jsf - 如何将默认值设置为 <h :selectOneMenu>

Question

我正在尝试将默认值设置为 h:selectOneMenu。但是，它不起作用。

这是我的代码

index.xhtml

<h:body>
        <h:form id="test">
        <h:selectOneMenu value="#{selectMenuBean.selectedItem}"
                         title="select version"
                         onchange="submit()"
                         disabled="false" id="combo">

            <f:selectItems value="#{selectMenuBean.selectItems}" />
        </h:selectOneMenu>

        </h:form>
    </h:body>

BackingBean

private String selectedItem;
private List selectItems;
private int version=3;

public List getSelectItems() {

    List<Version> selectedItems = ExportDao.getVersionsList();
    System.out.println("List size: "+selectedItems.size());
    selectItems = new ArrayList();

    for (Version v1 : selectedItems) {
        String DATE_FORMAT = "yyyy-MM-dd HH:mm";
        //Create object of SimpleDateFormat and pass the desired date format.
        SimpleDateFormat sdf = new SimpleDateFormat(DATE_FORMAT);
        selectItems.add(new SelectItem(v1.getVersion(), "V" + v1.getVersion() + "/" + sdf.format(v1.getDate())));
        if(version = v1.getVersion()) // I have to check the version and set the matching version as selected.
        selectedItem = "V" + v1.getVersion() + "/" + sdf.format(v1.getDate());

    }
    return selectItems;
}

Answer 1

您正在使用项目标签而不是项目值设置 selectedItem。

替换

selectedItem = "V" + v1.getVersion() + "/" + sdf.format(v1.getDate());

通过

selectedItem = v1.getVersion();