Bug report

When applying data validation to all cells of a xlsx file and trying to import the file via Telerik.Web.Spreadsheet as demonstrated in the Server Import/Export demo the application will crash.

Reproduction of the problem

1. Check ticket 1661158 for a sample xlsx file.
   N.B. The sample file has an AnyValidation rule applied to all cells and a title set for the cells. In addition two columns have predefined styling rules - font, fontSize, etc.
2. Try to load the file using Telerik.Web.Spreadsheet, as demonstrated in the Demo.

Current behavior

Loading will fail.

Expected/desired behavior

File should be loaded

Possibly related to #4017
In the reported scenario there are 1048576 rows, with 16384 columns, resulting in 17179869184 cells all with applied non-default validation value, and we iterate them all to set the validation value, so it can be serialized.

Environment

• Kendo UI version: 2024.3.806

Expose a "bind-to" TagHelper attribute. Similar to the HTML Helper Spreadsheet counterpart.

The Speadsheet Component doesn't support importing of Charts which are part of the imported Excel files.

Please implement this feature to allow the use of Excel files which contain Charts in the Spreadsheet.

Bug report

The current TagHelper implementation of the Spreadsheet doesn't allow a definition of a custom toolbar. What the user can define in the toolbar configuratio is to show selected pre-defined tools using a configuration like the following:

    <toolbar>
        <home >
            <tool name="open"></tool>
        </home>
    </toolbar>

In the Kendo UI for jQuery suite, we can define a custom toolbar as follows:

      $("#spreadsheet").kendoSpreadsheet({
        toolbar: {
          home:[
            {
              type: "button",
              text: "PDF",
              showText: "both",
              icon: "k-icon k-i-download",
              click: exportPdf
            }]
        }
      });

Reproduction of the problem

Here is a sample project in which the "Open file" tool is defined.

Current behavior

We cannot define a custom toolbar using the Spreadsheet tag helper.

Expected/desired behavior

The user should be able to define a custom toolbar using the Spreadsheet tag helper as it is possible in the Kendo UI for jQuery suite - https://dojo.telerik.com/alobigUQ

Environment

• Kendo UI version: 2020.3.1118
• jQuery version: x.y
• Browser: [all]

I raised a support ticket for the spreadsheet control regarding performance and was asked to make a feature request. I'm running a Monte Carlo simulation in a relatively simple spreadsheet. I need to recalculate a cell value (which references other cells including a random function in a formula) and enter that in a new cell. The process is repeated 500 times so I have 500 new numbers. This is nearly instant in Excel desktop and online. In the telerik control each time I get the value of the cell and set it to the new cell it takes 1-2 seconds. Setting the new cell refreshes the one referencing the random number. The routine can take over 10 minutes to run. If I run in a batch job the cell with the random number is not recalculated so I have the same number 500 times. I need to be able to recalculate the cell without the overhead of updating the layout.  

Introduction to Monte Carlo simulation in Excel
https://support.microsoft.com/en-us/office/introduction-to-monte-carlo-simulation-in-excel-64c0ba99-752a-4fa8-bbd3-4450d8db16f1