Kann nicht initiale Sortierreihenfolge für DataTable programmgesteuert festlegen

Question

Ich muss sortBy für DataTable programmgesteuert von Bean festlegen. DataTable hat einen einzigen Sortiermodus, statische Spalten und ein benutzerdefiniertes Lazy-Modell zum Sortieren nach benutzerdefinierten Ausdrücken wie = "# {contractor.companyName-MULTY_LANG}". Ich habe viele Möglichkeiten versucht, dies zu tun, und nur eine Möglichkeit funktioniert (Code unten), funktioniert aber nicht richtig - Komponente zeigte ohne hervorgehobenes Feld. Kann jemand antworten, wie man sortBy für DataTable programmatisch setzt?

@PostConstruct 
    public void init() {  
     final DataTable d = (DataTable) FacesContext.getCurrentInstance().getViewRoot().findComponent(TABLE_COMPONENT_KEY); 
     String tableSortByExpression = "#{contractor.companyName-MULTY_LANG}"; // expression from some column 
     SortMeta sm1 = new SortMeta(); 
     for (UIComponent child : d.getChildren()) { 
      Column column = (Column)child; 
      ValueExpression columnSortByVe = column.getValueExpression("sortBy"); 
      if (columnSortByVe != null) { 
       String columnSortByExpression = columnSortByVe.getExpressionString(); 
       if (tableSortByExpression != null && tableSortByExpression.equals(columnSortByExpression)) { 
        d.setSortColumn(column); 
        d.setSortOrder("ASCENDING"); 
        break; 
       } 
      } 
     } 
    } 

Ich bin dankbar für jede Hilfe.

---

Grundflächen 5.1. Tomcat 7. Mojarra 2.2.8

Answer 1

allererst org.primefaces.component.datatable.feature.SortFeature erweitern

public class CustomSortFeature extends SortFeature { 
    @SuppressWarnings("rawtypes") 
    @Override 
    public void encode(FacesContext context, DataTableRenderer renderer, DataTable table) throws IOException { 
     table.setFirst(0); 

     if(table.isLazy()) { 
      table.loadLazyData(); 
      singleSort(context, table); 
     } 
     else { 
      if(table.isMultiSort()) 
       multiSort(context, table); 
      else 
       singleSort(context, table); 

      if(table.isPaginator()) { 
       RequestContext requestContext = RequestContext.getCurrentInstance(); 

       if(requestContext != null) { 
        requestContext.addCallbackParam("totalRecords", table.getRowCount()); 
       } 
      } 

      //save state 
      Object filteredValue = table.getFilteredValue(); 
      if(!table.isLazy() && table.isFilteringEnabled() && filteredValue != null) { 
       table.updateFilteredValue(context, (List) filteredValue); 
      } 
     } 

     renderer.encodeTbody(context, table, true); 
    } 
} 

Dann org.primefaces.component.datatable.DataTableRenderer

@FacesRenderer(componentFamily = "org.primefaces.component", rendererType = "org.primefaces.component.DataTableRenderer") 
public class CustomDataTableRenderer extends DataTableRenderer { 
    public List<DataTableFeatureKey> FEATURE = new ArrayList<DataTableFeatureKey>(){/** 
     * 
     */ 
     private static final long serialVersionUID = 1L; 

    { 
     add(DataTableFeatureKey.DRAGGABLE_COLUMNS); 
     add(DataTableFeatureKey.FILTER); 
     add(DataTableFeatureKey.PAGE); 
     add(DataTableFeatureKey.SORT); 
     add(DataTableFeatureKey.RESIZABLE_COLUMNS); 
     add(DataTableFeatureKey.SELECT); 
     add(DataTableFeatureKey.ROW_EDIT); 
     add(DataTableFeatureKey.CELL_EDIT); 
     add(DataTableFeatureKey.ROW_EXPAND); 
     add(DataTableFeatureKey.SCROLL); 
     add(DataTableFeatureKey.DRAGGABLE_ROWS); 
    }}; 
    @Override 
    protected void preRender(FacesContext context, DataTable table){ 
     table.setCaseSensitiveSort(false); 
     if(table.isLazy()) { 
      if(table.isLiveScroll()) 
       table.loadLazyScrollData(0, table.getScrollRows()); 
      else 
       table.loadLazyData(); 
     } 

     boolean defaultSorted = (table.getValueExpression("sortBy") != null || table.getSortBy() != null); 
     if(defaultSorted && !table.isLazy()) { 
      table.setDefaultSortByVE(table.getValueExpression("sortBy")); 
      table.setDefaultSortOrder(table.getSortOrder()); 
      table.setDefaultSortFunction(table.getSortFunction()); 

      CustomSortFeature sortFeature = (CustomSortFeature) table.getFeature(DataTableFeatureKey.SORT); 

      if(table.isMultiSort()) 
       sortFeature.multiSort(context, table); 
      else 
       sortFeature.singleSort(context, table); 

      table.setRowIndex(-1); 
     } 

     if(table.isPaginator()) { 
      table.calculateFirst(); 
     } 

     Columns dynamicCols = table.getDynamicColumns(); 
     if(dynamicCols != null) { 
      dynamicCols.setRowIndex(-1); 
     } 
    } 

    @Override 
    public void encodeEnd(FacesContext context, UIComponent component) throws IOException{ 
     DataTable table = (DataTable) component; 
     if(table.shouldEncodeFeature(context)) { 
      for(Iterator<DataTableFeatureKey> it = FEATURE.iterator(); it.hasNext();) { 
       DataTableFeature feature = table.getFeature(it.next()); 

       if(feature.shouldEncode(context, table)) { 
        feature.encode(context, this, table); 
       } 
      } 
     } 
     else { 
      preRender(context, table); 

      encodeMarkup(context, table); 
      encodeScript(context, table); 
     } 
    } 
} 

zu verlängern versuchen Des Weiteren

, fügen Sie machen Klasse Gesichter-config

<faces-config 
    xmlns="http://java.sun.com/xml/ns/javaee" 
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee 
    http://java.sun.com/xml/ns/javaee/web-facesconfig_2_0.xsd" 
    version="2.0"> 
     <render-kit> 
      <renderer> 
       <component-family>org.primefaces.component</component-family> 
       <renderer-type>org.primefaces.component.DataTableRenderer</renderer-type> 
       <renderer-class>com.edtoktay.CustomDataTableRenderer</renderer-class> 
      </renderer> 
     </render-kit> 
</faces-config> 

this helps