Question

我对JSF很新.2。我正在尝试使用Ajax渲染组件，具体取决于用户选择的复选框。例如，选中框1，框2和框3。

每当我选择一个复选框时，我都会遇到一些错误。

错误讯息：

serverError: class javax.faces.component.UpdateModelException/ajaxcall.xhtml@27,
54 value="#{bean.panels}": Property 'panels' not writable on type java.util.List

以下是我的XHTML代码。

<?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:h="http://java.sun.com/jsf/html"
      xmlns:f="http://java.sun.com/jsf/core"
      xmlns:ui="http://java.sun.com/jsf/facelets"
>
    <h:head><title>JSF 2.0: Blank Starting-Point Project</title>
    </h:head>

    <h:body>
        <h:panelGroup id="panels">
            <h:panelGroup rendered="#{bean.panels.contains('u1')}">
                panel one
            </h:panelGroup>
            <h:panelGroup rendered="#{bean.panels.contains('u2')}">
                panel two
            </h:panelGroup>
            <h:panelGroup rendered="#{bean.panels.contains('u3')}">
                panel three
            </h:panelGroup>
        </h:panelGroup>

        <h:form>
            <h:selectManyCheckbox value="#{bean.panels}">
                <f:selectItem itemValue="u1" />
                <f:selectItem itemValue="u2" />
                <f:selectItem itemValue="u3" />
                <f:ajax render=":panels" />
            </h:selectManyCheckbox>
        </h:form>
    </h:body>
</html>

这是我的豆子：

package somePackage;

import java.util.ArrayList;
import java.util.List;

import javax.faces.bean.ManagedBean;
import javax.faces.bean.RequestScoped;

@ManagedBean
@RequestScoped
public class Bean {
    private List<String> panels = new ArrayList<String>();

    public List<String> getPanels() {
        return panels;
    }
}

我错过了什么吗？

Answer 1

错误有点误导，但你也需要一个setter。

public void setPanels(List<String> panels) {
    this.panels = panels;
}

使用Ajax调用基于请求参数更新部件的JSF 2出错

1 个答案: