Last Updated: 17 May 2022 15:19 by Ian


I seem to have unearthed a bug in the Kendo spreadsheet control. When the spreadsheet has only 1 row and there is column validation somewhere on the sheet, if I then edit a cell (without validation), 8 rows are created.

See the following Dojo

Kendo UI Snippet | Kendo UI Dojo (

Steps to reproduce.

1. Run the Dojo

2. Edit the UnitPrice cell to, say 20

3. Save changes

4. Observe in the browser console (F12) 8 rows created.

Expected results are 0 rows created and 1 updated




Last Updated: 08 Oct 2021 08:28 by ADMIN

Not so recently HTML 5 has added minLength and maxLength attributes (including form based validation) to their spec for input fields of the above mentioned types. Kendo UI Validator does not seem to use them during validation. It is, of course, possible to add a custom validation rule, however, it would be much preferred to use the built-in mechanism in modern browsers to do so.

Standard reference

HTML 5 standard maxLength and minLength


Demonstration code which does not fire a validation error:

<!DOCTYPE html>
    <meta charset="utf-8"/>
    <title>Kendo UI Snippet</title>

    <link rel="stylesheet" href=""/>

    <script src=""></script>
    <script src=""></script>
    <form class="myValidator">
      <p><input type="text" name="age" minlength="3"></p>
      <button id="validate" class="k-button k-primary" type="button">Validate</button>

        var validator = $(".myValidator").kendoValidator({
            minlength:"Number must be greater than 3"

Last Updated: 31 Mar 2021 13:38 by ADMIN
Created by: John
Comments: 2
Category: Validator
Type: Feature Request

If we make an input readonly it doesn't get validated and wee need it to be validated on a readonly datepicker.

In kend.all.min.js we have



and if i modify it by adding readonly like below



We need to make that code configurable because the workarounds concerining this problem it's buggy.

Last Updated: 24 Jan 2020 09:53 by ADMIN
Created by: Kevin
Comments: 1
Category: Validator
Type: Feature Request

Allow customization of the Validation Tooltip position.

For example, positioning the Tooltip based on the cell, on the input.