{"version":3,"file":"character-count.mjs","sources":["../../../../src/govuk/components/character-count/character-count.mjs"],"sourcesContent":["import { closestAttributeValue } from '../../common/closest-attribute-value.mjs'\nimport { mergeConfigs, validateConfig } from '../../common/index.mjs'\nimport { normaliseDataset } from '../../common/normalise-dataset.mjs'\nimport { ConfigError, ElementError } from '../../errors/index.mjs'\nimport { GOVUKFrontendComponent } from '../../govuk-frontend-component.mjs'\nimport { I18n } from '../../i18n.mjs'\n\n/**\n * Character count component\n *\n * Tracks the number of characters or words in the `.govuk-js-character-count`\n * `<textarea>` inside the element. Displays a message with the remaining number\n * of characters/words available, or the number of characters/words in excess.\n *\n * You can configure the message to only appear after a certain percentage\n * of the available characters/words has been entered.\n *\n * @preserve\n */\nexport class CharacterCount extends GOVUKFrontendComponent {\n  /** @private */\n  $module\n\n  /** @private */\n  $textarea\n\n  /** @private */\n  $visibleCountMessage\n\n  /** @private */\n  $screenReaderCountMessage\n\n  /**\n   * @private\n   * @type {number | null}\n   */\n  lastInputTimestamp = null\n\n  /** @private */\n  lastInputValue = ''\n\n  /**\n   * @private\n   * @type {number | null}\n   */\n  valueChecker = null\n\n  /**\n   * @private\n   * @type {CharacterCountConfig}\n   */\n  config\n\n  /** @private */\n  i18n\n\n  /** @private */\n  maxLength\n\n  /**\n   * @param {Element | null} $module - HTML element to use for character count\n   * @param {CharacterCountConfig} [config] - Character count config\n   */\n  constructor($module, config = {}) {\n    super()\n\n    if (!($module instanceof HTMLElement)) {\n      throw new ElementError({\n        componentName: 'Character count',\n        element: $module,\n        identifier: 'Root element (`$module`)'\n      })\n    }\n\n    const $textarea = $module.querySelector('.govuk-js-character-count')\n    if (\n      !(\n        $textarea instanceof HTMLTextAreaElement ||\n        $textarea instanceof HTMLInputElement\n      )\n    ) {\n      throw new ElementError({\n        componentName: 'Character count',\n        element: $textarea,\n        expectedType: 'HTMLTextareaElement or HTMLInputElement',\n        identifier: 'Form field (`.govuk-js-character-count`)'\n      })\n    }\n\n    // Read config set using dataset ('data-' values)\n    const datasetConfig = normaliseDataset(CharacterCount, $module.dataset)\n\n    // To ensure data-attributes take complete precedence, even if they change\n    // the type of count, we need to reset the `maxlength` and `maxwords` from\n    // the JavaScript config.\n    //\n    // We can't mutate `config`, though, as it may be shared across multiple\n    // components inside `initAll`.\n    /** @type {CharacterCountConfig} */\n    let configOverrides = {}\n    if ('maxwords' in datasetConfig || 'maxlength' in datasetConfig) {\n      configOverrides = {\n        maxlength: undefined,\n        maxwords: undefined\n      }\n    }\n\n    this.config = mergeConfigs(\n      CharacterCount.defaults,\n      config,\n      configOverrides,\n      datasetConfig\n    )\n\n    // Check for valid config\n    const errors = validateConfig(CharacterCount.schema, this.config)\n    if (errors[0]) {\n      throw new ConfigError(`Character count: ${errors[0]}`)\n    }\n\n    this.i18n = new I18n(this.config.i18n, {\n      // Read the fallback if necessary rather than have it set in the defaults\n      locale: closestAttributeValue($module, 'lang')\n    })\n\n    // Determine the limit attribute (characters or words)\n    this.maxLength = this.config.maxwords ?? this.config.maxlength ?? Infinity\n\n    this.$module = $module\n    this.$textarea = $textarea\n\n    const textareaDescriptionId = `${this.$textarea.id}-info`\n    const $textareaDescription = document.getElementById(textareaDescriptionId)\n    if (!$textareaDescription) {\n      throw new ElementError({\n        componentName: 'Character count',\n        element: $textareaDescription,\n        identifier: `Count message (\\`id=\"${textareaDescriptionId}\"\\`)`\n      })\n    }\n\n    // Inject a description for the textarea if none is present already\n    // for when the component was rendered with no maxlength, maxwords\n    // nor custom textareaDescriptionText\n    if (`${$textareaDescription.textContent}`.match(/^\\s*$/)) {\n      $textareaDescription.textContent = this.i18n.t('textareaDescription', {\n        count: this.maxLength\n      })\n    }\n\n    // Move the textarea description to be immediately after the textarea\n    // Kept for backwards compatibility\n    this.$textarea.insertAdjacentElement('afterend', $textareaDescription)\n\n    // Create the *screen reader* specific live-updating counter\n    // This doesn't need any styling classes, as it is never visible\n    const $screenReaderCountMessage = document.createElement('div')\n    $screenReaderCountMessage.className =\n      'govuk-character-count__sr-status govuk-visually-hidden'\n    $screenReaderCountMessage.setAttribute('aria-live', 'polite')\n    this.$screenReaderCountMessage = $screenReaderCountMessage\n    $textareaDescription.insertAdjacentElement(\n      'afterend',\n      $screenReaderCountMessage\n    )\n\n    // Create our live-updating counter element, copying the classes from the\n    // textarea description for backwards compatibility as these may have been\n    // configured\n    const $visibleCountMessage = document.createElement('div')\n    $visibleCountMessage.className = $textareaDescription.className\n    $visibleCountMessage.classList.add('govuk-character-count__status')\n    $visibleCountMessage.setAttribute('aria-hidden', 'true')\n    this.$visibleCountMessage = $visibleCountMessage\n    $textareaDescription.insertAdjacentElement('afterend', $visibleCountMessage)\n\n    // Hide the textarea description\n    $textareaDescription.classList.add('govuk-visually-hidden')\n\n    // Remove hard limit if set\n    this.$textarea.removeAttribute('maxlength')\n\n    this.bindChangeEvents()\n\n    // When the page is restored after navigating 'back' in some browsers the\n    // state of form controls is not restored until *after* the DOMContentLoaded\n    // event is fired, so we need to sync after the pageshow event.\n    window.addEventListener('pageshow', () => this.updateCountMessage())\n\n    // Although we've set up handlers to sync state on the pageshow event, init\n    // could be called after those events have fired, for example if they are\n    // added to the page dynamically, so update now too.\n    this.updateCountMessage()\n  }\n\n  /**\n   * Bind change events\n   *\n   * Set up event listeners on the $textarea so that the count messages update\n   * when the user types.\n   *\n   * @private\n   */\n  bindChangeEvents() {\n    this.$textarea.addEventListener('keyup', () => this.handleKeyUp())\n\n    // Bind focus/blur events to start/stop polling\n    this.$textarea.addEventListener('focus', () => this.handleFocus())\n    this.$textarea.addEventListener('blur', () => this.handleBlur())\n  }\n\n  /**\n   * Handle key up event\n   *\n   * Update the visible character counter and keep track of when the last update\n   * happened for each keypress\n   *\n   * @private\n   */\n  handleKeyUp() {\n    this.updateVisibleCountMessage()\n    this.lastInputTimestamp = Date.now()\n  }\n\n  /**\n   * Handle focus event\n   *\n   * Speech recognition software such as Dragon NaturallySpeaking will modify\n   * the fields by directly changing its `value`. These changes don't trigger\n   * events in JavaScript, so we need to poll to handle when and if they occur.\n   *\n   * Once the keyup event hasn't been detected for at least 1000 ms (1s), check\n   * if the textarea value has changed and update the count message if it has.\n   *\n   * This is so that the update triggered by the manual comparison doesn't\n   * conflict with debounced KeyboardEvent updates.\n   *\n   * @private\n   */\n  handleFocus() {\n    this.valueChecker = window.setInterval(() => {\n      if (\n        !this.lastInputTimestamp ||\n        Date.now() - 500 >= this.lastInputTimestamp\n      ) {\n        this.updateIfValueChanged()\n      }\n    }, 1000)\n  }\n\n  /**\n   * Handle blur event\n   *\n   * Stop checking the textarea value once the textarea no longer has focus\n   *\n   * @private\n   */\n  handleBlur() {\n    // Cancel value checking on blur\n    if (this.valueChecker) {\n      window.clearInterval(this.valueChecker)\n    }\n  }\n\n  /**\n   * Update count message if textarea value has changed\n   *\n   * @private\n   */\n  updateIfValueChanged() {\n    if (this.$textarea.value !== this.lastInputValue) {\n      this.lastInputValue = this.$textarea.value\n      this.updateCountMessage()\n    }\n  }\n\n  /**\n   * Update count message\n   *\n   * Helper function to update both the visible and screen reader-specific\n   * counters simultaneously (e.g. on init)\n   *\n   * @private\n   */\n  updateCountMessage() {\n    this.updateVisibleCountMessage()\n    this.updateScreenReaderCountMessage()\n  }\n\n  /**\n   * Update visible count message\n   *\n   * @private\n   */\n  updateVisibleCountMessage() {\n    const remainingNumber = this.maxLength - this.count(this.$textarea.value)\n    const isError = remainingNumber < 0\n\n    // If input is over the threshold, remove the disabled class which renders\n    // the counter invisible.\n    this.$visibleCountMessage.classList.toggle(\n      'govuk-character-count__message--disabled',\n      !this.isOverThreshold()\n    )\n\n    // Update styles\n    this.$textarea.classList.toggle('govuk-textarea--error', isError)\n    this.$visibleCountMessage.classList.toggle('govuk-error-message', isError)\n    this.$visibleCountMessage.classList.toggle('govuk-hint', !isError)\n\n    // Update message\n    this.$visibleCountMessage.textContent = this.getCountMessage()\n  }\n\n  /**\n   * Update screen reader count message\n   *\n   * @private\n   */\n  updateScreenReaderCountMessage() {\n    // If over the threshold, remove the aria-hidden attribute, allowing screen\n    // readers to announce the content of the element.\n    if (this.isOverThreshold()) {\n      this.$screenReaderCountMessage.removeAttribute('aria-hidden')\n    } else {\n      this.$screenReaderCountMessage.setAttribute('aria-hidden', 'true')\n    }\n\n    // Update message\n    this.$screenReaderCountMessage.textContent = this.getCountMessage()\n  }\n\n  /**\n   * Count the number of characters (or words, if `config.maxwords` is set)\n   * in the given text\n   *\n   * @private\n   * @param {string} text - The text to count the characters of\n   * @returns {number} the number of characters (or words) in the text\n   */\n  count(text) {\n    if (this.config.maxwords) {\n      const tokens = text.match(/\\S+/g) ?? [] // Matches consecutive non-whitespace chars\n      return tokens.length\n    }\n\n    return text.length\n  }\n\n  /**\n   * Get count message\n   *\n   * @private\n   * @returns {string} Status message\n   */\n  getCountMessage() {\n    const remainingNumber = this.maxLength - this.count(this.$textarea.value)\n    const countType = this.config.maxwords ? 'words' : 'characters'\n    return this.formatCountMessage(remainingNumber, countType)\n  }\n\n  /**\n   * Formats the message shown to users according to what's counted\n   * and how many remain\n   *\n   * @private\n   * @param {number} remainingNumber - The number of words/characaters remaining\n   * @param {string} countType - \"words\" or \"characters\"\n   * @returns {string} Status message\n   */\n  formatCountMessage(remainingNumber, countType) {\n    if (remainingNumber === 0) {\n      return this.i18n.t(`${countType}AtLimit`)\n    }\n\n    const translationKeySuffix =\n      remainingNumber < 0 ? 'OverLimit' : 'UnderLimit'\n\n    return this.i18n.t(`${countType}${translationKeySuffix}`, {\n      count: Math.abs(remainingNumber)\n    })\n  }\n\n  /**\n   * Check if count is over threshold\n   *\n   * Checks whether the value is over the configured threshold for the input.\n   * If there is no configured threshold, it is set to 0 and this function will\n   * always return true.\n   *\n   * @private\n   * @returns {boolean} true if the current count is over the config.threshold\n   *   (or no threshold is set)\n   */\n  isOverThreshold() {\n    // No threshold means we're always above threshold so save some computation\n    if (!this.config.threshold) {\n      return true\n    }\n\n    // Determine the remaining number of characters/words\n    const currentLength = this.count(this.$textarea.value)\n    const maxLength = this.maxLength\n\n    const thresholdValue = (maxLength * this.config.threshold) / 100\n\n    return thresholdValue <= currentLength\n  }\n\n  /**\n   * Name for the component used when initialising using data-module attributes.\n   */\n  static moduleName = 'govuk-character-count'\n\n  /**\n   * Character count default config\n   *\n   * @see {@link CharacterCountConfig}\n   * @constant\n   * @type {CharacterCountConfig}\n   */\n  static defaults = Object.freeze({\n    threshold: 0,\n    i18n: {\n      // Characters\n      charactersUnderLimit: {\n        one: 'You have %{count} character remaining',\n        other: 'You have %{count} characters remaining'\n      },\n      charactersAtLimit: 'You have 0 characters remaining',\n      charactersOverLimit: {\n        one: 'You have %{count} character too many',\n        other: 'You have %{count} characters too many'\n      },\n      // Words\n      wordsUnderLimit: {\n        one: 'You have %{count} word remaining',\n        other: 'You have %{count} words remaining'\n      },\n      wordsAtLimit: 'You have 0 words remaining',\n      wordsOverLimit: {\n        one: 'You have %{count} word too many',\n        other: 'You have %{count} words too many'\n      },\n      textareaDescription: {\n        other: ''\n      }\n    }\n  })\n\n  /**\n   * Character count config schema\n   *\n   * @constant\n   * @satisfies {Schema}\n   */\n  static schema = Object.freeze({\n    properties: {\n      i18n: { type: 'object' },\n      maxwords: { type: 'number' },\n      maxlength: { type: 'number' },\n      threshold: { type: 'number' }\n    },\n    anyOf: [\n      {\n        required: ['maxwords'],\n        errorMessage: 'Either \"maxlength\" or \"maxwords\" must be provided'\n      },\n      {\n        required: ['maxlength'],\n        errorMessage: 'Either \"maxlength\" or \"maxwords\" must be provided'\n      }\n    ]\n  })\n}\n\n/**\n * Character count config\n *\n * @see {@link CharacterCount.defaults}\n * @typedef {object} CharacterCountConfig\n * @property {number} [maxlength] - The maximum number of characters.\n *   If maxwords is provided, the maxlength option will be ignored.\n * @property {number} [maxwords] - The maximum number of words. If maxwords is\n *   provided, the maxlength option will be ignored.\n * @property {number} [threshold=0] - The percentage value of the limit at\n *   which point the count message is displayed. If this attribute is set, the\n *   count message will be hidden by default.\n * @property {CharacterCountTranslations} [i18n=CharacterCount.defaults.i18n] - Character count translations\n */\n\n/**\n * Character count translations\n *\n * @see {@link CharacterCount.defaults.i18n}\n * @typedef {object} CharacterCountTranslations\n *\n * Messages shown to users as they type. It provides feedback on how many words\n * or characters they have remaining or if they are over the limit. This also\n * includes a message used as an accessible description for the textarea.\n * @property {TranslationPluralForms} [charactersUnderLimit] - Message displayed\n *   when the number of characters is under the configured maximum, `maxlength`.\n *   This message is displayed visually and through assistive technologies. The\n *   component will replace the `%{count}` placeholder with the number of\n *   remaining characters. This is a [pluralised list of\n *   messages](https://frontend.design-system.service.gov.uk/localise-govuk-frontend).\n * @property {string} [charactersAtLimit] - Message displayed when the number of\n *   characters reaches the configured maximum, `maxlength`. This message is\n *   displayed visually and through assistive technologies.\n * @property {TranslationPluralForms} [charactersOverLimit] - Message displayed\n *   when the number of characters is over the configured maximum, `maxlength`.\n *   This message is displayed visually and through assistive technologies. The\n *   component will replace the `%{count}` placeholder with the number of\n *   remaining characters. This is a [pluralised list of\n *   messages](https://frontend.design-system.service.gov.uk/localise-govuk-frontend).\n * @property {TranslationPluralForms} [wordsUnderLimit] - Message displayed when\n *   the number of words is under the configured maximum, `maxlength`. This\n *   message is displayed visually and through assistive technologies. The\n *   component will replace the `%{count}` placeholder with the number of\n *   remaining words. This is a [pluralised list of\n *   messages](https://frontend.design-system.service.gov.uk/localise-govuk-frontend).\n * @property {string} [wordsAtLimit] - Message displayed when the number of\n *   words reaches the configured maximum, `maxlength`. This message is\n *   displayed visually and through assistive technologies.\n * @property {TranslationPluralForms} [wordsOverLimit] - Message displayed when\n *   the number of words is over the configured maximum, `maxlength`. This\n *   message is displayed visually and through assistive technologies. The\n *   component will replace the `%{count}` placeholder with the number of\n *   remaining words. This is a [pluralised list of\n *   messages](https://frontend.design-system.service.gov.uk/localise-govuk-frontend).\n * @property {TranslationPluralForms} [textareaDescription] - Message made\n *   available to assistive technologies, if none is already present in the\n *   HTML, to describe that the component accepts only a limited amount of\n *   content. It is visible on the page when JavaScript is unavailable. The\n *   component will replace the `%{count}` placeholder with the value of the\n *   `maxlength` or `maxwords` parameter.\n */\n\n/**\n * @typedef {import('../../common/index.mjs').Schema} Schema\n * @typedef {import('../../i18n.mjs').TranslationPluralForms} TranslationPluralForms\n 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