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Error Empty string passed to getElementById()

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Ajax

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3 Answers, 1 is accepted

answered on 31 Oct 2016, 08:46 AM

Hi, thanks for the answer.

I made a small test case that shows the problem.

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="TestTelerik.aspx.cs" Inherits="TestTelerik" %>

<%@ Register Assembly="Telerik.Web.UI" Namespace="Telerik.Web.UI" TagPrefix="telerik" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">

<head runat="server">

<title></title>

</head>

<body>

<form id="form1" runat="server">

<telerik:RadScriptManager ID="RadScriptManager1" runat="server" />

<telerik:RadImageGallery RenderMode="Lightweight" runat="server" ID="RadImageGallery1" DisplayAreaMode="LightBox" Width="100%" >

<ThumbnailsAreaSettings Height="250px" ThumbnailHeight="50px" ThumbnailWidth="50px" />

</telerik:RadImageGallery>

</form>

</body>

</html>

using System;

using System.Data.OleDb;

using System.IO;

using Telerik.Web.UI;

public partial class TestTelerik : Telerik.Web.UI.RadAjaxPage

{

protected void Page_Load(object sender, EventArgs e)

{

string strConnection = Application["StrConnection"].ToString();

OleDbConnection myConnection = new OleDbConnection(strConnection);

myConnection.Open();

string StrSql =

"SELECT [NickName], [Campo1], [Img1], [ID Utente], [Data Nascita], [Cod Segno] FROM Utenti WHERE [Campo2] = True AND [Campo3] = True AND [Campo4] = False AND [Campo5] = False ORDER BY Rnd(-10000000*TimeValue(Now())*[ID Utente])"

;

OleDbCommand myCommand = new OleDbCommand(StrSql, myConnection);

OleDbDataReader myReader = myCommand.ExecuteReader();

while (myReader.Read())

{

int Eta = Tools.CalcolaEta(myReader.GetDateTime(myReader.GetOrdinal("Data Nascita")));

ImageGalleryItem Img = new ImageGalleryItem();

Img.Title = myReader["NickName"].ToString() + " " + Eta.ToString() + " anni";

Img.Description = Tools.SegnoFromID(myReader.GetByte(myReader.GetOrdinal("Cod Segno"))) + "<br /><br />\"" + Tools.Get5Parole(myReader["Campo1"].ToString()) + "<br /><br /><center><a class=\"btn btn-primary btn-xs\" href=\"/annunci/single.aspx\" role=\"button\">Prova " + Application["NomeServizio"].ToString() + "</a></center>";

Img.ImageUrl = "~/public/" + Tools.CreateHash(myReader["ID Utente"].ToString()) + "/" + (Convert.ToBoolean(Session["Verificato"]) ? "s" : "bs") + "-" + myReader["ID Utente"].ToString() + Path.GetExtension(myReader["Img1"].ToString());

RadImageGallery1.Items.Add(Img);

}

myReader.Close();

myConnection.Close();

}

answered on 02 Nov 2016, 03:20 PM

Hi,

If you would like to data-bind the RadImageGallery programmatically you should use the NeedDataSource event. Please examine the following resources that illustrate the approach:

http://demos.telerik.com/aspnet-ajax/image-gallery/examples/data-binding/server-side-binding/declarative-and-programmatic-binding/defaultcs.aspx

http://docs.telerik.com/devtools/aspnet-ajax/controls/imagegallery/data-binding/server-side/advanced-via-needdatasource

Regards,
Viktor Tachev
Telerik by Progress

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