FileDrop

A file dropzone action & component for Svelte.

Install

npm i filedrop-svelte -D

# yarn add filedrop-svelte -dev

If using Typescript, see the Typescript section.

Usage

filedrop-svelte comes with both a component and an action. The component is basically a wrapper around the action with some some default styling.

Component

See this REPL for minmimal usage.

<script>
	import FileDrop from "filedrop-svelte";
	import type { Files } from "filedrop-svelte";
	import fileSize from "filesize";
	let files: Files;
</script>

<FileDrop on:filedrop={(e) => { files = e.detail.files }}>
        Upload files
</FileDrop>

{#if files}
	<h3>Accepted files</h3>
	<ul>
		{#each files.accepted as file}
			<li>{file.name} - {fileSize(file.size)}</li>
		{/each}
	</ul>
	<h3>Rejected files</h3>
	<ul>
		{#each files.rejected as rejected}
			<li>{rejected.file.name} - {rejected.error.message}</li>
		{/each}
	</ul>
{/if}

Action

See this REPL for minimal usage.

<script>
	import { filedrop } from "filedrop-svelte";
	import type { Files, FileDropOptions } from "filedrop-svelte";
	let options: FileDropOptions = {};
	let files: Files;
</script>

<div use:filedrop={options} on:filedrop={(e) => {files = e.detail.files}}>
	<!-- you can add your input[type="file"] here if you want.
	or you can omit it and it'll be appended -->
	Drag &amp; drop files
	{files}
</div>

Reference

Options

parameter	purpose	type	default
accept	specify file types to accept. See HTML attribute: accept on MDN Web Docs for more information.	string string[]	undefined
maxSize	the maximum size a file can be in bytes.	number	undefined
minSize	the minimum size a file can be in bytes.	number	undefined
fileLimit	total number of files allowed in a transaction. A value of 0 disables the action/component, 1 turns multiple off, and any other value enables multiple. Any attempt to upload more files than allowed will result in the files being placed in rejections	numer	undefined
multiple	sets the file input to multiple. See HTML attribute: multiple on MDN Web Docs for more information.	boolean	true
disabled	disables the action/component, removing all event listeners	boolean	false
windowDrop	determines whether or not files can be dropped anywhere in the window. A value of false would require that the files be droppped within the <FileDrop> component or the element with use:filedrop.	boolean	true
clickToUpload	causes the containing element to be treated as the input. If hideInput is true or undefined, disabling this does not change the tabindex of the container or remove the keydown eventListener	boolean	true
tabIndex	tab index of the container. if disabled is true then this is set to -1. If clickToUpload is true or undefined, this defaults to 0.	number	0
hideInput	if true or undefined, input[type='file'] will be set to display:none	boolean	true
input	allows you to explicitly pass a reference to the file HTMLInputElement as a parameter. If undefined, the action will search for input[type="file"]. If one is not found, it will be appeneded to the element with use:filedrop	HTMLInputElement	undefined

Events

event	description	event.detail
filedrop	one or more files has been selected in the file dialog or drag-and-dropped	FileDropSelectEvent
filedragenter	a dragenter event has occurred on the container element containnig one or more files	FileDropDragEvent
filedragleave	a dragleave event has occurred on the container element containing one or more files	FileDropDragEvent
filedragover	a dragover event has occurred on the container element containing one or more files	FileDropDragEvent
filedialogcancel	the file dialog has been canceled without selecting files	FileDropEvent
filedialogclose	the file dialog has been closed with files selected	FileDropEvent
filedialogopen	the file dialog has been opened	FileDropEvent
windowfiledragenter	a dragenter event has occurred on the document (event is named windowfiledragenter so not to confuse document with file)	FileDropDragEvent
windowfiledragleave	a dragleave event has occurred on the document (event is named windowfiledragleave so not to confuse document with file)	FileDropDragEvent
windowfiledragover	a dragover event has occurred on the document (event is named windowfiledragover so not to confuse document with file)	FileDropDragEvent

Errors

class	reason	code
InvalidFileTypeError	file type does not satisfy accept	InvalidFileType (0)
FileCountExceededError	total number of files selected or dropped exceeds fileLimit	FileCountExceeded (1)
FileSizeMinimumNotMetError	file does not satisify minSize	FileSizeMinimumNotMet (2)
FileSizeMaximumExceededError	file does not satisify maxSize	FileSizeMaximumExceeded (3)

Typescript

In order for typings to work properly, you'll need to add the following to global.d.ts until this issue is resolved:

declare type FileDropEvent = import("filedrop-svelte/event").FileDropEvent;
declare type FileDropSelectEvent = import("filedrop-svelte/event").FileDropSelectEvent;
declare type FileDropDragEvent = import("filedrop-svelte/event").FileDropDragEvent;
declare namespace svelte.JSX {
    interface HTMLAttributes<T> {
        onfiledrop?: (event: CustomEvent<FileDropSelectEvent> & { target: EventTarget & T }) => void;
        onfiledragenter?: (event: CustomEvent<FileDropDragEvent> & { target: EventTarget & T }) => void;
        onfiledragleave?: (event: CustomEvent<FileDropDragEvent> & { target: EventTarget & T }) => void;
        onfiledragover?: (event: CustomEvent<FileDropDragEvent> & { target: EventTarget & T }) => void;
        onfiledialogcancel?: (event: CustomEvent<FileDropEvent> & { target: EventTarget & T }) => void;
        onfiledialogclose?: (event: CustomEvent<FileDropEvent> & { target: EventTarget & T }) => void;
        onfiledialogopen?: (event: CustomEvent<FileDropEvent> & { target: EventTarget & T }) => void;
        onwindowfiledragenter?: (event: CustomEvent<FileDropDragEvent> & { target: EventTarget & T }) => void;
        onwindowfiledragleave?: (event: CustomEvent<FileDropDragEvent> & { target: EventTarget & T }) => void;
        onwindowfiledragover?: (event: CustomEvent<FileDropDragEvent> & { target: EventTarget & T }) => void;
    }
}

You may need to edit tsconfig.json to include global.d.ts if it isn't already.

Alternatives

• svelte-file-dropzone

Previous art

• react-dropzone
• svelte-file-dropzone

Dependencies

• file-selector

Todo

• tests
• better documentation
• demo website

License

MIT