The Uploader is the processing and queuing engine for React-Uploady, written in vanilla javascript. When files are handed to the Uploader, it will represent each file as a Batch Item and group them together in Batches. This is for the most part internal to the uploading mechanism.
The Uploader fires Batch & BatchItem lifecycle events that can be registered to. Some of these events also allow to cancel uploads dynamically.
If you're building a React app and want to add file-upload capabilities, you'd probably want to head over to the @rpldy/uploady README.
The best place to get started is at our: React-Uploady Documentation Website
#Yarn:
$ yarn add @rpldy/uploader
#NPM:
$ npm i @rpldy/uploaderWhen in React, you don't need to use this package directly. Uploady will take care of initialization and other aspects (ie: event registration) for you. In case you want to create your own uploader instance, you can do it like so:
import createUploader, { UPLOADER_EVENTS } from "@rpldy/uploader";
const uploader = createUploader({
autoUpload: false,
grouped: true,
//...
});
uploader.on(UPLOADER_EVENTS.ITEM_START, (item) => {
console.log(`item ${item.id} started uploading`);
});
uploader.add(myFile);| Name (* = mandatory) | Type | Default | Description |
|---|---|---|---|
| autoUpload | boolean | true | automatically upload files when they are added |
| destination | Destination | undefined | configure the end-point to upload to |
| inputFieldName | string | "file" | name (attribute) of the file input field (requires sendWithFormData = true) |
| grouped | boolean | false | group multiple files in a single request |
| maxGroupSize | number | 5 | maximum of files to group together in a single request |
| formatGroupParamName | (number, string) => string | undefined | determine the upload request field name when more than file is grouped in a single upload |
| fileFilter | (File | string, index: number, File[] | string[]) => boolean | Promise<boolean> | undefined | return false or Promise resolving to false to exclude item from batch |
| method | string | "POST" | HTTP method in upload request |
| params | Object | undefined | collection of params to pass along with the upload (requires sendWithFormData = true) |
| forceJsonResponse | boolean | false | parse server response as JSON even if no JSON content-type header received |
| withCredentials | boolean | false | set XHR withCredentials to true |
| enhancer | UploaderEnhancer | undefined | uploader enhancer function |
| concurrent | boolean | false | issue multiple upload requests simultaneously |
| maxConcurrent | number | 2 | maximum allowed simultaneous requests |
| send | SendMethod | @rpldy/sender | how to send files to the server |
| sendWithFormData | boolean | true | upload is sent as part of formdata - when true, additional params can be sent along with uploaded data |
| formatServerResponse | FormatServerResponseMethod | undefined | function to create the batch item's uploadResponse from the raw xhr response |
| formDataAllowUndefined | boolean | false | whether to include params with undefined value |
| clearPendingOnAdd | boolean | false | whether to clear pending batch(es) when a new one is added |
| isSuccessfulCall | IsSuccessfulCall | undefined | callback to use to decide whether upload response is succssful or not |
| fastAbortThreshold | number | 100 | the pending/active item count threshold from which to start using the performant abort mechanism |
| userData | any | undefined | metadata set by the user and isn't used by the upload process in any way, provided as a convenience to pass data around |
(files: UploadInfo | UploadInfo[], options?: ?UploadOptions) => void
The way to add file(s) to be uploaded. Second parameters allows to pass different options than the ones the instance currently uses for this specific batch. These options will be merged with current instance options.
() => void
For batches that were added with autoUpload = false, the upload method must be called for the files to begin uploading.
(id?: string) => void
abort all files being uploaded or a single item by its ID
(id: string) => void
abort a specific batch by its ID
(options: UploadOptions) => UploaderType
options parameter will be merged with the instance's existing options Returns the uploader instance
() => CreateOptions
get the instance's upload options
() => void
remove all batches that were added with autoUpload = false and were not sent to upload yet.
register an event handler
register an event handler that will be called only once
unregister an existing event handler
(name: any, Object) => void
Extensions can only be registered by enhancers. If registerExtension is called outside an enhancer, an error will be thrown Name must be unique. If not, an error will be thrown
(name: any) => ?Object_
Retrieve a registered extension by its name
The Uploader will trigger for batch and batch-item lifecycle events.
Registering to handle events can be done using the uploader's on() and once() methods. Unregistering can be done using off() or by the return value of both on() and once().
const batchAddHandler = (batch, options) => {};
const unregister = uploader.on(UPLOADER_EVENTS.BATCH_ADD, batchAddHandler);
unregister(); //is equivalent to the line below
uploader.off(UPLOADER_EVENTS.BATCH_ADD, batchAddHandler);Triggered when a new batch is added.
- Parameters: (batch, uploadOptions)
This event is cancellable
Triggered when batch items start uploading
- Parameters: (batch, uploadOptions)
This event is cancellable
Triggered every time progress data is received from the upload request(s)
- Parameters: (batch, uploadOptions)
Triggered when batch items finished uploading
- Parameters: (batch, uploadOptions)
Triggered in case batch was cancelled from BATCH_START event handler
- Parameters: (batch, uploadOptions)
Triggered in case the batch was aborted
- Parameters: (batch, uploadOptions)
Triggered in case the batch was failed with an error. These errors will most likely occur due to invalid event handling. For instance, by a handler (ex: BATCH_START) throwing an error.
- Parameters: (batch, uploadOptions)
Triggered when all batch items have finished uploading or in case the batch was cancelled(abort) or had an error
- Parameters: (batch, uploadOptions)
Triggered when item starts uploading (just before) For grouped uploads (multiple files in same xhr request) ITEM_START is triggered for each item separately
- Parameters: (item, uploadOptions)
This event is cancellable
Triggered when item finished uploading successfully
- Parameters: (item, uploadOptions)
The server response can be accessed through the item's uploadResponse property and status code through uploadStatus
Triggered every time progress data is received for this file upload
- Parameters: (item)
progress info is accessed through the item's "completed" (percentage) and "loaded" (bytes) properties.
Triggered in case item was cancelled from ITEM_START event handler
- Parameters: (item, uploadOptions)
Triggered in case item upload failed
- Parameters: (item, uploadOptions)
The server response can be accessed through the item's uploadResponse property.
Triggered in case abort was called
- Parameters: (item, uploadOptions)
Triggered for item when uploading is done due to: finished, error, cancel or abort Use this event if you want to handle the state of the item being done for any reason.
- Parameters: (item, uploadOptions)
Triggered before a group of items is going to be uploaded Group will contain a single item unless "grouped" option is set to true.
Handler receives the item(s) in the group and the upload options that were used. The handler can change data inside the items and in the options by returning different data than received. See this guide for more details.
- Parameters: (items, options)
This event is cancellable
Triggered when abort is called without an item id (abort all)
- no parameters
These are events that allow the client to cancel their respective upload object (batch or batch-item) To cancel the upload, the handler must return (boolean) false.
uploader.on(UPLOADER_EVENTS.ITEM_START, (item) => {
let result;
if (item.file.name.endsWith(".xml")) {
result = false; //only false will cause a cancel.
}
return result;
});