phone input: make name optional, custom class support, fix formatting

src/lib/PhoneInput.svelte

@@ -1,30 +1,37 @@
 <script lang="ts">
 	import Label from './Label.svelte';
 	import { Country, type ICountry } from 'country-state-city';
-	import ExpandableCombobox, { type ComboboxItem } from './Combobox.svelte';
+	import Combobox, { type ComboboxItem } from './Combobox.svelte';
 	import StyledRawInput from './StyledRawInput.svelte';
 	import { AsYouType, type PhoneNumber, type CountryCode } from 'libphonenumber-js';
+	import { generateIdentifier } from './util.js';
+	import type { ClassValue } from 'svelte/elements';
 
-	let {
-		name,
-		value = $bindable<PhoneNumber | undefined>(undefined),
-		country = $bindable<ICountry | undefined>(), // consider making this private, it should only be used internally
-		defaultISO,
-		required = false,
-		label,
-		placeholder = 'Phone number',
-		invalidMessage
-	}: {
-		name: string;
+	interface Props {
+		name?: string;
 		value?: PhoneNumber;
-		country?: ICountry;
 		defaultISO?: string;
 		required?: boolean;
 		label?: string;
 		placeholder?: string;
 		invalidMessage?: string;
-	} = $props();
+		class?: ClassValue | null | undefined;
+	}
 
+	let {
+		name,
+		value = $bindable<PhoneNumber | undefined>(undefined),
+		defaultISO,
+		required = false,
+		label,
+		placeholder = 'Phone number',
+		invalidMessage = 'Valid phone number is required',
+		class: classValue
+	}: Props = $props();
+
+	const id = $derived(generateIdentifier('phone-input', name));
+	let lastRawValue = $state('');
+	let country = $state<ICountry | undefined>();
 	let selectedCountryItem = $state<ComboboxItem | undefined>();
 	let countriesOpen = $state<boolean>(false);
 	let countriesValid = $state<boolean>(true);
@@ -69,9 +76,7 @@
 		if (locationData.status !== 'fail') {
 			const { countryCode } = locationData;
 			country = countryCode;
-			console.log('updating country code according to IP', country);
 		}
-
 		setCountryByISO(country);
 	};
 
@@ -81,11 +86,13 @@
 	}
 
 	// if country is still blank (probably invalid defaultISO), set it to the first country
-	if (!country) {
+	if (!(() => country)()) {
 		country = countries[0];
 
 		if (defaultISO)
-			console.warn(`PhoneInput: Invalid defaultISO "${defaultISO}", defaulting to ${country.name}`);
+			console.warn(
+				`PhoneInput: Invalid defaultISO "${defaultISO}", defaulting to ${(() => country)().name}`
+			);
 	}
 
 	selectedCountryItem = options.find((item) => item.value === country?.isoCode);
@@ -102,21 +109,20 @@
 	{/if}
 {/snippet}
 
-<div>
+<div class={classValue}>
 	{#if label}
-		<Label for={name}>{label}</Label>
+		<Label for={id}>{label}</Label>
 	{/if}
 
 	<!-- Hidden input stores international E.164 formatted number -->
-	<input type="hidden" {name} value={value?.number ?? ''} />
+	<input type="hidden" {name} {id} value={value?.number ?? ''} />
 
 	<div class="flex gap-2">
 		<div
 			class={['transition-width', countriesOpen && 'w-full!']}
 			style="width: {phonecode.length * 1.5 + 12.5}ch;"
 		>
-			<ExpandableCombobox
-				name="{name}_country"
+			<Combobox
 				{options}
 				bind:value={selectedCountryItem}
 				bind:open={countriesOpen}
@@ -134,7 +140,6 @@
 			<StyledRawInput
 				type="tel"
 				{placeholder}
-				name="{name}_number"
 				validate={{
 					required: required,
 					func: () => !required || (value !== undefined && value.isValid())
@@ -153,6 +158,12 @@
 
 					e.preventDefault();
 				}}
+				onbeforeinput={(event: Event) => {
+					const target = event.target as HTMLInputElement;
+					if (target) {
+						lastRawValue = target.value;
+					}
+				}}
 				oninput={(event: Event) => {
 					const e = event as InputEvent;
 					if (!e.target) return;
@@ -161,15 +172,20 @@
 					const formatter = new AsYouType(formatterCountryCode);
 					const formatted = formatter.input(input.value);
 
-					if (formatted.length >= input.value.length) input.value = formatted;
+					if (input.value.length >= lastRawValue.length) {
+						setTimeout(() => {
+							input.value = formatted;
+						}, 1);
+					}
 					value = formatter.getNumber();
-					console.log('updated value', value, value?.isValid());
 
 					if (formatter.isValid() && formatter.isInternational() && value) {
 						const country = formatter.getCountry();
 						if (country) {
 							setCountryByISO(country);
-							input.value = value.formatNational();
+							setTimeout(() => {
+								if (value) input.value = value.formatNational();
+							}, 1);
 						}
 					}
 				}}
@@ -178,8 +194,8 @@
 	</div>
 
 	<div class={['opacity-0 transition-opacity', (!countriesValid || !numberValid) && 'opacity-100']}>
-		<Label for={name} error>
-			{invalidMessage !== undefined && invalidMessage != '' ? invalidMessage : 'Field is required'}
+		<Label for={id} error>
+			{invalidMessage}
 		</Label>
 	</div>
 </div>