I am learning JSF and have an understanding issue the way valueChangeListener works. I am trying to use the it inside the dataTable. The objective of using valueChangeListener here is- I want to track the changes user performs in the Title and First Name column.
Please find below code :
<p:dataTable var="tempVar"
value="#{tempView.tempVO}">
<p:column>
<h:outputLabel value="Academic Title:" />
<p:inputText value="#{tempVar.title}"
style="margin-left:10px;margin-top:20px;width:140px;height:25px"
valueChangeListener="#{tempView.titleChangeListener}">
<f:attribute name="TITLE" value="TITLE" />
</p:inputText>
<br />
<h:outputLabel value="First Name:" />
<p:inputText value="#{tempVar.firstName}"
style="margin-left:35px;margin-top:20px;width:140px;height:25px"
valueChangeListener="#{tempView.firstNameChangeListener}">
<f:attribute name="FIRST_NAME"
value="FIRST_NAME" />
</p:inputText>
<p:column>
</p:dataTable>
Bean Code
@PostConstruct
public void init() {
try {
tempVO = tempService
.fetchDataFromDatabase(tmpDataBean
.tempId());
System.out.println("success");
} catch (Exception e) {
e.printStackTrace();
}
}
public void titleChangeListener(ValueChangeEvent event) {
String title = (String) ((UIInput) event.getSource()).getAttributes()
.get("TITLE");
System.out.println(title);
}
public void firstNameChangeListener(ValueChangeEvent event) {
String firstName = (String) ((UIInput) event.getSource())
.getAttributes().get("FIRST_NAME");
System.out.println(firstName);
}
The issues I am facing is- valueChangeListener is called for all the database columns. For instance if I am changing only Title, it is calling first name valueChangeListener also. The answer provided by @BaluC on this links says that it should be called only when value changed. [When to use valueChangeListener or f:ajax listener?
[1]: When to use valueChangeListener or f:ajax listener? Could someone please help to understand the way valueChangeListener works, Am I using it in the wrong way? Thank you.
