feat: implement validation for select component

src/components/checkbox.rs

@@ -2,7 +2,7 @@ use crate::common::ValueType;
 use crate::components::utils::create_unique_id;
 use leptos::prelude::*;
 use std::collections::HashMap;
-use crate::components::{FormValidationRegistry, InputState, ValidationState};
+use crate::components::{use_validation_context, FormValidationRegistry, InputState, ValidationState};
 
 /// # Checkbox Component
 /// This component should only be used from within a [`CheckboxList`] component.
@@ -160,7 +160,7 @@ pub fn CheckboxList(
     //#endregion
     //#region Form Validation
 
-    let validation_context = use_context::<FormValidationRegistry>()
+    let validation_context = use_validation_context()
         .expect("FormValidationRegistry was not found");
 
     let error = Signal::derive(move || {

src/components/select.rs

@@ -3,6 +3,16 @@ use leptos::ev::{Event, Targeted};
 use leptos::prelude::*;
 use leptos::web_sys::HtmlSelectElement;
 use std::collections::HashMap;
+use leptos::logging::{log, warn};
+use crate::components::{use_validation_context, InputState, ValidationState};
+
+fn validate(required: bool, value: String, default_value: String) -> ValidationState {
+    if required && (value.is_empty() || value == default_value) {
+        ValidationState::Invalid("This input is required.".to_string())
+    } else {
+        ValidationState::Valid
+    }
+}
 
 /// A custom-styled select input.
 ///
@@ -11,48 +21,110 @@ use std::collections::HashMap;
 #[component]
 pub fn Select(
     #[prop()] value_list: Vec<String>,
+    #[prop(optional, into)] default_value: Signal<String>,
     #[prop(optional)] value: RwSignal<String>,
-    #[prop(into)] data_member: String,
+    #[prop(into)] data_member: Signal<String>,
     #[prop()] data_map: RwSignal<HashMap<String, ValueType>>,
     #[prop(optional, into)] label: String,
     #[prop(optional, into)] disabled: Signal<bool>,
+    #[prop(optional, into)] required: Signal<bool>
 ) -> impl IntoView {
-    let on_change = {
-        let data_member = data_member.clone();
-        move |e: Targeted<Event, HtmlSelectElement>| {
-            let target_value = e.target().value();
-            data_map.update(|map| {
-                if let Some(val) = map.get_mut(&data_member) {
-                    *val = ValueType::String(Some(target_value));
-                } else {
-                    map.insert(data_member.clone(), ValueType::String(Some(target_value)));
-                }
-            });
+    //#region Value Logic
+
+    let default_raw_value = if default_value.get_untracked().is_empty() {
+        data_map.get_untracked()
+            .get(&data_member.get_untracked())
+            .cloned()
+            .unwrap_or_default()
+            .as_string().unwrap_or_default().unwrap_or_default()
+    } else {
+        let default = default_value.get_untracked();
+        if !value_list.contains(&default) {
+            warn!("The default value {} is not in the list of options. This may cause validation issues.", default);
         }
+
+        default
     };
 
+    let raw_value = RwSignal::new(default_raw_value);
+
+    Effect::new(move || {
+        data_map.update(|map| {
+            map.insert(data_member.get(), ValueType::String(Some(raw_value.get())));
+        });
+    });
+
+    //#endregion
+    //#region Validation Logic
+
+    let error = RwSignal::new(
+        validate(required.get_untracked(), raw_value.get_untracked(), default_value.get_untracked())
+    );
+    warn!("Current error state: {:?}", error.get_untracked());
+    let dirty = RwSignal::new(false);
+    let show_errors = Signal::derive(move || dirty.get() && matches!(error.get(), ValidationState::Invalid(_)));
+
+    let input_state = InputState::new(data_member.get(), error.clone(), dirty.clone());
+
+    let validation_context = use_validation_context()
+        .expect("Could not find FormValidationRegistry context");
+
+    validation_context.validators.update(|list| list.push(RwSignal::new(input_state)));
+
+    //#endregion
+    //#region Event Logic
+
+    let on_change = move |e: Targeted<Event, HtmlSelectElement>| {
+        let value = e.target().value();
+        log!("Found value {}", value);
+        raw_value.set(value.clone());
+        error.set(validate(required.get(), raw_value.get(), default_value.get()));
+        dirty.set(true);
+        data_map.update(|map| {
+            if let Some(val) = map.get_mut(&data_member.get()) {
+                *val = ValueType::String(Some(value.clone()));
+            } else {
+                map.insert(data_member.get(), ValueType::String(Some(value)));
+            }
+        });
+    };
+
+    //#endregion
+
     view! {
-        <div class="flex flex-1">
-            <label class="flex flex-col flex-1">
-                <span class="ml-1.5 mb-0 font-bold">{label}</span>
-                <select
-                    class="relative flex-1 border-2 m-1.5 mt-0 p-1.5 rounded-md
-                        transition-border duration-150
-                        border-red-700 bg-transparent
-                        disabled:border-gray-600 disabled:pointer-events-none disabled:bg-gray-600/33"
-                    on:change:target=on_change
-                    disabled = disabled >
-                    // This closure handles the display of the options.
+        <div class="flex flex-col flex-1">
+            <div class="flex flex-1">
+                <label class="flex flex-col flex-1">
+                    <span class="ml-1.5 mb-0 font-bold">{label}</span>
+                    <select
+                        class="relative flex-1 border-2 m-1.5 mt-0 p-1.5 rounded-md
+                            transition-border duration-150
+                            border-red-700 bg-transparent
+                            disabled:border-gray-600 disabled:pointer-events-none disabled:bg-gray-600/33"
+                        on:change:target=on_change
+                        disabled = disabled >
+                        // This closure handles the display of the options.
+                        {move || {
+                            value_list.iter().map(
+                                move |value| {
+                                    let display = value.to_owned();
+                                    view! { <option value={display}>{display.clone()}</option> }
+                                }
+                            ).collect::<Vec<_>>()
+                        }}
+                    </select>
+                </label>
+            </div>
+            <Show when=move || show_errors.get()>
+                <div class="text-red-600 text-sm mr-1.5 ml-1.5">
                     {move || {
-                        value_list.iter().map(
-                            move |value| {
-                                let display = value.to_owned();
-                                view! { <option value={display}>{display.clone()}</option> }
-                            }
-                        ).collect::<Vec<_>>()
+                        match error.get() {
+                            ValidationState::Invalid(msg) => msg,
+                            _ => "There is no error - should not see this message.".to_string()
+                        }
                     }}
-                </select>
-            </label>
+                </div>
+            </Show>
         </div>
     }
 }

src/components/text_field.rs

@@ -3,7 +3,7 @@ use leptos::prelude::*;
 use std::collections::HashMap;
 use leptos::html::Input;
 use leptos::logging::log;
-use crate::components::InputState;
+use crate::components::{use_validation_context, InputState};
 use crate::components::validated_form::{FormValidationRegistry, ValidationState};
 
 /// Determines the available types of text fields.
@@ -68,7 +68,7 @@ pub fn OutlinedTextField(
     let input_ref = NodeRef::<Input>::new();
 
     // Register this input's validation signal.
-    let validator_context = use_context::<FormValidationRegistry>()
+    let validator_context = use_validation_context()
         .expect("FormValidSignal was not found");
 
     let raw_value = RwSignal::new(data_map.get_untracked()

src/components/validated_form.rs

@@ -56,6 +56,11 @@ pub struct FormValidationRegistry {
     pub validators: RwSignal<ValidatorList>
 }
 
+/// Gets the [`FormValidationRegistry`] context if it exists.
+pub fn use_validation_context() -> Option<FormValidationRegistry> {
+    use_context::<FormValidationRegistry>()
+}
+
 /// # Validated Form Component
 ///
 /// A simple HTML `<form>` wrapper that executes validation logic using a [`FormValidationRegistry`].

src/pages/home_page.rs

@@ -319,9 +319,11 @@ pub fn HomePage() -> impl IntoView {
                                                             .into_iter()
                                                             .map(|s| s.to_owned())
                                                             .collect()
+                                                        default_value="Male"
                                                         disabled=elements_disabled
                                                         data_member="gender"
                                                         data_map=form_data
+                                                        required=true
                                                     />
                                                 </Row>
                                                 <Row>