govuk-frontend
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GOV.UK Frontend contains the code you need to start building a user interface for government platforms and services.
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{"version":3,"file":"button.bundle.mjs","sources":["../../../../src/govuk/common/index.mjs","../../../../src/govuk/errors/index.mjs","../../../../src/govuk/govuk-frontend-component.mjs","../../../../src/govuk/common/configuration.mjs","../../../../src/govuk/components/button/button.mjs"],"sourcesContent":["/**\n * Common helpers which do not require polyfill.\n *\n * IMPORTANT: If a helper require a polyfill, please isolate it in its own module\n * so that the polyfill can be properly tree-shaken and does not burden\n * the components that do not need that helper\n */\n\n/**\n * Get hash fragment from URL\n *\n * Extract the hash fragment (everything after the hash) from a URL,\n * but not including the hash symbol\n *\n * @private\n * @param {string} url - URL\n * @returns {string | undefined} Fragment from URL, without the hash\n */\nexport function getFragmentFromUrl(url) {\n if (!url.includes('#')) {\n return undefined\n }\n\n return url.split('#').pop()\n}\n\n/**\n * Get GOV.UK Frontend breakpoint value from CSS custom property\n *\n * @private\n * @param {string} name - Breakpoint name\n * @returns {{ property: string, value?: string }} Breakpoint object\n */\nexport function getBreakpoint(name) {\n const property = `--govuk-frontend-breakpoint-${name}`\n\n // Get value from `<html>` with breakpoints on CSS :root\n const value = window\n .getComputedStyle(document.documentElement)\n .getPropertyValue(property)\n\n return {\n property,\n value: value || undefined\n }\n}\n\n/**\n * Move focus to element\n *\n * Sets tabindex to -1 to make the element programmatically focusable,\n * but removes it on blur as the element doesn't need to be focused again.\n *\n * @private\n * @template {HTMLElement} FocusElement\n * @param {FocusElement} $element - HTML element\n * @param {object} [options] - Handler options\n * @param {function(this: FocusElement): void} [options.onBeforeFocus] - Callback before focus\n * @param {function(this: FocusElement): void} [options.onBlur] - Callback on blur\n */\nexport function setFocus($element, options = {}) {\n const isFocusable = $element.getAttribute('tabindex')\n\n if (!isFocusable) {\n $element.setAttribute('tabindex', '-1')\n }\n\n /**\n * Handle element focus\n */\n function onFocus() {\n $element.addEventListener('blur', onBlur, { once: true })\n }\n\n /**\n * Handle element blur\n */\n function onBlur() {\n options.onBlur?.call($element)\n\n if (!isFocusable) {\n $element.removeAttribute('tabindex')\n }\n }\n\n // Add listener to reset element on blur, after focus\n $element.addEventListener('focus', onFocus, { once: true })\n\n // Focus element\n options.onBeforeFocus?.call($element)\n $element.focus()\n}\n\n/**\n * Checks if component is already initialised\n *\n * @internal\n * @param {Element} $root - HTML element to be checked\n * @param {string} moduleName - name of component module\n * @returns {boolean} Whether component is already initialised\n */\nexport function isInitialised($root, moduleName) {\n return (\n $root instanceof HTMLElement &&\n $root.hasAttribute(`data-${moduleName}-init`)\n )\n}\n\n/**\n * Checks if GOV.UK Frontend is supported on this page\n *\n * Some browsers will load and run our JavaScript but GOV.UK Frontend\n * won't be supported.\n *\n * @param {HTMLElement | null} [$scope] - (internal) `<body>` HTML element checked for browser support\n * @returns {boolean} Whether GOV.UK Frontend is supported on this page\n */\nexport function isSupported($scope = document.body) {\n if (!$scope) {\n return false\n }\n\n return $scope.classList.contains('govuk-frontend-supported')\n}\n\n/**\n * Check for an array\n *\n * @internal\n * @param {unknown} option - Option to check\n * @returns {boolean} Whether the option is an array\n */\nfunction isArray(option) {\n return Array.isArray(option)\n}\n\n/**\n * Check for an object\n *\n * @internal\n * @param {unknown} option - Option to check\n * @returns {boolean} Whether the option is an object\n */\nexport function isObject(option) {\n return !!option && typeof option === 'object' && !isArray(option)\n}\n\n/**\n * Format error message\n *\n * @internal\n * @param {ComponentWithModuleName} Component - Component that threw the error\n * @param {string} message - Error message\n * @returns {string} - Formatted error message\n */\nexport function formatErrorMessage(Component, message) {\n return `${Component.moduleName}: ${message}`\n}\n\n/* eslint-disable jsdoc/valid-types --\n * `{new(...args: any[] ): object}` is not recognised as valid\n * https://github.com/gajus/eslint-plugin-jsdoc/issues/145#issuecomment-1308722878\n * https://github.com/jsdoc-type-pratt-parser/jsdoc-type-pratt-parser/issues/131\n **/\n\n/**\n * @typedef ComponentWithModuleName\n * @property {string} moduleName - Name of the component\n */\n\n/* eslint-enable jsdoc/valid-types */\n","import { formatErrorMessage } from '../common/index.mjs'\n\n/**\n * GOV.UK Frontend error\n *\n * A base class for `Error`s thrown by GOV.UK Frontend.\n *\n * It is meant to be extended into specific types of errors\n * to be thrown by our code.\n *\n * @example\n * ```js\n * class MissingRootError extends GOVUKFrontendError {\n * // Setting an explicit name is important as extending the class will not\n * // set a new `name` on the subclass. The `name` property is important\n * // to ensure intelligible error names even if the class name gets\n * // mangled by a minifier\n * name = \"MissingRootError\"\n * }\n * ```\n * @virtual\n */\nexport class GOVUKFrontendError extends Error {\n name = 'GOVUKFrontendError'\n}\n\n/**\n * Indicates that GOV.UK Frontend is not supported\n */\nexport class SupportError extends GOVUKFrontendError {\n name = 'SupportError'\n\n /**\n * Checks if GOV.UK Frontend is supported on this page\n *\n * @param {HTMLElement | null} [$scope] - HTML element `<body>` checked for browser support\n */\n constructor($scope = document.body) {\n const supportMessage =\n 'noModule' in HTMLScriptElement.prototype\n ? 'GOV.UK Frontend initialised without `<body class=\"govuk-frontend-supported\">` from template `<script>` snippet'\n : 'GOV.UK Frontend is not supported in this browser'\n\n super(\n $scope\n ? supportMessage\n : 'GOV.UK Frontend initialised without `<script type=\"module\">`'\n )\n }\n}\n\n/**\n * Indicates that a component has received an illegal configuration\n */\nexport class ConfigError extends GOVUKFrontendError {\n name = 'ConfigError'\n}\n\n/**\n * Indicates an issue with an element (possibly `null` or `undefined`)\n */\nexport class ElementError extends GOVUKFrontendError {\n name = 'ElementError'\n\n /**\n * @internal\n * @overload\n * @param {string} message - Element error message\n */\n\n /**\n * @internal\n * @overload\n * @param {ElementErrorOptions} options - Element error options\n */\n\n /**\n * @internal\n * @param {string | ElementErrorOptions} messageOrOptions - Element error message or options\n */\n constructor(messageOrOptions) {\n let message = typeof messageOrOptions === 'string' ? messageOrOptions : ''\n\n // Build message from options\n if (typeof messageOrOptions === 'object') {\n const { component, identifier, element, expectedType } = messageOrOptions\n\n message = identifier\n\n // Append reason\n message += element\n ? ` is not of type ${expectedType ?? 'HTMLElement'}`\n : ' not found'\n\n message = formatErrorMessage(component, message)\n }\n\n super(message)\n }\n}\n\n/**\n * Indicates that a component is already initialised\n */\nexport class InitError extends GOVUKFrontendError {\n name = 'InitError'\n\n /**\n * @internal\n * @param {ComponentWithModuleName | string} componentOrMessage - name of the component module\n */\n constructor(componentOrMessage) {\n const message =\n typeof componentOrMessage === 'string'\n ? componentOrMessage\n : formatErrorMessage(\n componentOrMessage,\n `Root element (\\`$root\\`) already initialised`\n )\n\n super(message)\n }\n}\n\n/**\n * Element error options\n *\n * @internal\n * @typedef {object} ElementErrorOptions\n * @property {string} identifier - An identifier that'll let the user understand which element has an error. This is whatever makes the most sense\n * @property {Element | null} [element] - The element in error\n * @property {string} [expectedType] - The type that was expected for the identifier\n * @property {ComponentWithModuleName} component - Component throwing the error\n */\n\n/**\n * @typedef {import('../common/index.mjs').ComponentWithModuleName} ComponentWithModuleName\n */\n","import { isInitialised, isSupported } from './common/index.mjs'\nimport { ElementError, InitError, SupportError } from './errors/index.mjs'\n\n/**\n * Base Component class\n *\n * Centralises the behaviours shared by our components\n *\n * @virtual\n * @template {Element} [RootElementType=HTMLElement]\n */\nexport class GOVUKFrontendComponent {\n /**\n * @type {typeof Element}\n */\n static elementType = HTMLElement\n\n // allows Typescript user to work around the lack of types\n // in GOVUKFrontend package, Typescript is not aware of $root\n // in components that extend GOVUKFrontendComponent\n /**\n * Returns the root element of the component\n *\n * @protected\n * @returns {RootElementType} - the root element of component\n */\n get $root() {\n return this._$root\n }\n\n /**\n * @protected\n * @type {RootElementType}\n */\n _$root\n\n /**\n * Constructs a new component, validating that GOV.UK Frontend is supported\n *\n * @internal\n * @param {Element | null} [$root] - HTML element to use for component\n */\n constructor($root) {\n const childConstructor = /** @type {ChildClassConstructor} */ (\n this.constructor\n )\n\n // TypeScript does not enforce that inheriting classes will define a `moduleName`\n // (even if we add a `@virtual` `static moduleName` property to this class).\n // While we trust users to do this correctly, we do a little check to provide them\n // a helpful error message.\n //\n // After this, we'll be sure that `childConstructor` has a `moduleName`\n // as expected of the `ChildClassConstructor` we've cast `this.constructor` to.\n if (typeof childConstructor.moduleName !== 'string') {\n throw new InitError(`\\`moduleName\\` not defined in component`)\n }\n\n if (!($root instanceof childConstructor.elementType)) {\n throw new ElementError({\n element: $root,\n component: childConstructor,\n identifier: 'Root element (`$root`)',\n expectedType: childConstructor.elementType.name\n })\n } else {\n this._$root = /** @type {RootElementType} */ ($root)\n }\n\n childConstructor.checkSupport()\n\n this.checkInitialised()\n\n const moduleName = childConstructor.moduleName\n\n this.$root.setAttribute(`data-${moduleName}-init`, '')\n }\n\n /**\n * Validates whether component is already initialised\n *\n * @private\n * @throws {InitError} when component is already initialised\n */\n checkInitialised() {\n const constructor = /** @type {ChildClassConstructor} */ (this.constructor)\n const moduleName = constructor.moduleName\n\n if (moduleName && isInitialised(this.$root, moduleName)) {\n throw new InitError(constructor)\n }\n }\n\n /**\n * Validates whether components are supported\n *\n * @throws {SupportError} when the components are not supported\n */\n static checkSupport() {\n if (!isSupported()) {\n throw new SupportError()\n }\n }\n}\n\n/**\n * @typedef ChildClass\n * @property {string} moduleName - The module name that'll be looked for in the DOM when initialising the component\n */\n\n/**\n * @typedef {typeof GOVUKFrontendComponent & ChildClass} ChildClassConstructor\n */\n","import { ConfigError } from '../errors/index.mjs'\nimport { GOVUKFrontendComponent } from '../govuk-frontend-component.mjs'\n\nimport { isObject, formatErrorMessage } from './index.mjs'\n\nexport const configOverride = Symbol.for('configOverride')\n\n/**\n * Base Component class\n *\n * Centralises the behaviours shared by our components\n *\n * @virtual\n * @template {ObjectNested} [ConfigurationType={}]\n * @template {Element & { dataset: DOMStringMap }} [RootElementType=HTMLElement]\n * @augments GOVUKFrontendComponent<RootElementType>\n */\nexport class ConfigurableComponent extends GOVUKFrontendComponent {\n /**\n * configOverride\n *\n * Function which defines configuration overrides to prioritize\n * properties from the root element's dataset.\n *\n * It should take a subset of configuration as input and return\n * a new configuration object with properties that should be\n * overridden based on the root element's dataset. A Symbol\n * is used for indexing to prevent conflicts.\n *\n * @internal\n * @virtual\n * @param {ObjectNested} [param] - Configuration object\n * @returns {ObjectNested} return - Configuration object\n */\n // eslint-disable-next-line @typescript-eslint/no-unused-vars\n [configOverride](param) {\n return {}\n }\n\n /**\n * Returns the root element of the component\n *\n * @protected\n * @returns {ConfigurationType} - the root element of component\n */\n get config() {\n return this._config\n }\n\n /**\n *\n * @type {ConfigurationType}\n */\n _config\n\n /**\n * Constructs a new component, validating that GOV.UK Frontend is supported\n *\n * @internal\n * @param {Element | null} [$root] - HTML element to use for component\n * @param {ConfigurationType} [config] - HTML element to use for component\n */\n constructor($root, config) {\n super($root)\n\n const childConstructor =\n /** @type {ChildClassConstructor<ConfigurationType>} */ (this.constructor)\n\n if (typeof childConstructor.defaults === 'undefined') {\n throw new ConfigError(\n formatErrorMessage(\n childConstructor,\n 'Config passed as parameter into constructor but no defaults defined'\n )\n )\n }\n\n const datasetConfig = /** @type {ConfigurationType} */ (\n normaliseDataset(childConstructor, this._$root.dataset)\n )\n\n this._config = /** @type {ConfigurationType} */ (\n mergeConfigs(\n childConstructor.defaults,\n config ?? {},\n this[configOverride](datasetConfig),\n datasetConfig\n )\n )\n }\n}\n\n/**\n * Normalise string\n *\n * 'If it looks like a duck, and it quacks like a duck…' 🦆\n *\n * If the passed value looks like a boolean or a number, convert it to a boolean\n * or number.\n *\n * Designed to be used to convert config passed via data attributes (which are\n * always strings) into something sensible.\n *\n * @internal\n * @param {DOMStringMap[string]} value - The value to normalise\n * @param {SchemaProperty} [property] - Component schema property\n * @returns {string | boolean | number | undefined} Normalised data\n */\nexport function normaliseString(value, property) {\n const trimmedValue = value ? value.trim() : ''\n\n let output\n let outputType = property?.type\n\n // No schema type set? Determine automatically\n if (!outputType) {\n if (['true', 'false'].includes(trimmedValue)) {\n outputType = 'boolean'\n }\n\n // Empty / whitespace-only strings are considered finite so we need to check\n // the length of the trimmed string as well\n if (trimmedValue.length > 0 && isFinite(Number(trimmedValue))) {\n outputType = 'number'\n }\n }\n\n switch (outputType) {\n case 'boolean':\n output = trimmedValue === 'true'\n break\n\n case 'number':\n output = Number(trimmedValue)\n break\n\n default:\n output = value\n }\n\n return output\n}\n\n/**\n * Normalise dataset\n *\n * Loop over an object and normalise each value using {@link normaliseString},\n * optionally expanding nested `i18n.field`\n *\n * @internal\n * @param {{ schema?: Schema, moduleName: string }} Component - Component class\n * @param {DOMStringMap} dataset - HTML element dataset\n * @returns {ObjectNested} Normalised dataset\n */\nexport function normaliseDataset(Component, dataset) {\n if (typeof Component.schema === 'undefined') {\n throw new ConfigError(\n formatErrorMessage(\n Component,\n 'Config passed as parameter into constructor but no schema defined'\n )\n )\n }\n\n const out = /** @type {ReturnType<typeof normaliseDataset>} */ ({})\n\n // Normalise top-level dataset ('data-*') values using schema types\n for (const [field, property] of Object.entries(Component.schema.properties)) {\n if (field in dataset) {\n out[field] = normaliseString(dataset[field], property)\n }\n\n /**\n * Extract and normalise nested object values automatically using\n * {@link normaliseString} but only schema object types are allowed\n */\n if (property?.type === 'object') {\n out[field] = extractConfigByNamespace(Component.schema, dataset, field)\n }\n }\n\n return out\n}\n\n/**\n * Config merging function\n *\n * Takes any number of objects and combines them together, with\n * greatest priority on the LAST item passed in.\n *\n * @internal\n * @param {...{ [key: string]: unknown }} configObjects - Config objects to merge\n * @returns {{ [key: string]: unknown }} A merged config object\n */\nexport function mergeConfigs(...configObjects) {\n // Start with an empty object as our base\n /** @type {{ [key: string]: unknown }} */\n const formattedConfigObject = {}\n\n // Loop through each of the passed objects\n for (const configObject of configObjects) {\n for (const key of Object.keys(configObject)) {\n const option = formattedConfigObject[key]\n const override = configObject[key]\n\n // Push their keys one-by-one into formattedConfigObject. Any duplicate\n // keys with object values will be merged, otherwise the new value will\n // override the existing value.\n if (isObject(option) && isObject(override)) {\n // @ts-expect-error Index signature for type 'string' is missing\n formattedConfigObject[key] = mergeConfigs(option, override)\n } else {\n // Apply override\n formattedConfigObject[key] = override\n }\n }\n }\n\n return formattedConfigObject\n}\n\n/**\n * Validate component config by schema\n *\n * Follows limited examples in JSON schema for wider support in future\n *\n * {@link https://ajv.js.org/json-schema.html#compound-keywords}\n * {@link https://ajv.js.org/packages/ajv-errors.html#single-message}\n *\n * @internal\n * @param {Schema} schema - Config schema\n * @param {{ [key: string]: unknown }} config - Component config\n * @returns {string[]} List of validation errors\n */\nexport function validateConfig(schema, config) {\n const validationErrors = []\n\n // Check errors for each schema\n for (const [name, conditions] of Object.entries(schema)) {\n const errors = []\n\n // Check errors for each schema condition\n if (Array.isArray(conditions)) {\n for (const { required, errorMessage } of conditions) {\n if (!required.every((key) => !!config[key])) {\n errors.push(errorMessage) // Missing config key value\n }\n }\n\n // Check one condition passes or add errors\n if (name === 'anyOf' && !(conditions.length - errors.length >= 1)) {\n validationErrors.push(...errors)\n }\n }\n }\n\n return validationErrors\n}\n\n/**\n * Extracts keys starting with a particular namespace from dataset ('data-*')\n * object, removing the namespace in the process, normalising all values\n *\n * @internal\n * @param {Schema} schema - The schema of a component\n * @param {DOMStringMap} dataset - The object to extract key-value pairs from\n * @param {string} namespace - The namespace to filter keys with\n * @returns {ObjectNested | undefined} Nested object with dot-separated key namespace removed\n */\nexport function extractConfigByNamespace(schema, dataset, namespace) {\n const property = schema.properties[namespace]\n\n // Only extract configs for object schema properties\n if (property?.type !== 'object') {\n return\n }\n\n // Add default empty config\n const newObject = {\n [namespace]: /** @type {ObjectNested} */ ({})\n }\n\n for (const [key, value] of Object.entries(dataset)) {\n /** @type {ObjectNested | ObjectNested[NestedKey]} */\n let current = newObject\n\n // Split the key into parts, using . as our namespace separator\n const keyParts = key.split('.')\n\n /**\n * Create new level per part\n *\n * e.g. 'i18n.textareaDescription.other' becomes\n * `{ i18n: { textareaDescription: { other } } }`\n */\n for (const [index, name] of keyParts.entries()) {\n if (typeof current === 'object') {\n // Drop down to nested object until the last part\n if (index < keyParts.length - 1) {\n // New nested object (optionally) replaces existing value\n if (!isObject(current[name])) {\n current[name] = {}\n }\n\n // Drop down into new or existing nested object\n current = current[name]\n } else if (key !== namespace) {\n // Normalised value (optionally) replaces existing value\n current[name] = normaliseString(value)\n }\n }\n }\n }\n\n return newObject[namespace]\n}\n\n/**\n * @internal\n * @typedef {keyof ObjectNested} NestedKey\n * @typedef {{ [key: string]: string | boolean | number | ObjectNested | undefined }} ObjectNested\n */\n\n/**\n * Schema for component config\n *\n * @typedef {object} Schema\n * @property {{ [field: string]: SchemaProperty | undefined }} properties - Schema properties\n * @property {SchemaCondition[]} [anyOf] - List of schema conditions\n */\n\n/**\n * Schema property for component config\n *\n * @typedef {object} SchemaProperty\n * @property {'string' | 'boolean' | 'number' | 'object'} type - Property type\n */\n\n/**\n * Schema condition for component config\n *\n * @typedef {object} SchemaCondition\n * @property {string[]} required - List of required config fields\n * @property {string} errorMessage - Error message when required config fields not provided\n */\n\n/**\n * @template {ObjectNested} [ConfigurationType={}]\n * @typedef ChildClass\n * @property {string} moduleName - The module name that'll be looked for in the DOM when initialising the component\n * @property {Schema} [schema] - The schema of the component configuration\n * @property {ConfigurationType} [defaults] - The default values of the configuration of the component\n */\n\n/**\n * @template {ObjectNested} [ConfigurationType={}]\n * @typedef {typeof GOVUKFrontendComponent & ChildClass<ConfigurationType>} ChildClassConstructor<ConfigurationType>\n */\n","import { ConfigurableComponent } from '../../common/configuration.mjs'\n\nconst DEBOUNCE_TIMEOUT_IN_SECONDS = 1\n\n/**\n * JavaScript enhancements for the Button component\n *\n * @preserve\n * @augments ConfigurableComponent<ButtonConfig>\n */\nexport class Button extends ConfigurableComponent {\n /**\n * @private\n * @type {number | null}\n */\n debounceFormSubmitTimer = null\n\n /**\n * @param {Element | null} $root - HTML element to use for button\n * @param {ButtonConfig} [config] - Button config\n */\n constructor($root, config = {}) {\n super($root, config)\n\n this.$root.addEventListener('keydown', (event) => this.handleKeyDown(event))\n this.$root.addEventListener('click', (event) => this.debounce(event))\n }\n\n /**\n * Trigger a click event when the space key is pressed\n *\n * Some screen readers tell users they can use the space bar to activate\n * things with the 'button' role, so we need to match the functionality of\n * native HTML buttons.\n *\n * See https://github.com/alphagov/govuk_elements/pull/272#issuecomment-233028270\n *\n * @private\n * @param {KeyboardEvent} event - Keydown event\n */\n handleKeyDown(event) {\n const $target = event.target\n\n // Handle space bar only\n if (event.key !== ' ') {\n return\n }\n\n // Handle elements with [role=\"button\"] only\n if (\n $target instanceof HTMLElement &&\n $target.getAttribute('role') === 'button'\n ) {\n event.preventDefault() // prevent the page from scrolling\n $target.click()\n }\n }\n\n /**\n * Debounce double-clicks\n *\n * If the click quickly succeeds a previous click then nothing will happen.\n * This stops people accidentally causing multiple form submissions by double\n * clicking buttons.\n *\n * @private\n * @param {MouseEvent} event - Mouse click event\n * @returns {undefined | false} Returns undefined, or false when debounced\n */\n debounce(event) {\n // Check the button that was clicked has preventDoubleClick enabled\n if (!this.config.preventDoubleClick) {\n return\n }\n\n // If the timer is still running, prevent the click from submitting the form\n if (this.debounceFormSubmitTimer) {\n event.preventDefault()\n return false\n }\n\n this.debounceFormSubmitTimer = window.setTimeout(() => {\n this.debounceFormSubmitTimer = null\n }, DEBOUNCE_TIMEOUT_IN_SECONDS * 1000)\n }\n\n /**\n * Name for the component used when initialising using data-module attributes.\n */\n static moduleName = 'govuk-button'\n\n /**\n * Button default config\n *\n * @see {@link ButtonConfig}\n * @constant\n * @type {ButtonConfig}\n */\n static defaults = Object.freeze({\n preventDoubleClick: false\n })\n\n /**\n * Button config schema\n *\n * @constant\n * @satisfies {Schema}\n */\n static schema = Object.freeze({\n properties: {\n preventDoubleClick: { type: 'boolean' }\n }\n })\n}\n\n/**\n * Button config\n *\n * @typedef {object} ButtonConfig\n * @property {boolean} [preventDoubleClick=false] - Prevent accidental double\n * clicks on submit buttons from submitting forms multiple times.\n */\n\n/**\n * @typedef {import('../../common/configuration.mjs').Schema} Schema\n 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