如何根据标志在 selectManyCheckbox 中 enable/disable 项目

How to enable/disable item in selecManyCheckbox based on flag

我需要你的帮助来禁用和启用 jsf 页面中 selectManyCheckbox 组件的项目。首先,selectManyCheckbox 组件显示三个复选框,它们是(贷款 - 健康 - 转账)。该列表将从具有以下代码的 bean 填充:

private List<hrCertificate> hrCertificatesList = new ArrayList<hrCertificate>(); 

//Getter and Setter

Private String loanFlag="";

@PostConstruct
public void init() {

    this.hrCertificatesList.add(new hrCertificate(("Loan"), "LC"));
    this.hrCertificatesList.add(new hrCertificate(("Health"), "HI"));
    this.hrCertificatesList.add(new hrCertificate(("Trasnfer"), "TE"));    
}

在同一个 bean 中,我将 运行 一个 SQL 语句 return 是或否,我将把它添加到 loanFlag variable.So 如果标志 ="Y",我需要启用贷款复选框以便用户可以 select 否则我需要从 selectManyCheckbox 禁用它。问题是我在应用逻辑来禁用和启用项目时遇到困难 selectManyCheckbox在上面的代码中我一直列出并启用它们。

selectManyChexkbox 的代码:

 <p:selectManyCheckbox id="hrCertificates" value="#{user.selectedHRCertificates}" layout="pageDirectio>
     <f:selectItems value="#{user.hrCertificatesList}" 
         var="hrCertificate" itemLabel="#{hrCertificate.hrCertificateName}"
         itemValue="#{hrCertificate.hrCertificateCode}"/>

 </p:selectManyCheckbox>

那么如何应用逻辑

首先,请注意 属性 不会淘汰支持它的实际属性,您只需要 getter。所以你可以拥有:

public class MyBean implements Serializable {

   private FilterEnum certFilter = FilterEnum.NO_FILTER;
   private List<Certificate> certificates;

   ... // including certificates initialization.

   public FilterEnum getCertFilter() {
     return this.certFilter;
   }

   public void setCertFilter(FilterEnum certFilter) {
     this.certFilter = certFilter;
   }

   public List<Certificate> getCertificates() {
     // I am sure there is a cooler way to do the same with streams in Java 8
     ArrayList<Certificate> returnValue = new ArrayList<>();
     for (Certificate certificate : this.certificates) {
       switch (this.certFilter) {
       case FilterEnum.NO_FILTER:
         returnValue.add(certificate);
         break;
       case FilterEnum.ONLY_YES:
         if (certificate.isLoan) {
           returnValue.add(certificate);
         }
         break;
       case FilterEnum.ONLY_NO:
         if (!certificate.isLoan) {
           returnValue.add(certificate);
         }
         break;
       }
     }
     return returnValue;
   }
 }

如果您坚持要进行过滤 "in the .xhtml",您可以将来自 JSTL 的 c:forEach<f:selectItem> 结合使用(注意 item ,而不是 items),但它会使您的 xhtml 更加复杂,如果您想使用 Ajax 可能会导致问题。

您可以编辑您的 hrCertificate class 以添加 disabled 布尔字段吗?如果是,那么您可以将 itemDisabled="#{hrCerticate.disabled}" 添加到 f:selectItems 中,这应该是最简单的解决方案。

另一种选择是使用 Map<hrCertificate, Boolean> 而不是 List<hrCertificate>

private Map<hrCertificate, Boolean> hrCertificatesMap = new HashMap<hrCertificate, Boolean>();

@PostConstruct
public void init() {
     hrCertificatesMap.put(new hrCertificate(("Loan"), "LC"), null);
     hrCertificatesMap.put(new hrCertificate(("Health"), "HI"), null);
     hrCertificatesMap.put(new hrCertificate(("Trasnfer"), "TE"), null);
 }

 // Then when you're done with your SQL query, update your Map to add the corresponding boolean values...

.xhtml

<p:selectManyCheckbox id="hrCertificates" value="#{user.selectedHRCertificates}" layout="pageDirectio>
    <f:selectItems value="#{user.hrCertificatesMap.keySet().toArray()}" var="hrCertificate" itemLabel="#{hrCertificate.hrCertificateName}" itemValue="#{hrCertificate.hrCertificateCode}" itemDisabled="#{user.hrCertificatesMap.get(hrCertificate)}" />
</p:selectManyCheckbox>