Struct ChartJsPoint

#[non_exhaustive]
pub struct ChartJsPoint<T, U> {
    pub formatted_value: String,
    pub label: String,
    pub dataset: ChartJsPointDataset,
    pub raw: Coordinate<T, U>,
}

A representation in rust of a ChartJS poinrt, generally exposed via the tooltips plugin

Fields (Non-exhaustive)

Non-exhaustive structs could have additional fields added in future. Therefore, non-exhaustive structs cannot be constructed in external crates using the traditional Struct { .. } syntax; cannot be matched against without a wildcard ..; and struct update syntax will not work.

formatted_value: String

Probably don’t use this

label: String

Probably don’t use this

dataset: ChartJsPointDataset

Details about the dataset that are seen by the viewer of the chart

raw: Coordinate<T, U>

The raw coordinate value for the point

Implementations

impl<T, TE, U, UE> ChartJsPoint<T, U>

where T: FromStr<Err = TE> + Debug, U: FromStr<Err = UE> + Debug, TE: Error + Sync + Send + 'static, UE: Error + Sync + Send + 'static,

pub fn parse(val: JsValue) -> Result<Self, CoordinateError>

This should be used for parameter of crate::objects::TooltipCallbacks::label

1. first create a function

#[wasm_bindgen]
pub fn tooltip_value_callback(context: JsValue) -> JsValue {
   match ChartJsPoint::<NaiveDate, Dollars>::parse(context) {
       Ok(val) => {
           let label = val.dataset.label;
           let y = val.raw.y.format();
           JsValue::from_str(&format!("{label}: {y}"))
       }
       Err(e) => {
           console_dbg!("Error parsing", e);
           JsValue::from_str("")
       }
   }
}

2. then use with the builder:

ChartOptions::new()
.plugins(
    ChartPlugins::new()
        .tooltip(
            TooltipPlugin::new().callbacks(
                TooltipCallbacks::new()
                    .label(
                        FnWithArgs::<1>::new()
                            .run_rust_fn(tooltip_value_callback),
                    )
            ),
        ),
)

pub fn parse_array(val: JsValue) -> Result<Vec<Self>, CoordinateError>

This should be used for the parameter of crate::objects::TooltipCallbacks::title

1. first create a function

#[wasm_bindgen]
pub fn tooltip_date_title_callback(context: JsValue) -> JsValue {
    match ChartJsPoint::<NaiveDate, Dollars>::parse_array(context) {
        Ok(vals) if !vals.is_empty() => JsValue::from_str(vals[0].label.split(",").next().unwrap_or_default()),
        Ok(_) => {
            console_dbg!("Empty array");
            JsValue::from_str("")
        }
        Err(e) => {
            console_dbg!("Error parsing", e);
            JsValue::from_str("")
        }
    }
}

2. then use with the builder:

ChartOptions::new()
.plugins(
    ChartPlugins::new()
        .tooltip(
            TooltipPlugin::new().callbacks(
                TooltipCallbacks::new()
                    .title(
                        FnWithArgs::<1>::new()
                            .run_rust_fn(tooltip_date_title_callback),
                    )
            ),
        ),
)

Trait Implementations

impl<T: Debug, U: Debug> Debug for ChartJsPoint<T, U>

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.