I'm trying to create simple web application (studies project) that allows to create books and libraries (book contains information about library).
My problems is: I want to show user select list of libraries while editing (Create/Update) library and allow choose one that will be saved within DB.
For now I have something like this: edit.xhtml (part)
<h:form id="book_form" prependId="false">
<p:messages id="msgs" autoUpdate="true"/>
<p:panelGrid columns="2">
<p:outputLabel value="Title" for="title"/>
<p:inputText id="title" required="true"
value="#{bookController.book.title}">
<f:validateLength maximum="50"/>
</p:inputText>
<p:outputLabel value="Author" for="author"/>
<p:inputText id="author" required="true"
value="#{bookController.book.author}">
<f:validateLength maximum="50"/>
</p:inputText>
<p:outputLabel value="Year" for="year"/>
<p:inputText id="year" required="true"
value="#{bookController.book.year}">
<f:convertNumber pattern="0"/>
<f:validateDoubleRange minimum="0" maximum="2020"/>
</p:inputText>
<p:outputLabel value="Library" for="library"/>
<p:selectOneMenu id="library" value="#{bookController.libId}" effect="fold" editable="true"> <!--converter="libraryConverter" value="#{bookController.book.library}"-->
<f:selectItem itemLabel="Select One" itemValue="#{null}" />
<f:selectItems value="#{bookController.libraries}" var="library" itemValue="#{library.id}" itemLabel="#{library.name}"/> <!-- itemValue="#{library.id}"--> <!-- var="library" itemLabel="#{library.name}" itemValue="#{library}" val-->
</p:selectOneMenu>
<f:facet name="footer">
<p:commandButton id="save_btn" value="Save"
update="@form"
action="#{bookController.actionSave()}"/>
<p:button value="Return to menu"
href="./index.xhtml"/>
</f:facet>
</p:panelGrid>
</h:form>
LibraryConverter.java - basing on Conversion Error setting value for 'null Converter' - Why do I need a Converter in JSF?
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package pl.polsl.lab45r.library;
import javax.ejb.EJB;
import javax.faces.application.FacesMessage;
import javax.faces.component.UIComponent;
import javax.faces.context.FacesContext;
import javax.faces.convert.Converter;
import javax.faces.convert.ConverterException;
import javax.faces.convert.FacesConverter;
import pl.LAB.model.Library;
/**
* Converter for library objects
* @version 1.0
*/
@FacesConverter("libraryConverter")
public class LibraryConverter implements Converter {
/**
* Bean for finding library
*/
@EJB
LibraryBean libraryBean;
@Override
public Object getAsObject(FacesContext context, UIComponent component, String submittedValue) {
if (submittedValue == null || submittedValue.isEmpty()) {
return null;
}
try {
return libraryBean.findLibraryById(Integer.valueOf(submittedValue));
} catch (NumberFormatException e) {
throw new ConverterException(new FacesMessage(submittedValue + " is not a valid Library ID"), e);
}
}
@Override
public String getAsString(FacesContext context, UIComponent component, Object modelValue) {
if (modelValue == null) {
return "";
}
if (modelValue instanceof Library) {
return String.valueOf(((Library) modelValue).getId());
} else {
throw new ConverterException(new FacesMessage(modelValue + " is not a valid Library"));
}
}
}
At first I tried saving library just as library object (not as some ID), but when I was trying to save I was getting errors that some name of library is not valid ID, however getAsString and getAsObject should work only on IDs, not on names. You can see what I tried in XHTML comments.
