Is it possible to enable or disable the drag & drop feature per row?

I have two or more grids that display products with a quantity field. Dragging from the master grid will move the product and quantity from one grid to an other. When this happens, the secondary grid will get the total quantity from the master grid, leaving the original row with 0 quantity. When the quantity is 0, I want to disable the dragging feature for this particular row. When part or all of the quantity is returned to the original master row, the dragging feature should once again be enabled. I also want to disable drag & drop on the same grid.

It seems to me that there is no drag start event to trigger a possible cancel of drag drop or a drag over event to disable droping an item.

Hi,

I am using telerikgrid control to present my data on the page. 

I am using a header GridCheckboxColumn to select the rows. I want to put a condition so that some rows cannot be selected (disabled for selection).

Please can someone provide some solution for this requirement.

Thanks,

Afreen

Hi,

I am using the TelerikGrid control to present the data.

I am also using a TelerikGridCheckboxColumn which is bind to a IEnumerableList. I want to disable header checkbox when all the values of IsSelected property in the list are false.

How can I do that?

Thanks,

Afreen

Using blazor server with latest Telerik Blazor package (currently 4.1.0).

I created a very simple CustomDropDownList.razor file with the following:

@typeparam TItem
@typeparam TValue
@inherits TelerikDropDownList<TItem, TValue>

and attempted to use the new component in a page:

@page "/test"

<CustomDropDownList Data="testData" @bind-Value="value" />

@code {
    int? value = null;

    private List<Model> testData = new List<Model>()
    {
        new Model() { Id = 1, Text = "Item 1" },
        new Model() { Id = 2, Text = "Item 2" }
    };

    class Model
    {
        public int? Id { get; set; }
        public string Text { get; set; }
    }
}

I get the javascript error:

Cannot read properties of null (reading addEventListener)

I'm aware you have a page regarding this error, but it only suggests making sure telerik-blazor.js file is up to date. Mine is.

Now, if I define the same component in a .cs file instead of a .razor file, the scenario works fine:

public class CustomDropDownList<TItem, TValue> : TelerikDropDownList<TItem, TValue>
{
}

REPL with error (using .razor file): https://blazorrepl.telerik.com/GRaoFuvr00aqKiQq27
REPL that works (using .cs file): https://blazorrepl.telerik.com/wHkyFubg58jPmb8D40

So what is going on here?

Ultimately, I'm trying to inherit from TelerikDropDownList to encapsulate a reusable custom dropdown. I have done this with .cs files a number of times with no problem, but in this case I was wanting to define an ItemTemplate and it's much more practical to do .razor file - that's when I discovered this issue.