Visualforce Error:Formula Expression is required on the action attributes

Question

I have a requirement to create a VisualForce Page that creates multiple records and deletes the record when I click on delete button, but I'm getting a VisualForce error ..Please Help....

    <apex:actionFunction reRender="frm" name="act" status="process" action="{!cdelete}">
          <apex:param assignTo="{!idx}" name="idx" value=""/>
    </apex:actionFunction>

    <apex:pageBlock >
        <table  cellpadding='5' cellspacing='0' width='500px'>

                <apex:variable value="{!i}"  var="index"/ >
                <apex:repeat value="{!contacts}" var="m">   
                <tr>               
                    <td><apex:inputfield value="{!m.Firstname}"/></td>

                    <td><apex:inputfield value="{!m.Lastname}" required="false" /></td>

                    <td><apex:inputfield value="{!m.Email}"/></td>

                    <td><apex:inputfield value="{!m.Phone}"/></td>

                    <td><apex:commandButton value="Delete" action="act('{!index}')" /></td>
                    <apex:variable var="index" value="{!index+1}" /> 
               </tr>
               </apex:repeat>

           <tr>
           <td colspan="5" align="center"><apex:commandButton value="Save" action="{!save}"/>
            <apex:commandButton value="Add" action="{!Add}"/></td>
          </tr>
       </table>
    </apex:pageBlock>
</apex:form>

//controller
public class ContactController{

public List<Contact> Contacts{get;set;}
public Integer i{get;set;}
public Integer idx{get;set;}

public ContactController(){


    i=0;
    Contacts = new List<Contact>();
    Contacts.add(new Contact());
}

public void save() {
    list <contact> con1=new list <contact>(); 
       for(Contact obj:contacts){
           if(obj.Lastname!=null)
           {     
                    con1.add(obj); 
           }  
        } 
      insert con1;

}

public void Add(){ 

    Contacts.add(new contact());
}

public void cdelete(){

    Contacts.Remove(idx);
 }
}

Answer 1

Replace the "action" in delete commandbutton to "onclick". This should resolve your issue

<td><apex:commandButton value="Delete" onclick="act('{!index}')" /></td>
                <apex:variable var="index" value="{!index+1}" />

Thanks & Regards
Saranya

Try this code for the page -

            <apex:variable value="{!0}"  var="index"/ >
            <apex:repeat value="{!contacts}" var="m">   
            <tr>               
                <td><apex:inputfield value="{!m.Firstname}"/></td>

                <td><apex:inputfield value="{!m.Lastname}" required="false" /></td>

                <td><apex:inputfield value="{!m.Email}"/></td>

                <td><apex:inputfield value="{!m.Phone}"/></td>

                <td><apex:commandButton value="Delete" onclick="act('{!index}')" rerender="false"/></td>

           </tr>
           <apex:variable var="index" value="{!index+1}" />
           </apex:repeat>

       <tr>
       <td colspan="5" align="center"><apex:commandButton value="Save" action="{!save}"/>
        <apex:commandButton value="Add" action="{!Add}" rerender="pb"/></td>
      </tr>
   </table>
</apex:pageBlock>

Answer 2

Do two thinks :: 1 . You are using the action function then you must use the Ajax method instead of button Action, replace the action with onclick.

2. You can update in Apex controller when you removing the record from the only list not in salesforce. If you need to delete the record as well as salesforce then you check the contact record id is available then you must delete the record from the salesforce

Regards Satya