使用分页时，在rich：dataTable中选择的h：selectBooleanCheckbox丢失

Question

I have list of h:selectBooleanCheckBox in rich:dataTabe. Also, there is pagination for the datatable.

The problem is when I click the next page number, the selected checkboxes at the first page of the datatable is gone. Though they are selected, clicking the next/previous page make them deselected.

Any idea about the problem?

These are the annotations for bean.

@ManagedBean(name = "bean") 
@ViewScoped

To clarify it, I've attached my facelets and bean code below:

<rich:dataTable  value="#{bean.ssTable}" var="data" iterationStatusVar="it" id="myDataTable">     
    ...
    <rich:column id="includeInWHMapping" >

        <f:facet name="header">
            <h:selectBooleanCheckbox value="#{bean.selectAll}" valueChangeListener="#{bean.selectAllCheckBox}">
                <f:ajax render="myDataTable" />
            </h:selectBooleanCheckbox>  
        </f:facet>      

       <h:selectBooleanCheckbox id="selectedForWHProcess" value="#{bean.checked[data]}">        
            <f:ajax actionListener="#{bean.selectAllRows}" />
       </h:selectBooleanCheckbox>   

    </rich:column>
    ...
</rich:dataTable>

Bean code:

    private Map<StandardStructure, Boolean> checked = new HashMap<StandardStructure, Boolean>();
    private boolean selectAll;

    /* Controller */
    public MyController() {
        super(new DataSetParameters()); 

        logger.info("StandardStructureController created.");

        Column rowid_col =new Column("rowid", "rowid",  "No.", FilterTypes.NUMERIC, true, true, "");
        Column fileid_col =new Column("fileid", "fileid",   "File ID", FilterTypes.STRING, true, true, "");
        Column releasetag_col =new Column("releasetag", "releasetag",   "Releasetag ID", FilterTypes.STRING, true, true, "");
        Column applicationid_col =new Column("applicationid", "applicationid",  "Application ID", FilterTypes.STRING, true, true, "");
        Column filename_col =new Column("filename", "filename", "Filename", FilterTypes.STRING, true, true, "ASC");
        Column includeInWHMapping_col =new Column("includeInWHMapping", "includeInWHMapping",   "Include in WH Mapping?", FilterTypes.NONE, true, true, "");

        columns.put("fileid", fileid_col);
        columns.put("releasetag", releasetag_col);
        columns.put("applicationid", applicationid_col);
        columns.put("filename", filename_col);
        columns.put("includeInWHMapping", includeInWHMapping_col);

        initialize();
        setOrderField("importDate");
        setOrder("DESC");   
        dataSetParameters.setColumns(columns);
        loadTable();
    }

    /** getter/setter.. */
    public boolean isSelectAll() {
        return selectAll;
    }
    public void setSelectAll(boolean selectAll) {
        this.selectAll = selectAll;
    }

    public Map<StandardStructure, Boolean> getChecked() {
        return checked;
    }

    public void setChecked(Map<StandardStructure, Boolean> checked) {
        this.checked = checked;
    }
    /** Load ssTable */
    private void loadTable() {
        try{
            ssTable = new StandardStructureDao(dataSetParameters).getAllStandardStructure();
        }catch (Exception ex){
            System.out.println("Exception in loading table:"+ex);
        }
    }

    /** Get ssTable */
    public Collection<StandardStructure> getSsTable(){  
        return ssTable.getDto();
    }

    /** Pagination */
    public void doPaginationChange(ActionEvent event) {         
        super.doPaginationChange(event);
        loadTable();

        /* trying to set the value of list of checkboxes after loading the table */ 
        Iterator<StandardStructure> keys = checked.keySet().iterator(); 
        while(keys.hasNext()){
            StandardStructure ss = keys.next();
            if(checked.get(ss)){ /* getting checked boxes */
                /* Got stuck here. */ 
               /* How do we just set the true (boolean) value only 
                for list of checkboxes though they are in Map?*/
                System.out.println("Row id: " + ss.getRowid() + " Checked : " + checked.get(ss));       
            }
        }
    }

    /** Select all the list of checkbox in datatable */
    public void selectAllCheckBox(){
        for(StandardStructure item : ssTable.getDto()){
            if(!selectAll)
                checked.put(item, true);
            else
                checked.put(item, false);
        }
    }

    /** Select row of data in datatable */
    public void selectAllRows(ValueChangeEvent e) {
        boolean newSelectAll = (Boolean) e.getNewValue();
        Iterator<StandardStructure> keys = checked.keySet().iterator();
        logger.info("Rows selected..." + newSelectAll);
        while(keys.hasNext()) {
            StandardStructure ss = keys.next();
            checked.put(ss, newSelectAll);
            System.out.println("File::"+ss.getRowid()+":"+newSelectAll);
        }   
    }

Many Thanks!

Answer 1

Since your code is unclear and confusing, I'll provide you the minimal example how pagination with select all on current page MIGHT look like. With no action listeners, just getters and setter. As simple as I could.

First XHTML:

<h:form>
    <rich:dataTable value="#{bean.valuesOnPage}" var="data" id="dataTable" rows="20">
        <rich:column>
            <f:facet name="header">
                <h:selectBooleanCheckbox value="#{bean.selectAll}">
                    <f:ajax render="dataTable" />
                </h:selectBooleanCheckbox>
            </f:facet>
            <h:selectBooleanCheckbox value="#{bean.checked[data]}">
                <f:ajax />
            </h:selectBooleanCheckbox>
        </rich:column>

        <!-- other columns -->
    </rich:dataTable>
</h:form>

Then the bean:

@ManagedBean(name = "bean")
@ViewScoped
public class MyBean {

    // when the view is first loaded this is empty
    // until someone will click one of checkboxes
    private Map<Object, Boolean> checked = new HashMap<Object, Boolean>();
    private boolean selectAll;

    private List<Object> valuesOnPage;
    private int currentPage = -1;

    MyBean() {
        setCurrentPage(1);
    }

    // no setter
    public Map<Object, Boolean> getChecked() {
        return checked;
    }

    public int getCurrentPage() {
        return currentPage;
    }

    public boolean getSelectAll() {
        return selectAll;
    }

    // no setter
    public List<Object> getValuesOnPage() {
        return valuesOnPage;
    }

    private void loadTable() {
        try {
            // gets data from data base
            valuesOnPage = getData(currentPage);
        } catch (Exception ex) {
            System.out.println("Exception in loading table:" + ex);
        }
    }

    public void setCurrentPage(int currentPage) {
        if (this.currentPage != currentPage) {
            this.currentPage = currentPage;
            loadTable();
            // we don't need it selected, especially if it
            // was a paged we've never been on
            selectAll = false;
        }
    }

    public void setSelectAll(boolean selectAll) {
        this.selectAll = selectAll;
        for (Object o : valuesOnPage) {
            checked.put(o, selectAll);
        }
    }
}

Look how and when the data is changing and when it is loaded. Check out that there's no unnessecary new action for checkbox of single row. JSF will take care of that with: value="#{bean.checked[data]}" .

And once again: Your keys in map are objects. You have to make sure that equals method is good. In 95% of case the default is not, especially if they are @Entity . Check ie this topic .