Call HTTP handler using JQuery

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hi,
I need to call a http handler using JQuery in my aspx page on button click. The handler must execute a method when it is called.pls help me how to do this. give me some sample about this. i am new to http handlers and Jquery.pls help me..
The handler must actually generate a pdf report for which i have written the fuction. i jus need to know how and where o call this method using jquery and http hander.pls help me ...

Posted 30-Oct-12 0:20am

ajithk444

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Eyakem · Answer 1 · 2012-11-07T22:13:00

In this example we have a sample generic handler that reads a text file and resturns its content. In your case it would generate and return pdf file

The Handler:

XML

Imports System.Web
Imports System.Web.Services
Imports System.Web.Script.Serialization
Imports System.Web.Caching
Imports System.IO
Imports System.Diagnostics

Public Class genHandler
    Implements System.Web.IHttpHandler

    Sub ProcessRequest(ByVal context As HttpContext) Implements IHttpHandler.ProcessRequest

        Dim testData As String = ""
        Dim serializer As New JavaScriptSerializer()
        Dim sbJsonResult As New StringBuilder()

        testData = getTestData(context)
        serializer.Serialize(testData, sbJsonResult)

        context.Response.Clear()
        context.Response.ContentType = "application/json; charset=utf-8"
        context.Response.Write(sbJsonResult.ToString())

    End Sub

    ''' <summary>
    ''' read text file and encode it as html
    ''' </summary>
    ''' <param name="context">HttpContext, HTTP specific information of the current request</param>
    ''' <returns>HTTP encoded string from a test text file</returns>
    ''' <remarks></remarks>
    Private Function getTestData(ByVal context As HttpContext) As String
        Dim data As String = ""
        Dim rootPath As String = context.Server.MapPath("~")

        Debug.WriteLine(String.Format("{0}{1}{2}", vbCrLf, "***", vbCrLf))
        Debug.WriteLine(String.Format("{0}", rootPath))

        If context.Request.QueryString("search") = 1 Then
            Dim sr As New StreamReader(Path.Combine(rootPath, "/TestData/1.txt"))
            data = sr.ReadToEnd()
            data = HttpUtility.HtmlEncode(data)
        ElseIf context.Request.QueryString("fileName") = 1 Then
            Dim sr As New StreamReader(Path.Combine(rootPath, "/TestData/2.txt"))
            data = sr.ReadToEnd()
            data = HttpUtility.HtmlEncode(data)
        Else
            data = "file not found on server."
        End If

        Return data
    End Function


    ReadOnly Property IsReusable() As Boolean Implements IHttpHandler.IsReusable
        Get
            Return False
        End Get
    End Property

End Class

Default.aspx page

XML

<html>
<head>
    <title></title>
    <link href="style/style.css" rel="stylesheet" type="text/css" />
    <script src="js/jquery.js" type="text/javascript"></script>
    <script src="js/Script.js" type="text/javascript"></script>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    <select id="selectOption">
        <option value="1">File One</option>
        <option value="2">File Two</option>
    </select>
        <input type="submit" value="Get Data" onclick="javascript:loadDynamicContent();" />
        <div id="divLoading">
            Loading...
        </div>
        <div id="divResult">
        </div>
    </div>
    </form>
</body>
</html>

Script.js file

function loadDynamicContent() {    
    scroll(0, 0);
    showProgress(); //show the progress indicator
    var fileName = $('#selectOption').val();
    alert(fileName);
    $.getJSON(
        'BLL/genHandler.ashx?fileName' + fileName,
        function (data) {
            hideProgress(); //hide the progress indicator
            $("#divResult").css("display", "block");alert(data);
            $("#divResult").slideDown("slow"); 
            $("#divResult").html(data.d);
            alert(data);
        }
    );
}
function showProgress() {
    $("#divLoading").css("display", "block");
}
function hideProgress() {
    $("#divLoading").css("display", "none");
}

NOTE: Make sure you update the script and jquery path when you test the code above.

Use VB to C#[^] online conversion tool if you like to have it in C#

Hope this helps.