JSF复合按钮重新启动视图范围的托管bean

时间:2011-06-29 08:57:00

标签: jsf listener composite-component

只要封装了commandButton的复合包含在我的.xhtml中,无论使用哪个commandButton,都会重新初始化viewscoped bean。我的复合错了吗?请告诉我,因为我真的想在我的按钮上使用复合材料 简单的测试用例:

@ManagedBean
@ViewScoped
public class Test implements Serializable {
private static final long serialVersionUID = 123456L;
private static int i = 0;
private int counter;
private String table;
private transient DataModel<String> model;

@PostConstruct
public void test() {
    System.out.println(".......... PostConstruct");
    i++;
    List<String> modelData = new ArrayList<String>();
    modelData.add("hello");
    modelData.add("world");
    model = new ListDataModel<String>(modelData);
}


public int getCounter() {
    return counter;
}

public String getTable() {
    return table;
}

public DataModel<String> getModel() {
    return model;
}

public void tableListener() {
    String data = model.getRowData();
    table = data.toUpperCase();
}

}

无论点击哪个按钮(第2列或第3列),都会一遍又一遍地调用postConstruct方法

    <h:form>
        <h:dataTable style="width: 40em" var="line" value="#{test.model}">
            <h:column>
                <f:facet name="header">string</f:facet>
                #{line}
            </h:column>
            <h:column>
                <f:facet name="header">actie...1</f:facet>
                <h:commandButton value="toUpper" immediate="true"  >
                    <f:ajax event="click" execute="@form" render=":testTable" listener="#{test.tableListener}" />
                </h:commandButton>
            </h:column>
            <h:column>
                <f:facet name="header">actie...2</f:facet>
                <cmp:rowAction managedBean="#{test}" label="button" listener="tableListener"
                               tooltip="test via composite" img="stop.png" render=":testTable"/>
            </h:column>
        </h:dataTable>
    </h:form>

一旦删除了最后一列(标题actie ... 2),则只按预期调用@PostConstruct一次。

为什么我的复合力的存在重新初始化视图的bean?我的复合有什么问题,它有效,但它不应该重新初始化托管bean:

<?xml version='1.0' encoding='UTF-8' ?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"
  xmlns:cc="http://java.sun.com/jsf/composite"
  xmlns:h="http://java.sun.com/jsf/html"
  xmlns:f="http://java.sun.com/jsf/core">

<!-- INTERFACE -->
<cc:interface>
    <cc:attribute name="label" required="true"/>
    <cc:attribute name="render"/>
    <cc:attribute name="tooltip"/>
    <cc:attribute name="img"/>
    <cc:attribute name="listener" required="true"/>
    <cc:attribute name="managedBean" required="true"/>
</cc:interface>

<!-- IMPLEMENTATION -->
<cc:implementation>
    <h:commandButton  id="btn_#{cc.attrs.label}" title="#{cc.attrs.tooltip}" immediate="true"
                      image="/resources/img/#{cc.attrs.img}">
        <f:ajax event="click" execute="@form" render="#{cc.attrs.render}" listener="#{cc.attrs.managedBean[cc.attrs.listener]}" />
    </h:commandButton>
</cc:implementation>

1 个答案:

答案 0 :(得分:1)

根据这篇文章,JSF 2 - How can I add an Ajax listener method to composite component interface?我找到了解决方案。问题是声明属性cc:attribute name="listener" required="true"/>的声明应该是cc:attribute name="listener" method-signature="void listener()" required="true"/>

在前面提到的帖子中,BalusC还提到了一个(在我的情况下是次要的)问题:我不能使用AjaxBehvaiorEvent。我正在使用Netbeans 6.9.1,Gfish3.1和Mojarra2.1.1