Created
February 6, 2023 20:30
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Manual Multiple File Direct Upload
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import { DirectUpload } from '../rails/activestorage' | |
export default class { | |
constructor (input) { | |
this.input = input | |
this.submit = input.form.querySelector('.btn-submit') // The submit button. We show loading progress here | |
this.progress = this.submit.querySelector('.btn-submit-progress') // The progress bar inside the submit | |
this.loader = this.submit.querySelector('.btn-submit-loader') // The loader animation inside the submit | |
this.totalSize = 0 | |
this.loaded = {} | |
} | |
upload () { | |
// For each file that needs to be uploaded, create a promise | |
const promises = Array.from(this.input.files).map(file => { | |
return new Promise((resolve, reject) => { | |
const url = this.input.dataset.directUploadUrl | |
this.submit.classList.add('btn-submit-uploading') | |
this.totalSize += file.size | |
this.directUpload(this.submit, this.input, file, url, resolve, reject, this) | |
}).catch(() => { | |
// Do nothing. Yes nothing, I just want Sentry to shut up. | |
}) | |
}) | |
// Wait until all promises are done before returning controle to the JS library | |
return Promise.allSettled(promises).catch(() => { | |
// Do nothing. Yes nothing, I just want Sentry to shut up. | |
}) | |
} | |
// The code that actually handles the direct upload. Notice that each file is given a hidden input field with its signed_id | |
directUpload (submit, input, file, url, resolve, reject, caller) { | |
new DirectUpload(file, url, caller).create((error, blob) => { | |
if (error) { | |
submit.classList.remove('btn-submit-uploading') | |
reject(error) | |
} else { | |
const hiddenField = document.createElement('input') | |
hiddenField.setAttribute('type', 'hidden') | |
hiddenField.setAttribute('value', blob.signed_id) | |
hiddenField.name = input.name | |
input.form.appendChild(hiddenField) | |
resolve('Upload done') | |
} | |
}) | |
} | |
// Callback that indicates that direct upload is beginning | |
directUploadWillStoreFileWithXHR (request) { | |
request.upload.addEventListener('progress', | |
event => this.directUploadDidProgress(event)) | |
} | |
// Callback that direct upload is in progress | |
directUploadDidProgress (event) { | |
this.loaded[event.total] = event.loaded // No ids, so let's do something fugly and use the file size as the id | |
const totalLoaded = Object.values(this.loaded).reduce((sum, x) => sum + x) | |
this.progress.style.width = `${totalLoaded / this.totalSize * 100}%` | |
} | |
} |
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