IFrame + parent page submission

[SpringBeginer]

I have a situation where in there is an IFrame in my jsp which is used for displaying a list of customer objects containing name,age and address.

All the fields are textboxes wherein user can edit the data. Say for eg: if there are 5 customer in the IFrame, now user can edit any of the 15 textboxes,

My problem is : When user clicks on submit button on the parent jsp, I should populate the value changed in the IFrame along with the some other fields in the parent jsp.

I am able to populate the changed values if the customer list is in parent jsp. with this code :

<c:forEach var="customer" items="${backingBean.customerList}"
varStatus="loopStatus">
<tr>
<td>
<c:out value="${customer.name}" /> :<br>
<spring:bind
path="backingBean.customerList[${loopStatus.index}].name">
<input type="text" name="<c:out value="${status.expression}"/>"
value="<c:out value="${status.value}"/>" />

</spring:bind>
</td>
<td>
<c:out value="${customer.age}" /> :<br>
<spring:bind
path="backingBean.customerList[${loopStatus.index}].age">
<input type="text" name="<c:out value="${status.expression}"/>"
value="<c:out value="${status.value}"/>" />

</spring:bind>
</td>
</tr>
</c:forEach>

But, as iframe has a separate form and my parent jsp has a seperate separate form I am unable to do it.

If at all my iframe contains a single textbox i can populate the value by accessing the textbox in iframe through js as follows:

var fr=frames['iframe1'];
var frameForm;
if(fr && fr.document){
frameForm = fr.document.forms[0];
document.getElementById("frameValue").value = frameForm.elements["frameValue"].value;
}

But as this is a list population i am unable to do it...

Any possible way to populate the iframe value on click of submit button on my parent jsp