java 如何在列表中使用 PrimeFaces SelectOneMenu ItemLabel & ItemValue？
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How to use PrimeFaces SelectOneMenu ItemLabel & ItemValue with Lists?
提问by Jonathan
As far as im aware the correct way to display information in a SelectOneMenu is by having a list of objects and using it's properties like so:
据我所知，在 SelectOneMenu 中显示信息的正确方法是拥有一个对象列表并使用它的属性，如下所示：
<p:selectOneMenu id="player" value="">
<f:selectItem itemLabel="Select" itemValue="" />
<f:selectItems value="#{players}"
var="player"
itemLabel="#{player.name}"
itemValue="#{player.id}"/>
</p:selectOneMenu>
but what if I dont have a list of players, what if I have something like this? I'd like to get it to work like this:
但是如果我没有球员名单怎么办，如果我有这样的东西怎么办？我想让它像这样工作：
//PlayerManager
public List<String> getPlayerNames() {
String[] names = new String[] {"player1", "player2"};
return Arrays.asList(names);
}
public List<String> getPlayerIds() {
String[] ids = new String[] {"1", "2"};
return Arrays.asList(ids);
}
<p:selectOneMenu id="player" value="">
<f:selectItem itemLabel="Select" itemValue="" />
<f:selectItems value="#{playerManager.playerNames}"
var="player"
itemLabel="#{playerManager.playerNames}"
itemValue="#{playerManager.playerIds}"/>
</p:selectOneMenu>
回答by BalusC
Use <c:forEach>to generate <f:selectItem>components. You can use its varStatusattribute to get the current iteration index, so that you can get an item of the other list by index.
使用<c:forEach>产生<f:selectItem>的部件。可以使用它的varStatus属性来获取当前迭代索引，这样就可以通过索引获取其他列表的某一项。
<c:forEach items="#{playerManager.playerIds}" var="playerId" varStatus="loop">
<f:selectItem itemValue="#{playerId}" itemLabel="#{playerManager.playerNames[loop.index]}" />
</c:forEach>
Note that when the #{playerManager}is view scoped, this construct would then recreate the bean on every postback. See also JSTL in JSF2 Facelets... makes sense?
请注意，当#{playerManager}is 视图范围时，此构造将在每次回发时重新创建 bean。另请参阅JSF2 Facelets 中的 JSTL... 有意义吗？
