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RickoT1031RickoT1031 

RE: apex:param not working?

So I am trying to assign a value to a property in my controller and it just is not working, the value always ends up as null... am I doing somethign wrong?

 

In My Controller

    public Boolean blnDoAttachment{get; set;}  
 
 <<Some Code>>
 
 if (blnDoAttachment == True){
return new PageReference('p/attach/NoteAttach?pid=/' + c.id + 'retURL=' + c.id); 
 
} 
if (blnDoAttachment == False){
return new PageReference('/'+ c.id);
}
return null;
 
On My VisualForce Page
<apex:commandButton action="{!save}" value="Submit"><apex:param value="False" assignto="{!blnDoAttachment}"/></apex:commandButton>
<apex:commandButton action="{!save}" value="Submit and Attach"><apex:param value="True" assignto="{!blnDoAttachment}"/></apex:commandButton>
Any assistance would be greatly appreciated.  I am pretty sure its just something totally stupid on my part
 
Thanks!
 
Message Edited by RickoT1031 on  03-09-2010 04:27 PM


visualforce_devvisualforce_dev
Hi,
 
Even I faced the same issue. Param is working fine for commandlink not well for button.. afterall i put commandlink and using style i displayed it as button 


NZ_XueNZ_Xue
try this way and then let me konw if it works:
 
 
<apex:commandButton action="{!save}" value="Submit" rerender="hidden"><apex:param value="False" assignto="{!blnDoAttachment}"/></apex:commandButton>
<apex:commandButton action="{!save}" value="Submit and Attach" rerender="hidden"><apex:param value="True" assignto="{!blnDoAttachment}"/></apex:commandButton>

<apex:pageBlock id="hidden" rendered="false"></apex:pageBlock>


 
 
 
 


NZ_XueNZ_Xue
i just put your code into a pageBlock and set rerender="block" for CommandButton and then it works.
 
 i can get parameter in APEX code. but i do not find a way without add a pageBlock tag.
 
 
<apex:page standardController="Contact" extensions="CommandButtonParamController">
    <apex:form >
      <apex:pageBlock mode="edit" id="block" >

       <apex:commandButton action="{!save}" value="Submit"   rerender="block" ><apex:param  value="False" assignto="{!blnDoAttachment}"/></apex:commandButton>
       <apex:commandButton action="{!save}" value="Submit and Attach" rerender="block"><apex:param  value="True" assignto="{!blnDoAttachment}"/></apex:commandButton>
   
<!-- i can see the value in a outputLabel changed between True and False when i click the buttons.get set methods are work -->

    
  <apex:outputLabel value="{!blnDoAttachment}"> </apex:outputLabel>
         
  </apex:pageBlock>   
 </apex:form>
</apex:page>
 
 
 
 
 
 
 
 


Rajesh ShahRajesh Shah
There is some problem with the param tag and command button. Check the below link for details and the solution:
http://blog.jeffdouglas.com/2010/03/04/passing-parameters-with-a-commandbutton/ 


RickoT1031RickoT1031
Awesome guys thanks for the quick response, that was perfection!


d3developerd3developer
I don't think Jeff highlights this, but you need to include the name element.
 
name = "randomNickName" 


Brendan Walton 9Brendan Walton 9
I would like to add, In Jeff's post he says you must use a hidden pageBlock which is not true. You can add an ID to the form element and re-render that instead. It's a bit cleaner in my opinion:



<apex:page standardController="Contact" extensions="CommandButtonParamController">  
    <apex:form id="theForm">

        <apex:commandButton value="Process Nickname" action="{!processButtonClick}" rerender="theForm">
            <apex:param name="nickName"
                value="{!contact.firstname}"
                assignTo="{!nickName}"/>
        </apex:commandButton>
    </apex:form>
</apex:page>

(modified version of the final example from Jeff's blog post)


Swapnadip123Swapnadip123
For apex:param to work with assignTo, always use reRender in the command button. reRender the enclosing DOM (form or pageblock).