ADF Table : Row selection using checkboxes @ MISTECH 技術手抄本

From: Polin Wei

在Table的作業中, 常會有將所有筆數全選( Select All Rows)的需求, 在 ADF 的 Table 要實現這樣的效果卻有點難(好難搞的 ADF....) , Google 一下查到一些高手的作法, 整理如下.

前置作業:

1. 使用 Table: USERS 來作示範

CREATE TABLE "USERS"(
      "USERNAME" VARCHAR2(15 BYTE) NOT NULL PRIMARY KEY ENABLE ,
    "NAME"     VARCHAR2(255 BYTE) NOT NULL ENABLE,
    "PASSWORD" VARCHAR2(15 BYTE) NOT NULL ENABLE
)

2. 建立一個 JavaBean: UsersTableBean

package com.wei.bean;

import com.wei.utils.ADFUtils;

import java.util.ArrayList;

import javax.faces.event.ValueChangeEvent;

import oracle.adf.model.binding.DCIteratorBinding;
import oracle.adf.view.rich.component.rich.data.RichTable;

import oracle.adf.view.rich.context.AdfFacesContext;
import oracle.adf.view.rich.render.ClientEvent;

import oracle.jbo.Row;
import oracle.jbo.RowSetIterator;

import org.apache.myfaces.trinidad.model.CollectionModel;
import org.apache.myfaces.trinidad.model.RowKeySet;
import org.apache.myfaces.trinidad.model.RowKeySetImpl;

public class UsersTableBean {
    private RowKeySet selectedRows;
    private RichTable table;
    private static final String ITERATOR_NAME = "UsersVO1Iterator";

    public UsersTableBean() {
        super();
    }

    public void setSelectedRows(RowKeySet selectedRows) {
        this.selectedRows = selectedRows;
    }

    public RowKeySet getSelectedRows() {
        if (selectedRows == null) {
            selectedRows = new RowKeySetImpl();
            CollectionModel collectionModel =
                (CollectionModel)getTable().getValue();
            selectedRows.setCollectionModel(collectionModel);
        }

        return selectedRows;
    }

    public void setTable(RichTable table) {
        this.table = table;
    }

    public RichTable getTable() {
        return table;
    }

    public void rowSelected(ClientEvent clientEvent) {
        refreshSelectedRows();
        AdfFacesContext.getCurrentInstance().addPartialTarget(getTable());

    }

    public void selectAll(ValueChangeEvent valueChangeEvent) {
        DCIteratorBinding it = ADFUtils.findIterator(ITERATOR_NAME);
        RowSetIterator rit = it.getRowSetIterator();
        rit.reset();
        if (valueChangeEvent.getNewValue() != null) {
            Boolean selectAll =
                Boolean.parseBoolean(valueChangeEvent.getNewValue().toString());
            if (rit.first() != null) {
                Row r = rit.first();
                r.setAttribute("Selected", selectAll);
            }
            while (rit.hasNext()) {
                Row r = rit.next();
                if (r != null) {
                    r.setAttribute("Selected", selectAll);
                }
            }
        }

        refreshSelectedRows();
        it.executeQuery();
    }

    private void refreshSelectedRows() {
        getSelectedRows().clear();

        DCIteratorBinding it = ADFUtils.findIterator(ITERATOR_NAME);
        RowSetIterator rit = it.getRowSetIterator();
        rit.reset();

        if (rit.first() != null) {
            Row r = rit.first();
            if (r.getAttribute("Selected") != null) {
                makeRowSelected(r);
            }
        }
        while (rit.hasNext()) {
            Row r = rit.next();
            if (r.getAttribute("Selected") != null) {
                makeRowSelected(r);
            }
        }

    }

    private void makeRowSelected(Row r) {
        Boolean selected = (Boolean)r.getAttribute("Selected");
        if (selected) {
            ArrayList keyList = new ArrayList();
            keyList.add(r.getKey());
            getSelectedRows().add(keyList);
        }
    }

}

Step 01:

建立的 EO (Entity Objects): USERSEO 自行加入一個暫時記錄資料(transient attribute)的欄位 Selected , Type: Boolean, 因不需回寫 Table, 所以將屬性 Persistent 拿掉

Step 02: 建立一個檔案 tableCheckBoxSelect.jspx , 將 UserVO1 拖拉進來,並選轉換為ADF Table 物件

Section	Attribute	Value
Common	Id	t1
	rowSelection	multiple
Behavior	partialTriggers	selectAll
Advanced	binding	#{viewScope.UsersTableBean.table}
	selectedRowKeys	#{viewScope.UsersTableBean.selectedRows}