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94 lines
4.4 KiB
Plaintext
94 lines
4.4 KiB
Plaintext
---
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title: Dropzone
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summary: Dropzone adds drag-and-drop file uploads to a form, with previews and progress bars styled by Tabler.
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description: Add drag-and-drop file uploads to your forms with the Dropzone library, styled to match Tabler out of the box.
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docs-libs: [dropzone]
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related: [/ui/forms/elements]
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---
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import Example from '@components/Example.astro';
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import CdnImportPlugin from '@components/CdnImportPlugin.astro';
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import TabsPackage from '@components/TabsPackage.astro';
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import { Code } from 'astro:components';
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import { site } from '@shared/lib/site.ts';
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## Overview
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A dropzone is a form users can drop files onto instead of picking them through a file dialog. It is built with the [Dropzone](https://www.dropzone.dev/) library, which handles the drag events, the previews and the upload.
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Tabler styles the drop area, the file previews and the progress bars, so a dropzone matches the rest of your forms without extra CSS.
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## Installation
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Install Dropzone with npm:
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<TabsPackage name="dropzone" />
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Or include it from a CDN:
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<Code lang="html" code={`<link rel="stylesheet" href="${site.cdnUrl}/dist/libs/dropzone/dist/dropzone.css" />\n<script src="${site.cdnUrl}/dist/libs/dropzone/dist/dropzone-min.js"></script>`} />
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Tabler restyles the drop area in the vendors plugin, so include `tabler-vendors.css` as well:
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<CdnImportPlugin plugins={['vendors']} />
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## Basic usage
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The basic setup is a `form` with the `dropzone` class. The `.fallback` element holds a normal file input for browsers without drag and drop support:
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```html
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<form class="dropzone" id="dropzone-default" action="." autocomplete="off" novalidate>
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<div class="fallback">
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<input name="file" type="file" />
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</div>
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</form>
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```
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Then create a `Dropzone` instance for the form:
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```html
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<script>
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{
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`document.addEventListener("DOMContentLoaded", function () {
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new Dropzone("#dropzone-default");
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});`;
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}
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</script>
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```
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From now on a file dropped on the form is uploaded right away, to the URL in the form's `action` attribute.
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<Example>
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<form class="dropzone" id="dropzone-default" action="." autocomplete="off" novalidate> <div class="fallback"> <input name="..." type="file" /> </div> </form> <script>{`document.addEventListener("DOMContentLoaded", function () { new Dropzone("#dropzone-default"); });`}</script>
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</Example>
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## Add multiple files
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Add the `multiple` attribute to the input to accept several files at once, for example for a gallery upload:
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```html
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<input name="..." type="file" multiple />
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```
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<Example>
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<form class="dropzone" id="dropzone-mulitple" action="." autocomplete="off" novalidate> <div class="fallback"> <input name="file" type="file" multiple /> </div> </form> <script>{`document.addEventListener("DOMContentLoaded", function () { new Dropzone("#dropzone-mulitple"); });`}</script>
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</Example>
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## Custom dropzone
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You can replace the default message in the drop area with your own markup, for example an icon and a hint about the accepted file types:
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<Example>
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<form class="dropzone" id="dropzone-custom" action="." autocomplete="off" novalidate> <div class="fallback"> <input name="file" type="file" /> </div> <div class="dz-message"> <h3>Your text here</h3> <span>Your custom description here</span> <button type="button" class="btn btn-sm mt-3">Select files</button> </div> </form> <script>{`document.addEventListener("DOMContentLoaded", function () { new Dropzone("#dropzone-custom"); });`}</script>
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</Example>
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Custom content replaces the button Dropzone renders by default, and that button is the only part of the drop area a keyboard can reach. Keep a focusable control - such as the one above - inside your own message.
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## Accessibility
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A drop area is only usable with a mouse, so the file input behind it does the real work.
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- Dropzone removes the `.fallback` input as soon as the browser supports drag and drop, so it is a fallback for old browsers, not the keyboard path. Keep it anyway - it costs nothing and covers that case.
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- Keyboard users reach the drop area through the `button` Dropzone renders inside `.dz-message`. If you replace that message with your own markup, put a focusable button back, or the area becomes mouse-only.
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- Say which files are accepted and how large they can be, in text next to the field rather than only in the plugin options.
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- Report upload progress and errors in text as well. A red border on a thumbnail is invisible to a screen reader - Dropzone's `error` event is the place to add a message.
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