I need to make a tooltip more accessible.

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ADMIN EDIT

The first thing you can do is use the aria-describedby on the tooltip targets and use its value in the tooltip Id parameter to help screen readers. It is up to the screen reader to detect the change in the DOM and read out the new content.

This item is to add attributes to the tooltip such as role="tooltip", aria-live="polite", role="presentation", aria-hidden="false". The exact attributes will depend on more detailed research and may differ from what I have listed here.

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There's no way for me to specify a tooltip with both Hover and Click support.

I would like my tooltip to work for both desktop and mobile.  Is there any way to do this?



This is what I'm doing now:

<TelerikTooltip  ShowOn="@TooltipShowEvent.Click" TargetSelector="@("#val" + FieldName)" />



Here's what I'm looking to do:

<TelerikTooltip  ShowOn="@TooltipShowEvent.Both" TargetSelector="@("#val" + FieldName)" />

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ADMIN EDIT

This feature most probably will introduce a breaking change.

You can workaround this with using multiple TelerikTooltip declarations.

Check the attached file to see a sample implementation.

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How can I set the tooltip to show/hide programmatically? right not it only supports hover or click show action.

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ADMIN EDIT

You can Follow a way to hide the tooltip programmatically here: https://feedback.telerik.com/blazor/1476364-close-tooltip-via-method.

You can find a way to hack the show event by triggering a JS click in this KB article: https://docs.telerik.com/blazor-ui/knowledge-base/common-validation-error-in-tooltip.

Here is an example that shows how you can trigger the tooltip to show for a particular target:

@inject IJSRuntime _js

<script suppress-error="BL9992">
    function triggerTooltip(index, selector, showOnClick) {
        var targets = document.querySelectorAll(selector);
        if (targets && targets.length >= index) {
            var desiredTarget = targets[index];//feel free to get the desired target in any other way
            setTimeout(function () {
                var evt = document.createEvent('MouseEvent');
                var evtToSimulate = showOnClick ? "click" : "mouseenter";
                evt.initEvent(evtToSimulate, true, false);
                desiredTarget.dispatchEvent(evt);
            }, 20);
        }
    }
</script>

<TelerikButton OnClick="@( async () => await TriggerTooltip(0) )">Trigger tooltip for the first target</TelerikButton>
<TelerikButton OnClick="@( async () => await TriggerTooltip(1) )">Trigger tooltip for the SECOND target</TelerikButton>

<TelerikTooltip TargetSelector="@ttipTargetSelector" ShowOn="@ShowOnSetting">
</TelerikTooltip>



<p id="my-targets">
    <strong title="what is 'lorem ipsum'?">lorem</strong>
    ipsum dolor
    <strong title="is this a real word?">sit</strong>
    amet.
</p>

@code{
    string ttipTargetSelector = "p#my-targets [title]";
    TooltipShowEvent ShowOnSetting { get; set; } = TooltipShowEvent.Click;
    async Task TriggerTooltip(int targetIndex)
    {
        await _js.InvokeVoidAsync("triggerTooltip", 
                targetIndex, 
                ttipTargetSelector, 
                ShowOnSetting == TooltipShowEvent.Click ? true : false
             );
    }
}

---

I am getting the following error with them *only* when loading my site on an iPhone, after the page had been previously loaded on a PC.

2020-11-02T16:19:51.547Z] Error: Microsoft.JSInterop.JSException: An exception occurred executing JS interop: The JSON value could not be converted to System.Double. Path: $ | LineNumber: 0 | BytePositionInLine: 4.. See InnerException for more details.
 ---> System.Text.Json.JsonException: The JSON value could not be converted to System.Double. Path: $ | LineNumber: 0 | BytePositionInLine: 4.
 ---> System.InvalidOperationException: Cannot get the value of a token type 'Null' as a number.
   at System.Text.Json.Utf8JsonReader.TryGetDouble(Double& value)
   at System.Text.Json.Utf8JsonReader.GetDouble()
   at System.Text.Json.Serialization.Converters.JsonConverterDouble.Read(Utf8JsonReader& reader, Type typeToConvert, JsonSerializerOptions options)
   at System.Text.Json.JsonPropertyInfoNotNullable`4.OnRead(ReadStack& state, Utf8JsonReader& reader)
   at System.Text.Json.JsonSerializer.HandleNull(Utf8JsonReader& reader, ReadStack& state)
   at System.Text.Json.JsonSerializer.ReadCore(JsonSerializerOptions options, Utf8JsonReader& reader, ReadStack& readStack)
   --- End of inner exception stack trace ---
   at System.Text.Json.ThrowHelper.ReThrowWithPath(ReadStack& readStack, Utf8JsonReader& reader, Exception ex)
   at System.Text.Json.JsonSerializer.ReadCore(JsonSerializerOptions options, Utf8JsonReader& reader, ReadStack& readStack)
   at System.Text.Json.JsonSerializer.ReadValueCore(JsonSerializerOptions options, Utf8JsonReader& reader, ReadStack& readStack)
   at System.Text.Json.JsonSerializer.ReadValueCore(Utf8JsonReader& reader, Type returnType, JsonSerializerOptions options)
   at System.Text.Json.JsonSerializer.Deserialize(Utf8JsonReader& reader, Type returnType, JsonSerializerOptions options)
   at Microsoft.JSInterop.JSRuntime.EndInvokeJS(Int64 taskId, Boolean succeeded, Utf8JsonReader& jsonReader)
   --- End of inner exception stack trace ---
   at Microsoft.JSInterop.JSRuntime.InvokeWithDefaultCancellation[T](String identifier, Object[] args)
   at Telerik.Blazor.Components.TelerikTooltip.OnAfterRenderAsync(Boolean firstRender)

I want to have an option to prevent tooltips from closing and having multiple tooltips attached to different elements, all visible simultaneously/independently.

When you move the mouse over the grid cells in this example, several tooltips can remain shown, especially if you move the mouse down so it goes through a tooltip when going towards the next row, and you move it quickly.

<div class="row">
    <TelerikGrid Data="@Items">
        <RowTemplate Context="sampleData">
            @{
                string detailLink = $"info/{sampleData.Id}";
                string className = $"screenshot-hover-{sampleData.Id}";
                string selector = $".{className}";
                <td title="@sampleData.Name" data-id="@sampleData.Id" class="@className">
                    <NavLink href="@detailLink">@sampleData.Name</NavLink>
                </td>
                <td title="@sampleData.Name" data-id="@sampleData.Id" class="@className">
                    <NavLink href="@detailLink">@sampleData.Name</NavLink>
                </td>
                <td title="@sampleData.Name" data-id="@sampleData.Id" class="@className">
                    <NavLink href="@detailLink">@sampleData.Name</NavLink>
                </td>
                <TelerikTooltip TargetSelector="@selector" ShowOn="@TooltipShowEvent.Hover" Position="@TooltipPosition.Bottom">
                    <Template Context="ttipContext">
                        @{
                            var dataAttributes = ttipContext.DataAttributes;
                            var title = ttipContext.Title;
                            if (title != null && dataAttributes.ContainsKey("id"))
                            {
                                <img src="images/@(dataAttributes["id"])" alt="@title" />
                                <p>@title</p>
                            }
                        }
                    </Template>
                </TelerikTooltip>
            }
        </RowTemplate>

        <GridColumns>
            <GridColumn Field="@(nameof(SampleData.Name))" />
            <GridColumn Field="@(nameof(SampleData.Address))" />
            <GridColumn Field="@(nameof(SampleData.PhoneNumber))" />
        </GridColumns>
    </TelerikGrid>
</div>

@code {
    class SampleData
    {
        public int Id { get; set; }
        public string Name { get; set; }
        public string Address { get; set; }
        public string PhoneNumber { get; set; }
    }

    SampleData[] Items { get; set; }

    protected async override Task OnInitializedAsync()
    {
        const int sampleSize = 25;
        Items = new SampleData[sampleSize];
        for (int i = 0; i < sampleSize; i++)
        {
            Items[i] = new SampleData
            {
                Id = i,
                Name = $"{i}.SomeName",
                Address = $"{i}{i}{i}{i} Cherry Lane",
                PhoneNumber = $"1-512-{i % 100:00}4-6000",
            };

        }

        await Task.CompletedTask;
    }
}

When I have some dynamic content inside the tooltip template, the tooltip seems not to be re-rendering. E.g. when I have a tooltip with a text input and button and wish to disable the button when no text is entered, the tooltip seems to be only refreshing after closing and re-opening it. Simplified example:

<TelerikTooltip TargetSelector=".search-tooltip" Position="TooltipPosition.Bottom" ShowOn="TooltipShowEvent.Click">
	<Template>
		<TelerikTextBox @bind-Value="@SearchText"></TelerikTextBox>
		<TelerikButton OnClick="@Search" Enabled="@(!string.IsNullOrEmpty(SearchText))">Search</TelerikButton>
	</Template>
</TelerikTooltip>

Even tried using the ValueChanged event of the TelerikTextBox and calling the StateHasChanged() method but had the same result (the enabled/disabled state of button only changed after closing&re-opening the tooltip).

I would expect the binding and re-rendering to work as normally in Blazor. Is there a way to manually 'call refresh' on the tooltip?

I would like to be able to do something like the following - cause the tooltip to close from my code:

<TelerikTooltip TargetSelector="#tooltip1" ShowOn="@TooltipShowEvent.Click" @ref="@TooltipRef">     
            <Template>
                 Content Here
                <button type="button" class="btn btn-primary" @onclick="tipClose">Save</button>                
            </Template>
</TelerikTooltip>

<a href="#" id="tooltip1" class="btn btn-secondary">open</a>

@code{
 Telerik.Blazor.Components.TelerikTooltip TooltipRef { get; set; }

void tipClose()
    {
       // TooltipRef ?
    }


}

1. Place two spans with titles right next to each other.

2. Add Telerik Tooltip with target span[title]

3. Hover over first span -> Tooltip is displayed correctly

4. Move Mouse Cursor from first span to second span -> Tooltip of second span is displayed twice: Once at correct position and once at top left of screen.

Unfortunately the tooltip component does only work for elements that are present at first rendering.

If elements are surrounded by an if-condition which becomes true at a later point in time, the tooltip is not displayed.

Our usecase:  We have tables where some data is computed after displaying the rest of the table.  The computing and displaying works and the title is there (and shown in the default windows tooltip) but the Telerik tooltip is not displayed.