A javascript library to give file dropping super-powers to any HTML element.

Table of Contents

• Motivation
• Features
• Usecases
• Demo
• Basic usage
• Browser Compatibility
• Installation
  • npm
  • Scripts
• Advanced usage
  • Create a droppable element
  • Listen for dropped files
  • Remove listener for dropped files
  • Get the latest dropped files
  • Trigger prompt for files
  • Enable prompt for files when clicked
  • Disable prompt for files when clicked
  • Enable multiple files drop
  • Disable multiple files drop
  • Enable append CSS class when files are dragged on element
  • Disable append CSS class when files are dragged on element
  • Destroy
• FAQ
  • My droppable element has a border around it when focused
  • I want to add a style to my droppable element when focused
• Development
  • Clone the repository

Motivation

Wouldn't it be great if you could drop files in any HTML element?

Well now you can! 🎉

Features

• Restrict drop to single or multiple files
• CSS class added when files are being dragged on top of the HTML element (configurable)
• Clicking on the html element also prompts user for files (configurable)
• Zero dependencies
• Tiny! (~4 KB Minified)
• Accessibility support

Usecases

When files get dropped or selected into your element you will retrieve them as File objects. This means you can do anything you want with the dropped/selected files!

Here are some concrete usecases.

• Upload the files (e.g. chat media/attachment, file chunking, file sharing)
• Edit the files (e.g. Text editor, image editor)
• Inspect the files (e.g. syntax validator, file stats)
• Encrypt the files (Yes you can)

Demo

You can see the library in action here.

Basic usage

const Droppable = require('droppable');

const droppable = new Droppable({
    element: document.querySelector('#my-droppable-element')
})

droppable.onFilesDropped((files) => {
    console.log('Files were dropped:', files);
});

// Clean up when you're done!
droppable.destroy();

Browser Compatibility

✔	✔	10+ ✔	✔	✔	✔

Installation

npm

npm install droppable

Scripts

The library is also available as a standalone script in multiple formats (UMD, ES5, ES6 ...).

You can get the latest version from /dist or the stable one from the releases page.

Advanced usage

Create a droppable element

const Droppable = require('droppable');

const droppable = new Droppable({
    element: document.querySelector('#my-droppable-element')
});

Listen for dropped files

droppable.onFilesDropped((files) => {
    console.log('Files were dropped:', files);
});

Remove listener for dropped files

onFilesDropped returns a function which when called removes the event listener

const eventRemover = droppable.onFilesDropped((files) => {
    console.log('Files were dropped on the element:', files);
});

eventRemover();

Get the latest dropped files

const latestDroppedFiles = droppable.getLatestDroppedFiles();

Trigger prompt for files

Sometimes you will want to prompt the users for files without them dropping files or clicking the element.

droppable.promptForFiles();

Enable prompt for files when clicked

This is by default true

The user will be prompted for files when the droppable element is clicked

// On instantiation
const droppable = new Droppable({
    element,
    isClickable: true
})

// On runtime
droppable.setIsClickable(true);

Disable prompt for files when clicked

The user won't be prompted for files when the droppable element is clicked

// On instantiation
const droppable = new Droppable({
    element,
    isClickable: false
})

// On runtime
droppable.setIsClickable(false);

Enable multiple files drop

This is by default true

The user will be able to drop or select multiple files.

// On instantiation
const droppable = new Droppable({
    element,
    acceptsMultipleFiles: true
})

// On runtime
droppable.setAcceptsMultipleFiles(true);

Disable multiple files drop

The user will be able to drop or select one single file.

// On instantiation
const droppable = new Droppable({
    element,
    acceptsMultipleFiles: false
})

// On runtime
droppable.setAcceptsMultipleFiles(false);

Enable append CSS class when files are dragged on element

This is by default true

The class dragover will be added to the droppable element when files are being dragged on it.

// On instantiation
const droppable = new Droppable({
    element,
    appendStatusClasses: true
})

// On runtime
droppable.setAppendStatusClasses(true);

Disable append CSS class when files are dragged on element

The class dragover won't be added to the droppable element when files are being dragged on it.

// On instantiation
const droppable = new Droppable({
    element,
    appendStatusClasses: false
})

// On runtime
droppable.setAppendStatusClasses(false);

Destroy

The library attaches several events to the HTML element made droppable. The destroy function not only removes all of them but also the onFilesDropped listeners.

droppable.destroy();

FAQ

My droppable element has a border around it when focused

The library makes the droppable elements accesible, this means that they can get focused by the user.

Your browser by default adds an outline to the focused items. To remove it, in your css:

    #your-droppable-item:focus{
        outline: 0;
    }

I want to add a style to my droppable element when focused

In your css:

    #your-droppable-item:focus:not(:active){
        // Here you can do anything! For example adding a shadow
        box-shadow: 0 0 0 0.125em rgba(111, 14, 217, 0.25);
    }

Development

Clone the repository

git clone git@github.com:lifenautjoe/droppable.git

Use npm commands

• npm t: Run test suite
• npm start: Runs npm run build in watch mode
• npm run test:watch: Run test suite in interactive watch mode
• npm run test:prod: Run linting and generate coverage
• npm run build: Generate bundles and typings, create docs
• npm run lint: Lints code
• npm run commit: Commit using conventional commit style (husky will tell you to use it if you haven't 😉)

Author Joel Hernandez