From b88760d57809d49163033d24d04daf61a7bf0a09 Mon Sep 17 00:00:00 2001 From: Thijs Louisse Date: Wed, 6 Jan 2021 00:44:30 +0100 Subject: [PATCH] feat(form-core): add details.isTriggeredByUser to model-value-changed --- packages/form-core/src/FormControlMixin.js | 29 ++- packages/form-core/src/FormatMixin.js | 6 +- .../src/choice-group/ChoiceInputMixin.js | 7 + .../test-suites/FormatMixin.suite.js | 17 +- .../choice-group/ChoiceInputMixin.suite.js | 15 ++ .../form-core/test/FormControlMixin.test.js | 39 ++++ .../types/FormControlMixinTypes.d.ts | 49 +++-- .../docs/17-validation-examples.md | 6 +- .../test/model-value-consistency.test.js | 177 ++++++++++++++++++ packages/listbox/src/LionOption.js | 2 + packages/listbox/src/ListboxMixin.js | 9 +- packages/listbox/test/lion-option.test.js | 32 ++++ 12 files changed, 357 insertions(+), 31 deletions(-) diff --git a/packages/form-core/src/FormControlMixin.js b/packages/form-core/src/FormControlMixin.js index 3a2609caa..0f7820599 100644 --- a/packages/form-core/src/FormControlMixin.js +++ b/packages/form-core/src/FormControlMixin.js @@ -4,6 +4,16 @@ import { FormRegisteringMixin } from './registration/FormRegisteringMixin.js'; import { getAriaElementsInRightDomOrder } from './utils/getAriaElementsInRightDomOrder.js'; import { Unparseable } from './validate/Unparseable.js'; +/** + * @typedef {import('@lion/core').TemplateResult} TemplateResult + * @typedef {import('@lion/core').CSSResult} CSSResult + * @typedef {import('@lion/core').nothing} nothing + * @typedef {import('@lion/core/types/SlotMixinTypes').SlotsMap} SlotsMap + * @typedef {import('../types/FormControlMixinTypes.js').FormControlHost} FormControlHost + * @typedef {import('../types/FormControlMixinTypes.js').FormControlMixin} FormControlMixin + * @typedef {import('../types/FormControlMixinTypes.js').ModelValueEventDetails} ModelValueEventDetails + */ + /** * Generates random unique identifier (for dom elements) * @param {string} prefix @@ -18,11 +28,6 @@ function uuid(prefix) { * This Mixin is a shared fundament for all form components, it's applied on: * - LionField (which is extended to LionInput, LionTextarea, LionSelect etc. etc.) * - LionFieldset (which is extended to LionRadioGroup, LionCheckboxGroup, LionForm) - * @typedef {import('@lion/core').TemplateResult} TemplateResult - * @typedef {import('@lion/core').CSSResult} CSSResult - * @typedef {import('@lion/core').nothing} nothing - * @typedef {import('@lion/core/types/SlotMixinTypes').SlotsMap} SlotsMap - * @typedef {import('../types/FormControlMixinTypes.js').FormControlMixin} FormControlMixin * @param {import('@open-wc/dedupe-mixin').Constructor} superclass * @type {FormControlMixin} */ @@ -750,7 +755,11 @@ const FormControlMixinImplementation = superclass => this.dispatchEvent( new CustomEvent('model-value-changed', { bubbles: true, - detail: { formPath: [this], initialize: true }, + detail: /** @type {ModelValueEventDetails} */ ({ + formPath: [this], + initialize: true, + isTriggeredByUser: false, + }), }), ); } @@ -822,7 +831,13 @@ const FormControlMixinImplementation = superclass => // // Since for a11y everything needs to be in lightdom, we don't add 'composed:true' this.dispatchEvent( - new CustomEvent('model-value-changed', { bubbles: true, detail: { formPath } }), + new CustomEvent('model-value-changed', { + bubbles: true, + detail: /** @type {ModelValueEventDetails} */ ({ + formPath, + isTriggeredByUser: Boolean(ev.detail?.isTriggeredByUser), + }), + }), ); } diff --git a/packages/form-core/src/FormatMixin.js b/packages/form-core/src/FormatMixin.js index 136132dc8..8ec33e3c4 100644 --- a/packages/form-core/src/FormatMixin.js +++ b/packages/form-core/src/FormatMixin.js @@ -8,6 +8,7 @@ import { ValidateMixin } from './validate/ValidateMixin.js'; /** * @typedef {import('../types/FormatMixinTypes').FormatMixin} FormatMixin * @typedef {import('@lion/localize/types/LocalizeMixinTypes').FormatNumberOptions} FormatOptions + * @typedef {import('../types/FormControlMixinTypes.js').ModelValueEventDetails} ModelValueEventDetails */ // For a future breaking release: @@ -316,7 +317,10 @@ const FormatMixinImplementation = superclass => this.dispatchEvent( new CustomEvent('model-value-changed', { bubbles: true, - detail: { formPath: [this] }, + detail: /** @type { ModelValueEventDetails } */ ({ + formPath: [this], + isTriggeredByUser: Boolean(this.__isHandlingUserInput), + }), }), ); } diff --git a/packages/form-core/src/choice-group/ChoiceInputMixin.js b/packages/form-core/src/choice-group/ChoiceInputMixin.js index 58cba4e73..dac659e9c 100644 --- a/packages/form-core/src/choice-group/ChoiceInputMixin.js +++ b/packages/form-core/src/choice-group/ChoiceInputMixin.js @@ -175,6 +175,7 @@ const ChoiceInputMixinImplementation = superclass => + ${this._afterTemplate()} `; } @@ -182,6 +183,10 @@ const ChoiceInputMixinImplementation = superclass => return nothing; } + _afterTemplate() { + return nothing; + } + connectedCallback() { super.connectedCallback(); this.addEventListener('user-input-changed', this.__toggleChecked); @@ -196,7 +201,9 @@ const ChoiceInputMixinImplementation = superclass => if (this.disabled) { return; } + this.__isHandlingUserInput = true; this.checked = !this.checked; + this.__isHandlingUserInput = false; } /** diff --git a/packages/form-core/test-suites/FormatMixin.suite.js b/packages/form-core/test-suites/FormatMixin.suite.js index 82c488dc6..6180c2d7a 100644 --- a/packages/form-core/test-suites/FormatMixin.suite.js +++ b/packages/form-core/test-suites/FormatMixin.suite.js @@ -123,18 +123,23 @@ export function runFormatMixinSuite(customConfig) { `); }); - it('fires `model-value-changed` for every change on the input', async () => { + it('fires `model-value-changed` for every input triggered by user', async () => { const formatEl = /** @type {FormatClass} */ (await fixture( html`<${elem}>`, )); let counter = 0; - formatEl.addEventListener('model-value-changed', () => { + let isTriggeredByUser = false; + formatEl.addEventListener('model-value-changed', ( + /** @param {CustomEvent} event */ event, + ) => { counter += 1; + isTriggeredByUser = /** @type {CustomEvent} */ (event).detail.isTriggeredByUser; }); mimicUserInput(formatEl, generateValueBasedOnType()); expect(counter).to.equal(1); + expect(isTriggeredByUser).to.be.true; // Counter offset +1 for Date because parseDate created a new Date object // when the user changes the value. @@ -150,17 +155,21 @@ export function runFormatMixinSuite(customConfig) { expect(counter).to.equal(2 + counterOffset); }); - it('fires `model-value-changed` for every modelValue change', async () => { + it('fires `model-value-changed` for every programmatic modelValue change', async () => { const el = /** @type {FormatClass} */ (await fixture( html`<${elem}>`, )); let counter = 0; - el.addEventListener('model-value-changed', () => { + let isTriggeredByUser = false; + + el.addEventListener('model-value-changed', event => { counter += 1; + isTriggeredByUser = /** @type {CustomEvent} */ (event).detail.isTriggeredByUser; }); el.modelValue = 'one'; expect(counter).to.equal(1); + expect(isTriggeredByUser).to.be.false; // no change means no event el.modelValue = 'one'; diff --git a/packages/form-core/test-suites/choice-group/ChoiceInputMixin.suite.js b/packages/form-core/test-suites/choice-group/ChoiceInputMixin.suite.js index 1b96336ee..b03fe21cb 100644 --- a/packages/form-core/test-suites/choice-group/ChoiceInputMixin.suite.js +++ b/packages/form-core/test-suites/choice-group/ChoiceInputMixin.suite.js @@ -95,6 +95,21 @@ export function runChoiceInputMixinSuite({ tagString } = {}) { expect(counter).to.equal(1); }); + it('adds "isTriggerByUser" flag on model-value-changed', async () => { + let isTriggeredByUser; + const el = /** @type {ChoiceInput} */ (await fixture(html` + <${tag} + @model-value-changed="${(/** @type {CustomEvent} */ event) => { + isTriggeredByUser = event.detail.isTriggeredByUser; + }}" + > + + + `)); + el._inputNode.dispatchEvent(new CustomEvent('change', { bubbles: true })); + expect(isTriggeredByUser).to.be.true; + }); + it('can be required', async () => { const el = /** @type {ChoiceInput} */ (await fixture(html` <${tag} .choiceValue=${'foo'} .validators=${[new Required()]}> diff --git a/packages/form-core/test/FormControlMixin.test.js b/packages/form-core/test/FormControlMixin.test.js index b2c36ae8e..36c7a3dbd 100644 --- a/packages/form-core/test/FormControlMixin.test.js +++ b/packages/form-core/test/FormControlMixin.test.js @@ -238,14 +238,19 @@ describe('FormControlMixin', () => { const fieldsetEv = fieldsetSpy.firstCall.args[0]; expect(fieldsetEv.target).to.equal(fieldsetEl); expect(fieldsetEv.detail.formPath).to.eql([fieldsetEl]); + expect(fieldsetEv.detail.initialize).to.be.true; expect(formSpy.callCount).to.equal(1); const formEv = formSpy.firstCall.args[0]; expect(formEv.target).to.equal(formEl); expect(formEv.detail.formPath).to.eql([formEl]); + expect(formEv.detail.initialize).to.be.true; }); }); + /** + * After initialization means: events triggered programmatically or by user actions + */ describe('After initialization', () => { it('redispatches one event from host and keeps formPath history', async () => { const formSpy = sinon.spy(); @@ -310,11 +315,45 @@ describe('FormControlMixin', () => { const choiceGroupEv = choiceGroupSpy.firstCall.args[0]; expect(choiceGroupEv.target).to.equal(choiceGroupEl); expect(choiceGroupEv.detail.formPath).to.eql([choiceGroupEl]); + expect(choiceGroupEv.detail.isTriggeredByUser).to.be.false; expect(formSpy.callCount).to.equal(1); const formEv = formSpy.firstCall.args[0]; expect(formEv.target).to.equal(formEl); expect(formEv.detail.formPath).to.eql([choiceGroupEl, formEl]); + expect(formEv.detail.isTriggeredByUser).to.be.false; + }); + + it('sets "isTriggeredByUser" event detail when event triggered by user', async () => { + const formSpy = sinon.spy(); + const fieldsetSpy = sinon.spy(); + const fieldSpy = sinon.spy(); + const formEl = await fixture(html` + <${groupTag} name="form"> + <${groupTag} name="fieldset"> + <${tag} name="field"> + + + `); + const fieldEl = formEl.querySelector('[name=field]'); + const fieldsetEl = formEl.querySelector('[name=fieldset]'); + + formEl.addEventListener('model-value-changed', formSpy); + fieldsetEl?.addEventListener('model-value-changed', fieldsetSpy); + fieldEl?.addEventListener('model-value-changed', fieldSpy); + + fieldEl?.dispatchEvent( + new CustomEvent('model-value-changed', { + bubbles: true, + detail: { isTriggeredByUser: true }, + }), + ); + + const fieldsetEv = fieldsetSpy.firstCall.args[0]; + expect(fieldsetEv.detail.isTriggeredByUser).to.be.true; + + const formEv = formSpy.firstCall.args[0]; + expect(formEv.detail.isTriggeredByUser).to.be.true; }); }); }); diff --git a/packages/form-core/types/FormControlMixinTypes.d.ts b/packages/form-core/types/FormControlMixinTypes.d.ts index 4a22aa04f..581186cdc 100644 --- a/packages/form-core/types/FormControlMixinTypes.d.ts +++ b/packages/form-core/types/FormControlMixinTypes.d.ts @@ -6,6 +6,29 @@ import { DisabledHost } from '@lion/core/types/DisabledMixinTypes'; import { LionValidationFeedback } from '../src/validate/LionValidationFeedback'; import { FormRegisteringHost } from './registration/FormRegisteringMixinTypes'; +export type ModelValueEventDetails { + /** + * A list that represents the path of FormControls the model-value-changed event + * 'traveled through'. + * (every FormControl stops propagation of its child and sends a new event, hereby adding + * itself to the beginning of formPath) + */ + formPath: HTMLElement[]; + /** + * Whether the model-value-changed event is triggered via user interaction. This information + * can be helpful for both Application Developers and Subclassers. + * This concept is related to the native isTrusted property: + * https://developer.mozilla.org/en-US/docs/Web/API/Event/isTrusted + */ + isTriggeredByUser: boolean; + /** + * Whether it is the first event sent on initialization of the form (other + * model-value-changed events are triggered imperatively or via user input (in the latter + * case `isTriggeredByUser` is true)) + */ + initialize?: boolean; +} + declare interface HTMLElementWithValue extends HTMLElement { value: string; } @@ -40,12 +63,12 @@ export declare class FormControlHost { * controls until they are enabled. * (From: https://developer.mozilla.org/en-US/docs/Web/HTML/Element/input#attr-readonly) */ - readOnly: boolean; + public readOnly: boolean; /** - * The name the element will be registered on to the .formElements collection + * The name the element will be registered with to the .formElements collection * of the parent. */ - name: string; + public name: string; /** * The model value is the result of the parser function(when available). * It should be considered as the internal value used for validation and reasoning/logic. @@ -58,25 +81,25 @@ export declare class FormControlHost { * - For a number input: a formatted String '1.234,56' will be converted to a Number: * 1234.56 */ - modelValue: unknown; + public modelValue: unknown; /** * The label text for the input node. * When no light dom defined via [slot=label], this value will be used */ - get label(): string; - set label(arg: string); + public get label(): string; + public set label(arg: string); __label: string | undefined; /** * The helpt text for the input node. * When no light dom defined via [slot=help-text], this value will be used */ - get helpText(): string; - set helpText(arg: string); + public get helpText(): string; + public set helpText(arg: string); __helpText: string | undefined; - set fieldName(arg: string); - get fieldName(): string; + public set fieldName(arg: string); + public get fieldName(): string; __fieldName: string | undefined; - get slots(): SlotsMap; + public get slots(): SlotsMap; get _inputNode(): HTMLElementWithValue; get _labelNode(): HTMLElement; get _helpTextNode(): HTMLElement; @@ -123,7 +146,7 @@ export declare class FormControlHost { __reflectAriaAttr(attrName: string, nodes: HTMLElement[], reorder: boolean | undefined): void; _isEmpty(modelValue?: unknown): boolean; _getAriaDescriptionElements(): HTMLElement[]; - addToAriaLabelledBy( + public addToAriaLabelledBy( element: HTMLElement, customConfig?: { idPrefix?: string | undefined; @@ -131,7 +154,7 @@ export declare class FormControlHost { }, ): void; __reorderAriaLabelledNodes: boolean | undefined; - addToAriaDescribedBy( + public addToAriaDescribedBy( element: HTMLElement, customConfig?: { idPrefix?: string | undefined; diff --git a/packages/form-integrations/docs/17-validation-examples.md b/packages/form-integrations/docs/17-validation-examples.md index 92b22ace3..1401d614d 100644 --- a/packages/form-integrations/docs/17-validation-examples.md +++ b/packages/form-integrations/docs/17-validation-examples.md @@ -58,11 +58,7 @@ Useful on input elements it allows to define how many characters can be entered. ```js preview-story export const stringValidators = () => html` - + { }); }); }); + +describe('detail.isTriggeredByUser', () => { + const allFormControls = [ + // 1) Fields + 'field', + // 1a) Input Fields + 'input', + 'input-amount', + 'input-date', + 'input-datepicker', + 'input-email', + 'input-iban', + 'input-range', + 'textarea', + // 1b) Choice Fields + 'option', + 'checkbox', + 'radio', + // 1c) Choice Group Fields + 'select', + 'listbox', + 'select-rich', + 'combobox', + // 2) FormGroups + // 2a) Choice FormGroups + 'checkbox-group', + 'radio-group', + // 2v) Fieldset + 'fieldset', + // 2c) Form + 'form', + ]; + + /** + * "isTriggeredByUser" for different types of fields: + * + * RegularField: + * - true: when change/input (c.q. user-input-changed) fired + * - false: when .modelValue set programmatically + * + * ChoiceField: + * - true: when 'change' event fired + * - false: when .modelValue (or checked) set programmatically + * + * OptionChoiceField: + * - true: when 'click' event fired + * - false: when .modelValue (or checked) set programmatically + * + * ChoiceGroupField (listbox, select-rich, combobox, radio-group, checkbox-group): + * - true: when child formElement condition for Choice Field is met + * - false: when child formElement condition for Choice Field is not met + * + * FormOrFieldset (fieldset, form): + * - true: when child formElement condition for Field is met + * - false: when child formElement condition for Field is not met + */ + + const featureDetectChoiceField = el => 'checked' in el && 'choiceValue' in el; + const featureDetectOptionChoiceField = el => 'active' in el; + + /** + * @param {FormControl} el + * @returns {'RegularField'|'ChoiceField'|'OptionChoiceField'|'ChoiceGroupField'|'FormOrFieldset'} + */ + function detectType(el) { + if (el._repropagationRole === 'child') { + if (featureDetectChoiceField(el)) { + return featureDetectOptionChoiceField(el) ? 'OptionChoiceField' : 'ChoiceField'; + } + return 'RegularField'; + } + return el._repropagationRole === 'choice-group' ? 'ChoiceGroupField' : 'FormOrFieldset'; + } + + /** + * @param {FormControl} el + * @param {string} newViewValue + * @returns {'RegularField'|'ChoiceField'|'OptionChoiceField'|'ChoiceGroupField'|'FormOrFieldset'} + */ + function mimicUserInput(el, newViewValue) { + const type = detectType(el); + let userInputEv; + if (type === 'RegularField') { + userInputEv = el._inputNode.tagName === 'SELECT' ? 'change' : 'input'; + el.value = newViewValue; // eslint-disable-line no-param-reassign + el._inputNode.dispatchEvent(new Event(userInputEv, { bubbles: true })); + } else if (type === 'ChoiceField') { + el._inputNode.dispatchEvent(new Event('change', { bubbles: true })); + } else if (type === 'OptionChoiceField') { + el.dispatchEvent(new Event('click', { bubbles: true })); + } + } + + allFormControls.forEach(controlName => { + it(`lion-${controlName} adds "detail.isTriggeredByUser" to model-value-changed event`, async () => { + const spy = sinon.spy(); + + const tagname = `lion-${controlName}`; + const tag = unsafeStatic(tagname); + let childrenEl; + if (controlName === 'select') { + childrenEl = await fixture( + html``, + ); + } else if (controlName === 'form') { + childrenEl = await fixture(html`
`); + } else if (controlName === 'field') { + childrenEl = await fixture(html``); + } + const el = await fixture(html`<${tag}>${childrenEl}`); + await el.registrationComplete; + el.addEventListener('model-value-changed', spy); + + function expectCorrectEventMetaRegularField(formControl) { + mimicUserInput(formControl, 'userValue', 'RegularField'); + expect(spy.firstCall.args[0].detail.isTriggeredByUser).to.be.true; + // eslint-disable-next-line no-param-reassign + formControl.modelValue = 'programmaticValue'; + expect(spy.secondCall.args[0].detail.isTriggeredByUser).to.be.false; + } + + function resetChoiceFieldToForceRepropagation(formControl) { + // eslint-disable-next-line no-param-reassign + formControl.checked = false; + spy.resetHistory(); + } + + function expectCorrectEventMetaChoiceField(formControl) { + resetChoiceFieldToForceRepropagation(formControl); + mimicUserInput(formControl, 'userValue', 'ChoiceField'); + expect(spy.firstCall.args[0].detail.isTriggeredByUser).to.be.true; + + resetChoiceFieldToForceRepropagation(formControl); + // eslint-disable-next-line no-param-reassign + formControl.checked = true; + expect(spy.firstCall.args[0].detail.isTriggeredByUser).to.be.false; + + // eslint-disable-next-line no-param-reassign + formControl.modelValue = { value: 'programmaticValue', checked: false }; + expect(spy.secondCall.args[0].detail.isTriggeredByUser).to.be.false; + } + + // 1. Derive the type of field we're dealing with + const type = detectType(el); + if (type === 'RegularField') { + expectCorrectEventMetaRegularField(el); + } else if (type === 'ChoiceField' || type === 'OptionChoiceField') { + expectCorrectEventMetaChoiceField(el); + } else if (type === 'ChoiceGroupField') { + let childName = 'option'; + if (controlName.endsWith('-group')) { + [childName] = controlName.split('-group'); + } + const childTagName = `lion-${childName}`; + const childTag = unsafeStatic(childTagName); + const childrenEls = await fixture( + html`
<${childTag}><${childTag}>
`, + ); + el.appendChild(childrenEls); + await el.registrationComplete; + expectCorrectEventMetaChoiceField(el.formElements[0]); + } else if (type === 'FormOrFieldset') { + const childrenEls = await fixture( + html`
`, + ); + el.appendChild(childrenEls); + await el.registrationComplete; + await el.updateComplete; + expectCorrectEventMetaRegularField(el.formElements[0]); + } + }); + }); +}); diff --git a/packages/listbox/src/LionOption.js b/packages/listbox/src/LionOption.js index 4ffa1adb1..8e70dd071 100644 --- a/packages/listbox/src/LionOption.js +++ b/packages/listbox/src/LionOption.js @@ -123,6 +123,7 @@ export class LionOption extends DisabledMixin(ChoiceInputMixin(FormRegisteringMi return; } const parentForm = /** @type {unknown} */ (this.__parentFormGroup); + this.__isHandlingUserInput = true; if (parentForm && /** @type {ChoiceGroupHost} */ (parentForm).multipleChoice) { this.checked = !this.checked; this.active = !this.active; @@ -130,5 +131,6 @@ export class LionOption extends DisabledMixin(ChoiceInputMixin(FormRegisteringMi this.checked = true; this.active = true; } + this.__isHandlingUserInput = false; } } diff --git a/packages/listbox/src/ListboxMixin.js b/packages/listbox/src/ListboxMixin.js index 3d9860662..0050e725f 100644 --- a/packages/listbox/src/ListboxMixin.js +++ b/packages/listbox/src/ListboxMixin.js @@ -14,6 +14,7 @@ import { LionOptions } from './LionOptions.js'; * @typedef {import('../types/ListboxMixinTypes').ListboxMixin} ListboxMixin * @typedef {import('../types/ListboxMixinTypes').ListboxHost} ListboxHost * @typedef {import('@lion/form-core/types/registration/FormRegistrarPortalMixinTypes').FormRegistrarPortalHost} FormRegistrarPortalHost + * @typedef {import('@lion/form-core/types/FormControlMixinTypes.js').ModelValueEventDetails} ModelValueEventDetails */ function uuid() { @@ -699,7 +700,13 @@ const ListboxMixinImplementation = superclass => // only send model-value-changed if the event is caused by one of its children if (ev.detail && ev.detail.formPath) { this.dispatchEvent( - new CustomEvent('model-value-changed', { detail: { element: ev.target } }), + new CustomEvent('model-value-changed', { + detail: /** @type {ModelValueEventDetails} */ ({ + formPath: ev.detail.formPath, + isTriggeredByUser: ev.detail.isTriggeredByUser, + element: ev.target, + }), + }), ); } this.__oldModelValue = this.modelValue; diff --git a/packages/listbox/test/lion-option.test.js b/packages/listbox/test/lion-option.test.js index 441482682..667a4cd34 100644 --- a/packages/listbox/test/lion-option.test.js +++ b/packages/listbox/test/lion-option.test.js @@ -13,6 +13,38 @@ describe('lion-option', () => { expect(el.modelValue).to.deep.equal({ value: 10, checked: false }); }); + it('fires model-value-changed on click', async () => { + let isTriggeredByUser; + const el = /** @type {LionOption} */ (await fixture(html` + + + `)); + el.dispatchEvent(new CustomEvent('click', { bubbles: true })); + expect(isTriggeredByUser).to.be.true; + }); + + it('fires model-value-changed on programmatic "checked" change', async () => { + let count = 0; + let isTriggeredByUser; + + const el = /** @type {LionOption} */ (await fixture(html` + + + `)); + el.checked = true; + expect(count).to.equal(1); + expect(isTriggeredByUser).to.be.false; + }); + it('can be checked', async () => { const el = /** @type {LionOption} */ (await fixture( html``,