GetCallbackEventReference is not working correctly

Rama Krishna boyina 21 Reputation points
2022-05-31T18:57:23.337+00:00

I have a small web application using ASP.NET.
I have implemented GetCallbackEventReference as follows

CallBackTest.aspx.cs:-

public partial class CallBackTest : System.Web.UI.Page,ICallbackEventHandler
{
protected void Page_Load(object sender, EventArgs e)
{
Initialize();
}

    public void Initialize()
    {
        mObcButton.Attributes["onclick"] = base.Page.ClientScript.GetCallbackEventReference(
            // control to handle callback on the server
                                                this,
            // from client
            // add "R" to string to denote On Demand Read button/callback
                                                String.Format("\"{0}|{1}|{2}|{3}\"", "R", "73659627", "121", "1"),
            // browser callback function
                                                "obcCallback",
            // context directly from us for callback function
                                                 mObcButton.ClientID)
                                                 + "; obcRequested(" + mObcButton.ClientID + ")";

    }

    public void RaiseCallbackEvent(String eventArgument)
    {
        // Processes a callback event on the server using the event
        // argument from the client.
    }

    public string GetCallbackResult()
    {
        // Returns the results of a callback event to the client.
        string dateString = DateTime.Now.ToLongDateString();

        return dateString;
    }

}

CallBackTest.aspx:-

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="CallBackTest.aspx.cs" Inherits="GetCallBackDemo2.CallBackTest" %>

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>

</head>
<body>
<table class="properties" width="100%">
<tr>
<td class="propertiesLabel" style="height: 26px; width: 31%">On Demand

        <br />
            Consumption Read:</td>
        <td class="propertiesValueWrap" style="height: 26px">
            <input id="mObcButton" runat="server" class="button" name="mOdrButton" type="button" style="padding: 2px"
                value="Read..." onclick="obcRequested(this)" />

        </td>
    </tr>
    <tr>
        <td class="propertiesLabel">Status:</td>
        <td id="odrStatus" class="propertiesValueWrap">
            <asp:Literal ID="mObcStatusText" runat="server" />
        </td>
    </tr>
</table>

</body>

<script type="text/javascript">

function mObcButton_onclick() {

}

function obcRequested(aButton) {
    var now = new Date();
    aButton.disabled = true;

    document.getElementById("obcStatus").innerHTML = "<a id='obcStatusAnchor' title='Request was sent at " + now + ".'>"
        + "Waiting for response...</a>";
    document.getElementById("obcButtonId").value = aButton.id;
    window.setTimeout("onObcRequestTimeout()", document.getElementById("obcTimeoutMillisec").value);
}

// response handling ********************
function obcCallback(result, contextIsButton) {
    var columns = result.split('|');
    var readValue = "no data";
    var readDateTime = "";
    var readSource = "";
    var readStatus = "N/A";
    if (columns.length > 0) {
        readValue = columns[0];
    }
    if (columns.length > 1) {
        readDateTime = columns[1];
    }
    if (columns.length > 2) {
        readSource = columns[2];
    }
    if (columns.length > 3) {
        readStatus = columns[3];
    }

    var durationMillisec = new Date().getTime() - document.getElementById("obcRequestTimeMillisec").value;
    document.getElementById("obcStatus").innerHTML = "<a id='obcStatusAnchor' title='" + "Response in " + Math.round(durationMillisec / 1000) + " seconds (" + durationMillisec + " milliseconds).'>"
        + readStatus + "</a>";
    contextIsButton.disabled = false;
}

function onObcRequestTimeout() {
    if ("Waiting for response..." == document.getElementById("obcStatusAnchor").innerHTML) {
        document.getElementById("obcStatusAnchor").innerHTML = "Web Server Timed Out";
        document.getElementById(document.getElementById("obcButtonId").value).disabled = false;
    }
}

</script>
</html>

But it is not hitting GetCallbackResult().
Can anyone help on this one?

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ASP.NET
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  1. Yijing Sun-MSFT 7,071 Reputation points
    2022-06-01T06:14:34.097+00:00

    Hi @Rama Krishna boyina ,
    Please check your parameters of GetCallbackEventReference (). You could look for this article. You could try to run the example of the Microsoft.

    Best regards,
    Yijing Sun

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