Broken scroll and overflow appearance in Spreadsheet

Problem

When you load a file in the Spreadsheet, sometimes it has a broken appearance, it overflows and the scroll is not working.

Description

Most commonly the reasons for the unexpected behavior are JavaScript errors or loading some Excel files. Most of the Excel files that cause such an issue are loaded server-side and contain frozen rows and columns.

SOLUTION

Option 1

Remove the frozen rows and columns when loading the file:

C#

protected void Page_Init(object sender, EventArgs e)
{
    var provider = new SpreadsheetDocumentProvider(Server.MapPath("~/App_Data/MyExcelFile.xlsx"));
    RadSpreadsheet1.Provider = provider;
 
    foreach (var sheet in provider.GetSheets())
    {
        sheet.FrozenColumns = 0;
        sheet.FrozenRows = 0;
    }
}

VB

Protected Sub Page_Init(ByVal sender As Object, ByVal e As EventArgs)
    Dim provider = New SpreadsheetDocumentProvider(Server.MapPath("~/App_Data/MyExcelFile.xlsx"))
    RadSpreadsheet1.Provider = provider

    For Each sheet In provider.GetSheets()
        sheet.FrozenColumns = 0
        sheet.FrozenRows = 0
    Next
End Sub

Option 2

If you need the frozen rows and columns to persist, you can load the file on the client by saving it to a base64string.

ASP.NET

<asp:HiddenField  runat="server" ID="HiddenField1"/>

JavaScript

<script>
function pageLoadHandler() {
    var spreadsheet = $find("<%= RadSpreadsheet1.ClientID %>");
    var value = $get("<%= HiddenField1.ClientID %>").value;
                     
    var file = b64toBlob(value)
    spreadsheet.fromFile(file);
}
Sys.Application.add_load(pageLoadHandler);

// https://ourcodeworld.com/articles/read/322/how-to-convert-a-base64-image-into-a-image-file-and-upload-it-with-an-asynchronous-form-using-jquery
function b64toBlob(b64Data, contentType, sliceSize) {
    contentType = contentType || '';
    sliceSize = sliceSize || 512;
  
    var byteCharacters = atob(b64Data);
    var byteArrays = [];
  
    for (var offset = 0; offset < byteCharacters.length; offset += sliceSize) {
        var slice = byteCharacters.slice(offset, offset + sliceSize);
  
        var byteNumbers = new Array(slice.length);
        for (var i = 0; i < slice.length; i++) {
            byteNumbers[i] = slice.charCodeAt(i);
        }
  
        var byteArray = new Uint8Array(byteNumbers);
  
        byteArrays.push(byteArray);
    }
  
    var blob = new Blob(byteArrays, { type: contentType });
    return blob;
}
</script>

C#

protected void Page_Load(object sender, EventArgs e)
{
    //https://stackoverflow.com/questions/25919387/c-sharp-converting-file-into-base64string-and-back-again
    Byte[] bytes = File.ReadAllBytes(Server.MapPath("~/App_Data/MyExcelFile.xlsx"));
    String file = Convert.ToBase64String(bytes);
    HiddenField1.Value = file;
}

VB

Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs)
    'https://stackoverflow.com/questions/25919387/c-sharp-converting-file-into-base64string-and-back-again
    Dim bytes As Byte() = File.ReadAllBytes(Server.MapPath("~/App_Data/MyExcelFile.xlsx"))
    Dim file As String = Convert.ToBase64String(bytes)
    HiddenField1.Value = file
End Sub