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[WIP] Spike progressively enhanced file upload
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229 changes: 229 additions & 0 deletions
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packages/govuk-frontend/src/govuk/components/file-upload/file-upload.mjs
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,229 @@ | ||
| import { closestAttributeValue } from '../../common/closest-attribute-value.mjs' | ||
| import { mergeConfigs } from '../../common/index.mjs' | ||
| import { normaliseDataset } from '../../common/normalise-dataset.mjs' | ||
| import { ElementError } from '../../errors/index.mjs' | ||
| import { GOVUKFrontendComponent } from '../../govuk-frontend-component.mjs' | ||
| import { I18n } from '../../i18n.mjs' | ||
|
|
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| /** | ||
| * File upload component | ||
| * | ||
| * @preserve | ||
| */ | ||
| export class FileUpload extends GOVUKFrontendComponent { | ||
| /** | ||
| * @private | ||
| * @type {HTMLInputElement} | ||
| */ | ||
| $input | ||
|
|
||
| /** | ||
| * @private | ||
| * @type {HTMLElement} | ||
| */ | ||
| $wrapper | ||
|
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||
| /** | ||
| * @private | ||
| * @type {HTMLButtonElement} | ||
| */ | ||
| $button | ||
|
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||
| /** | ||
| * @private | ||
| * @type {HTMLElement} | ||
| */ | ||
| $status | ||
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||
| /** | ||
| * @private | ||
| * @type {FileUploadConfig} | ||
| */ | ||
| config | ||
|
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| /** @private */ | ||
| i18n | ||
|
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| /** | ||
| * @param {Element | null} $input - File input element | ||
| * @param {FileUploadConfig} [config] - File Upload config | ||
| */ | ||
| constructor($input, config = {}) { | ||
| super() | ||
|
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| if (!($input instanceof HTMLInputElement)) { | ||
| throw new ElementError({ | ||
| componentName: 'File upload', | ||
| element: $input, | ||
| expectedType: 'HTMLInputElement', | ||
| identifier: 'Root element (`$module`)' | ||
| }) | ||
| } | ||
|
|
||
| if ($input.type !== 'file') { | ||
| throw new ElementError('File upload: Form field must be of type `file`.') | ||
| } | ||
|
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||
| this.config = mergeConfigs( | ||
| FileUpload.defaults, | ||
| config, | ||
| normaliseDataset(FileUpload, $input.dataset) | ||
| ) | ||
|
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||
| this.i18n = new I18n(this.config.i18n, { | ||
| // Read the fallback if necessary rather than have it set in the defaults | ||
| locale: closestAttributeValue($input, 'lang') | ||
| }) | ||
|
|
||
| $input.addEventListener('change', this.onChange.bind(this)) | ||
| this.$input = $input | ||
|
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| // Wrapping element. This defines the boundaries of our drag and drop area. | ||
| const $wrapper = document.createElement('div') | ||
| $wrapper.className = 'govuk-file-upload-wrapper' | ||
| $wrapper.addEventListener('dragover', this.onDragOver.bind(this)) | ||
| $wrapper.addEventListener('dragleave', this.onDragLeaveOrDrop.bind(this)) | ||
| $wrapper.addEventListener('drop', this.onDragLeaveOrDrop.bind(this)) | ||
|
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| // Create the file selection button | ||
| const $button = document.createElement('button') | ||
| $button.className = | ||
| 'govuk-button govuk-button--secondary govuk-file-upload__button' | ||
| $button.type = 'button' | ||
| $button.innerText = this.i18n.t('selectFilesButton') | ||
| $button.addEventListener('click', this.onClick.bind(this)) | ||
|
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| // Create status element that shows what/how many files are selected | ||
| const $status = document.createElement('span') | ||
| $status.className = 'govuk-body govuk-file-upload__status' | ||
| $status.innerText = this.i18n.t('filesSelectedDefault') | ||
| $status.setAttribute('role', 'status') | ||
|
|
||
| // Assemble these all together | ||
| $wrapper.insertAdjacentElement('beforeend', $button) | ||
| $wrapper.insertAdjacentElement('beforeend', $status) | ||
|
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| // Inject all this *after* the native file input | ||
| this.$input.insertAdjacentElement('afterend', $wrapper) | ||
|
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| // Move the native file input to inside of the wrapper | ||
| $wrapper.insertAdjacentElement('afterbegin', this.$input) | ||
|
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||
| // Make all these new variables available to the module | ||
| this.$wrapper = $wrapper | ||
| this.$button = $button | ||
| this.$status = $status | ||
|
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||
| // Bind change event to the underlying input | ||
| this.$input.addEventListener('change', this.onChange.bind(this)) | ||
| } | ||
|
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||
| /** | ||
| * Check if the value of the underlying input has changed | ||
| */ | ||
| onChange() { | ||
| if (!this.$input.files) { | ||
| return | ||
| } | ||
|
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| const fileCount = this.$input.files.length | ||
|
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| if (fileCount === 0) { | ||
| // If there are no files, show the default selection text | ||
| this.$status.innerText = this.i18n.t('filesSelectedDefault') | ||
| } else if ( | ||
| // If there is 1 file, just show the file name | ||
| fileCount === 1 | ||
| ) { | ||
| this.$status.innerText = this.$input.files[0].name | ||
| } else { | ||
| // Otherwise, tell the user how many files are selected | ||
| this.$status.innerText = this.i18n.t('filesSelected', { | ||
| count: fileCount | ||
| }) | ||
| } | ||
| } | ||
|
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||
| /** | ||
| * When the button is clicked, emulate clicking the actual, hidden file input | ||
| */ | ||
| onClick() { | ||
| this.$input.click() | ||
| } | ||
|
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||
| /** | ||
| * When a file is dragged over the container, show a visual indicator that a | ||
| * file can be dropped here. | ||
| */ | ||
| onDragOver() { | ||
| this.$wrapper.classList.add('govuk-file-upload-wrapper--show-dropzone') | ||
| } | ||
|
|
||
| /** | ||
| * When a dragged file leaves the container, or the file is dropped, | ||
| * remove the visual indicator. | ||
| */ | ||
| onDragLeaveOrDrop() { | ||
| this.$wrapper.classList.remove('govuk-file-upload-wrapper--show-dropzone') | ||
| } | ||
|
|
||
| /** | ||
| * Name for the component used when initialising using data-module attributes. | ||
| */ | ||
| static moduleName = 'govuk-file-upload' | ||
|
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| /** | ||
| * File upload default config | ||
| * | ||
| * @see {@link FileUploadConfig} | ||
| * @constant | ||
| * @type {FileUploadConfig} | ||
| */ | ||
| static defaults = Object.freeze({ | ||
| i18n: { | ||
| selectFilesButton: 'Choose file', | ||
| filesSelectedDefault: 'No file chosen', | ||
| filesSelected: { | ||
| one: '%{count} file chosen', | ||
| other: '%{count} files chosen' | ||
| } | ||
| } | ||
| }) | ||
|
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| /** | ||
| * File upload config schema | ||
| * | ||
| * @constant | ||
| * @satisfies {Schema} | ||
| */ | ||
| static schema = Object.freeze({ | ||
| properties: { | ||
| i18n: { type: 'object' } | ||
| } | ||
| }) | ||
| } | ||
|
|
||
| /** | ||
| * File upload config | ||
| * | ||
| * @see {@link FileUpload.defaults} | ||
| * @typedef {object} FileUploadConfig | ||
| * @property {FileUploadTranslations} [i18n=FileUpload.defaults.i18n] - File upload translations | ||
| */ | ||
|
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| /** | ||
| * File upload translations | ||
| * | ||
| * @see {@link FileUpload.defaults.i18n} | ||
| * @typedef {object} FileUploadTranslations | ||
| * | ||
| * Messages used by the component | ||
| * @property {string} [selectFiles] - Text of button that opens file browser | ||
| * @property {TranslationPluralForms} [filesSelected] - Text indicating how | ||
| * many files have been selected | ||
| */ | ||
|
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| /** | ||
| * @typedef {import('../../common/index.mjs').Schema} Schema | ||
| * @typedef {import('../../i18n.mjs').TranslationPluralForms} TranslationPluralForms | ||
| */ |
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