Unknown function addElement. Check spelling apex salesforce

Question

i created a visualforce page in which there is a code segment

<apex:column ><apex:commandButton value="{!if(item.i == size-1,'Add','Delete')}" action="{!if(size == 1,addElement(),removeElement())}"></apex:commandButton></apex:column>

i created a custom controller containing function

public PageReference addElement(){

return null;

}
public PageReference removeElement(){

return null;

}

but when i try to save the visualforce page it is giving me error

Error: Unknown function addElement. Check spelling

can any one please tell me how to use if structure in action attribute so that it will properly work

Are you trying to call the addElement()/removeElement() method present in the controller? If yes then you dont need to specify the round brackets in the action attribute. It should simply be action="{!IF(size == 1, addElement, removeElement}" — Shailesh Deshpande
i tried that also but it will give me error unknown property addElement after that i tried addElement() .please check it by yourself — Ritesh Mehandiratta

Shimshon Korits Shimshon Korits · Accepted Answer · 2013-03-10T06:46:39

Change it to

<apex:commandButton value="{!if(item.i == size-1,'Add','Delete')}" action="{!addElement}" rendered="{!size == 1}"/>
<apex:commandButton value="{!if(item.i == size-1,'Add','Delete')}" action="{!removeElement}" rendered="{!NOT(size == 1)}"/>

Unknown function addElement. Check spelling apex salesforce

1 Answers