我有一个<h:selectOneMenu>.
<h:selectOneMenu id="LoanType" style="width: 180px; font-size: 12px;" value ="#{editLoan.currentLoanType}" converter="#{convertToLoanType}">
<f:selectItems value="#{editLoan.loanTypeList}" var="parLoanType" itemValue="#{parLoanType}" itemLabel="#{parLoanType.loanTypename}"/>
<f:ajax listener="#{editLoan.loanTypeChanged}" execute="@this"/>
</h:selectOneMenu>
如果用户更改选择，那么我想调用一个侦听器方法。但是，我的转换器的getAsObject()方法没有被调用。唯一getAsString()的方法是，所以我null在监听器方法中得到了变量。
这是我的转换器类：
@ManagedBean
@RequestScoped
public class ConvertToLoanType implements Converter {
@PersistenceContext(unitName = "CrasmonClientPU")
private EntityManager em;
@Override
public Object getAsObject(FacesContext context, UIComponent component, String value) {
try{
int id = Integer.parseInt(value);
System.out.println("getting as object");
return em.find(ParLoantype.class, id);
}catch(Exception e){
System.out.println(e.getMessage());
}
return null;
}
@Override
public String getAsString(FacesContext context, UIComponent component, Object value) {
try{
ParLoantype pa = (ParLoantype) value;
return String.valueOf(pa.getLoanTypeid());
}catch(Exception e){
System.out.println(e.getMessage());
}
return null;
}
}
这是我的支持 bean 类：
@Named(value = "editLoan")
@SessionScoped
public class EditLoan implements Serializable {
@Inject
private LoanmainController lmainController;
ParLoantype currentLoanType;
LoanMain loanMain;
List<LoanMain> allLoans;
List<ParLoantype> loanTypeList;
public EditLoan() {
}
@PostConstruct
public void init(){
currentLoanType = lmainController.findLoantype(1);
this.allLoans = findLoansByParLoantype(currentLoanType);
this.loanTypeList = lmainController.prepareAllParLoantype();
}
public void loanTypeChanged(){
System.out.println(this.currentLoanType.getLoanTypename());
//this.allLoans = findLoansByParLoantype(currentLoanType);
}
public List<LoanMain> findLoansByParLoantype(ParLoantype type){
return lmainController.findLoansByParLoanType(type.getLoanTypeid());
}
}