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Is it just me or were these properties removed from the TextBox?  I had code with those properties set that no longer compiles after upgrading.
Marin Bratanov
Telerik team
 answered on 22 Sep 2019
1 answer
494 views

Hi,

Using: UI for Blazor 2.0 with .NET Core 3 RC1.
We're trying to get data to show on our chart. However it seems this is not working. We're binding a single series like this:

<TelerikChart>
            <ChartSeriesItems>
                <ChartSeries Type="ChartSeriesType.Line" Name="Values" Data="@_dataPoints" Field="@nameof(DataPoint.Value)" CategoryField="@nameof(DataPoint.Category)" />
            </ChartSeriesItems>
            <ChartLegend Position="Telerik.Blazor.ChartLegendPosition.Right" />
        </TelerikChart>

Our _dataPoints variable is set in OnInitializedAsync. We've tried invoking StateHasChanged after the variable has been set, but this does not seem to help. 
The "category" property on the DataPoint model was a DateTime but we changed this to string to check if that would work, but this also doesn't fix it.

private IEnumerable<DataPoint> _dataPoints = new List<DataPoint>();

    protected override async Task OnInitializedAsync()
    {
        _dataPoints = await CalculateDataPoints().ConfigureAwait(false);
        //await InvokeAsync(() => StateHasChanged()).ConfigureAwait(false);
    } 

 

Are we missing something?

Thank you in advance.

Marin Bratanov
Telerik team
 answered on 20 Sep 2019
2 answers
1.7K+ views

I think this is a blazor issue maybe, not Telerik.

Has anyone had an issue with OnInitializedAsync firing twice?

My event fires, loads the data in my grid, then fires again and reloads grid.

preview9-19423-09

Marin Bratanov
Telerik team
 answered on 16 Sep 2019
2 answers
1.4K+ views

Hey guys, here is my MainLayout.razor page.

The idea here is to have a side bar nav menu, which can be collapsed to give the user more screen real estate.

I am using MatBlazors app bar and drawer components to have the "collapsing" feature. And then using the Telerik Menu with some custom styling to incorporate the nav links. 

@inherits LayoutComponentBase

@using Telerik.Blazor.Components.RootComponent
@using MatBlazor;
@using Telerik.Blazor.Components.Menu;
@inject NavigationManager navigationManager
@inject Blazored.LocalStorage.ILocalStorageService localStorage
@using Newtonsoft.Json;
@using System.Threading.Tasks;

<head>
    <style>
        span.k-in.k-menu-link {
            display: flex;
        }

        .mdc-top-app-bar__row  {
            display:  flex;
            position:  relative;
            box-sizing:  border-box;
            width:  100%;
            height:  32px !important;
            background-color: #fafafa !important;
            top: 0px;
            position: fixed;
        }

        .mdc-top-app-bar--fixed-adjust {
            padding-top: 40px !important;
        }


        .mdc-drawer {
            z-index: 1;
            box-shadow: -4px 1px 14px 0px black !important;
        }



        /*MOBILE*/
        @@media (min-width: 320px) {
            .mdc-drawer__content {
                overflow-y: auto;
                -webkit-overflow-scrolling: touch;
                margin-top: 8px;
                background: #fafafa !important;
                height: 88vh;
            }

            .mdc-drawer.mdc-drawer--open:not(.mdc-drawer--closing) + .mdc-drawer-app-content {
                margin-left: 170px;
                margin-right: 0;
            }

            .mdc-drawer {
                width: 170px !important;
            }

            .Banner {
                width: 100%;
                background-color: #3f9d2f !important;
                height: 110px;
                margin-top: -2px;
                box-shadow: -2px -7px 15px 7px black;
                padding: 10px;
            }

            .UserIcon {
                font-size: 50px !important;
                color: #FFFFFF;
                margin-left: 39%  !important;
                cursor: pointer;
                margin-top: -7px;
            }

            .WideScreenClass {
                display: none;
            }

            .MobileClass{
                display:block;
            }

            .BannerUsernameHeading{
            margin: auto;
            color: #FFFFFF;
            text-align: center;
            font-weight: 500;
            font-size:30px !important;
                    }

            .BannerCompanyNameHeading{
                margin: auto;
                color: #FFFFFF;
                text-align: center;
                font-size:15px !important;
                margin-top: -9px;
            }

            .k-menu-group .k-item > .k-link, .k-menu-vertical .k-item > .k-link {
            color: black !important;
            margin-bottom: 2px !important;
            margin-top: 2px !important;
            line-height: 1.6 !important;
            font-family: Roboto !important;
            font-variant: all-petite-caps !important;
            font-size: larger !important;
        }


        }






        /*WIDE SCREEN*/
        @@media (min-width: 1280px) {
            .mdc-drawer__content {
                height: 100%;
                overflow-y: auto;
                -webkit-overflow-scrolling: touch;
                margin-top: 48px;
                background: #fafafa !important;
            }

            .mdc-drawer.mdc-drawer--open:not(.mdc-drawer--closing) + .mdc-drawer-app-content {
                margin-left: 256px;
                margin-right: 0;
            }

            .mdc-drawer {
                width: 256px !important;
            }


            .Banner {
                width: 100%;
                background-color: #3f9d2f !important;
                height: 175px;
                margin-top: -2px;
                box-shadow: -2px -7px 15px 7px black;
                padding: 10px;
            }

            .UserIcon {
                font-size: 64px  !important;
                color: #FFFFFF;
                margin-left: 36%  !important;
                cursor: pointer;
            }

            .main > div {
                padding-left: 2rem !important;
                padding-right: 1.5rem !important;
                margin-top: 48px;
            }

            .MobileClass {
                display: none;
            }

            .WideScreenClass{
                display:block;
            }

            .BannerUsernameHeading{
            margin: auto;
            color: #FFFFFF;
            text-align: center;
            font-weight: 500;
            font-size:42px !important;
                    }

            .BannerCompanyNameHeading{
                margin: auto;
                color: #FFFFFF;
                text-align: center;
                font-size:18px !important;
            }

            .k-menu-group .k-item > .k-link, .k-menu-vertical .k-item > .k-link {
            color: black !important;
            margin-bottom: 2px !important;
            margin-top: 2px !important;
            line-height: 2 !important;
            font-family: Roboto !important;
            font-variant: all-petite-caps !important;
            font-size: larger !important;
        }

        }








        :not(.mdc-list--non-interactive) > :not(.mdc-list-item--disabled).mdc-list-item { /*material chips*/
            color: black;
        }

        .mdc-drawer .mdc-list-item { /*make text in side menu black*/
            color: black;
        }

        .Title {
            padding-left: 20%;
        }

        .mat-accordion .mat-expansion-panel__summary .after {
            color: black;
        }

        .mat-accordion .mdc-nav-menu .mat-expansion-panel__content .mdc-list-item {
            font-weight: 500;
        }

        div#matBlazor_id_8e6ee3bc-7b6e-41e2-854a-b965730195b1 {
            overflow: hidden;
        }

        div#matBlazor_id_e44a318f-9585-474c-9dca-8576f4594719 {
            overflow: hidden;
        }

        div#matBlazor_id_d3b57f8a-30d5-4bf2-894e-2527d97e6529 {
            overflow-y: hidden;
        }

        .material-icons {
            font-size: 56px;
            color: white;
        }

        .LogoutButton {
            width: 100% !important;
            background: #3f9d2f !important;
            border-radius: 25px;
            color: white;
            height: 50px;
        }

        .mdc-chip {
            background-color: #3f9d2f !important;
            color: rgb(255, 255, 255) !important;
        }

        .AnimationDiv {
            transition-property: all;
            transition-property: transform;
            transition-duration: 0.3s;
        }
    </style>

    <style>
        a { /*make links a certain way*/
            font-weight: 500 !important;
            color: black !important;
            line-height: 2 !important;
            font-variant: all-small-caps !important;
            font-family: Roboto !important;
            padding: 10px !important;
            font-size: larger !important;
        }
    </style>

</head>



<TelerikRootComponent>
    <MatAppBarContainer>
        <MatAppBar Fixed="false" Style="height:48px; background-color:#3f9d2f  !important; color:#FFFFFF !important;">
            <MatAppBarRow Style="height:48px; ">
                <MatAppBarSection>

                    @if (Opened == true)
                    {
                        <div>
                            <MatIconButton OnClick="@((e) => ButtonClicked())"> <span class="fas fa-grip-lines"></span></MatIconButton>
                        </div>
                    }
                    else
                    {
                        <div>
                            <MatIconButton OnClick="@((e) => ButtonClicked())"> <span class="fas fa-grip-lines-vertical"></span></MatIconButton>
                        </div>
                    }
                    <MatAppBarTitle>
                        @ModuleName
                    </MatAppBarTitle>
                </MatAppBarSection>
            </MatAppBarRow>
        </MatAppBar>
        <MatAppBarContent>
        </MatAppBarContent>
    </MatAppBarContainer>

    <MatDrawerContainer Style="width:100%; overflow-y:hidden; min-height:100vh">
        <MatDrawer @bind-Opened="@Opened" Mode="@MatDrawerMode.Dismissible">
            <div class="Banner">
                <div>
                    <i class="fas fa-user-circle UserIcon"></i>
                    <MatH3 Class="BannerUsernameHeading">@Username</MatH3>
                    <MatH6 Class="BannerCompanyNameHeading">Company</MatH6>
                </div>
            </div>
            <div class="WideScreenClass">
                <br />
                <br />
                <TelerikMenu Data="@MenuItems" Orientation="Telerik.Blazor.MenuOrientation.Vertical"
                             UrlField="@nameof(MenuItem.Page)"
                             ItemsField="@nameof(MenuItem.SubSectionList)"
                             TextField="@nameof(MenuItem.Section)"
                             OnClick="@((MenuItem item) => OnClickHandler(item))">

                    <ItemTemplate Context="item">
                        @{
                            if (item.Section == "Site Access")
                            {
                                <NavLink href="@item.Page">@item.Section</NavLink> <br />
                                <MatChipSet>
                                    <MatChip Label="5"></MatChip>
                                </MatChipSet>
                            }
                            else
                            {
                                <NavLink href="@item.Page">@item.Section</NavLink> <br />
                            }

                        }
                    </ItemTemplate>
                </TelerikMenu>
                <div style="position:absolute; bottom:10px; width:100%; padding:10px;">

                    <img src="/images/CompanyLogo.png" style="width:200px; margin:auto; margin-left: 20px;" />
                    <br />

                    <Telerik.Blazor.Components.Button.TelerikButton Class="LogoutButton" OnClick="Logout">
                        LOGOUT
                    </Telerik.Blazor.Components.Button.TelerikButton>

                </div>
            </div>

            <div class="MobileClass">
                <TelerikMenu Data="@MobileMenuItems" Orientation="Telerik.Blazor.MenuOrientation.Vertical"
                             UrlField="@nameof(MenuItem.Page)"
                             ItemsField="@nameof(MenuItem.SubSectionList)"
                             TextField="@nameof(MenuItem.Section)"
                             OnClick="@((MenuItem item) => OnClickHandler(item))">



                </TelerikMenu>
            </div>
        </MatDrawer>
        <MatDrawerContent Style="overflow-y:hidden;">
            <div class="main">
                <div class="content px-4">
                    @Body
                </div>
            </div>
        </MatDrawerContent>

    </MatDrawerContainer>
</TelerikRootComponent>

@code {


    public MenuItem ClickedItem { get; set; }

    protected void OnClickHandler(MenuItem item)
    {
        ClickedItem = item;
        ModuleName = item.Section.ToString();
        Console.WriteLine("Telerik menu item: " + item.Section.ToString());
        Opened = !Opened;
    }

    
    public List<MenuItem> MenuItems { get; set; }

    public class MenuItem
    {
        public string Section { get; set; }
        public string Page { get; set; }
        public List<MenuItem> SubSectionList { get; set; }
    }

    public List<MenuItem> MobileMenuItems { get; set; }

    protected override void OnInitialized()
    {
        MenuItems = new List<MenuItem>()
{
                    new MenuItem()
                    {
                        Section = "Dashboard",
                        Page = "dashboard"
                    },
                    new MenuItem()
                    {
                        Section = "Site Access",
                        Page = "siteaccess"
                    },
                    new MenuItem()
                    {
                        Section = "History",
                        Page = "history"
                    },
                    new MenuItem()
                    {
                        Section = "Reports",
                        Page = "reports"
                    },
                    new MenuItem()
                    {
                        Section = "Settings",
                        Page = "settings"
                    },
                    new MenuItem()
                    {
                        Section = "Users",
                        Page = "users"
                    },
                    new MenuItem()
                    {
                        Section = "Vehicles",
                        Page = "vehicles"
                    },
                    new MenuItem()
                    {
                        Section = "Drivers",
                        Page = "drivers"
                    }
                };

        MobileMenuItems = new List<MenuItem>()
        {
                new MenuItem()
                {
                    Section = "Dashboard",
                    Page = "dashboard"
                },
                new MenuItem()
                {
                    Section = "Access Manager",
                    Page = "accessmanager"
                },
                new MenuItem()
                {
                    Section = "Yard Manager",
                    Page = "yardmanager"
                },
                new MenuItem()
                {
                    Section = "Vehicle Registration",
                    Page = "vehicleregistration"
                },
                new MenuItem()
                {
                    Section = "LOGOUT",
                    Page = "/"
                },
        };


    base.OnInitialized();
    }
 public void Logout()
    {
        UriHelper.NavigateTo("/");
    }


    public string ModuleName { get; set; } = "";

    bool Opened = true;

    string Name = "";

    public async Task GoToUsers()
    {
        ModuleName = "USERS";
        UriHelper.NavigateTo("/user");
    }

    public async Task CloseMenu(string name) //this method will close the menu, and set the page name as the module name at the top of the app bar
    {
        ModuleName = "";
        await Task.Delay(20);
        Opened = !Opened;
        await Task.Delay(20);
        ModuleName = name;
    }

    void ButtonClicked()
    {
        Opened = !Opened;
    }

    public string UserName { get; set; }
    public string UserID { get; set; }

    protected override async Task OnInitializedAsync()
    {
        
       
        UserID = await localStorage.GetItemAsync<string>("userID");

        ModuleName = "DASHBOARD";
       
        Username = await localStorage.GetItemAsync<string>("userName");

    }

    public string Username { get; set; }
    Modules modules = new Modules();
    GeneralConfiguration generalConfiguration = new GeneralConfiguration();

}

Marin Bratanov
Telerik team
 answered on 12 Sep 2019
5 answers
418 views

I am passing a collection of an Interface type as the datasource for a the Grid and when I try to render the page I get thr following error...

Unhandled exception rendering component: Cannot create an instance of an interface.
System.MissingMethodException: Cannot create an instance of an interface.
   at System.RuntimeTypeHandle.CreateInstance(RuntimeType type, Boolean publicOnly, Boolean wrapExceptions, Boolean& canBeCached, RuntimeMethodHandleInternal& ctor, Boolean& hasNoDefaultCtor)
   at System.RuntimeType.CreateInstanceDefaultCtorSlow(Boolean publicOnly, Boolean wrapExceptions, Boolean fillCache)
   at System.RuntimeType.CreateInstanceDefaultCtor(Boolean publicOnly, Boolean skipCheckThis, Boolean fillCache, Boolean wrapExceptions)
   at System.Activator.CreateInstance[T]()
   at Telerik.Blazor.Components.Grid.GridFilterHeaderBase`1.get_PropType()

I do not know the datasource actual concrete type until run time. Is there a way to work around this?

 

Thanks,

 

Jeff

Marin Bratanov
Telerik team
 answered on 09 Sep 2019
3 answers
712 views

I'm trying to get a DatePicker to display correctly in a page that's using Bootstrap `form-group` and `form-control` tags, but I'm not having much success. 

The TelerikDateInput component exposes the Class property, but I don't think the DatePicker (or at least it doesn't seem to from my experimentation and from the documentation?

I've tried various ways of doing this, e.g. 

<div class="form-group">
  <label for="dueDate" class="control-label  col-md-4">Expected Arrival Date: </label>
  <div class="col-md-8">
      <TelerikDatePicker Class="form-control" Format="dd/MM/yyyy" @bind-Value="@State.BillOfLadingVM.DueDate" />
  </div>           
  <ValidationMessage For="@(() => State.BillOfLadingVM.DueDate)" />
</div>

 

But I always get something along the lines of the attached image.

Is there any way to get this to work?

Marin Bratanov
Telerik team
 answered on 06 Sep 2019
4 answers
858 views
In testing I'm finding users keep forgetting to press the Update button on the grid.  Is there any way to make the grid update the data source on each data change and not require the use of the row Update buttons?
Marin Bratanov
Telerik team
 answered on 06 Sep 2019
2 answers
493 views
Hello Marin
I learn article about themes support and I use it https://docs.telerik.com/blazor-ui/themes
Also I was create own theme by your theme builder. It's work fine.
But i want to change themes as in your blazor demo site by select from dropdown list and change theme immediatelly.
Can you explain me short and right way how to do this.
Thank you.
Andriy
Top achievements
Rank 1
 answered on 05 Sep 2019
7 answers
132 views

Hi,

I guess we need an update for the binaries to support the latest preview....

Eric
Top achievements
Rank 1
 answered on 05 Sep 2019
1 answer
364 views

I've updated to .net preview 9 today and i'm running into an issue with the window components. the TelerikWindow component appears to not have an error, its the child components that appear to be having issues. 

TelerikWindowTitle

TelerikWindowActions

TelerikWindowContents

I believe the issue is caused by the following change in preview 9. 

"Replace Microsoft.AspNetCore.Components.UIEventArgs with System.EventArgs and remove the “UI” prefix from all EventArgs derived types (UIChangeEventArgs -> ChangeEventArgs, etc.)."

 

Any idea on when the Telerik Blazor components will be updated to support preview 9?

Marin Bratanov
Telerik team
 answered on 05 Sep 2019
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