Questions on UI for ASP.NET Core Forum

1 answer

197 views

Where is SelectedValue on DropDownTree-Item?

How do you set, and get back the selected value of an dropdownlist-item set through local data binding? Here you can see that I have a list of judges, and a list of court dates for each judge, I would like to be able to set, and get back the id of each court date in the PostBack in razor pages. How do I do so?

<kendo-dropdowntree name="dropdowntree" auto-width="true" >
<items>
@{
foreach (var judge in @Model.JudgesTreeView)
{
<dropdowntree-item text="@judge.Name" title="@judge.Name">
<items>
@{
foreach (var hearings in judge.HearingDate)
{
<dropdowntree-item text="@hearings.Text" >
</dropdowntree-item>
}
}
</items>
</dropdowntree-item>
}
}
</items>
</kendo-dropdowntree>

DropDownTree

answered on 24 Mar 2023

1 answer

133 views

How to ensure grid has values returned from its Data method

Have a similar scenario as below (taken from example)
https://docs.telerik.com/aspnet-core/html-helpers/data-management/grid/faq

However, in my case, the "additionalData" method is trying to read the values from a Kendo DropDownlist, that has its own .Read method and it appears the Grid is trying to load via its Read method before the dropdown has finished loading via the controller method it calls. How can I ensure the grids .Data method has all its vallues available before its .Read method is called. The Dropdown's read method doesnt return in time before it returns its JSON object with one of its values is null and this causes the grid .Read method to take way too long.

// Omitted for brevity.
.DataSource(dataSource => dataSource.Ajax()
.Read(read => read
.Action("Read", "Home")
.Data("additionalData")
)
)
// Omitted for brevity.
<script>
function additionalData() {
return {
userID: 42,
search: $("#search").val()
};
}
</script>

DropDownList

answered on 23 Mar 2023

1 answer

509 views

Wizard will not render when using a form

First time using the Wizard control and I am running into a serious problem. Here is the console error I receive when I try to run:

Uncaught DOMException: Failed to execute 'setAttribute' on 'Element': '$id' is not a valid attribute name.
    at attr (https://kendo.cdn.telerik.com/2023.1.314/js/jquery.min.js:4:11364)
    at Y (https://kendo.cdn.telerik.com/2023.1.314/js/jquery.min.js:3:4598)
    at Y (https://kendo.cdn.telerik.com/2023.1.314/js/jquery.min.js:3:4436)
    at Te.fn.init.attr (https://kendo.cdn.telerik.com/2023.1.314/js/jquery.min.js:4:10935)
    at string (https://kendo.cdn.telerik.com/2023.1.314/js/kendo.all.min.js:10:1312585)
    at init.editor (https://kendo.cdn.telerik.com/2023.1.314/js/kendo.all.min.js:10:1315704)
    at init.refresh (https://kendo.cdn.telerik.com/2023.1.314/js/kendo.all.min.js:10:1317046)
    at new init (https://kendo.cdn.telerik.com/2023.1.314/js/kendo.all.min.js:10:1314677)
    at HTMLDivElement.<anonymous> (https://kendo.cdn.telerik.com/2023.1.314/js/kendo.all.min.js:9:40719)
    at Function.each (https://kendo.cdn.telerik.com/2023.1.314/js/jquery.min.js:2:2898)

This happens in any time I try to add anything more than just Content items. Here is my page using the sample code I found in Telerik's Github repo:

@page
@model WilliamsKastner.Pages.CreateCarrierInvoiceModel
@{
	ViewData["Title"] = "Create Carrier Invoice";
}
@inject Microsoft.AspNetCore.Antiforgery.IAntiforgery Xsrf
@{
	var token = Xsrf.GetAndStoreTokens(HttpContext).RequestToken;
}

<h2 style="text-align: center;">Create Carrier Invoice</h2>
<p style="text-align: center;">Please select whether you want to create an end of month or end of quarter invoice. Verify the dates and click the Next button to continue.</p>
<hr class="dividerBar"/>
@(Html.Kendo().Wizard()
    .Name("wizard")
    .Tag("form")
    .Events(ev => ev.Done("wizardDone"))
    .HtmlAttributes(new { url = @Url.Page("CreateCarrierInvoice"), method = "POST" })
    .Steps(s =>
    {
        s.Add<CreateCarrierInvoiceModel.UserModel>()
        .Title("Account Details")
            .Form(f => f
                .Validatable(v =>
                {
                    v.ValidateOnBlur(true);
                    v.ValidationSummary(vs => vs.Enable(false));
                })
                .FormData(Model.UserViewModel)
                .Items(items =>
                {
                    items.Add().Field(p => p.AccountDetails.Username).Label(l => l.Text("Username:")).InputHtmlAttributes(new { required = "required", validationMessage = "Username is required !" });
                    items.Add().Field(p => p.AccountDetails.Email).Label(l => l.Text("Email:")).InputHtmlAttributes(new { type = "email", required = "required", validationMessage = "Email is not valid !" });
                    items.Add().Field(p => p.AccountDetails.Password).Label(l => l.Text("Password:")).InputHtmlAttributes(new { @type = "password", required = "required", validationMessage = "Password is required !" }).Hint("Hint: enter alphanumeric characters only.");
                })
            )
            .Buttons(b =>
            {
                b.Next();
            });

        s.Add<CreateCarrierInvoiceModel.UserModel>()
            .Title("Personal details")
            .Form(f => f
                .Validatable(v =>
                {
                    v.ValidateOnBlur(true);
                    v.ValidationSummary(vs => vs.Enable(false));
                })
                .FormData(Model.UserViewModel)
                .Items(items =>
                {
                    items.Add().Field(p => p.PersonalDetails.FullName).Label(l => l.Text("Full Name:")).InputHtmlAttributes(new { required = "required", validationMessage = "Full Name is required !" });
                    items.Add()
                        .Field(p => p.PersonalDetails.Country)
                        .Label(label => label.Text("Country:"))
                        .Editor(e =>
                        {
                            e.AutoComplete()
                            .DataTextField("Text")
                            .BindTo(new List<SelectListItem>() {
                                new SelectListItem() {
                                    Text = "France",
                                },
                                new SelectListItem() {
                                    Text = "Germany",
                                },
                                new SelectListItem() {
                                    Text = "Italy",
                                },
                                new SelectListItem() {
                                    Text = "Netherlands",
                                },
                                new SelectListItem() {
                                    Text = "Norway",
                                },
                                new SelectListItem() {
                                    Text = "Spain",
                                }
                            });
                        });


                    items.Add()
                        .Field(p => p.PersonalDetails.About)
                        .Label(l => l.Text("About:").Optional(true));
                })
            )
            .Buttons(b =>
            {
                b.Previous();
                b.Next();
            });

        s.Add().Content("<h3>Click on the \"Done\" button to complete your registration.</h3>");


    })
)
<script>

	function wizardDone(e) {
		$("#wizard").append($("<input type='hidden' name='__RequestVerificationToken' value='@token' data-stop='true' />"))
	}

</script>

And finally, the code behind for the page:

using System.ComponentModel.DataAnnotations;
using Microsoft.AspNetCore.Identity;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Mvc.RazorPages;
using WilliamsKastner.Data;

namespace WilliamsKastner.Pages
{
    public class CreateCarrierInvoiceModel : PageModel
    {
        [BindProperty]
        public CarrierInvoiceModel InvoiceViewModel { get; set; }

        [BindProperty]
        public UserModel UserViewModel { get; set; }
        
        //[BindProperty(SupportsGet = true)]
        //public string InvoiceTypeID { get; set; }

        private readonly ExtranetDbContext _context;
        private readonly UserManager<ExtranetUser> _userManager;

        public CreateCarrierInvoiceModel(ExtranetDbContext context, UserManager<ExtranetUser> InjectedUser)
        {
            _context = context;
            _userManager = InjectedUser;
        }

        public void OnGet()
        {
            UserViewModel = new UserModel()
            {
                AccountDetails = new Account()
                {
                    Username = "kev123",
                    Email = "kevin@mymail.com"
                },
                PersonalDetails = new Person()
                {
                    FullName = "Kevin Carter",
                    Country = "Norway"
                }
            };
            
            //InvoiceViewModel = new CarrierInvoiceModel
            //{
            //    EndDate = "This is a test",
            //    Period = "0",
            //    StartDate = "This is another test",
            //    UserID = ""
            //};
        }

        public IActionResult OnPost()
        {
	        var model = Request.Form;

	        if (!ModelState.IsValid)
	        {
		        return Page();
	        }

	        return RedirectToPage("Success");
        }

        public class CarrierInvoiceModel
        {
	        [Required]
	        public string Period { get; set; }
	        [Required]
	        public string StartDate { get; set; }
	        [Required]
	        public string EndDate { get; set; }
	        public string? UserID { get; set; }
        }
        public class UserModel
        {
            public Account AccountDetails { get; set; }
            public Person PersonalDetails { get; set; }
        }

        public class Account
        {
            [Required]
            public string Username { get; set; }

            [Required]
            public string Email { get; set; }

            [Required]
            public string Password { get; set; }
        }

        public class Person
        {
            [Required]
            public string FullName { get; set; }

            [Required]
            public string Country { get; set; }
            public string About { get; set; }
        }
    }
}

This is the Head tag in the _Layout file:

		@{
			var kendoVersion = "2023.1.314";
		}
		<script src="https://kendo.cdn.telerik.com/@kendoVersion/js/jquery.min.js"></script>
		<link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.0-alpha1/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-GLhlTQ8iRABdZLl6O3oVMWSktQOp6b7In1Zl3/Jr59b6EGGoI1aFkw7cmDA6j6gD" crossorigin="anonymous">
		<link rel="stylesheet" href="~/css/site.css" asp-append-version="true" />
		<link href="https://kendo.cdn.telerik.com/themes/6.2.0/bootstrap/bootstrap-main.css" rel="stylesheet" type="text/css" />
		<script src="https://kendo.cdn.telerik.com/@kendoVersion/js/jszip.min.js"></script>
		<script src="https://kendo.cdn.telerik.com/@kendoVersion/js/kendo.all.min.js"></script>
		<script src="~/kendo-ui-license.js"></script>
		<script src="https://kendo.cdn.telerik.com/@kendoVersion/js/kendo.aspnetmvc.min.js"></script>
		<script src="https://cdn.jsdelivr.net/npm/bootstrap@5.3.0-alpha1/dist/js/bootstrap.bundle.min.js" integrity="sha384-w76AqPfDkMBDXo30jS1Sgez6pr3x5MlQ1ZAGC+nuZB+EYdgRZgiwxhTBTkF7CXvN" crossorigin="anonymous"></script>

FYI, I have tried every v5 version of Bootstrap. If I download and run the sample solution from Github, all of the steps are rendered together on the page - in other words, all steps are shown and none hidden. And if I just put 3 Content items here, the Wizard shows all 3 as steps and everything just works.

What in the world am I doing wrong? All of the other Telerik UI controls that I am using (Grid and Chart) work as expected. Just not the Wizard.

Wizard

answered on 23 Mar 2023

1 answer

209 views

Header and footer always visible in every page?

Hi,

My website layout contains a nav, main and footer part (see attached file).

Is it possible to have the nav (header) and footer always visible on the page?

If I now have a long main part, the footer is at startup not visible and when scrolling the header will disappear.

Thanks and best regards

General Discussions

answered on 22 Mar 2023

1 answer

286 views

How to disable popup if no data is found, DropDownList / Multiselect

Hello,

How do I disable popup if no DropDownList/Multiselect contains no data or filtering does not find any items using html helpers:

@(
Html.Kendo().DropDownList()
.Name("Testi")
.DataTextField("Text")
.DataValueField("Value")
.BindTo(Source)
)

If I instantate controls using jQuery I would get this done setting noDataTemplate to false:
$("#Testi").kendoDropDownList({ noDataTemplate: false, ..

On html helpers there is no option to set NoDataTemplate boolean value and setting string value empty or null does not work.

Mikko

DropDownList

MultiSelect

answered on 21 Mar 2023

1 answer

125 views

Add a scope attribute to KendoUI Grid for 508 Compliance

I need to add a scope attribute to make the KendoUI Grid 508 Compliant. How do I do that?

@(Html.Kendo().Grid <PGC.Administration.ViewModels.UsersVM>()
.Name("users")
.Columns(columns =>
{
columns.Bound(p => p.UserName);
columns.Bound(p => p.FirstName);
columns.Bound(p => p.LastName);
columns.Bound(p => p.Email);
columns.Bound(p => p.LastLoginDate).Format("{0:MM/dd/yyyy hh:mm}");
columns.Bound(p=> p.UserPONames).Title("Program Office Names");
columns.Bound(p=> p.UserRoleName).Title("User Role Names");
columns.Command(command => { command.Custom("Edit").Click("showCreate");@* command.Destroy().Text(" ");*@ }).Width(150);
})

Grid

answered on 20 Mar 2023

0 answers

489 views

TabStrip .Selected(true) and .SelectedIndex(...) broken

Hi all,

I'm having an issue with my TabStrip code.

Basically, .Selected and .SelectedIndex do not work to open the given tab when the page loads. I have to manually click on a tab to display it, and there is some strange formatting that makes it seem like the desired tab was selected but it was never displayed (borders around the tab etc).

I can pinpoint precisely the version of the NuGet package where this problem is introduced, and can confirm it exists up to the latest.

Code excerpt:

@(Html.Kendo().TabStrip()
    .Name(Model.SessionId + "_SessionPanelTabStrip")
    .Animation(animation => animation.Open(effect => effect.Fade(FadeDirection.In)))
    .Items(ts =>
    {
        ts.Add().Text("General")
            .Selected(true)
            .LoadContentFrom("SessionPanelGeneral", "Sessions", new {sessionId = Model.SessionId});

and this goes on further. This code works as expected up to and including the NuGet package Telerik.UI.for.AspNet.Core 2022.2.621. Any version after that, from 2022.2.802 up to and including the latest as of writing this post (2023.1.314) exhibit the issue where the tab is not selected by default when .Selected is true.

For now I am just using the older version that is working, but I would like to upgrade at some stage to get all of the other changes in later versions. It would great if this could be fixed, whether on my end or in a future release.

Thanks

TabStrip

asked on 17 Mar 2023

2 answers

137 views

ClientDetailTemplate - Update Handler

I got a grid that displays orders and details

This is the main grid:

@(
          Html.Kendo().Grid<BoWeb.Web.Models.OrderModel>().Name("gridOrders")
            .Sortable()
            .Scrollable()
            .Columns(cols =>{
              cols.Bound(col => col.OrderNr);
              cols.Bound(col => col.CreateDate).Format("{0:dd.MM.yyyy hh:mm}");
              cols.Bound(col => col.PaymentResource);
              cols.Bound(col => col.ShippingResource);
              cols.Bound(col => col.ShippingSurcharge);
              cols.Bound(col => col.TotalIncl);
            })
            .ClientDetailTemplateId("tmplOrderItem")
            .DataSource(ds => ds
              .Ajax()
              .Read(r => r.Url("/Customer/Admin?handler=ReadOrders").Data("forgeryToken"))
              .Model(m =>{
                m.Id(id => id.PKOrder);
              })
            )
            .Deferred()
        )

This works fine.

The template looks like this:

<script id="tmplOrderItem" type="text/kendo-tmpl">
  @(
    Html.Kendo().Grid<BoWeb.Web.Models.OrderItem>().Name("gridCart_#=PKOrder#")
      .Sortable()
      .Editable(edit => edit.Mode(GridEditMode.InLine))
      .Columns(cols =>{
        cols.Bound(col => col.Quantity).EditorTemplateName("IntegerEditor");
        cols.Bound(col => col.Caption);
        cols.Bound(col => col.SinglePriceIncl);
        cols.Bound(col => col.TotalPriceIncl);
        cols.Command(col =>
        {
          col.Edit().Text(" ").UpdateText(" ").CancelText(" ");
        }).Width(120);
      })
      .DataSource(ds => ds
        .Ajax()
        .Read(r => r.Url("/Customer/Admin?handler=ReadOrderItems&orderId=#=PKOrder#").Data("forgeryToken"))
        .Update(u => u.Url("/Customer/Admin?handler=UpdateOrderItem").Data("forgeryToken"))
        .Model(m =>
        {
          m.Id(id => id.FKSubItem);
          m.Field(f => f.Quantity);
          m.Field(f => f.Caption).Editable(false);
          m.Field(f => f.SinglePriceIncl).Editable(false);
          m.Field(f => f.TotalPriceIncl).Editable(false);
        })
      )
      .ToClientTemplate()
  )
</script>

The read works. No problem and data is displayed correctly.

But the update-handler is not called.

The handler looks like this:

public JsonResult OnPostUpdateOrderItem([DataSourceRequest]DataSourceRequest request, OrderItem item)
    {
      if(item != null && ModelState.IsValid)
      {

      }
      return new JsonResult(new[] { item }.ToDataSourceResult(request, ModelState));
    }

I also inject Xsrf and added

@Html.AntiForgeryToken()

Of course there is also the

@Html.Kendo().DeferredScripts()

Any ideas why this is not working?

Grid

answered on 15 Mar 2023

0 answers

250 views

Find ID of selected item from Listbox

I'm using two related listboxes to transfer data from one list to another. In my backend, when I reference Request.Form["lstAssociated"] I can get a list of the id's from the listbox that contains the item I selected to send to the other list, however, I don't see anywhere in the data how I can obtain the ID of just the item I have selected. We are using Razor forms.

ListBox