c2n/web-componentsv0.0.16
ComponentsIconsGuidesExamplesGetting started
ComponentsIconsGuidesExamplesGetting started
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Upload

Drag-and-drop file selection with validation, upload progress, retry, cancellation, and attachment results.

Attributes

NameTypeDefaultDescription
multiplebooleanfalseAccept several files in one browse or drop operation.
variantUploadVariantdropzoneDropzone provides drag-and-drop; compact renders only an upload button.
acceptstring—Comma-separated MIME types or file extensions, using the native file-input syntax.
max-filesnumber0Maximum number of queued files. Zero means unlimited.
max-sizenumber0Maximum size of each file in bytes. Zero means unlimited.
auto-uploadbooleantrueRun uploadHandler immediately after files are accepted.
disabledbooleanfalseDisables browsing, dropping and attachment actions.
requiredbooleanfalseRequires at least one selected file for native form validation.
namestring—Form field name. Each queued file is appended with this name.
aria-labelstring | nullnullAccessible name for the drop zone.

Slots

NameDescription
drop-iconReplaces the upload-cloud icon in the drop zone.
promptReplaces the main drop-zone instruction.
hintReplaces the accepted-type and size hint.
actionReplaces the dynamic label of the compact upload button.
emptyOptional content shown below the drop zone while no files are selected.

Events

NameTypeDescription
inputEventFired whenever the file value changes, for form and framework bindings.
changeEventFired whenever files are added or removed, for form and framework bindings.
files-selectedCustomEvent<UploadFilesEventDetail>Fired after valid files enter the queue through browse, drop or addFiles().
file-rejectCustomEvent<{ rejections: UploadRejection[] }>Fired when type, size, count or single-file rules reject files.
upload-startCustomEvent<{ item: UploadItem }>Fired when an item begins uploading.
upload-progressCustomEvent<UploadProgressEventDetail>Fired when the upload handler reports progress.
upload-successCustomEvent<UploadResultEventDetail>Fired after an upload handler resolves; item.result contains its result.
upload-errorCustomEvent<UploadResultEventDetail>Fired after an upload handler rejects; item.error contains the error.
upload-removeCustomEvent<{ item: UploadItem }>Fired after an item is removed or an active upload is cancelled.

CSS parts

Shadow DOM styling hooks used with ::part(name). Prefer CSS custom properties when they cover the change.

NameDescription
dropzoneInteractive drop-zone region containing the icon, prompt, and hint.
drop-iconIcon boundary wrapping the drop-icon slot and fallback icon.
promptInstruction region wrapping the prompt slot and fallback prompt.
hintSupporting-text region wrapping the hint slot and generated fallback hint.
actionCompact picker label boundary wrapping the action slot and fallback label.
emptyEmpty-state boundary exposing the empty slot.
errorsValidation-error status region.
listSelected-file list region.

CSS custom properties

Grouped by semantic target and state from --c2-component__target__state--property. Click a group to collapse it; click a name to copy it.

NameTypeDefaultDescription
c2-upload
--c2-upload--widthpixel420px
c2-upload > dropzone
--c2-upload__dropzone--paddingpadding28px 20px
--c2-upload__dropzone--gappixel8px
--c2-upload__dropzone--backgroundcolor#ffffff
--c2-upload__dropzone--borderborder1px dashed #bcbcc6
--c2-upload__dropzone--border-radiusborder-radius14px
c2-upload > dropzone > hover
--c2-upload__dropzone__hover--backgroundcolor#fafafa
--c2-upload__dropzone__hover--borderborder1px dashed #a1a1aa
c2-upload > dropzone > drag
--c2-upload__dropzone__drag--backgroundcolor#e8f2ff
--c2-upload__dropzone__drag--borderborder1px dashed rgb(2, 101, 220)
c2-upload > dropzone > focus
--c2-upload__dropzone__focus--outlineoutline2px solid rgba(2, 101, 220, 0.4)
--c2-upload__dropzone__focus--outline-offsetpixel2px
c2-upload > dropzone > disabled
--c2-upload__dropzone__disabled--opacityopacity0.38
c2-upload > icon
--c2-upload__icon--sizepixel32px
--c2-upload__icon--colorcolorrgb(2, 101, 220)
c2-upload > prompt
--c2-upload__prompt--colorcolor#18181b
--c2-upload__prompt--font-sizefont-size14px
--c2-upload__prompt--font-weightfont-weight600
c2-upload > action
--c2-upload__action--colorcolorrgb(2, 101, 220)
c2-upload > hint
--c2-upload__hint--colorcolor#71717a
--c2-upload__hint--font-sizefont-size12px
c2-upload > list
--c2-upload__list--gappixel10px
--c2-upload__list--margin-toppixel12px
c2-upload > error
--c2-upload__error--colorcolor#dc2626
--c2-upload__error--font-sizefont-size12px
--c2-upload__error--gappixel4px
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