nova_forms/components/
checkbox.rs

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use crate::{use_translation, Datatype, NovaFormContext, QueryString};
use leptos::*;

/// A component that renders a checkbox.
#[component]
pub fn Checkbox<T>(
    /// The label of the input field.
    #[prop(into)] label: TextProp,
    /// The query string that binds the input field to the form data.
    #[prop(into)] bind: QueryString,
    /// A debug value that is used to autofill the input field in debug mode.
    #[prop(optional, into)] debug_value: Option<T>,
    /// The initial value of the input field.
    #[prop(optional, into)] value: MaybeProp<T>,
    /// A write signal that is updated with the parsed value of the input field.
    #[prop(optional, into)] sync: Option<WriteSignal<T>>,
    /// Set a custom error message for the input field.
    #[prop(optional, into)] error: MaybeProp<TextProp>,
) -> impl IntoView
where
    T: Datatype<Inner = bool>
{    
    let (qs, form_value) = bind.form_value::<T>();

    let (input_value, set_input_value) = create_signal(None);

    let raw_value = Signal::derive(move || {
        if cfg!(debug_assertions) {
            input_value.get()
                .unwrap_or_else(|| value.get()
                    .or_else(|| form_value.clone().ok())
                    .or_else(|| debug_value.clone())
                    .unwrap_or_else(|| T::default_debug_value())
                    .into())
        } else {
            input_value.get()
                .unwrap_or_else(|| value.get()
                    .or_else(|| form_value.clone().ok())
                    .map(|v| v.into())
                    .unwrap_or_default())
        }
    });

    let nova_form_context = expect_context::<NovaFormContext>();
    let validation_trigger = nova_form_context.register_input(qs.clone(), label.clone());

    let show_error = Signal::derive(move || {
        input_value.get().is_some() || validation_trigger.get()
    });

    let parsed_value = Signal::derive(move || T::validate(raw_value.get()));

    let qs_clone = qs.clone();
    on_cleanup(move || {
        nova_form_context.deregister_input(qs_clone);
    });

    let qs_clone = qs.clone();
    create_effect(move |_| {
        let qs = qs_clone.clone();
        match parsed_value.get() {
            Err(_err) => nova_form_context.set_error(&qs, true),
            Ok(value) => if let Some(sync) = sync {
                sync.set(value);
            }
        }
    });

    let input_elem = html::input()
        .attr("type", "checkbox")
        .attr("id", qs.to_string())
        .attr("name", qs.to_string())
        .attr("checked", move || raw_value.get())
        .attr("value", move || raw_value.get().to_string())
        .on(ev::input, move |ev| {
            set_input_value.set(Some(event_target_checked(&ev)));
        });


    view! {
        <div
            class="field checkbox"
            class:error=move || parsed_value.get().is_err() && show_error.get()
            class:ok=move || parsed_value.get().is_ok() && show_error.get()
        >
            <label for=qs.to_string()>
                {input_elem}
                <span class="custom-checkbox"></span>
                <span class="custom-checkbox-label">{label}</span>
            </label>
            {move || {
                if let Some(error) = error.get() {
                    view! { <span class="error-message">{error}</span> }
                        .into_view()
                } else
                if let (Err(err), true) = (
                    parsed_value.get(),
                    show_error.get(),
                ) {
                    view! { <span class="error-message">{use_translation(err)}</span> }
                        .into_view()
                } else {
                    View::default()
                }
            }}
        </div>
    }
}