isprambiente/medplan

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app/javascript/direct_upload.js

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import { DirectUpload } from "@rails/activestorage"
 
const input = document.querySelector('input[type=file]')
 
// Bind to file drop - use the ondrop on a parent element or use a
// library like Dropzone
const onDrop = (event) => {
event.preventDefault()
const files = event.dataTransfer.files;
Array.from(files).forEach(file => uploadFile(file))
}
 
// Bind to normal file selection
input.addEventListener('change', (event) => {
Array.from(input.files).forEach(file => uploadFile(file))
// you might clear the selected files from the input
input.value = null
})
 
const uploadFile = (file) => {
// your form needs the file_field direct_upload: true, which
// provides data-direct-upload-url
const url = input.dataset.directUploadUrl
const upload = new DirectUpload(file, url)
 
upload.create((error, blob) => {
if (error) {
// Handle the error
} else {
// Add an appropriately-named hidden input to the form with a
// value of blob.signed_id so that the blob ids will be
// transmitted in the normal upload flow
const hiddenField = document.createElement('input')
hiddenField.setAttribute("type", "hidden");
hiddenField.setAttribute("value", blob.signed_id);
hiddenField.name = input.name
document.querySelector('form').appendChild(hiddenField)
}
})
}