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I have a method to get the param value : 

public PageReference facultyid() { public String fid{get;set;} System.debug('facultyId: ' + fid); return null; }

My page calls and sets this function as below:

<apex:pageBlockTable value="{!faculties}" var="f" id="fblock" rendered="{!faculities.size!=null}"> <apex:column > <apex:actionregion > <apex:outputpanel id="plusimage"> <apex:image url="{!$Resource.Plus_Image}" onclick="switchMenu('{!$Component.inlinetablesec}','{!$Component.minusimage}','{!$Component.plusimage}')" title="Expand - Faculties"> <apex:actionsupport event="onclick" action="{!facultyid}"> <apex:param name="facultyid" value="{!f.id}" assignTo="{!fid}" /> </apex:actionsupport> </apex:image> </apex:outputpanel> </apex:actionRegion>

So it should pass the "fid" value immediately, but it is not happening... its showing me null value in debug logs why is it so? am i doing something wrong here, please help me to get the value of fid to controller, i can't use action function as its inside the output panel between tables, so please suggest me. Thanks in advance for the help.

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5 Answers 5

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Param will be passed on post of form to server.

In your action support you don't have any rerender attribute. Add a rerender attribute and give id plusimage.

One more thing to note is apex:param behaves differently when passing id value with string literal in name attribute.

If you change this

<apex:param name="facultyid" value="{!f.id}" assignTo="{!fid}"/>

To

<apex:param name=" {!f.id} " value="{!f.id}" assignTo="{!fid}"/>

it works. Its not documented anywhere but usually works for me.

Hope it helps.

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  • When i add Rerender = plusimage or my pagblock id - its not expanding -means no action is performed now at all... Commented Jul 21, 2015 at 8:18
  • Then you should rerender whole form. Commented Jul 21, 2015 at 8:28
  • still it is coming as null; Commented Jul 21, 2015 at 8:38
  • Updated my answer to address this issue. Take a look and let me know if it worked. Commented Jul 21, 2015 at 8:54
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try using Command button.

<apex:commandButton action="{!removeCon}" id="remov" image="{!URLFOR($Resource.minus_icon1)}" style=" height:25px; width:25px;"reRender="pb2"> <apex:param name="selectedIndex" value="{!Wap.index}" /> </apex:commandButton>
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  • i don't want commandbutton on it , if i use commanbutton or commandlink , its working fine , but i dont want to use command button , its just expand all image Commented Jul 21, 2015 at 10:52
  • i tried with commandbutton or commandlink for apex param , and its not working Commented Jul 22, 2015 at 9:05
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Shouldn't fid be declared with its get & set before the method? Otherwise, the method should work with the local values.

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  • i have declared it before the method only but as i can't post my all lines of code over here , just added get set is declared to show. Commented Jul 22, 2015 at 8:46
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I don't know whats happening with apex param for apex support , So i just used below code to complete my requirement using action function 

<apex:actionFunction name="for faculty" action="{!facultyid}" rerender="myoutputpanel" > <apex:param name="fid" value="{0}" /></apex:actionFunction>
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I had the same problem when using param to pass value to apex code. Below code solve my problem. //apex code

public String fid{ get; set{ fid = value; } } public PageReference facultyid(){ system.debug('fid = ' = fid); }

//vf page

<apex:param name="fid" value="{!f.id}" assingTo="{!fid}"/>
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