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Editorial Team
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Asked: 2026-06-04T03:46:32+00:00

For some reason, the value returned by the Modal Dialog box is always undefined.

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For some reason, the value returned by the Modal Dialog box is always “undefined”.

My Main page (aspx):

<%@ Page Title="Home Page" Language="VB" AutoEventWireup="false" CodeFile="Default.aspx.vb" Inherits="_Default" %>

<html>
<head></head>
<body>

<script type="text/javascript">

function openWindows () {
    var getval;
    getval = window.showModalDialog('../WebSite/popups/uploader.htm');
    document.getElementById("Input").value = getval;
   }
</script>

<input id="Input" runat="server" />
<input type="button" id="Button1" runat="server" onclick="openWindows()" value="Choose Image"/>
</form>
</body>
</html>

So in this case, the value of getval is always “undefined”

My Dialog Box (HTML) Code:

<html>
<head>
    <script type="text/javascript">
        function ReturnValues() {
            var objfile = document.getElementById("fileup").value
            document.getElementById("TxtInput").value = objfile
            var vReturnValue = document.getElementById("TxtInput").value;
            window.ReturnValue = vReturnValue;
            window.close();
        }

    </script>
</head>
<body>
    <form id="Formuploader" method="post" runat="server">
        <input id="TxtInput" type="hidden" runat="server" /><br />
        <button id="btnSaveImage" runat="server" onclick="ReturnValues()">Save Image</button>
    </form>
    </body>
    </html>

Here, ReturnValue does have the required value. But as soon as the ModalDialog closes, the getval variable in the main window becomes undefined.

Any help is greatly appreciated.
Thanks!

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1 Answer

  1. Editorial Team

    when you return value, do it this way:

    window.returnValue = vReturnValue;

    use lowercase returnValue, not ReturnValue.

    also, your modal dialog is not closing. to fix that, change your button to a link.

    <a href="#" id="btnSaveImage" runat="server" target="_self" onclick="ReturnValue()">
        Save Image</a>
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