如何访问jsf selectOneMenu中选定的标签和选定的描述，其中selectOneMenu与javax.faces.model.SelectItem对象绑定？

发布于 2024-12-08 13:24:02 字数 1300 浏览 0 评论 0原文

这是针对 JSF 2.0 的（请注意 - 这是 mojerra 实现，我没有使用 Icefaces、myfaces 等）。

考虑我的表单中只有一个下拉菜单，并且该下拉菜单与存储值的 SelectItems 对象列表绑定，标签和说明。

在我的值更改操作侦听器事件中，如何访问选定的值、标签和描述。我只能访问选定的值吗？

示例代码 -

在我的 xhtml 中 - 下拉菜单是 -

<h:selectOneMenu onchange="submit()" valueChangeListener="#{person.changeDD}" value="#{person.selectedValue}">
    <f:selectItems value="#{person.lists}"></f:selectItems>
</h:selectOneMenu>

的名称 -

其中 person 是 bean ModelBean

@ManagedBean(name="person")
@SessionScoped
public class PersonBean implements Serializable{

private String selectedValue;

private List<SelectItem> lists=new ArrayList<SelectItem>(); 
public PersonBean() {
        lists=new ArrayList<SelectItem>();
        lists.add(new SelectItem("1","India","desc1"));
        lists.add(new SelectItem("2","canada","desc2"));
        lists.add(new SelectItem("3","america","desc3"));
    }
//getters and setters


public void changeDD(ValueChangeEvent vce) throws IOException{
        System.out.println("in value change");
        System.out.println("New value-->"+vce.getNewValue().toString());
//I have access only to the selected value and not to the description and label

    }
}

请帮助

原文

This is for JSF 2.0 (Kindly note - this is mojerra implementation and I am not using Icefaces, myfaces etc.)

Consider I just have a drop down in my my form and the dropdown is bound with a List of SelectItems objects which stores value,label and description.

In my Value change actionlistener event how can I access the selected value,label and description. I am able to access only the selected value?

Sample code-

In my xhtml - the dropdown is -

<h:selectOneMenu onchange="submit()" valueChangeListener="#{person.changeDD}" value="#{person.selectedValue}">
    <f:selectItems value="#{person.lists}"></f:selectItems>
</h:selectOneMenu>

where person is the name of the bean

ModelBean-

@ManagedBean(name="person")
@SessionScoped
public class PersonBean implements Serializable{

private String selectedValue;

private List<SelectItem> lists=new ArrayList<SelectItem>(); 
public PersonBean() {
        lists=new ArrayList<SelectItem>();
        lists.add(new SelectItem("1","India","desc1"));
        lists.add(new SelectItem("2","canada","desc2"));
        lists.add(new SelectItem("3","america","desc3"));
    }
//getters and setters


public void changeDD(ValueChangeEvent vce) throws IOException{
        System.out.println("in value change");
        System.out.println("New value-->"+vce.getNewValue().toString());
//I have access only to the selected value and not to the description and label

    }
}

Kindly help

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别理我 2024-12-15 13:24:02

在我的值更改操作侦听器事件中，如何访问选定的值、标签和描述。我只能访问选定的值？

这实际上也只能由 HTML

@ManagedBean(name="person")
@SessionScoped
public class PersonBean implements Serializable {

    private String selectedValue;
    private Map<String, SelectItem> availableValues;
    private List<SelectItem> lists; 

    public PersonBean() {
        availableValues = new LinkedHashMap<String, SelectItem>();
        availableValues.put("1", new SelectItem("1", "India", "desc1"));
        availableValues.put("2", new SelectItem("2", "canada", "desc2"));
        availableValues.put("3", new SelectItem("3", "america", "desc3"));
        lists = new ArrayList<SelectItem>(availableValues.values());
    }

    public void changeDD(ValueChangeEvent event) {
        String selectedValue = (String) event.getNewValue();
        SelectItem selectedItem = availableItems.get(newValue);
        // ...
    }

}

In my Value change actionlistener event how can I access the selected value,label and description. I am able to access only the selected value?

That's indeed also only what's been sent by a HTML <select> element.
You need to maintain a mapping of the available values and SelectItems yourself.

@ManagedBean(name="person")
@SessionScoped
public class PersonBean implements Serializable {

    private String selectedValue;
    private Map<String, SelectItem> availableValues;
    private List<SelectItem> lists; 

    public PersonBean() {
        availableValues = new LinkedHashMap<String, SelectItem>();
        availableValues.put("1", new SelectItem("1", "India", "desc1"));
        availableValues.put("2", new SelectItem("2", "canada", "desc2"));
        availableValues.put("3", new SelectItem("3", "america", "desc3"));
        lists = new ArrayList<SelectItem>(availableValues.values());
    }

    public void changeDD(ValueChangeEvent event) {
        String selectedValue = (String) event.getNewValue();
        SelectItem selectedItem = availableItems.get(newValue);
        // ...
    }

}

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酷到爆炸 2024-12-15 13:24:02

~~您可以通过为它们添加变量并为变量创建 getter 和 setter 来实现这一点~~

在您的 bean 中，例如。对于在您的 bean 中创建的描述
private String description; public String getDescription(){ return description; } public void setDescription(String desc){ description = desc; }

~~以及类似的任何变量。~~

抱歉，我误解了

您可以做的

//String selectedvalue
SelectItem selectedValue;//create getters setter
public void changeDD(ValueChangeEvent vce) throws IOException{
    System.out.println("in value change");
    System.out.println("New value-->"+vce.getNewValue().toString());
    String description = selectedValue.getDescription();

}
}

~~you can do that by having variables for them and creating getters and setters for the variables~~

in your bean for eg. for the description create in your bean
private String description; public String getDescription(){ return description; } public void setDescription(String desc){ description = desc; }

~~and similarly for any variable.~~

Sorry i misunderstood

you can do

//String selectedvalue
SelectItem selectedValue;//create getters setter
public void changeDD(ValueChangeEvent vce) throws IOException{
    System.out.println("in value change");
    System.out.println("New value-->"+vce.getNewValue().toString());
    String description = selectedValue.getDescription();

}
}

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