Table 组件使用指南：一次删除Table多行记录

运行环境：JDeveloper 11.1.2.1.0 + Oracle Database 10g Express Edition 10.2.0.1。

实验介绍：用户使用CheckBox选择要删除的行，点击按钮一次删除多行。
（1）主页面

（2）点击全选CheckBox

（3）删除选中的行

（4）如果没有选中行，会提示请选择


重点步骤说明：

1. 为View Object添加一个Transient字段: IsChecked，用于保存每行的选择状态


2. 修改页面中的IsChecked列：添加“全选/全不选”列头，转换OutputText为selectBooleanCheckbox。
（1）修改后的IsChecked列内容如下：

<af:column sortProperty="#{bindings.JobsView1.hints.IsChecked.name}" filterable="false"
           sortable="false" headerText="#{bindings.JobsView1.hints.IsChecked.label}" id="c1"
           width="30" minimumWidth="30" align="center">
    <af:selectBooleanCheckbox value="#{row.IsChecked}" id="sbc1"
                              label="#{row.bindings.IsChecked.label}"/>
    <f:facet name="header">
        <af:selectBooleanCheckbox id="selectAllCheckBox">
            <af:clientListener method="clickOnSelectAllCheckBox" type="valueChange"/>
            <af:serverListener type="SelectAllCheckBoxClickEvent"
                               method="#{backingBeanScope.myBackingBean.handleSelectAllCheckboxClick}"/>
        </af:selectBooleanCheckbox>
    </f:facet>
</af:column>

（2）clientListener调用的javascript函数
<af:resource type="javascript" source="js/table_function.js"/>
其中包含clickOnSelectAllCheckBox函数：

function clickOnSelectAllCheckBox(evt) {
    var selectAllCheckBox = evt.getSource();
    var isChecked = selectAllCheckBox.getValue();
    AdfCustomEvent.queue(selectAllCheckBox, "SelectAllCheckBoxClickEvent", {params : isChecked},false);
}

（3）把Table绑定到Managed Bean中的一个属性
binding="#{backingBeanScope.myBackingBean.jobsTable}"

（1）（2）（3）组合在一起，实现了“全选/全不选”功能。原理如下：
当“全选/全不选”CheckBox上发生valueChange事件发生时，监听该事件的clientListener触发了javascript方法：clickOnSelectAllCheckBox，该方法向事件队列中同步地（true参数表示异步，false表示同步）压入一个事件：SelectAllCheckBoxClickEvent，监听该事件的serverListener触发了Managed Bean中的方法handleSelectAllCheckboxClick。

3. 为Table增加行号
在第一列之前，增加一列，作为行号。

<af:column id="c6" headerText="No." width="30" minimumWidth="30" align="center">
   <af:outputText value="#{vs.index+1}" id="ot1"/>
</af:column>

4. Managed Bean完整代码

package view;

import javax.faces.context.FacesContext;

import javax.faces.event.ActionEvent;

import oracle.adf.model.BindingContext;
import oracle.adf.model.binding.DCBindingContainer;
import oracle.adf.model.binding.DCIteratorBinding;
import oracle.adf.view.rich.component.rich.data.RichTable;
import oracle.adf.view.rich.event.DialogEvent;
import oracle.adf.view.rich.render.ClientEvent;

import oracle.binding.BindingContainer;
import oracle.binding.OperationBinding;

import oracle.jbo.Row;
import oracle.jbo.RowSetIterator;
import oracle.jbo.ViewObject;
import oracle.jbo.uicli.binding.JUCtrlHierNodeBinding;

import org.apache.myfaces.trinidad.render.ExtendedRenderKitService;
import org.apache.myfaces.trinidad.util.Service;

import view.util.ADFUtils;

public class MyBackingBean {
    public MyBackingBean() {
        super();
    }

    private RichTable jobsTable;
   
    public void handleSelectAllCheckboxClick(ClientEvent clientEvent) {
        boolean isSelectAllChecked = (Boolean)clientEvent.getParameters().get("params");
        RichTable rt = this.getJobsTable();
        for (int i = 0; i < rt.getRowCount(); i++) {
            JUCtrlHierNodeBinding rowData = (JUCtrlHierNodeBinding)rt.getRowData(i);
            Row row = rowData.getRow();
            row.setAttribute("IsChecked", isSelectAllChecked);
        }
    }

    public void deleteButton_actionListener(ActionEvent actionEvent) {
        if (isMoreThanOneRowSelected()) {
            FacesContext facesContext = FacesContext.getCurrentInstance();
            ExtendedRenderKitService service =
                Service.getRenderKitService(facesContext, ExtendedRenderKitService.class);
            service.addScript(facesContext, "AdfPage.PAGE.findComponent('popupDelete').show();");
        } else {
            FacesContext facesContext = FacesContext.getCurrentInstance();
            ExtendedRenderKitService service =
                Service.getRenderKitService(facesContext, ExtendedRenderKitService.class);
            service.addScript(facesContext, "AdfPage.PAGE.findComponent('popupNoRowSelected').show();");
        }
    }

    public boolean isMoreThanOneRowSelected() {
        boolean isMoreThanOne = false;
        DCIteratorBinding dcIterator = ADFUtils.findIterator("JobsView1Iterator");
        ViewObject vo = dcIterator.getViewObject();
        for (int i = 0; i < vo.getEstimatedRowCount(); i++) {
            Row row = dcIterator.getRowAtRangeIndex(i);
            String isSelected = row.getAttribute("IsChecked").toString();
            if ((isSelected != null) && Boolean.parseBoolean(isSelected)) {
                isMoreThanOne = true;
                break;
            }
        }
        return isMoreThanOne;
    }


    public void deleteDialogListener(DialogEvent dialogEvent) {
        if (dialogEvent.getOutcome().equals(DialogEvent.Outcome.ok)) {
            doDelete();
        }
    }

    private void doDelete() {
        DCIteratorBinding dcIterator = ADFUtils.findIterator("JobsView1Iterator");
        RowSetIterator rsi = dcIterator.getRowSetIterator().getRowSet().createRowSetIterator("deleteRowsRSI");
        rsi.reset();
        while (rsi.hasNext()) {
            Row row = rsi.next();
            String isSelected = row.getAttribute("IsChecked").toString();
            if ((isSelected != null) && Boolean.parseBoolean(isSelected)) {
                row.remove();
            }
        }
        rsi.closeRowSetIterator();

        OperationBinding operb = ADFUtils.findOperation("Commit");
        operb.execute();
    }

    public void setJobsTable(RichTable jobsTable) {
        this.jobsTable = jobsTable;
    }

    public RichTable getJobsTable() {
        return jobsTable;
    }
}

5. popupDelete和popupNoRowSelected是由程序控制弹出的
重要的属性说明如下：
contentDelivery="lazy"，因为每次弹出的内容都相同，因此使用延迟装载，且使用Cache。

<af:popup id="popupDelete" autoCancel="disabled" childCreation="deferred" contentDelivery="lazy">
    <af:dialog id="dialogDelete" title="Delete Confirm"
               dialogListener="#{backingBeanScope.myBackingBean.deleteDialogListener}">
        <af:outputText value="The record will be delete,are you sure ?" id="ot6"/>
    </af:dialog>
</af:popup>
<af:popup id="popupNoRowSelected" autoCancel="disabled" childCreation="deferred" contentDelivery="lazy">
    <af:dialog id="dialogNoRowSelected" type="ok" title="No Row Selected">
        <af:outputText value="Please Select At Least One Row To Be Deleted." id="ot7"/>
    </af:dialog>
</af:popup>