Refactor error list handling: improve link click behavior and enhance… (

#7330)

packages/components/src/components/form/shadow.tsx

@@ -1,12 +1,12 @@
 import type { JSX } from '@stencil/core';
+import { Component, h, Host, Method, Prop, State, Watch } from '@stencil/core';
 import { validateErrorList, watchBoolean, watchString } from '../../schema';
-import { Component, h, Host, Prop, State, Watch, Method } from '@stencil/core';
 
 import { translate } from '../../i18n';
 
-import type { ErrorListPropType, FormAPI, FormStates, KoliBriFormCallbacks, Stringified } from '../../schema';
 import { KolLinkWcTag } from '../../core/component-names';
 import KolAlertFc from '../../functional-components/Alert';
+import type { ErrorListPropType, FormAPI, FormStates, KoliBriFormCallbacks, Stringified } from '../../schema';
 
 /**
  * @slot - Inhalt der Form.
@@ -19,7 +19,8 @@ import KolAlertFc from '../../functional-components/Alert';
 	shadow: true,
 })
 export class KolForm implements FormAPI {
-	errorListElement?: HTMLElement;
+	errorListBlock?: HTMLElement;
+	errorListFirstLink?: HTMLElement;
 
 	/* Hint: This method may not be used at all while events are handled in form/controller#propagateSubmitEventToForm */
 	private readonly onSubmit = (event: Event) => {
@@ -38,29 +39,19 @@ export class KolForm implements FormAPI {
 		}
 	};
 
-	private readonly handleLinkClick = (event: Event) => {
-		const href = (event.target as HTMLAnchorElement | undefined)?.href;
-		if (href) {
-			const hrefUrl = new URL(href);
-
-			const targetElement = document.querySelector<HTMLElement>(hrefUrl.hash);
-			if (targetElement && typeof targetElement.focus === 'function') {
-				targetElement.scrollIntoView({ behavior: 'smooth' });
-				targetElement.focus();
-			}
+	private readonly handleLinkClick = (selector: string) => {
+		const targetElement = document.querySelector<HTMLElement>(selector);
+		if (targetElement && typeof targetElement.focus === 'function') {
+			targetElement.scrollIntoView({ behavior: 'smooth' });
+			targetElement.focus();
 		}
 	};
 
 	private renderErrorList(errorList?: ErrorListPropType[]): JSX.Element {
 		return (
 			<KolAlertFc
 				ref={(el) => {
-					setTimeout(() => {
-						if (el && typeof el.focus === 'function') {
-							el.scrollIntoView({ behavior: 'smooth' });
-							el.focus();
-						}
-					}, 250);
+					this.errorListBlock = el;
 				}}
 				type="error"
 				variant="card"
@@ -71,11 +62,14 @@ export class KolForm implements FormAPI {
 						{errorList?.map((error, index) => (
 							<li key={index}>
 								<KolLinkWcTag
-									_href={error.selector}
+									_href=""
 									_label={error.message}
-									_on={{ onClick: this.handleLinkClick }}
+									_on={{ onClick: typeof error.selector === 'string' ? () => this.handleLinkClick(String(error.selector)) : error.selector }}
 									ref={(el) => {
-										if (index === 0) this.errorListElement = el;
+										if (index === 0) {
+											this.errorListFirstLink = el;
+											this.scrollToErrorList();
+										}
 									}}
 								/>
 							</li>
@@ -114,11 +108,19 @@ export class KolForm implements FormAPI {
 		);
 	}
 
+	private scrollToErrorList(): void {
+		this.errorListBlock?.scrollIntoView({
+			behavior: 'smooth',
+			block: 'start',
+		});
+		setTimeout(() => {
+			this.errorListFirstLink?.querySelector('a')?.focus();
+		}, 250);
+	}
+
 	@Method()
 	async focusErrorList(): Promise<void> {
-		if (this._errorList && this._errorList.length > 0) {
-			this.errorListElement?.focus();
-		}
+		this.scrollToErrorList();
 		return Promise.resolve();
 	}
 

packages/components/src/schema/props/error-list.ts

@@ -1,10 +1,11 @@
 import type { Generic } from 'adopted-style-sheets';
+import { EventCallback } from '../types';
 import { watchValidator } from '../utils';
 
 /* types */
 export type ErrorListPropType = {
 	message: string;
-	selector: string;
+	selector: string | EventCallback<Event>;
 };
 
 export type PropErrorList = {
@@ -13,5 +14,11 @@ export type PropErrorList = {
 
 /* validator */
 export const validateErrorList = (component: Generic.Element.Component, value?: ErrorListPropType[]): void => {
-	watchValidator(component, 'errorList', (value): boolean => typeof value === 'object', new Set(['Object']), value);
+	watchValidator(
+		component,
+		'errorList',
+		(value): boolean => Array.isArray(value) && value.find((v) => !(typeof v === 'string' || typeof v === 'function')) === undefined,
+		new Set(['string', 'function']),
+		value,
+	);
 };

packages/samples/react/src/components/form/error-list.tsx

@@ -1,28 +1,42 @@
+import { KolButton, KolForm, KolInputText } from '@public-ui/react';
 import type { FC } from 'react';
-import React from 'react';
+import React, { useRef } from 'react';
 import { SampleDescription } from '../SampleDescription';
-import { KolForm, KolInputText } from '@public-ui/react';
 
-export const FormErrorList: FC = () => (
-	<>
-		<SampleDescription>
-			<p>This sample shows a form with error messages.</p>
-		</SampleDescription>
+export const FormErrorList: FC = () => {
+	const formRef = useRef<HTMLKolFormElement>();
+	return (
+		<>
+			<SampleDescription>
+				<p>This sample shows a form with error messages.</p>
+			</SampleDescription>
 
-		<KolForm
-			className="w-full"
-			_errorList={[
-				{
-					message: 'Error in Input 2',
-					selector: '#input2',
-				},
-			]}
-		>
-			<div className="grid gap-2">
-				<KolInputText id="input1" _label="Input 1" />
-				<KolInputText id="input2" _label="Input 2" _touched _msg={{ _description: 'Input error', _type: 'error' }} />
-				<KolInputText id="input3" _label="Input 3" />
-			</div>
-		</KolForm>
-	</>
-);
+			<KolForm
+				className="w-full"
+				ref={formRef}
+				_errorList={[
+					{
+						message: 'Error in Input 2',
+						selector: '#input2',
+					},
+				]}
+			>
+				<div className="grid gap-2">
+					<KolInputText id="input1" _label="Input 1" />
+					<KolInputText id="input2" _label="Input 2" _touched _msg={{ _description: 'Input error', _type: 'error' }} />
+					<KolInputText id="input3" _label="Input 3" />
+					<div>
+						<KolButton
+							_label="ScrollTo"
+							_on={{
+								onClick: () => {
+									formRef.current?.focusErrorList();
+								},
+							}}
+						/>
+					</div>
+				</div>
+			</KolForm>
+		</>
+	);
+};