This case is not very well documented.
I found a nice tutorial here :
http://radio.javaranch.com/pascarello/2005/01/18/1106063002000.html
You can download samples here:
FromChildToParent
<%@ Page Language="vb" AutoEventWireup="false" CodeBehind="Default.aspx.vb" Inherits="WebApplication10._Default" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
<title></title>
<script type="text/javascript">
var w;
function openPopup() {
w = window.open("popup.aspx");
setTimeout("SendToChild()", 200);
//This works on FF.
w.onload = function() {
alert("child loaded");
}
}
function SendToChild() {
value = window.document.getElementById("tochild").value;
w.document.getElementById("fromparent").innerHTML = value;
}
</script>
</head>
<body>
<form id="form1" runat="server">
<div>
<input id="tochild" type="text" runat="server" />
<span id="opener" title="???" onclick="openPopup()" onmouseover="this.style.cursor='hand'">
Send To Child</span>
<hr />
Child said : <span id="fromchild"></span>
</div>
</form>
</body>
</html>
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