Telerik Spreadsheet update fromJSOn

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Herr Walter Gartmann
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Herr Walter Gartmann asked on 10 May 2024, 09:20 AM

I am trying to update my spreadsheet based on the jsonData i get from my controller.

Controller data:

public ActionResult GetDoubleCombinations(Telerik.Web.Spreadsheet.Workbook jsonData, int id)

    foreach (var sheet in jsonData.Sheets)
        var columnCount = sheet.Columns.Count;
        var rowCount = sheet.Rows.Count;

        for (int i = 2; i < columnCount; i++)
            var expressionTop = expressionService.GetExpressionByName(sheet.Rows[1].Cells[i].Value.ToString(), id);
            var parameterTop = expressionTop.FK_ParameterID;

            for (int j = 2; j < rowCount; j++)
                var expressionLeft = expressionService.GetExpressionByName(sheet.Rows[j].Cells[1].Value.ToString(), id);
                var parameterLeft = expressionLeft.FK_ParameterID;

                if (parameterTop == parameterLeft)
                    var position = sheet.Rows[i].Cells[j];
                    position.Enable = false;
                    position.Background = "#d3d3d3";

    return Json(new { success = true, data = jsonData });

this is what i get in my view:

function getDoubleCombinations() {

    var spreadsheet = $("#matrix").data("kendoSpreadsheet");
    const urlParams = new URLSearchParams(;
    const id = urlParams.get('analysisId');

        url: "@Url.Action("GetDoubleCombinations", "Matrix")",
        data: JSON.stringify({
            jsonData: spreadsheet.toJSON(),
            id: id
        contentType: "application/json",
        type: "POST",
        success: function (response) {
        error: function () {
            alert("Error loading data.");

I use "spreadsheet.fromJSON" to update my spreadsheet.

My spreadsheet:

@model Telerik.Web.Spreadsheet.Workbook
    .HtmlAttributes(new { style = "width:100%" })
    .Toolbar(t =>
        t.Home(h =>

My problem is, that the spreadsheet is not updated.

In the attachement i have a screenshot of my jsonData.

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Telerik team
answered on 15 May 2024, 06:17 AM

Hi Herr Walter Gartmann,

Normally, the existing Workbook instance exposes a ".ToJson()" method that can be invoked instead. This is further illustrated in the following demo in case you are curious:


public ActionResult Upload(IFormFile file)

    var workbook = Workbook.Load(file.OpenReadStream(), Path.GetExtension(file.FileName));
    return Content(workbook.ToJson(), Telerik.Web.Spreadsheet.MimeTypes.JSON);

This should alter the casing of the retrieved JSON object into a "camel-Case" format which should be enable the Spreadsheet to consume the data in an adequate manner.

I hope this helps.

Kind Regards,
Progress Telerik

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Herr Walter Gartmann
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