Ajax File uploader with drag and drop

JQuery File Uploader

JQuery plugin to drag and drop files, including ajax upload and progress bar. The idea for this plugin is to keep it very simple; other options/plugins i found mess up a lot with the markup and provide some really 'hacky' ways to make it available for prehistoric browsers.

The focus will be for modern browsers, but also providing a method to know when is the plugin is not supported; with an easy interface to use on any design you come up.

Basic Javascript/Jquery knowledge is necesary to use this plugin: how to set parameters, callbacks, etc.

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API

$("#drop-area-div").dmUploader(options);

This way you can initialize the plugin. As parameter you can set all variables you want and the same goes for callbacks; down bellow you can see a list of what options and callbacks are availabe.

Markup

This is the simple html markup. The file input is optional but it provides an alternative way to select files for the user(check the online demo to se how to hide/style it)

<div id="drop-area-div" style="width:400px;height:300px;">
  Drag and Drop Files Here<br />
  or click to add files using the input<br />
  <input type="file" name="files[]" multiple="multiple" title="Click to add Files">
</div>

Even if you test all this in different browsers I recommend to add some kind of link to a basic uploader, this is still a new feature on several platforms.

Options

url

Server URL to handle file uploads.

method

Form method used by the upload request. Default is POST

extraData

Extra parameters to submit with each file. (Imagine these as 'hidden' inputs)

extraData: {
  varName:1,
  varName:'string'
}

maxFileSize

Max size of each individual file for pre-submit validation. Default is 0 (no limit)

allowedTypes

Regular expression to match file types for pre-submit validation. Default is '*'. Ej: image/*

extFilter

Extension(s) comma separted for pre-submit validation. Default is NULL. Ej: jpg;png;gif

dataType

Data type corresponds to what the server is going to return after a successful upload.

Default is null which means Jquery will try to 'guess' depending of what the server returns.

Other values can be: xml, json, script, or html

Ref: http://api.jquery.com/jquery.ajax/

fileName

Field name used to submit the files on each request. Default is file

/* As example if you set this to 'file', on the server side code you will
be able to access to the file doing something like this(if you use PHP): */
$_FILES[fileName];

Callbacks

onInit

Called once plugin is loaded, browser checks passed and it's ready to use.

onInit: function(){
  console.log('Plugin successfully initialized');
}

onFallbackMode

This is called when the Ajax/File or Drag and Drop API isn't supported by the browser. It's up to you to notify the user, change something on the UI, etc..

onFallbackMode: function(message){
  console.log('Upload plugin can't be initialized: ' + message);
}

Note: Even when D&D isn't supported by the browser user may be able to upload via the file input (if you included that on the HTML markup).

onNewFile

Called every time a file is added to the upload queue. id is a number to identify the upload.

From now on other callbacks referring to this upload will use the same id.

onNewFile: function(id, file){
  /* Fields availabe are:
     - file.name
     - file.type
     - file.size (in bytes)
  */
}

Note: As example; if a user selects/drag two files this function will be called twice.

onBeforeUpload

Called right before a upload request is sent.

onBeforeUpload: function(id){
  console.log('Starting to upload #' + id);
}

onComplete

Called after all pending upload been processed (this include error and successful uploads)

onComplete: function(){
  console.log('We reach the end of the upload Queue!');
}

onUploadProgress

If the browser supports upload progress this will be called when we have an update.

onUploadProgress: function(id, percent){
  console.log('Upload of #' + id ' is at %' + percent);
  // do something cool here!
}

onUploadSuccess

Called after a file upload was completed without errors. data contains the server response (See settings) for more

onUploadSuccess: function(id, data){
  console.log('Succefully upload #' + id);
  console.log('Server response was:');
  console.log(data);
}

onUploadError

Triggers when some kind of connection problem happened(timeout, etc..)

onUploadError: function(id, message){
  console.log('Error trying to upload #' + id + ': ' + message);
}

onFileTypeError

Called when the mimetype pre-submit validation fails. See (See settings for more.)

onFileTypeError: function(file){
  console.log('File type of ' + file.name + ' is not allowed: ' + file.type);
}

onFileSizeError

Called when the file size pre-submit validation fails. See (See settings for more.)

onFileSizeError: function(file){
  console.log('File size of ' + file.name + ' exceeds the limit');
}

onFileExtError

Called when the file extension pre-submit validation fails. See (See settings for more.)

onFileExtError: function(file){
  console.log('File extension of ' + file.name + ' is not allowed');
}