Last Updated: 19 Apr 2021 18:11 by ADMIN
Release 2.24.0
Created on: 25 Sep 2020 11:57
Category: Grid
Type: Bug Report
Async calls in Grid events prevent you from updating the grid State

If I add an await-ed call in the OnRowClick handler, then I cannot alter the grid state later in the code. It only works if the method is called again (e.g., a second click on the same row).


This affects other Grid events too, for example, the PageChanged


A workaround is to use synchronous code (remove the await call):

@inject IJSRuntime JsInterop

<TelerikGrid Data="@salesTeamMembers" OnRowClick="@OnRowClickHandler" @ref="@GridRef">
            var employee = context as MainModel;
            <TelerikGrid Data="employee.Orders" Pageable="true" PageSize="5">
                    <GridColumn Field="OrderId"></GridColumn>
                    <GridColumn Field="DealSize"></GridColumn>
        <GridColumn Field="Id"></GridColumn>
        <GridColumn Field="Name"></GridColumn>

@code {
    List<MainModel> salesTeamMembers { get; set; }
    TelerikGrid<MainModel> GridRef { get; set; }

    async Task OnRowClickHandler(GridRowClickEventArgs args) {
        // After adding this line, it now requires a double click when the InvokeAsync call uses "await"
         var width = JsInterop.InvokeAsync<int>("getWidth");

        var model = args.Item as MainModel;
        int index = salesTeamMembers.IndexOf(model);
        //todo: you may want to take paging into account for example, or use js interop to get the index of the row based on contents from it like id
        if (index > -1) {
            var state = GridRef.GetState();
            state.ExpandedRows = new List<int> { index };

            await GridRef.SetState(state);


    protected override void OnInitialized() {
        salesTeamMembers = GenerateData();

    private List<MainModel> GenerateData() {
        List<MainModel> data = new List<MainModel>();
        for (int i = 0; i < 5; i++) {
            MainModel mdl = new MainModel { Id = i, Name = $"Name {i}" };
            mdl.Orders = Enumerable.Range(1, 15).Select(x => new DetailsModel { OrderId = x, DealSize = x ^ i }).ToList();
        return data;

    public class MainModel {
        public int Id { get; set; }
        public string Name { get; set; }
        public List<DetailsModel> Orders { get; set; }

    public class DetailsModel {
        public int OrderId { get; set; }
        public double DealSize { get; set; }



1 comment
Marin Bratanov
Posted on: 19 Apr 2021 14:25

Hi all,

The solution to this will be a new event argument field called "ShouldRender" that you can set to true when you need the component to rerender (e.g., after you update its state or parameters).

Marin Bratanov
Progress Telerik

Тhe web is about to get a bit better! 

The Progress Hack-For-Good Challenge has started. Learn how to enter and make the web a worthier place: