Question

我需要您帮助您在jsf页面中禁用和启用selectManyCheckbox组件中的项目。首先，selectManyCheckbox组件显示三个chechbox（贷款 - 健康 - 转移）。该列表将从一个bean中填充，它具有代码：

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，我将运行一个返回Yes或No的SQL语句，并将该值添加到loanFlag变量中。如果flag =“Y”，我需要启用贷款复选框，以便用户可以选择它，否则我需要从selectManyCheckbox禁用它。问题是我在应用逻辑禁用和启用项目selectManyCheckbox时遇到了困难，我在上面的代码中列出并一直启用它们。

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

Answer 1

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

另一种选择是使用Map<hrCertificate, Boolean>代替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>

Answer 2

首先，请注意，属性不会退出支持它的实际属性，您只需要一个getter。所以你可以：

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;
   }
 }

如果您坚持要在.xhtml＆＃34;中进行过滤＆＃34;，可以将JSTL中的c:forEach与<f:selectItem>合并（注意 item ，而不是项目），但它会使你的xhtml更复杂，如果你想使用Ajax，可能会引起问题。

如何根据标志启用/禁用selecManyCheckbox中的项目

2 个答案: