How to get a value of a text field or a bean member in a JSP tag?

[Efrat Bar-Nahum]

Hi,

I have a JSF page with 2 outputText fields.
I want the second one to appear only if the first has a certain value.

It should be something like:

  <tr>
        <td><h :-o	 utputText value="#{msgs.alarmState}:"/></td>
        <td><h :-o	 utputText id="alarmState" value="#{ModuleBean.alarmState}"/></td>
  </tr>
 
<% if (alarmState.value != "OK") { %> 
  <tr>
        <td><h :-o	 utputText value="#{msgs.mostSevereAlarm}:"/></td>
        <td><h :-o	 utputText id="mostSevereAlarm" value="#{ModuleBean.mostSevereAlarm}"/></td>
  </tr>
<% } %>

But I don't know how to get a value of a JSF field, or a value of a java bean member in a JSP tag (that is not bind to a field in the page), like the example above.

Can anyone help me?
Thanks,
Efrat

[Bagwan Mehrat]

It might not be the best practice when using JSF, but in that situation, I know you can do something like:

<jsp:useBean id="alarm" class="com.mycompany.ModuleBean" scope="session"/>

That will make the JSP look up the JSF managed bean object and give you direct access to it. You'd need to set the class and scope parameters to match what you have in your faces-config file. Or, you can even do it the messier way by writing a scriptlet that does the equivalent of the above.

[Abhi Raj]

Try this:


<h outputText value="#{msgs.alarmState}:"/
<h outputText id="alarmState" value="#{ModuleBean.alarmState}"/>

<h outputText value="#{msgs.mostSevereAlarm}:"
rendered=#{alarmState.value != 'OK'}" />
<h outputText id="mostSevereAlarm" value="#ModuleBean.mostSevereAlarm}"
rendered=#{alarmState.value != 'OK'}" />


I think it should work.

[Efrat Bar-Nahum]

Thanks a lot, The rendering idea worked!
I rendered the bean value as follows:

<h :-o	 utputText value="#{msgs.mostSevereAlarm}:" 
              rendered='#{ModuleBean.alarmState != "OK"}'/>
<h :-o	 utputText id="mostSevereAlarm" value="#{ModuleBean.mostSevereAlarm}"
              rendered='#{ModuleBean.alarmState != "OK"}'/>

Thanks again for the help,
Efrat

[Gerardo Tasistro]

Since you're controling more than one component you might want to look into the <f:subview>

For example

<h outputText value="#{msgs.alarmState}:"/
<h outputText id="alarmState" value="#{ModuleBean.alarmState}"/>

<f:subview id="onAction" rendered="#{alarmState.value != 'OK'}">
<h outputText value="#{msgs.mostSevereAlarm}" />
<h outputText id="mostSevereAlarm" value="#ModuleBean.mostSevereAlarm}" />

</f:subview>

That way you don't need to put a render tag on ever item.

[Efrat Bar-Nahum]

Great!
Thanks a lot for the tip.

Efrat