JSF动态生成固定表头和行标的DataTable

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一只小苹…

2007-7-24

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MyBean.java

package mypackage;

import java.util.ArrayList;
import java.util.List;

import javax.faces.application.Application;
import javax.faces.component.UIColumn;
import javax.faces.component.UIOutput;
import javax.faces.component.html.HtmlCommandLink;
import javax.faces.component.html.HtmlDataTable;
import javax.faces.component.html.HtmlOutputText;
import javax.faces.context.FacesContext;
import javax.faces.el.MethodBinding;
import javax.faces.el.ValueBinding;
import javax.faces.event.ActionEvent;

public class MyBean {

    private List<List<String>> myList;

    private List<List<String>> myHeader;

    private List<List<Integer>> myNum;

    private HtmlDataTable dynamicDataTable;

    private HtmlDataTable headerDataTable;

    private HtmlDataTable numDataTable;

    private static int tempWidth = 30;

    // Load Data from DataBase to Every DataTable --------------------------------
    public void loadMyList() throws Exception {

        myList = new ArrayList<List<String>>();

        int row = 25;

        while(row > 0) {

            int column = 25;

            String str = "o";

            List <String> tmpvector = new ArrayList <String> ();

            while(column > 0) {

                tmpvector.add(str);

                column--;
            }
            row--;

            myList.add(tmpvector);
        }
    }

    public void loadMyHeader() throws Exception {

        myHeader = new ArrayList<List<String>>();

        String str = "*****";

        int column = 25;

        List <String> tmpvector = new ArrayList <String> ();

        while(column > 0) {

            tmpvector.add(str);

            column--;
        }
        myHeader.add(tmpvector);
    }

    public void loadMyNum() throws Exception {

        myNum = new ArrayList<List<Integer>>();

        int row = 0;

        while(row < 25) {

            List <Integer> tmpvector = new ArrayList <Integer> ();

            tmpvector.add(row);

            myNum.add(tmpvector);

            row++;
        }
    }

    //initialize Every DataTable to the Front-------------------------------------
    public void populateDynamicDataTable() {

        if (myList != null && myList.size() > 0) {

            dynamicDataTable = new HtmlDataTable();

            int columns = ((List) myList.get(0)).size();

            System.out.println("DisplayCloumn:   " + columns);//

            for (int i = 0; i < columns; i++) {

                ValueBinding myItem =
            FacesContext.getCurrentInstance().getApplication().createValueBinding("#{myItem[" + i + "]}");

                UIColumn column = new UIColumn();

                HtmlOutputText outputText = new HtmlOutputText();

                outputText.setValueBinding("value", myItem);

                outputText.setStyle("width: " + tempWidth + "");

                column.getChildren().add(outputText);

              column.setId("col_" + i);  //You should set ID of every component which you create in the Backing-Bean .

                dynamicDataTable.getChildren().add(column);
            }
        }
    }

    public void populateHeaderDataTable() {

        if (myHeader != null && myHeader.size() > 0) {

            headerDataTable = new HtmlDataTable();

            int columns = ((List) myHeader.get(0)).size();

            FacesContext facesContext = FacesContext.getCurrentInstance();

            Application application = facesContext.getApplication();

            for (int i = 0; i < columns; i++) {

                HtmlCommandLink commandLink =
                 (HtmlCommandLink) application.createComponent(HtmlCommandLink.COMPONENT_TYPE);

                String valueBindingExpression = "#{myHeader[" + i + "]}";
                ValueBinding valueBinding = application.createValueBinding(valueBindingExpression);
                commandLink.setValueBinding("value", valueBinding);

   commandLink.setId("head_comankLink_" + i);//The most important!!! If you dont put it nothing is gonna happen.


                commandLink.setStyle("color: blue");

                commandLink.setStyle("width: " + tempWidth + "");

                commandLink.getAttributes();

                Class[] params = { ActionEvent.class };
                MethodBinding actionListener =
                  application.createMethodBinding("#{myBean.setSelectedDocumentId}", params);
                commandLink.setActionListener(actionListener);

                commandLink.setImmediate(true);

                UIColumn column = new UIColumn();
                column.getChildren().add(commandLink);
                column.setId("head_" + i);

                headerDataTable.getChildren().add(column);
            }
        }
    }

    public void populateNumDataTable() {

        if (myNum != null && myNum.size() > 0) {

            numDataTable = new HtmlDataTable();

            UIOutput output = new UIOutput();

            ValueBinding myItem =
              FacesContext.getCurrentInstance().getApplication().createValueBinding("#{myNum[0]}");

            output.setValueBinding("value", myItem);

            // Set column.
            UIColumn column = new UIColumn();
            column.getChildren().add(output);
            column.setId("num");

            numDataTable.getChildren().add(column);
        }
    }

    //Test Actions and ActionListeners--------------------------------------------

    public void setSelectedDocumentId(ActionEvent event) throws Exception
    {

    }

    // Getters -------------------------------------------------------------------
    public HtmlDataTable getDynamicDataTable() throws Exception {
        if (dynamicDataTable == null) {

            loadMyList(); // Reload to get most recent data.

            populateDynamicDataTable();
        }
        return dynamicDataTable;
    }

    public HtmlDataTable getHeaderDataTable() throws Exception {
        if (headerDataTable == null) {

            loadMyHeader(); // Reload to get most recent data.

            populateHeaderDataTable();
        }
        return headerDataTable;
    }

    public HtmlDataTable getNumDataTable() throws Exception {
        if (numDataTable == null) {

            loadMyNum(); // Reload to get most recent data.

            populateNumDataTable();
        }
        return numDataTable;
    }

    public List<List<Integer>> getMyNum() {
        return myNum;
    }

    public List<List<String>> getMyHeader() {
        return myHeader;
    }

    public List<List<String>> getMyList() {
        return myList;
    }

    // Setters -------------------------------------------------------------------
    public void setDynamicDataTable(HtmlDataTable dynamicDataTable) {
        this.dynamicDataTable = dynamicDataTable;
    }

    public void setHeaderDataTable(HtmlDataTable headerDataTable) {
        this.headerDataTable = headerDataTable;
    }

    public void setMyHeader(List<List<String>> myHeader) {
        this.myHeader = myHeader;
    }

    public void setNumDataTable(HtmlDataTable numDataTable) {
        this.numDataTable = numDataTable;
    }

    public void setMyNum(List<List<Integer>> myNum) {
        this.myNum = myNum;
    }

    public void setMyList(List<List<String>> myList) {
        this.myList = myList;
    }
}

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