java 如何将selectManyListbox中选择的数据存储到JSF中的列表中？
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How to store the data's selected in a selectManyListbox into a List in JSF?
提问by Hariharbalaji
I am having a selectmanyListbox component in my JSF, now i want to store the selected data's into a List. How to do this?
我的 JSF 中有一个 selectmanyListbox 组件，现在我想将选定的数据存储到一个列表中。这个怎么做？
回答by BalusC
As with every UIInputcomponent, you just have to bind the valueattribute with a property of the backing bean. Thus, so:
与每个UIInput组件一样，您只需要将value属性与支持 bean的属性绑定。因此，所以：
<h:form>
<h:selectManyListbox value="#{bean.selectedItems}">
<f:selectItems value="#{bean.selectItems}" />
</h:selectManyListbox>
<h:commandButton value="submit" action="#{bean.submit}" />
</h:form>
with the following in Beanclass:
在Bean课堂上有以下内容：
private List<String> selectedItems; // + getter + setter
private List<SelectItem> selectItems; // + getter only
public Bean() {
// Fill select items during Bean initialization/construction.
selectItems = new ArrayList<SelectItem>();
selectItems.add(new SelectItem("value1", "label1"));
selectItems.add(new SelectItem("value2", "label2"));
selectItems.add(new SelectItem("value3", "label3"));
}
public void submit() {
// JSF has already put selected items in `selectedItems`.
for (String selectedItem : selectedItems) {
System.out.println("Selected item: " + selectedItem); // Prints value1, value2 and/or value3, depending on selection.
}
}
If you want to use non-standard objects as SelectItemvalue (i.e. not a String, Numberor Booleanfor which EL has already builtin coercions), then you'll have to create a Converterfor this. More details can be found in this blog article.
如果您想使用非标准对象作为SelectItem值（即不是 a String，Number或者BooleanEL 已经内置强制转换），那么您必须为此创建 a Converter。可以在此博客文章中找到更多详细信息。
回答by Bozho
<h:selectManyListBox value="#{managedBean.list}">
<h:selectManyListBox value="#{managedBean.list}">
and in the managed bean:
并在托管 bean 中：
private List list;
(with the appropriate getter and setter, and if possible - using generics)
（使用适当的 getter 和 setter，如果可能 - 使用泛型）
