How to Pass web Method Value to a Label

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Hi,

I have a web method that is used to creat a a chart using chart.js... I want to pass a string value to a label... I will give the detailed code for the web method...

VB

<WebMethod()> _
        Public Shared Function GetZoneData(ByVal strMode As String) As String()
        Return GetZoneSalesData(strMode)
    End Function

    Private Shared Function GetZoneSalesData(ByVal strMode As String) As String()
        Dim clsSales As New TS.Corporate.SalesGenerateBarChart
        Dim dTable As New DataTable
        dTable = clsSales.ZoneSalesValue(strMode)
        Dim resultdata = From d In dTable.AsEnumerable()
        Dim data(dTable.Rows.Count - 1) As String
        For i As Integer = 0 To dTable.Rows.Count - 1
            Dim item As DataRow = dTable.Rows(i)
            data(i) = (String.Format("{0}-{1}", item("zone"), item("zoneTotal")))
        Next

        Return data
    End Function

I want to add another set of values to be passed on to the client side...

It will be as follows

VB

Dim clsSales As New TS.Corporate.SalesGenerateBarChart
        Dim strHead As String = clsSales.ZoneSalesString(strMode)

This is a Heading for the chart generated and the value is generated from the "strMode" parameter. I want to pass that strHead value and display it on a label... How can I pass this value to a label using Ajax...

Regards,

Sajin

Posted 11-Dec-15 18:19pm

SajinAboo

Updated 11-Dec-15 18:26pm

v2

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koolprasad2003 · Answer 1 · 2015-12-11T19:28:00

As you know we can not access controls in web method, so You need to use JavaScript/Jqury to set label value.
//first you need to call javascript and then call web method from it, see below snippet

JavaScript

//IN ASPX
//from javascript call webmethod and pass parameters if exist and give call method
function callwebmthod()
{
PageName.MathodName(Param1, Param2, MathodName_CallBack);
}


function MathodName_CallBack(response) 
{
   //here response object contains return result
   var szReturnFromWebmethod = response.value;
   //store return value in label
   document.getElementById("label1").innerHTML = szReturnFromWebmethod;

}

C#

//in .CS page define webmethod
[Ajax.AjaxMethod()]
public string MathodName(string Param1, string Param2)
{
    //your method code goes here
}

'value' property is not able to set value to label, you nee to use 'innerHTML' property, see below snippet

JavaScript

//for IE
 document.getElementById("label1").innerHTML = "change in text or whatever";

//other than IE
 document.all("label1").innerHTML ="change in text or whatever"