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EmsEms 

Why aren't my command links updating parameters correctly?

I have a datatable  with a column of command links - each link sets a parameter that I want to use to drive a data source for a different datatable on the page (basically select the category should drive what items display).

 

For some reason ALL of the parameters show up as whatever the first selection is!

 

Mind - if you insert the category parameter in the URL everything works fine - I'd just rather do this without refreshing the page every time.

 

...
 <apex:form>
    <apex:datatable value="{!Categories}" var="cat" >
       <apex:column headerValue="Categories">
            <apex:commandLink action="{!selectCategory}" value="{!cat}" rerender="goodstuff"> 
                <apex:param name="ctgry" value="{!cat}"/> 
             </apex:commandLink>
       </apex:column>
    </apex:datatable>
 </apex:form> 


   
   <apex:outputPanel id="goodstuff"> 
...other data table showing items here...
 
Thank you community!