java - 获取选定的LOV值并在其他字段中显示相应的数据

Question

表:项目

列:

  ItemNumber,
  Description

transient 属性1: 项目

在显示项目编号的项目上创建 LOV

transient 属性2:

 ItemsDescription-This should display Description of above item selected.Added following code on Attribute 2:


    if(ItemNumber!=null)
       { oracle.jbo.Key keyVal=new oracle.jbo.Key(ItemNumber); 
         return ItemVO1.findByKey(keyVal,1)[0].getAttribute("Description"); 
       } 
      else
         {
             return null; }

需要在属性2列上显示描述

Answer 1

据我了解，您的要求是:

您需要根据 ADF 中 LOV 中的项目编号选择来显示项目描述。

项目描述和项目编号都是 transient 字段。

我使用的是 ADF 11g。

我没有任何与项目相关的表格。所以我对 Emp 表本身使用了 2 个 VO。

   - One is base EmpVO
   - Second is LOV VO (empObjVO)

表:员工

    - emp_id
    - emp_name
    - item_emp_id ( Transient variable - LOV - based on emp_id)
    - item_emp_desc (Output Transient variable - Output text - On selection of LOV)

empObjVO - 包含

     - emp_id ( This column is list for item_emp_id)
     - emp_name (This column will be description for selection of emp_id)

EmpVo

     - item_emp_id has LOV of empObjVO1 with List Attribute and UI display attribute both.
      ( As you told item number is displayed in LOV. consider emp_id as item_number here).

       List type is choice list.

完成上述配置后，将item_emp_id和item_emp_desc放置在jsff页面中，分别作为选择一项和输出文本。

页面中的item_emp_id定义:

       <af:selectOneChoice value="#{bindings.item_emp_id.inputValue}"
                    label="#{bindings.item_emp_id.label}"
                    required="#{bindings.item_emp_id.hints.mandatory}"
                    shortDesc="#{bindings.item_emp_id.hints.tooltip}"
                    id="soc3"  autoSubmit="true"
                    valueChangeListener="#{bean1.changeVal}">
  <f:selectItems value="#{bindings.item_emp_id.items}" id="si3"/>
</af:selectOneChoice>

为其设置autosubmit=true。

创建 ValueChangeEventListner 并在 bean 中创建一个方法，以在 LOV 中的值发生更改时触发。item_emp_desc 定义是:

    <af:outputText value="#{bindings.item_emp_desc.inputValue}" id="ot1"
               partialTriggers="soc3"/>

使用部分触发器作为soc3，因为它依赖于soc3。

public void changeVal(ValueChangeEvent vce) {
    // Add event code here...
    Integer selectedCode=null;
   //As we get indexes not value of LOV so need to map selected index with value.

    if (vce.getNewValue() != null) {
        this.setvalueToExpression("#{bindings.item_emp_id.inputValue}",
                                  vce.getNewValue()); //Updating Model Values
         selectedCode =
            Integer.parseInt(this.getValueFrmExpression("#{bindings.item_emp_id.attributeValue}").toString());

        System.out.println("******** Selected Value in List***** " +
                           selectedCode);
        System.out.println("*******Display Value in List ****" +
                           getValueFrmExpression("#{bindings.item_emp_id.selectedValue.attributeValues[1]}"));
    }

    String e_id=selectedCode.toString(); //It will contain selected item_emp_id
    DCBindingContainer bindings =
    (DCBindingContainer)BindingContext.getCurrent().getCurrentBindingsEntry();
    DCIteratorBinding dcIteratorBindings =
    bindings.findIteratorBinding("EmpView1Iterator"); // Base table Emp VO iterator
    DCIteratorBinding dcIteratorBindings1 =
    bindings.findIteratorBinding("empViewObj1Iterator"); // LOV table Emp Vo iterator
    ViewObject vo = dcIteratorBindings.getViewObject();
    ViewObject vo1 = dcIteratorBindings1.getViewObject();
    Row  r1 = vo.getCurrentRow(); // get current row of base table VO


    vo1.setWhereClause("e_id = " + e_id); // set where clause to get the description from LOV in VO1
    vo1.executeQuery(); //execute it.
    if(vo1.hasNext())
    {
    Row r=vo1.next(); // Get the row from LOV VO

    if(r!=null)
    {
       r1.setAttribute("item_emp_desc", r.getAttribute("EmpName")); //set it to item_emp_desc which is a transient variable for output.
    }
    }

}


    public void setvalueToExpression(String el, Object val) {
        FacesContext facesContext = FacesContext.getCurrentInstance();
        ELContext elContext = facesContext.getELContext();
        ExpressionFactory expressionFactory = facesContext.getApplication().getExpressionFactory();
        ValueExpression exp = expressionFactory.createValueExpression(elContext, el, Object.class);
        exp.setValue(elContext, val);
    }


 public String getValueFrmExpression(String data) {
FacesContext fc = FacesContext.getCurrentInstance();
Application app = fc.getApplication();
ExpressionFactory elFactory = app.getExpressionFactory();
ELContext elContext = fc.getELContext();
ValueExpression valueExp = elFactory.createValueExpression(elContext, data, Object.class);
String Message = null;
Object obj = valueExp.getValue(elContext);
        if (obj != null) {
Message = obj.toString();
        }
        return Message;
    }

为了理解索引到值的转换，我引用了

 [http://www.awasthiashish.com/2014/05/getting-selected-value-not-index-display-value-of-select-one-choice-programmatically-in-adf.html][1]

它可能对你有帮助。