I have a grid very similar to the one in this telerik example where I am using 3 different client templates to populate and bind 3 drop downs in my grid:

https://demos.telerik.com/aspnet-core/grid/editing-custom

My dropdowns are: Category, Department, Configuration

So my grid is defined like this with custom editors

And the model I'm binding to looks just like in the example:

I need the dropdowns to cascade.....choose a Category, it loads Departments associated with that category, choose a Department, it loads configurations associated with that department. So my code in the custom editor is simply (this is for category, for department it passes the selected categoryId in the read action , etc)

And visually works correctly, choosing a category will re-fill the department options and by default the first item is now selected. But if you go to save it at this point, even though the first item is selected, the model does not reflect that: e.model.Department = null. You have to physically choose an item from the Department drop down to get it to set that model value correctly. What is going on here? Why is not binding the model to the selected item when it refills? 

Afternoon

Using Package Telerik.UI.for.AspNet.Core(2020.2.617)

Goal: 

I want to switch Kendo Menu to use k-i-menu rather than font awsome icon.

Problem

It is always blank when i reference the k-i-menu. This is because it adds k-sprite into the span it generates and that seems to cause the issues

e.g. <span class="k-sprite k-icon k-i-menu k-icon-32"></span>

Example Code

<span class="k-icon k-i-menu k-icon-32"></span> <-- this shows bars
<div style="padding-right: 5px" class="k-content">
    @(Html.Kendo().Menu().Name("NavMenu").Items(items =>
    {items.Add()
            .Items(innerChilderen =>
            {
                innerChilderen.Add().Text("Reports").Url("/Something");
            }).SpriteCssClasses("k-icon k-i-menu k-icon-32");  <--- this is blank
    }))
</div>

I assumed it would be an easy switch since it was already working with font awesome. Not sure if i'm missing something as far as using the kendo icons with this menu. Looking forward to your thoughts.

After upgrading from 2.2 to 3.1 my grid control no longer works.  I am available for a phone call if that is easier.

Note: I have success with Html.Kendo().Menu() but also failure on Html.Kendo().TreeList<Group>().  I verified I have valid data.

Project:

Shared._Layout:

I note that on this training your header looks different than mine.  Do I need to completely rework this?

https://docs.telerik.com/aspnet-core/getting-started/first-steps#adding-reference-to-kendomvcui

_ViewImports.cshtml

Grid:

Callback:

I'm migrating some code from netFramework asp.net to asp.net core and I found some unexpected behavior with an editor used everywhere in my old code.

I'm bounding a timestamp property in a table like this:

And I have an editor template for timestamps:

If I load the page containing the table y get an exception:

System.NullReferenceException: Object reference not set to an instance of an object.
   at Microsoft.AspNetCore.Mvc.ViewFeatures.ExpressionMetadataProvider.<>c__DisplayClass0_0`2.<FromLambdaExpression>g__modelAccessor|0(Object container)
   at Microsoft.AspNetCore.Mvc.ViewFeatures.ModelExplorer.get_Model()
   at Kendo.Mvc.UI.Fluent.WidgetFactory`1.NumericTextBoxFor[TValue](Expression`1 expression)
   at Kendo.Mvc.UI.Fluent.WidgetFactory`1.IntegerTextBoxFor(Expression`1 expression)
.....

The EditorTemplate works normally if I use in other pages like:

Thanks

    I creatred a new project using the Telerik template.  By default, the IAntiforgery token was injected.  In order to use that token, the Datasource invokes it this way:

    .DataSource(ds => ds.Ajax()
            .Read(r => r.Url("/Index?handler=Read").Data("forgeryToken"))

That .Data references to a script like this:

<script>
    function forgeryToken() {
        return kendo.antiForgeryTokens();
    }
</script>

Question... if I have additional data to include, how is the forgeryToken included?

I use a script like this:

Is it possible to do use a dynamic editor on a column with C# wrappers, like the example below does for jquery?  

https://docs.telerik.com/kendo-ui/knowledge-base/grid-use-dynamic-editor

How can I achieve similar functionality?  

I have a simple Preference object that can have different types of values.  (Boolean, String, Number, etc).  

The preference object has a DataType that tells it what type for each row.  I would like to use this value to determine what editortemplate to use.  

Thank you very much for your help.  

I based the implementation on the example video about TagHelpers. But no data is displayed. A call to the URL (https://localhost:44337/Suppliers/Read) provides data. What am I doing wrong?

SuppliersController:

Index.chtml:

_SuppliersGrid:

I'm using remote binding, but not appears arrow to expand node.

This is method

This is control

 I attached result

I am trying to have a treelist with the new functionality and the drag&drop functionality.

I have enabled the drag&drop functionality but the treelist does not update the relationship after the drop ends.

On another post it was suggested to set Autosync on the datasource. However this creates the problem that when creating a new item it is automatically saved without the user been able to enter values first. This is not acceptable for my situation because there are some fields that are mandatory and I do not want to use a default value. So Autosync is out of the question.

On another post it was suggested to handle the DragEnd and call manually the sync on the datasource. However this is not handle as expected. Because my method sometimes should fail (The datasource error event is called). And after the error event is handled the treelist is in an incorect state since the dragged item is displayed with the wrong parent (In the Autosync if an error occured the drop would be canceled and the item returns to the initial position)

So my question is how can I have the two functionalities? (Autosync-ing only drag&drop and leave the create without autosync)

Hello,

I have scheduler that has editable events. When editing an event the template that i provide loads up another scheduler. The scheduler within the editor template needs to have it's date set to match the start date of the event i'm editing. So far i can get this working by using a custom binder to bind my date in the editor model to my scheduler.

EditorTemplate:

javascript:

The issue i have is i don't want the scheduler to read from my data source on load, so i've specified that autoBind should be false on this scheduler however because i'm trying to bind the date this way that results in a change event being fired and my data source gets read.

Is there any way for me to provide the scheduler in my editor template a start date via the html helpers to avoid having to write a custom binder?