
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