对带有转换器的对象的selectonemenu jsf [英] selectonemenu jsf on objects with converter

问题描述

这是我的SelectOneMenu

Here is my SelectOneMenu

<h:selectOneMenu value="#{bean.myObject}" >
    <f:ajax render="componentToRender" listener="#{bean.onSelect}"/>
    <f:converter converterId="myObjectConverter" />
    <f:selectItem itemLabel="None" itemValue="#{null}" />
    <f:selectItems value="#{bean.objects}" var="object" itemValue="#{object}" itemLabel="#{object.name}" />
</h:selectOneMenu>

还有我的转换器

@FacesConverter("myObjectConverter")
public class MyObjectConverter implements Converter{

    private List<MyObject> objects;

    public MyObjectConverter(){
        this.objects = MyController.getAllMyObjects();
    }

    public Object getAsObject(FacesContext context, UIComponent component, String value) {
        if(!StringUtils.isInteger(value)) {
            return null;
        }
        return this.getMyObject(value);
    }

    public String getAsString(FacesContext context, UIComponent component, Object value) {
        if(value == null) {
            return null;
        }
        return String.valueOf(((MyObject) value).getId()).toString();
    }

    public MyObject getMyObject(String id) {
        Iterator<MyObject > iterator = this.objects.iterator();
        while(iterator.hasNext()) {
            MyObject object = iterator.next();

            if(object.getId() == Integer.valueOf(id).intValue()) {
                return object;
            }
        }
        return null;
    }

}

问题在于我的Ajax监听器从未被调用，而我的组件也从未被呈现. 我的转换器或selectOneMenu出问题了吗?我举了一个例子，但我无法弄清楚错误.

The problem is that my ajax listener is never called and my component never rendered. Is there something wrong with my converter or selectOneMenu? I follow an example and I can't figure the mistake out.

顺便说一句:我在bean中的简单方法

BTW : my simple method in the bean

public void onSelect() {
    System.out.println(this.myObject);
    if(this.myObject != null) {
        System.out.println(this.myObject.getName());
    }
}

我已经遇到了这样的问题，我将选择的值从object更改为id.但是在这里，我想使其与对象一起使用，因为我知道这是可能的.

I already had a problem like this and I changed my selected value from object to id. But here I want to make it work with objects because I know it's possible.

谢谢

推荐答案

我有解决方法.我必须重写MyObject类中的等于"方法！

I have the solution. I had to override the "equals" method in MyObject class!

谢谢.

代码

@Override
public boolean equals(Object obj) {
    if(this.id == ((MyObject) obj).id) {
        return true;
    }else {
        return false;
    }
}

这篇关于对带有转换器的对象的selectonemenu jsf的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！