removing dinamicaly added row from table having struts2

removing dinamicaly added row from table having struts2

i am quite new at this and i what to know how can i get a index row from a
dynamical table created whit struts2. Here is what i have tried so far:
test file Name

<tbody>
<s:if test="listanume.size>0">
<s:iterator value="listanume" status="statusVar">
<tr>
<td class="center">
<button class="btn"
onclick="javascript:setval(0)">
delete
</button>
</td>
<td><s:property value="nume"/></td>
</tr>
</s:iterator>
</s:if>
</tbody>
</table>
<h4>Numarul randului este: <s:property value="mysample"/> </h4>
<script>
var mysample= '';
function= setval(varval){
mysample=varval;
alert(mysample);
}
</script>
pop java
public class Pop {
private int nrrow;
private List<UserModel> listanume = new ArrayList<UserModel>();
UserModel user = new UserModel(),
user1 = new UserModel(),
user2 = new UserModel();
private String[] sample;
{
sample = new String[]{"list1", "list2", "list3"};
}
public String execute() {
user.setEmail("eret@esre");
user.setPass1("1234");
user.setNume("gigel");
user1.setEmail("yuii@ihj");
user1.setPass1("6789");
user1.setNume("marius");
user2.setEmail("nmnn@cvx");
user2.setPass1("7676");
user2.setNume("sorin");
sample1.add(user);
sample1.add(user1);
sample1.add(user2);
return "succes";
}
public String afisnrow(){
execute();
listanume=sample1;
return "succes";
}
public String[] getSample() {
return sample;
}
public void setSample(String[] sample) {
this.sample = sample;
}
public List<UserModel> getSample1() {
return sample1;
}
public void setSample1(List<UserModel> sample1) {
this.sample1 = sample1;
}
public void setNrrow(int nrrow){
this.nrrow=nrrow;
}
public int getNrrow(){
return nrrow;
}
public List<UserModel> getListanume(){
return listanume;
}
public void setListanume(List<UserModel> listanume){
this.listanume=listanume;
}
}
every row has a button on it and when i click that button i need to get
the row index, i kind of stuck and run out of ideas, any suggestions?