govuk-frontend/dist/govuk/components/file-upload/file-upload.mjs.map

GOV.UK Frontend contains the code you need to start building a user interface for government platforms and services.

{"version":3,"file":"file-upload.mjs","sources":["../../../../src/govuk/components/file-upload/file-upload.mjs"],"sourcesContent":["import { closestAttributeValue } from '../../common/closest-attribute-value.mjs'\nimport { ConfigurableComponent } from '../../common/configuration.mjs'\nimport { formatErrorMessage } from '../../common/index.mjs'\nimport { ElementError } from '../../errors/index.mjs'\nimport { I18n } from '../../i18n.mjs'\n\n/**\n * File upload component\n *\n * @preserve\n * @augments ConfigurableComponent<FileUploadConfig>\n */\nexport class FileUpload extends ConfigurableComponent {\n  /**\n   * @private\n   * @type {HTMLFileInputElement}\n   */\n  $input\n\n  /**\n   * @private\n   */\n  $button\n\n  /**\n   * @private\n   */\n  $status\n\n  /** @private */\n  i18n\n\n  /** @private */\n  id\n\n  /** @private */\n  $announcements\n\n  /**\n   * @private\n   * @type {boolean | undefined}\n   */\n  enteredAnotherElement\n\n  /**\n   * @param {Element | null} $root - File input element\n   * @param {FileUploadConfig} [config] - File Upload config\n   */\n  constructor($root, config = {}) {\n    super($root, config)\n\n    const $input = this.$root.querySelector('input')\n\n    if ($input === null) {\n      throw new ElementError({\n        component: FileUpload,\n        identifier: 'File inputs (`<input type=\"file\">`)'\n      })\n    }\n\n    if ($input.type !== 'file') {\n      throw new ElementError(\n        formatErrorMessage(\n          FileUpload,\n          'File input (`<input type=\"file\">`) attribute (`type`) is not `file`'\n        )\n      )\n    }\n\n    this.$input = /** @type {HTMLFileInputElement} */ ($input)\n\n    if (!this.$input.id) {\n      throw new ElementError({\n        component: FileUpload,\n        identifier: 'File input (`<input type=\"file\">`) attribute (`id`)'\n      })\n    }\n\n    this.id = this.$input.id\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(this.$root, 'lang')\n    })\n\n    const $label = this.findLabel()\n    // Add an ID to the label if it doesn't have one already\n    // so it can be referenced by `aria-labelledby`\n    if (!$label.id) {\n      $label.id = `${this.id}-label`\n    }\n\n    // we need to copy the 'id' of the root element\n    // to the new button replacement element\n    // so that focus will work in the error summary\n    this.$input.id = `${this.id}-input`\n\n    // Hide the native input\n    this.$input.setAttribute('hidden', 'true')\n\n    // Create the file selection button\n    const $button = document.createElement('button')\n    $button.classList.add('govuk-file-upload-button')\n    $button.type = 'button'\n    $button.id = this.id\n    $button.classList.add('govuk-file-upload-button--empty')\n\n    // Copy `aria-describedby` if present so hints and errors\n    // are associated to the `<button>`\n    const ariaDescribedBy = this.$input.getAttribute('aria-describedby')\n    if (ariaDescribedBy) {\n      $button.setAttribute('aria-describedby', ariaDescribedBy)\n    }\n\n    // Create status element that shows what/how many files are selected\n    const $status = document.createElement('span')\n    $status.className = 'govuk-body govuk-file-upload-button__status'\n    $status.setAttribute('aria-live', 'polite')\n    $status.innerText = this.i18n.t('noFileChosen')\n\n    $button.appendChild($status)\n\n    const commaSpan = document.createElement('span')\n    commaSpan.className = 'govuk-visually-hidden'\n    commaSpan.innerText = ', '\n    commaSpan.id = `${this.id}-comma`\n\n    $button.appendChild(commaSpan)\n\n    const containerSpan = document.createElement('span')\n    containerSpan.className =\n      'govuk-file-upload-button__pseudo-button-container'\n\n    const buttonSpan = document.createElement('span')\n    buttonSpan.className =\n      'govuk-button govuk-button--secondary govuk-file-upload-button__pseudo-button'\n    buttonSpan.innerText = this.i18n.t('chooseFilesButton')\n\n    containerSpan.appendChild(buttonSpan)\n\n    // Add a space so the button and instruction read correctly\n    // when CSS is disabled\n    containerSpan.insertAdjacentText('beforeend', ' ')\n\n    const instructionSpan = document.createElement('span')\n    instructionSpan.className =\n      'govuk-body govuk-file-upload-button__instruction'\n    instructionSpan.innerText = this.i18n.t('dropInstruction')\n\n    containerSpan.appendChild(instructionSpan)\n\n    $button.appendChild(containerSpan)\n    $button.setAttribute(\n      'aria-labelledby',\n      `${$label.id} ${commaSpan.id} ${$button.id}`\n    )\n    $button.addEventListener('click', this.onClick.bind(this))\n    $button.addEventListener('dragover', (event) => {\n      // prevent default to allow drop\n      event.preventDefault()\n    })\n\n    // Assemble these all together\n    this.$root.insertAdjacentElement('afterbegin', $button)\n\n    this.$input.setAttribute('tabindex', '-1')\n    this.$input.setAttribute('aria-hidden', 'true')\n\n    // Make all these new variables available to the module\n    this.$button = $button\n    this.$status = $status\n\n    // Bind change event to the underlying input\n    this.$input.addEventListener('change', this.onChange.bind(this))\n\n    // Synchronise the `disabled` state between the button and underlying input\n    this.updateDisabledState()\n    this.observeDisabledState()\n\n    // Handle drop zone visibility\n    // A live region to announce when users enter or leave the drop zone\n    this.$announcements = document.createElement('span')\n    this.$announcements.classList.add('govuk-file-upload-announcements')\n    this.$announcements.classList.add('govuk-visually-hidden')\n    this.$announcements.setAttribute('aria-live', 'assertive')\n    this.$root.insertAdjacentElement('afterend', this.$announcements)\n\n    // if there is no CSS and input is hidden\n    // button will need to handle drop event\n    this.$button.addEventListener('drop', this.onDrop.bind(this))\n\n    // While user is dragging, it gets a little more complex because of Safari.\n    // Safari doesn't fill `relatedTarget` on `dragleave` (nor `dragenter`).\n    // This means we can't use `relatedTarget` to:\n    // - check if the user is still within the wrapper\n    //   (`relatedTarget` being a descendant of the wrapper)\n    // - check if the user is still over the viewport\n    //   (`relatedTarget` being null if outside)\n\n    // Thanks to `dragenter` bubbling, we can listen on the `document` with a\n    // single function and update the visibility based on whether we entered a\n    // node inside or outside the wrapper.\n    document.addEventListener(\n      'dragenter',\n      this.updateDropzoneVisibility.bind(this)\n    )\n\n    // To detect if we're outside the document, we can track if there was a\n    // `dragenter` event preceding a `dragleave`. If there wasn't, this means\n    // we're outside the document.\n    //\n    // The order of events is guaranteed by the HTML specs:\n    // https://html.spec.whatwg.org/multipage/dnd.html#drag-and-drop-processing-model\n    document.addEventListener('dragenter', () => {\n      this.enteredAnotherElement = true\n    })\n\n    document.addEventListener('dragleave', () => {\n      if (!this.enteredAnotherElement && !this.$button.disabled) {\n        this.hideDraggingState()\n        this.$announcements.innerText = this.i18n.t('leftDropZone')\n      }\n\n      this.enteredAnotherElement = false\n    })\n  }\n\n  /**\n   * Updates the visibility of the dropzone as users enters the various elements on the page\n   *\n   * @private\n   * @param {DragEvent} event - The `dragenter` event\n   */\n  updateDropzoneVisibility(event) {\n    if (this.$button.disabled) return\n\n    // DOM interfaces only type `event.target` as `EventTarget`\n    // so we first need to make sure it's a `Node`\n    if (event.target instanceof Node) {\n      if (this.$root.contains(event.target)) {\n        if (event.dataTransfer && this.canDrop(event.dataTransfer)) {\n          // Only update the class and make the announcement if not already visible\n          // to avoid repeated announcements on NVDA (2024.4) + Firefox (133)\n          if (\n            !this.$button.classList.contains(\n              'govuk-file-upload-button--dragging'\n            )\n          ) {\n            this.showDraggingState()\n            this.$announcements.innerText = this.i18n.t('enteredDropZone')\n          }\n        }\n      } else {\n        // Only hide the dropzone if it is visible to prevent announcing user\n        // left the drop zone when they enter the page but haven't reached yet\n        // the file upload component\n        if (\n          this.$button.classList.contains('govuk-file-upload-button--dragging')\n        ) {\n          this.hideDraggingState()\n          this.$announcements.innerText = this.i18n.t('leftDropZone')\n        }\n      }\n    }\n  }\n\n  /**\n   * Show the drop zone visually\n   *\n   * @private\n   */\n  showDraggingState() {\n    this.$button.classList.add('govuk-file-upload-button--dragging')\n  }\n\n  /**\n   * Hides the drop zone visually\n   *\n   * @private\n   */\n  hideDraggingState() {\n    this.$button.classList.remove('govuk-file-upload-button--dragging')\n  }\n\n  /**\n   * Handles user dropping on the component\n   *\n   * @private\n   * @param {DragEvent} event - The `dragenter` event\n   */\n  onDrop(event) {\n    event.preventDefault()\n\n    if (event.dataTransfer && this.canFillInput(event.dataTransfer)) {\n      this.$input.files = event.dataTransfer.files\n\n      // Dispatch a `change` event so external code that would rely on the `<input>`\n      // dispatching an event when files are dropped still work.\n      // Use a `CustomEvent` so our events are distinguishable from browser's native events\n      this.$input.dispatchEvent(new CustomEvent('change'))\n\n      this.hideDraggingState()\n    }\n  }\n\n  /**\n   * Confirms if enhanced `<input>` can be filled with files from the given `DataTransfer`\n   *\n   * @param {DataTransfer} dataTransfer - The `DataTransfer` being dropped\n   * @returns {boolean} - true if the `DataTransfer` contains files, in number matching the `multiple` attribute of the original `<input>`\n   * @private\n   */\n  canFillInput(dataTransfer) {\n    return this.matchesInputCapacity(dataTransfer.files.length)\n  }\n\n  /**\n   * Confirms if the content of a `DataTransfer` dragged over component can be dropped\n   *\n   * Unfortunately, there's a certain level of uncertainty in Safari which does not\n   * even provide a list of `items` while dragging (and seems to even miss the `types` sometimes)\n   *\n   * @param {DataTransfer} dataTransfer - The `DataTransfer` being dragged\n   * @returns {boolean} - true if the `DataTransfer` looks OK for filling the input, false otherwise\n   * @private\n   */\n  canDrop(dataTransfer) {\n    // If the browser is kind enough to give a list of items, we'll use that as source of truth\n    if (dataTransfer.items.length) {\n      return this.matchesInputCapacity(countFileItems(dataTransfer.items))\n    }\n\n    // If we have some type information, we'll use that\n    if (dataTransfer.types.length) {\n      return dataTransfer.types.includes('Files')\n    }\n\n    // If we have nothing to go by, we'll assume things are OK\n    // until we have a more accurate picture inside the `drop` event\n    return true\n  }\n\n  /**\n   * Confirms the given number of files matches that allowed by the enhanced `<input>`\n   *\n   * @param {number} numberOfFiles - The number of files\n   * @returns {boolean} - `true` if the enhanced `<input>` can accept that number of files\n   * @private\n   */\n  matchesInputCapacity(numberOfFiles) {\n    if (this.$input.multiple) {\n      return numberOfFiles > 0\n    }\n\n    return numberOfFiles === 1\n  }\n\n  /**\n   * Check if the value of the underlying input has changed\n   *\n   * @private\n   */\n  onChange() {\n    const fileCount = this.$input.files.length\n\n    if (fileCount === 0) {\n      // If there are no files, show the default selection text\n      this.$status.innerText = this.i18n.t('noFileChosen')\n      this.$button.classList.add('govuk-file-upload-button--empty')\n    } else {\n      if (\n        // If there is 1 file, just show the file name\n        fileCount === 1\n      ) {\n        this.$status.innerText = this.$input.files[0].name\n      } else {\n        // Otherwise, tell the user how many files are selected\n        this.$status.innerText = this.i18n.t('multipleFilesChosen', {\n          count: fileCount\n        })\n      }\n\n      this.$button.classList.remove('govuk-file-upload-button--empty')\n    }\n  }\n\n  /**\n   * Looks up the `<label>` element associated to the field\n   *\n   * @private\n   * @returns {HTMLElement} The `<label>` element associated to the field\n   * @throws {ElementError} If the `<label>` cannot be found\n   */\n  findLabel() {\n    // Use `label` in the selector so TypeScript knows the type fo `HTMLElement`\n    const $label = document.querySelector(`label[for=\"${this.$input.id}\"]`)\n\n    if (!$label) {\n      throw new ElementError({\n        component: FileUpload,\n        identifier: `Field label (\\`<label for=${this.$input.id}>\\`)`\n      })\n    }\n\n    return $label\n  }\n\n  /**\n   * When the button is clicked, emulate clicking the actual, hidden file input\n   *\n   * @private\n   */\n  onClick() {\n    this.$input.click()\n  }\n\n  /**\n   * Create a mutation observer to check if the input's attributes altered.\n   *\n   * @private\n   */\n  observeDisabledState() {\n    const observer = new MutationObserver((mutationList) => {\n      for (const mutation of mutationList) {\n        if (\n          mutation.type === 'attributes' &&\n          mutation.attributeName === 'disabled'\n        ) {\n          this.updateDisabledState()\n        }\n      }\n    })\n\n    observer.observe(this.$input, {\n      attributes: true\n    })\n  }\n\n  /**\n   * Synchronise the `disabled` state between the input and replacement button.\n   *\n   * @private\n   */\n  updateDisabledState() {\n    this.$button.disabled = this.$input.disabled\n\n    this.$root.classList.toggle(\n      'govuk-drop-zone--disabled',\n      this.$button.disabled\n    )\n  }\n\n  /**\n   * Name for the component used when initialising using data-module attributes.\n   */\n  static moduleName = 'govuk-file-upload'\n\n  /**\n   * File upload default config\n   *\n   * @see {@link FileUploadConfig}\n   * @constant\n   * @type {FileUploadConfig}\n   */\n  static defaults = Object.freeze({\n    i18n: {\n      chooseFilesButton: 'Choose file',\n      dropInstruction: 'or drop file',\n      noFileChosen: 'No file chosen',\n      multipleFilesChosen: {\n        // the 'one' string isn't used as the component displays the filename\n        // instead, however it's here for coverage's sake\n        one: '%{count} file chosen',\n        other: '%{count} files chosen'\n      },\n      enteredDropZone: 'Entered drop zone',\n      leftDropZone: 'Left drop zone'\n    }\n  })\n\n  /**\n   * File upload config schema\n   *\n   * @constant\n   * @satisfies {Schema<FileUploadConfig>}\n   */\n  static schema = Object.freeze({\n    properties: {\n      i18n: { type: 'object' }\n    }\n  })\n}\n\n/**\n * Counts the number of `DataTransferItem` whose kind is `file`\n *\n * @param {DataTransferItemList} list - The list\n * @returns {number} - The number of items whose kind is `file` in the list\n */\nfunction countFileItems(list) {\n  let result = 0\n\n  // `DataTransferItemList` is not iterable\n  // eslint-disable-next-line @typescript-eslint/prefer-for-of\n  for (let i = 0; i < list.length; i++) {\n    if (list[i].kind === 'file') {\n      result++\n    }\n  }\n  return result\n}\n\n/**\n * @typedef {HTMLInputElement & {files: FileList}} HTMLFileInputElement\n */\n\n/**\n * File upload config\n *\n * @see {@link FileUpload.defaults}\n * @typedef {object} FileUploadConfig\n * @property {FileUploadTranslations} [i18n=FileUpload.defaults.i18n] - File upload translations\n */\n\n/**\n * File upload translations\n *\n * @see {@link FileUpload.defaults.i18n}\n * @typedef {object} FileUploadTranslations\n *\n * Messages used by the component\n * @property {string} [chooseFile] - The text of the button that opens the file picker\n * @property {string} [dropInstruction] - The text informing users they can drop files\n * @property {TranslationPluralForms} [multipleFilesChosen] - The text displayed when multiple files\n *   have been chosen by the user\n * @property {string} [noFileChosen] - The text to displayed when no file has been chosen by the user\n * @property {string} [enteredDropZone] - The text announced by assistive technology\n *   when user drags files and enters the drop zone\n * @property {string} [leftDropZone] - The text announced by assistive technology\n *   when user drags files and leaves the drop zone without dropping\n */\n\n/**\n * @import { Schema } from '../../common/configuration.mjs'\n * @import { TranslationPluralForms } from '../../i18n.mjs'\n 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