How can I show/hide component with JSF?

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You can actually accomplish this without JavaScript, using only JSF’s rendered attribute, by enclosing the elements to be shown/hidden in a component that can itself be re-rendered, such as a panelGroup, at least in JSF2. For example, the following JSF code shows or hides one or both of two dropdown lists depending on the value of a third. An AJAX event is used to update the display:

<h:selectOneMenu value="#{workflowProcEditBean.performedBy}">
    <f:selectItem itemValue="O" itemLabel="Originator" />
    <f:selectItem itemValue="R" itemLabel="Role" />
    <f:selectItem itemValue="E" itemLabel="Employee" />
    <f:ajax event="change" execute="@this" render="perfbyselection" />
</h:selectOneMenu>
<h:panelGroup id="perfbyselection">
    <h:selectOneMenu id="performedbyroleid" value="#{workflowProcEditBean.performedByRoleID}"
                     rendered="#{workflowProcEditBean.performedBy eq 'R'}">
        <f:selectItem itemLabel="- Choose One -" itemValue="" />
        <f:selectItems value="#{workflowProcEditBean.roles}" />
    </h:selectOneMenu>
    <h:selectOneMenu id="performedbyempid" value="#{workflowProcEditBean.performedByEmpID}"
                     rendered="#{workflowProcEditBean.performedBy eq 'E'}">
        <f:selectItem itemLabel="- Choose One -" itemValue="" />
        <f:selectItems value="#{workflowProcEditBean.employees}" />
    </h:selectOneMenu>
</h:panelGroup>

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