设置selectonemenu的默认值 [英] set default value for selectonemenu

问题描述

我有一个这样的选择菜单:

I have a select menu like this :

<h:selectOneMenu value="#{serverMB.selectedServerType}"  >
    <f:converter binding="#{serverTypeConverter}"/>
    <f:selectItems value="#{serverMB.serverTypesList}" var="servertypes"
            itemLabel="#{servertypes.server_type_name}" />
    <f:ajax listener="#{serverMB.changeSelectedOneMenuServerType}" render="selectservertype"/>
</h:selectOneMenu>

我希望选择菜单的默认值是以前填充的一个对象的值，如下所示:

I want the default value of the select menu to be the value of one object that has been filled before, something like this:

<h:selectOneMenu value="#{serverMB.selectedServerType}" default="serverMB.server.servertype">   // <- default

或类似这样:

<h:selectOneMenu value="#{serverMB.selectedServerType}">
    <f:converter binding="#{serverTypeConverter}"/>
    <f:selectItem value"serverMB.server.servertype"/> <-   but this item was the first one and has been selected  
    <f:selectItems value="#{serverMB.serverTypesList}" var="servertypes"
            itemLabel="#{servertypes.server_type_name}" />
</h:selectOneMenu>

推荐答案

如果在调用页面时已经填充了对象，则可以执行以下操作:如果没有，则将显示<f:selectItem/>消息:

You can do something like this if your object is already populated when you call the page, if it is not, it will show the <f:selectItem/> message:

<h:selectOneMenu value="#{serverMB.server.servertype}">
    <f:converter binding="#{serverTypeConverter}"/>
    <f:selectItem itemLabel="Select a Server..." />
    <f:selectItems value="#{serverMB.serverTypesList}" var="servertypes"
            itemLabel="#{servertypes.server_type_name}"/>
    <f:ajax listener="#{serverMB.changeSelectedOneMenuServerType}" 
            render="selectservertype"/>
</h:selectOneMenu>

这篇关于设置selectonemenu的默认值的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！