The RadioGroup's FocusAsync() method does not work. To reproduce, run this example and press the button: https://docs.telerik.com/blazor-ui/components/radiogroup/overview#radiogroup-reference-and-methods
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A possible workaround is to use JavaScript to focus the first or the selected <input> element:
@inject IJSRuntime js
<TelerikButton OnClick="@FocusRadioGroup">Focus RadioGroup</TelerikButton>
<TelerikRadioGroup Data="@RadioGroupData"
Class="my-radiogroup"
@bind-Value="@RadioGroupValue"
ValueField="@nameof(ListItem.Id)"
TextField="@nameof(ListItem.Text)">
</TelerikRadioGroup>
@* Move JavaScript code to a separate JS file in production *@
<script suppress-error="BL9992">function focusRadio(RadioGroupValue) {
var mrg = RadioGroupValue == null ?
document.querySelector(".my-radiogroup .k-radio-list-item input") :
document.querySelector(`.my-radiogroup .k-radio-list-item input[value='${RadioGroupValue}']`);
if (mrg) {
mrg.focus()
}
}</script>
@code{
private int? RadioGroupValue { get; set; }
List<ListItem> RadioGroupData { get; set; } = new List<ListItem>() {
new ListItem { Id = 1, Text = "Foo" },
new ListItem { Id = 2, Text = "Bar" },
new ListItem { Id = 3, Text = "Baz" }
};
private async Task FocusRadioGroup()
{
await Task.Delay(1);
await js.InvokeVoidAsync("focusRadio", RadioGroupValue);
}
public class ListItem
{
public int Id { get; set; }
public string Text { get; set; } = string.Empty;
}
}
<TelerikRadioGroup Data="@RadioData"
@bind-Value="@ChosenOption"
ValueField="Child.Id"
TextField="Child.Text">
</TelerikRadioGroup>
@code {
public int ChosenOption { get; set; }
public class Parent<TItem>
{
public TItem Content { get; set; }
public Parent(TItem item)
{
Content = item;
}
}
public class Child
{
public int Id { get; set; }
public string Text { get; set; }
public Child(int id, string text)
{
Id = id;
Text = text;
}
}
public List<Parent<Child>> RadioData { get; set; } = new List<Parent<Child>>();
protected override void OnInitialized()
{
RadioData.Add(new Parent<Child>(new Child(0, "Item 1")));
RadioData.Add(new Parent<Child>(new Child(1, "Some text")));
RadioData.Add(new Parent<Child>(new Child(2, "Other text")));
RadioData.Add(new Parent<Child>(new Child(3, "Third text")));
base.OnInitialized();
}
}
I would like to be able to disable one or more radio buttons in the RadioGroup.
<AdminEdit>
The CSS workaround below uses the nth-child selector. In the example, I have disabled the third and fourth options and you can use it as a base and extend that sample in your own application.
<style>
.disabled-items li:nth-child(3),
.disabled-items li:nth-child(4) {
outline: none;
cursor: default;
opacity: 0.6;
-webkit-filter: grayscale(0.1);
filter: grayscale(0.1);
pointer-events: none;
box-shadow: none;
}
</style>
<TelerikRadioGroup Data="@GenderOptions"
@bind-Value="@ChosenGender"
ValueField="@nameof(GenderModel.GenderId)"
TextField="@nameof(GenderModel.GenderText)"
Class="disabled-items">
</TelerikRadioGroup>
@code{
TelerikRadioGroup<GenderModel, int?> RadioGroupRef { get; set; }
int ChosenGender { get; set; }
List<GenderModel> GenderOptions { get; set; } = new List<GenderModel>
{
new GenderModel { GenderId = 1, GenderText = "Female", isEnabled = true },
new GenderModel { GenderId = 2, GenderText = "Male", isEnabled = false },
new GenderModel { GenderId = 3, GenderText = "Other", isEnabled = true },
new GenderModel { GenderId = 4, GenderText = "Prefer not to say", isEnabled = true },
};
public class GenderModel
{
public int GenderId { get; set; }
public string GenderText { get; set; }
public bool isEnabled { get; set; }
}
}</AdminEdit>
- create a span before first LI as label
- UL shall reference span via aria-labelledby
- group label needs to look like a group label (it must be more significant/important than the radio labels)
As these elements are wrapped by the control this needs to be updated internally.
There is an attribute called AriaLabelledBy available on the control but it does not work. It would be good for the AriaLabelledBy attribute to do what it is supposed to do and make it work like the following code:
<h3 id="grouplabel1">Chosen gender: @( ChosenGender == 0 ? "no selection yet" : ChosenGender.ToString() )</h3>
<TelerikRadioGroup Data="@GenderOptions"
@bind-Value="@ChosenGender"
ValueField="@nameof(GenderModel.GenderId)"
TextField="@nameof(GenderModel.GenderText)" AriaLabelledBy="grouplabel1">
</TelerikRadioGroup>
@code {
TelerikRadioGroup<GenderModel, int?> RadioGroupRef { get; set; }
int ChosenGender { get; set; }
List<GenderModel> GenderOptions { get; set; } = new List<GenderModel>
{
new GenderModel { GenderId = 1, GenderText = "Female" },
new GenderModel { GenderId = 2, GenderText = "Male" },
new GenderModel { GenderId = 3, GenderText = "Other" },
new GenderModel { GenderId = 4, GenderText = "Prefer not to say" },
};
public class GenderModel
{
public int GenderId { get; set; }
public string GenderText { get; set; }
}
}----------ADMIN EDIT----------
A possible workaround is to wrap the RadioGroup inside a normal div and use the normal HTML aria-labelledby attribute:
<div role="radiogroup" aria-labelledby="group_label_1">
<h3 id="group_label_1" >Chosen gender: @( ChosenGender == 0 ? "no selection yet" : ChosenGender.ToString() )</h3>
<br />
<TelerikRadioGroup Data="@GenderOptions"
@bind-Value="@ChosenGender"
ValueField="@nameof(GenderModel.GenderId)"
TextField="@nameof(GenderModel.GenderText)">
</TelerikRadioGroup>
</div>
@code{
TelerikRadioGroup<GenderModel, int?> RadioGroupRef { get; set; }
int ChosenGender { get; set; }
List<GenderModel> GenderOptions { get; set; } = new List<GenderModel>
{
new GenderModel { GenderId = 1, GenderText = "Female" },
new GenderModel { GenderId = 2, GenderText = "Male" },
new GenderModel { GenderId = 3, GenderText = "Other" },
new GenderModel { GenderId = 4, GenderText = "Prefer not to say" },
};
public class GenderModel
{
public int GenderId { get; set; }
public string GenderText { get; set; }
}
}
I would like to have the option (similar to AJAX controls radiobuttonlist) to specify the number of columns a RadioGroup has. This would allow it to be evenly formatted no matter the text width and the ordering to go top to bottom and then left to right like below.
Since your control does not allow you to manually define child items, it becomes less useful than the built in InputRadioGroup control provided by Microsoft which allows me to set up the items and styling myself, which is what I use instead.
A RadioGroup inside a Grid EditorTemplate will fire OnBlur when the user clicks on it. This will close the edit cell and (usually) not apply the new value.
Here is a test page: https://blazorrepl.telerik.com/wvbmkMvd48rpMN4547
When I test the accessibility of the TelerikRadioGroup I have found out issues.