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Asychronous Web Service Call

, 21 Feb 2013
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Asynchronous Web Service Call

Introduction

This tip gives us an idea to call methods of page in an asynchronous way.

Background

To call method asynchronously, AJAX has to provide build ins example $.ajax( ).

Using the Code

Step 1

Create a simple AsychCall web page (.aspx). Create a web method, which we need to consume asynchronously like:

[WebMethod]
[ScriptMethod()]
public static bool ExecuteReport(string reportingYear )
{
   
    bool returnvalue = true;
    int reportReturnValue = -1;
    try
    {
        reportReturnValue = GenerateReport.ReportGeneratereportingYear 
        if (reportReturnValue == -1)
        {
            return false;
        }
        return returnvalue;
    }
    catch (System.Exception ex)
    {
        return returnvalue;
    }
}

Step 2

Create another webpage and place a button like:

<td>
     <asp:Panel ID="pnlReportStatusMsg" 
                runat="server" Visible="true">
         <input type="button" id="btnReportGenerate" 
                    value="Generate Report" onclick="executeReport();"
                        runat="server" />
     </asp:Panel>
</td>

Step 3

On the button click, call a JavaScript method "executeReport(); like:

 $.ajax({
        type: "POST",
        url: "/AsychCall.aspx/ExecuteReport",
        data: "{reportingYearKey:'" + FiscalYearValue }",
        contentType: "application/json; charset=utf-8",
        dataType: "json",
        success: function (msg) {
            if (msg.d == false) {
                document.getElementById('<%= lblReportStatus.ClientID %>').
                style.display = 'block';
                $("#<%=lblReportStatus.ClientID %>

Step 4

Compile this code. You see, when you click the button "Generate Report", AJAX method asynchronously calls Web method "ExecuteReport" from AsychCall Web page.

License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

About the Author

Pathak Ashwin

United States United States
No Biography provided

Comments and Discussions

 
QuestionSince this is specifically about async PinmvpMarcus Kramer15-Feb-13 11:02 

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