Good morning.

I want to display some string to the X and Y axes of a Chart.
As far as I'm able to tell from the source code, ChartAxisScaleLabel seems to be the appropriate type to encapsulate options for this.
However, ChartOptions doesn't contain any references to this class or any option I can use to set axis titles. In fact, there aren't any references to ChartAxisScaleLab, as far as I can tell.

What's the intended way to display axis titles in Blazorise.Charts?

Thank you for your help in advance.

Are you on Blazorise v1.0.x? The options class that you mention is only introduced with the last version.

Yes, currently on v1.0.0.

I don't how it happens but yes, you're right. The ChartAxisScaleLabel is not referenced anywhere. I need to investigate of it valid anymore or it can be removed altogether.

Alright, keep me posted :) If there's any other way to get to display scale titles, let me know.

So you need to show these?

No, I want to display the scale title (in your figure above, that would be "Kelvins", which makes me very hopeful that I've overlooked something).

In that case just do this https://github.com/Megabit/Blazorise/blob/master/Demos/Blazorise.Demo/Pages/Tests/ChartsPage.razor.cs#L36

What version of Blazorise is that for? On 1.0.0, ChartAxis (which is the options type of lineChartOptions.Scales.Y) doesn't have a property named "Text", and I get a build error.

It's on 1.0.5. We added some missing chart option APIs with each update from 1.0.0.

Yes, I've updated my package reference to Blazorise.Chart==1.0.5 and "Title" is indeed a Property of ChartAxis, which is great. However, after following the example you linked to (in particular, instantiating the Text option using a string literal) I the following error in the browser console:
Unhandled exception rendering component: Property accessor 'IndexedValues' on object 'Blazorise.Charts.IndexableOption`1[[System.String, System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]]' threw the following exception:'This instance represents a single value. The indexed values are not available.'

After looking a little bit in the source code I'm guessing this is the throwing line: https://github.com/Megabit/Blazorise/blob/67da3e1fb3256f83f25eb378026eda10768322b5/Source/Extensions/Blazorise.Charts/IndexableOption.cs#L35

Can you post a snippet of your chart options?

Sure thing:

private LineChartOptions Options { get; set; } = new() {
    AspectRatio = 1.5,
    Scales = new() {
        X = new() {
            Title = new() {
                Display = true,
                Text = "X scale title"
            }
        },
        Y = new() {
            Title = new() {
                Display = true,
                Text = "Y scale title"
            }
        }
    }
};

A little more info: The stack trace indicates that this is the line where the exception is raised, and in particular Converters.ToDictionary( Options ).

A fuller exception stack trace:
---> System.InvalidOperationException: This instance represents a single value. The indexed values are not available.
at Blazorise.Charts.IndexableOption1[[System.String, System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].get_IndexedValues() at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture) --- End of inner exception stack trace --- at System.ComponentModel.ReflectPropertyDescriptor.GetValue(Object component) at Blazorise.Utilities.Converters.ToDictionary(Object source, Boolean addEmptyObjects, Boolean forceCamelCase) at Blazorise.Utilities.Converters.<ToDictionary>g__ProcessValue|1_0(Object value, Boolean emitDefaultValue, <>c__DisplayClass1_0& ) at Blazorise.Utilities.Converters.ToDictionary(Object source, Boolean addEmptyObjects, Boolean forceCamelCase) at Blazorise.Utilities.Converters.<ToDictionary>g__ProcessValue|1_0(Object value, Boolean emitDefaultValue, <>c__DisplayClass1_0& ) at Blazorise.Utilities.Converters.ToDictionary(Object source, Boolean addEmptyObjects, Boolean forceCamelCase) at Blazorise.Utilities.Converters.<ToDictionary>g__ProcessValue|1_0(Object value, Boolean emitDefaultValue, <>c__DisplayClass1_0& ) at Blazorise.Utilities.Converters.ToDictionary(Object source, Boolean addEmptyObjects, Boolean forceCamelCase) at Blazorise.Utilities.Converters.<ToDictionary>g__ProcessValue|1_0(Object value, Boolean emitDefaultValue, <>c__DisplayClass1_0& ) at Blazorise.Utilities.Converters.ToDictionary(Object source, Boolean addEmptyObjects, Boolean forceCamelCase) at Blazorise.Charts.BaseChart4.

I'm trying your options all is fine in the demo app

Can you also post your Data settings?

Is it the LineChartDataset instances you mean?
If so, these are created as

var dataset = new LineChartDataset<float> {
	Label = "Label for dataset",
	Data = <A List<float> instance>,
	Fill = false,
	Stepped = true,
	Hidden = false
}

which are attached to the linechart with

await lineChart.AddLabelsDatasetsAndUpdate( <a string[] instance>, dataset);
await lineChart.SetOptions(Options);

Okey, so I followed the demo you linked to a little more closely, and a difference between my code and yours was that I set the options using await lineChart.SetOptions( Options ) right around when I'm adding the dataset. But in the demo the options are set in the razor file as
<LineChart @ref="lineChart" TItem="float" Options="@Options">

After changing to the latter variant it works for me too.

My hypothesis:

• BaseChart.SetOptions uses Blazorise.Utilities.Converters.ToDictionary( Options ) (https://github.com/Megabit/Blazorise/blob/master/Source/Extensions/Blazorise.Charts/BaseChart.cs#L225)
• ToDictionary iterates over all properties, which includes both IndexableOption<T>.IndexedValue and IndexableOption<T>.SingleValue as properties of IndexableOption<T>. (https://github.com/Megabit/Blazorise/blob/master/Source/Blazorise/Utilities/Converters.cs#L92)
• Thus, for ChartOptions.Scales.X.Title.Text, both Text.SingleValue and Text.IndexedValues are iterated over in ToDictionary and one of them will always throw an exception.