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我是 ADF 的新手并面临一些问题：我的af:selectOneChoice页面中有一个组件，其中包含数据列表。

当用户从组件列表中选择一个选项时，我想获得选定的值selectOnceChoice。

我使用了带参数的请求 bean，并将其绑定在组件属性检查器的 value 选项中，但它未能给出所选值。如何从selectOneChoice组件中获取选定的值？

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5 回答 5

3

您可以使用ValueChangeListener组件selectOnceChoice。您可以将其绑定到valueChangeListenerbean 类方法并调用 API 以获取selectOnceChoice组件的新值或旧值：

public void selectOnceChoiceValue(ValueChangeEvent valueChangeEvent){
    if(valueChangeEvent != null) {
        Object newVal = valueChangeEvent.getNewValue();
        Object oldVal = valueChangeEvent.getOldValue();
    }
}
<af:selectOneChoice id="soc1" simple="true" autoSubmit="true"
   valueChangeListener="#{ExtnEmailNotificationPFBean.recipientTypeValue}"
   label="#{''}"
   binding="#{ExtnEmailNotificationPFBean.recipientTypeValue}"
   partialTriggers="cl2"
   value="#{pageFlowScope.ZcxEaNotificationRecipientType}">
  <f:selectItems id="si4"
          value="#{pageFlowScope.ZcxEaRecipientsTypeValueList}"/>                  
</af:selectOneChoice>
于 2011-09-12T08:29:22.343 回答
1

根据您需要对值执行的操作，一个选项是支持 bean 中的以下方法

public void valueChanged(ValueChangeEvent valueChangeEvent) {
    this.setValueToEL("#{bindings.Deptno.inputValue}", valueChangeEvent.getNewValue()); //Updates the model
    System.out.println("\n******** Selected Value: "+resolveExpression("#{bindings.Deptno.attributeValue}"));
    System.out.println("\n******** Display Value: "+resolveExpression("#{bindings.Deptno.selectedValue ne ' ' ? bindings.Deptno.selectedValue.attributeValues[1] : ''}"));
}

public Object resolveExpression(String el) {      
    FacesContext facesContext = FacesContext.getCurrentInstance();
    ELContext elContext = facesContext.getELContext();
    ExpressionFactory expressionFactory =  facesContext.getApplication().getExpressionFactory();        
    ValueExpression valueExp = expressionFactory.createValueExpression(elContext,el,Object.class);
return valueExp.getValue(elContext);
}

public void setValueToEL(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);
}

你的 JSP 组件应该看起来像

<af:selectOneChoice value="#{bindings.Deptno.inputValue}" label="Select Department"
                            required="true" shortDesc="#{bindings.Deptno.hints.tooltip}"
                            id="soc1" autoSubmit="true">
          <f:selectItems value="#{bindings.Deptno.items}" id="si1"/>
</af:selectOneChoice>

来自http://blogs.oracle.com/adf/entry/getting_selected_value_from_selectonechoice

如果您正在寻找更多与支持您想要查看的组件的视图对象的连接，这将为您提供实时显示的文本。

public void buttonPressed(ActionEvent actionEvent) {

    // Get the binding
    BindingContainer bindings =
    BindingContext.getCurrent().getCurrentBindingsEntry();
    // Get the sepecific list binding
    JUCtrlListBinding listBinding =
    (JUCtrlListBinding)bindings.get("DepartmentId");
    // Get the value which is currently selected
    Object selectedValue = listBinding.getSelectedValue();
    System.out.println(selectedValue);
}

来自http://blogs.oracle.com/shay/entry/getting_the_value_from_a_selec

于 2012-02-06T17:58:44.290 回答
0

If I got it right, your problem is that value, you have selected with af:selectOneChoice will be available at bean, only after submit. If thats the case, then you should either let user submit the form, or set autoSubmit property of component to true.

于 2012-08-11T02:36:35.880 回答
0

这应该这样做：

<af:selectOneChoice id="sampleId" 
value="#{bindings.sampleAttribute.inputValue}"
label="#{bindings.sampleAttribute.label}"
valueChangeListener=#"{Bean.valueChangeListener}"
immediate="true" autoSubmit="true">
    <f:selectItems id="sampleAttributeValues"
    value="#{bindings.sampleAttribute.items}"/>
</af:selectOneChoice>

豆子会有：

public void valueChangeListener(ValueChangeEvent valueChangeEvent)
{
    FacesContext.getCurrentInstance().renderResponse();  
}
于 2012-12-14T18:20:50.447 回答
0

如果您将 autoSubmit 属性设置为“true”，请确保也将立即数设置为“true”。否则，将在页面级别触发验证。

于 2012-12-16T11:33:03.597 回答