<h:commandButton action="#{user.editAction(delete)}" />

@ManagedBean(name="user")
@SessionScoped
public class UserBean{
 
	public String editAction(String id) {
	  //id = "delete"
	}
 
}

<h:commandButton action="#{user.editAction}">
	<f:param name="action" value="delete" />
</h:commandButton>

@ManagedBean(name="user")
@SessionScoped
public class UserBean{
 
	public String editAction() {
 
	  Map<String,String> params = 
                FacesContext.getExternalContext().getRequestParameterMap();
	  String action = params.get("action");
          //...
 
	}
 
}

<h:commandButton action="#{user.editAction}" actionListener="#{user.attrListener}"> 
	<f:attribute name="action" value="delete" />
</h:commandButton

@ManagedBean(name="user")
@SessionScoped
public class UserBean{
 
  String action;
 
  //action listener event
  public void attrListener(ActionEvent event){
 
	action = (String)event.getComponent().getAttributes().get("action");
 
  }
 
  public String editAction() {
	//...
  }	
 
}

<h:commandButton action="#{user.editAction}" >
    <f:setPropertyActionListener target="#{user.action}" value="delete" />
</h:commandButton>

@ManagedBean(name="user")
@SessionScoped
public class UserBean{
 
	public String action;
 
	public void setAction(String action) {
		this.action = action;
	}
 
	public String editAction() {
	   //now action property contains "delete"
	}	
 
}