Question

背景

选择项目列表时，使用Ajax将事件触发到Web服务器。该元素是JSF rich:orderingList项。

问题

必须接收该事件的类：

public class BusinessAreaListHandler extends ListHandler<ListElement> {
  private static final long serialVersionUID = -581048454118449233L;

  public BusinessAreaListHandler() { load(); }
  public List<ListElement> getBusinessAreas() { return getList(); }
  public Set<ListElement> getSelection() { return getSet(); }

  public void select() {
    System.out.println( "Clicked Element" );
  }

  protected void load() {
    appendList( new ListElement( "employee" ) );
    appendList( new ListElement( "company" ) );
    appendList( new ListElement( "payroll" ) );
  }
}

ListElement容器对象：

public class ListElement implements Serializable {
  private static final long serialVersionUID = 5396525520175914504L;

  public final static char SEPARATOR = ':';

  private String id, value;

  protected ListElement( String value ) {
    this( Integer.toString( value.hashCode() ), value );
  }

  public ListElement( String id, String value ) {
    setId( id );
    setValue( value );
  }

  @Override
  public int hashCode() {
    return (53 * (getId().hashCode() + 5)) + (53 * (getValue().hashCode() + 5));
  }

  @Override
  public boolean equals( Object obj ) {
    ListElement le = null;

    if( obj != null && obj instanceof ListElement ) {
      le = (ListElement)obj;
    }

    return le == null ? false : compare( le );
  }

  private boolean compare( ListElement le ) {
    return getId().equals( le.getId() ) && getValue().equals( le.getValue() );
  }

  public String getId() {
    return this.id == null ? "" : this.id;
  }

  public void setId( String id ) {
    this.id = id;
  }

  public String getValue() {
    return this.value == null ? "" : this.value;
  }

  public void setValue( String value ) {
    this.value = value;
  }

  @Override
  public String toString() {
    return getValue();
  }
}

ListConverter：

public class ListConverter implements Converter {
  @Override
  public Object getAsObject( FacesContext fc, UIComponent ui, String value ) {
    ListElement result = new ListElement( value );
    int index = value.lastIndexOf( ListElement.SEPARATOR );

    System.out.println( "Convert FROM: " + value );

    if( index > 0 ) {
      String id = value.substring( 0, index );
      String v = value.substring( index + 1 );
      result = new ListElement( id, v );
    }

    System.out.println( "Convert TO  : " + result.toString() );

    return result;
  }

  @Override
  public String getAsString( FacesContext fc, UIComponent ui, Object value ) {
    return value.toString();
  }
}

设置列表和事件操作的XHTML片段：

<h:panelGrid columns="2">
  <h:panelGroup>
    <rich:orderingList value="#{businessAreas.list}" var="businessArea" converter="businessAreaConverter" immediate="true" orderControlsVisible="false" fastOrderControlsVisible="false" selection="#{businessAreas.selection}" id="BusinessAreas">
      <f:facet name="caption">
        <h:outputText value="Business Areas" />
      </f:facet>
      <rich:column>
        <h:outputText value="#{businessArea}" />
      </rich:column>
      <a4j:support event="onclick" ignoreDupResponses="true" requestDelay="500" action="#{businessAreas.select}" reRender="ColumnClusters" />
      <a4j:support event="onkeyup" ignoreDupResponses="true" requestDelay="500" action="#{businessAreas.select}" reRender="ColumnClusters" />
    </rich:orderingList>
  </h:panelGroup>
  <h:panelGroup>
    <rich:listShuttle sourceValue="#{columnClusters.list}" targetValue="#{domainContent.list}" var="columnCluster" converter="columnClusterConverter" sourceRequired="false" targetRequired="true" moveControlsVisible="true" orderControlsVisible="false" fastOrderControlsVisible="false" sourceCaptionLabel="Column Clusters" targetCaptionLabel="Domain Content" copyTitle="Move" copyControlLabel="Move" copyAllControlLabel="Move All" copyAllTitle="Move All" id="ColumnClusters">
      <rich:column>
        <h:outputText value="#{columnCluster}" />
      </rich:column>
    </rich:listShuttle>
  </h:panelGroup>
  <h:panelGroup>
    <h:commandButton action="action" value="Create Domain" />
  </h:panelGroup>
</h:panelGrid>

相应的托管bean在faces-config.xml中正确设置。

浏览器输出：

错误消息

显示以下错误消息：

信息：警告：FacesMessage已入队，但可能尚未显示。 sourceId = j_id2：ColumnClusters [severity =（ERROR 2），summary =（j_id2：ColumnClusters：验证错误：值是必需的。），detail =（j_id2：ColumnClusters：验证错误：值是必需的。）]

New Element (Hash:Value): 1193469614:employee
New Element (Hash:Value): 950484093:company
New Element (Hash:Value): -786522843:payroll
New Element (Hash:Value): 3373707:name
New Element (Hash:Value): -1147692044:address
New Element (Hash:Value): 114603:tax
New Element (Hash:Value): 1193469614:employee
Convert FROM: employee
Convert TO  : employee
New Element (Hash:Value): 950484093:company
Convert FROM: company
Convert TO  : company
New Element (Hash:Value): -786522843:payroll
Convert FROM: payroll
Convert TO  : payroll
New Element (Hash:Value): 3373707:name
Convert FROM: name
Convert TO  : name
New Element (Hash:Value): -1147692044:address
Convert FROM: address
Convert TO  : address
New Element (Hash:Value): 114603:tax
Convert FROM: tax
Convert TO  : tax

问题

当用户选择（或取消选择）项目时，在select()中触发对BusinessAreaListHandler的调用需要什么？

参考

谢谢！

Answer 1

问题在于这个属性：

targetRequired="true"

由于click会立即向服务器发出Ajax请求，因此预计右侧穿梭（目标）会有数据。如果没有数据，将发布验证错误。

验证错误：列表选择事件的值是必需的错误

背景

问题

错误消息

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问题

参考

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