Fine Uploader 3.1.1 (Released Dec. 17)

3.2 is planned for Jan. 13

Actively developed by Ray Nicholus. Created by Andrew Valums.
### Quick Links ### * [Downloads](https://github.com/valums/file-uploader/wiki/Releases) * [Support](https://groups.google.com/forum/#!forum/fineuploader) * [Blog](http://blog.fineuploader.com) * [@fineuploader](https://twitter.com/fineuploader) * [Homepage](http://fineuploader.com)
###Table of Contents### - [Summary](#summary) - [Features](#features) - [Getting started](#getting-started) - [Server-side requirements](https://github.com/valums/file-uploader/blob/master/server/readme.md) - [Using the optional jQuery plug-in](#using-the-optional-jquery-plug-in) - [Setting up the uploader without jQuery](#setting-up-the-uploader-without-jquery) - [How to override options](#how-to-override-options) - [Options of both FineUploader & FineUploaderBasic](#options-of-both-fineuploader--fineuploaderbasic) - [Options of FineUploader](#options-of-fineuploader) - [Styling FineUploader](#styling-fineuploader) - [Callbacks (FineUploader & FineUploaderBasic)](#callbacks-fineuploader--fineuploaderbasic) - [Changing alert/messages to something more user friendly](#changing-alertmessages-to-something-more-user-friendly) - [Instance methods](#instance-methods) - [qQuery (Utility Functions)](#qquery) - [Internet Explorer limitations](#internet-explorer-limitations) - [Troubleshooting](#troubleshooting) - [Issue Tracker](#issue-tracker) - [License](#license) - [Contributors](#contributors)
### Summary ### Welcome! This project attempts to achieve a user-friendly file-uploading experience over the web. It's built as a Javascript plugin for developers looking to incorporate file-uploading into their website.

This plugin uses an XMLHttpRequest (AJAX) for uploading multiple files with a progress-bar in FF3.6+, Safari4+, Chrome and falls back to hidden-iframe-based upload in other browsers (namely IE), providing good user experience everywhere.

It does not use Flash, jQuery, or any other external libraries. There is an optional jQuery plug-in that can be used to integrate Fine Uploader into your project, but it is NOT required. The same features are available with or without the jQuery plug-in.

### Features ### * Multiple file select, progress-bar in FF, Chrome, and Safari * Drag-and-drop file select in FF, Chrome, and Safari (OS X) * Uploads are cancelable * No external dependencies **at all** if using FineUploader or FineUploaderBasic. If using the optional jQuery wrapper, jQuery is of course required. * FineUploaderBasic only requires the associated Fine Uploader javascript file. All Fine Uploader css and image files can be omitted. * Doesn't use Flash * Fully working with HTTPS * Tested in IE7+, Firefox, Safari (OS X), Chrome, IOS6, and various versions of Android. IE10 is now also supported! * Ability to upload files as soon as they are selected, or "queue" them for uploading at user's request later * Display specific error messages from server on upload failure (hover over failed upload item) * Ability to auto-retry failed uploads * Option to allow users to manually retry a failed upload * Create your own file validator and/or use some default validators include with Fine Uploader * Receive callback at various stages of the upload process * Send any parameters server-side along with each file. * Upload directories via drag and drop (Chrome 21+). * [Include parameters in the query string OR the request body.](http://blog.fineuploader.com/2012/11/include-params-in-request-body-or-query.html) * Submit files to be uploaded via the API. * Any many more!
### Getting started ### The combined javascript file contains two classes that are meant to be used directly. If you need a complete upload widget (from demo) to quickly drop into your current design, use `qq.FineUploader`. Note that a set of utility functions, used internally by Fine Uploader, are also publicly accessible. See the utils.js file for an easy reference of the utility functions present in the combined javascript file. The QUnit tests may also serve has helpful documentation.

If you want to customize the uploader, by using a different looking file list or change the behaviour or functionality use qq.FineUploaderBasic.

The difference between them is that qq.FineUploader provides a list of files, drag-and-drop, but qq.FineUploaderBasic only creates button and handles validation. Basic uploader is easier extendable, and doesn't limit possible customization.

qq.FineUploader extends qq.FineUploaderBasic, so that all the options present in the basic uploader also exist in the full widget.

### Using the optional jQuery plug-in ### A jQuery plug-in exists that wraps the native Fine Uploader code. If you would like to reap all of the benefits that a jQuery plug-in offers, such as use of jQuery Events, specifying elements using the jQuery object/jQuery selectors, easy integration into your otherwise jQuery project: look no further!

To use the jQuery plug-in, ensure you include the proper Fine Uploader js file on your page, and instantiate it like so:

$('#fineUploaderElementId').fineUploader({
    request: {
        endpoint: '/upload/endpoint'
    }
});

The above example is the simplest possible use-case. Note that you can use any of the options available for the native Fine Uploader and Fine Uploader Basic, with the following exceptions & additions:

• There is no need to specify the element option. It will be ignored if you pass it in. The plug-in will pass the element option for you, using the element you associated with the plug-in (the element with an id of fineUploaderElementId in the above example).
• If you plan on using FineUploaderBasic, include the uploaderType option with a value of 'basic'. If not specified, it is assumed that you intend to use FineUploader.

Options that require an HTMLElement

For any option with an HTMLElement value, you can, instead, pass a jQuery object. For example, if you specify the button option, the value can be $('#myButton').

If the option takes an array of HTMLElements, any item in the array that is a jQuery object will be evaluated and all HTMLElements associated with that jQuery object will be added to the array when it is passed to the native Fine Uploader. For example, if specify a value for the extraDropzones option, and, say, your value is [$('.myExtraDropzone')], and there are 3 elements in the DOM with this class, the plug-in will pass all 3 elements to native Fine Uploader.

Callbacks

All callbacks defined in the native uploader are also available when using the jQuery plug-in. However, as is common with jQuery plug-ins, these callbacks are actually custom events. For example, if you want to be notified whenever an error occurs and whenever an upload has completed, your client-side code may look something like this:

$('#fineUploaderElementId').fineUploader({
    request: {
        endpoint: '/upload/endpoint'
    }
}).on('error', function(event, id, filename, reason) {
     //do something
  })
  .on('complete', function(event, id, filename, responseJSON){
    //do something
  });

It may be important to note that The value returned from your event/callback handler may be examined by the uploader. This is relevant for the onSubmit, onValidate and onManualRetry callbacks, at this point. As the documentation states, if you want to cancel an upload in your onSubmit or onValidate callback handlers, simply return false. This is also true when using the jQuery plug-in.

Also, please note that the context of your event handler, by default, is the event target. This is, in fact, true, by default, for all jQuery event handlers, not just event handlers associated with Fine Uploader. Say you want to change the parameters sent along with a file when handling a submit event. Your code can be as simple as this:

$('#fineUploaderElementId').fineUploader({
    request: {
        endpoint: '/upload/endpoint'
    }
}).on('submit', function(event, id, filename) {
     $(this).fineUploader('setParams', {'param1': 'val1'});
  });

Public API / Instance Functions

All public API (instance) functions defined in the native javascript uploader are accessible when using the jQuery plug-in. Public/instance functions on a jQuery plug-in are made accessible as recommended in the jQuery plug-in documentation. Looking for an example? Please see the above code fragment, where we call the setParams instance function and pass it an object.

For more examples using the jQuery plug-in, please have a look at fineuploader.com.

### Setting up the uploader without jQuery ### Of course, Fine Uploader does NOT depend on jQuery, and you don't have to use the jQuery plug-in if you don't want to. The same features are available without the jQuery plug-in. To use Fine Uploader with "plain 'ole" javascript, include the uploader javascript file and, optionally, `fineuploader.css` along with any images provided into your page. If you are only making use of FineUploaderBasic, you can omit the css and image(s) file(s).

<div id="fine-uploader">
<noscript>
    <p>Please enable JavaScript to use Fine Uploader.</p>
    <!-- or put a simple form for upload here -->
</noscript>
</div>

Initialize uploader when the DOM is ready. Change the endpoint option. In the server folder you will find some examples for different platforms. If you can't find the one you need, please read up on handling multipart form requests and XHR upload requests in your server-side language of choice.

var uploader = new qq.FineUploader({
	// pass the dom node (ex. $(selector)[0] for jQuery users)
	element: document.getElementById('fine-uploader'),
	
	request: {
      		// path to server-side upload script
		endpoint: '/server/upload'
	}
});

For more examples, please have a look at fineuploader.com.

### How to Override Options ### This is mostly obvious, but you should know that it is actually much easier to override "sub-properties" than expected. Take the `messages` option (object) in FineUploaderBasic, for example. Suppose you only want to override the `typeError` default message, but want to use the default values for the other messages properties. Well, simply define a new value for the `typeError` property when initializing your FineUploaderBasic (or FineUploader) instance: ```javascript messages: { typeError: "This is not a valid type" } ``` Fine Uploader will know that you only want to change the `typeError` message value and keep all of the other default values. This works for all options that are, themselves, objects with sub-options.
### Options of both FineUploader & FineUploaderBasic ###

Name	Type	Default	Note
debug	boolean	false	If enabled, this will result in log messages (such as server response) being written to the javascript console. If your browser does not support the [window.console object](https://developer.mozilla.org/en-US/docs/DOM/console.log), the value of this option is irrelevant.
button	element	null	Specify an element to use as the "select files" button. Note that this may NOT be a <button>, otherwise it will not work in Internet Explorer. Please see issue #33 for details.
multiple	boolean	true	Set to false puts the uploader into what is best described as 'single-file upload mode'. See the [demo](http://fineuploader.com) for an example.
maxConnections	integer	3	Maximum allowable concurrent uploads.
disableCancelForFormUploads	boolean	false	If true, the cancel link does not appear next to files when the form uploader is used. This may be desired since it may not be possible to interrupt a form-based upload in some cases.
autoUpload	boolean	true	Set to false if you want to be able to begin uploading selected/queued files later, by calling uploadStoredFiles().

##### `request` option properties: #####

Name	Type	Default	Note
endpoint	string (path)	/server/upload	The is the endpoint used by both the form and ajax uploader. In the case of the form uploader, it is part of the form's action attribute value along with all parameters. In the case of the ajax uplaoder, it is makes up part of the URL of the XHR request (again, along with the parameters).
params	object	{}	These parameters are sent with the request to the endpoint specified in the action option. An individual parameter value may be a number, string, another object, or a function that returns a number or string. See the associated blog post for more details.
paramsInBody	boolean	false	Set this to true if you want all parameters to be sent in the request body. Note that setting this option to true will force all requests to be multipart encoded. If the value is false all params will be included in the query string. See the associated blog post for more details.
customHeaders	object	{}	Additional headers sent along with the XHR POST request. Note that is option is only relevant to the ajax/XHR uploader.
forceMultipart	boolean	false	While form-based uploads will always be multipart requests, this forces XHR uploads to send files using multipart requests as well.
inputName	string	qqfile	This usually only useful with the ajax uploader, which sends the name of the file as a parameter, using a key name equal to the value of this options. In the case of the form uploader, this is simply the value of the name attribute of the file's associated input element.

validation option properties:

Name	Type	Default	Note
allowedExtensions	array of strings	[]	This may be helpful if you want to restrict uploaded files to specific file types. Note that this validation option is only enforced by examining the extension of uploaded file names. For a more complete verification of the file type, you should use, for example, magic byte file identification on the server side and return {"success": false} in the response if the file type is not on your whitelist.
acceptFiles	comma-separated strings	null	This option is used solely by the file selection dialog. If you'd like to restict valid file types that appear in the selection dialog, you can do this here by listing valid content type specifiers. See the [documentation on the accept attribute of the input element](https://developer.mozilla.org/en-US/docs/HTML/Element/Input) for more information.
sizeLimit	integer	0 (no limit)	Maximum allowable size, in bytes, for a file.
minSizeLimit	integer	0 (no limit)	Minimum allowable size, in bytes, for a file.
stopOnFirstInvalidFile	boolean	true	If true, when submitting multiple files, once a file is determined to be invalid, the upload process will terminate. If false, all valid files will be uploaded. Note: One downside to a false value can be seen when using FineUploader if the default showMessage implementation is not overriden. In this case, an alert dialog will appear for each invalid file in the batch, and the upload process will not continue until the dialog is dismissed. If this is bothersome, simply override showMessage with a desirable implementation. A later version may have a showMessage default implementation that does not use the alert function.

retry option properties:

Name	Type	Default	Note
enableAuto	boolean	false	If set to true, any error or non-200 response will prompt the uploader to automatically attempt to upload the file again.
maxAutoAttempts	number	3	The maximum number of times the uploader will attempt to retry a failed upload. Ignored if enableAuto is false.
autoAttemptDelay	number	5	The number of seconds the uploader will wait in between automatic retry attempts. Ignored if enableAuto is false.
preventRetryResponseProperty	string	preventRetry	If this property is present in the server response and contains a value of true, the uploader will not allow any further retries of this file (manual or automatic).

### Options of FineUploader ###

Name	Type	Default	Note
element	element	null	Container for the default drop zone (if supported by browser) and files list. Required
listElement	element	null	Container for the file list. If null, the list defined in the template will be used.

##### `dragAndDrop` option properties: #####

Name	Type	Default	Note
extraDropzones	array of elements	[]	Useful if you'd like to to designate additional dropozones for file input. Of course, this is not relevant if the form uploader is used.
hideDropzones	boolean	true	Useful if you do not want all dropzone elements to be hidden. It is expected that some CSS would accompany setting this option to false. You may set this to false if you want to wrap some visible elements, such as the listElement, in a drop zone.
disableDefaultDropzone	boolean	false	Set this to true if you are contributing your own drop zone(s) and do not want to use the default one.

##### `text` option properties: #####

Name	Type	Default	Note
uploadButton	string	Upload a file	Label for the file selector button
cancelButton	string	cancel	The cancel button text (which is more of a link than a button).
failUpload	string	Upload failed	Text that appears next to a failed file item
dragZone	string	Drop files here to upload	Text that appears in the drop zone when it is visible
formatProgress	string	{percent}% of {total_size}	Text that appears next to a file as it is uploading (if the browser supports the file API)

##### `failedUploadTextDisplay` option properties: #####

Name	Type	Default	Note
mode	string	default	Valid values are "default" (display the text defined in failUploadText next to each failed file), "none" (don't display any text next to a failed file), and "custom" (display error response text from the server next to the failed file).
maxChars	integer	50	The maximum amount of character of text to display next to the file. After the limit has been reached, "..." will terminate the string. This is ignored unless mode is "custom".
responseProperty	string	error	The property from the server response containing the error text to display next to the failed file. This is ignored unless mode is "custom".
enableTooltip	boolean	true	If set to true, a tooltip will display the full contents of the error message when the mouse pointer hovers over the failed file. Note that this currently uses the title attribute of the failed file element, but there is an issue to improve this (see #355 for details).

retry option properties:

Name	Type	Default	Note
showAutoRetryNote	boolean	true	If set to true, a status message will appear next to the file during automatic retry attempts.
autoRetryNote	string	Retrying {retryNum}/{maxAuto}...	The text of the note that will optionally appear next to the file during automatic retry attempts. Ignored if showAutoRetryNote is false.
showButton	boolean	false	If true, a button/link will appear next to a failed file after all retry attempts have been exhausted, assuming the server has not prohibited further retry attempts via the preventRetryResponseProperty. This button/link will allow the user to manually order the uploader to make another attempt at uploading the failed file. Note that this operation does respect the maxConnections value, so if all connections are accounted for, the retry attempt will be queued until a connection opens up.

### Styling FineUploader ### The `template` option contains default elements with default classes that make up the uploader as a whole in the DOM. For example, the first default element in `template` is a `div` with a class of `qq-uploader`. This is the parent element of the uploader. The default drop area, button, and file list elements are also, by default, contained in this option. You can use this option to add additional elements, modify default template elements, etc.

There is also a fileTemplate option which contains default elements that make up one file item in the file list.

Finally, a classes option allows you to change the default class names for these elements. Be sure the values in classes match the class names used in the corresponding template elements (where appropriate).

### Callbacks (FineUploader & FineUploaderBasic) ### * `onSubmit(String id, String fileName)` - called when the file is submitted to the uploader portion of the code. Note that this does not mean the file upload will begin at this point. Return `false` to prevent submission to the uploader. * `onComplete(String id, String fileName, Object responseJSON)` - called when the file upload has finished. * `onCancel(String id, String fileName)` - called when the file upload has been cancelled. * `onUpload(String id, String fileName)` - called just before the file upload begins * `onProgress(String id, String fileName, int uploadedBytes, int totalBytes)` - called during the upload, as it progresses. Only used by the XHR/ajax uploader. * `onError(String id, String fileName, String errorReason)` - called whenever an exceptional condition occurs (during an upload, file selection, etc). * `onAutoRetry(String id, String fileName, String attemptNumber)` - called before each automatic retry attempt for a failed file. * `onManualRetry(String id, String fileName)` - called before each manual retry attempt. Return false to prevent this and all future retry attempts on this file. * `onValidate(Array fileData)` - This callback is invoked with FileData objects for each of the dropped/selected files. This allows you to prevent the entire batch from being uploaded if desired. To prevent any files in this batch from being uploaded, simply return false. If your handler does not return false, this callback will also be invoked once for each individual file submitted. In that case, the array will contain only one `FileData` object for each call. If you want to only prevent specific files from being uploaded, you can return false here when appropriate. This callback is always invoked before the default Fine Uploader validators execute. Note that a `FileData` object has two properties: `name` (the file name) and `size` (the file size). The `size` property will be undefined if the user agent does not support the File API.
### Changing alert/messages to something more user friendly ### You may want to change the default alert implementation and messages as you see fit. This is possible by overriding the `showMessage` function option, as well as the `messages` properties in FineUploader. The default `showMessage` function simply invokes `alert` with the message text. One instance in which this is used is when the user attempts to select an invalid file for upload. There are general message types with default text that can be overriden as well.
### Instance methods ### * `log(String message)` - Outputs a message to the javascript console, if possible. * `setParams(Object newParams, [optional] Number fileId)` - Set the parameters sent along with the request after initializing the uploader. You can either change the parameters for a specific file, or for all files. To do the latter, simply omit the `fileId` parameter. See this [blog post explaining parameters](http://blog.fineuploader.com/2012/11/include-params-in-request-body-or-query.html) as well as [this one explaining how this function works in 3.1 and later versions](http://blog.fineuploader.com/2012/12/setparams-is-now-much-more-useful-in-31.html). * `uploadStoredFiles()` - If `!autoUpload`, this will begin uploading all queued files. * `clearStoredFiles()` - Clears the internal list of stored files. Only applicable when `autoUpload` is set to false. * `getInProgress()` - Returns the number of files that are either currently uploading or files waiting in line for upload. * `retry(String fileId)` - Orders the uploader to make another attempt at uploading a specific file. A NO-OP if the server prohibits retries on a failed file via the preventRetryResponseProperty. Note that this operation does respect the maxConnections value, so if all connections are accounted for, the retry attempt will be queued until a connection opens up. * `cancel(String fileId)` - Cancels a queued or currently uploading file. * `getItemByFileId(String fileId)` - Returns the HTMLElement associated with the passed file ID. * `reset()` - While this function is most useful for FineUploader, it is also available in FineUploaderBasic. In FineUploader, calling this function will reset all UI elements to the state they exsited in immediately after initialization. In FineUploaderBasic, this resets all internal variables to the state they existed in immediately after initialization. If you are using FineUploaderBasic, it is up to you to "reset" any of your UI elements. * `addExtraDropzone(HTMLElement element)` - Use this to mark an element as a drop zone on an already-instantiated FineUploader. * `removeExtraDropzone(HTMLElement element)` - Use this to un-mark an extra element as a drop zone on an already-instantiated FineUploader. An "extra" drop zone is one specified in the `extraDropzones` option, or one set via the `addExtraDropzone` function. * `addFiles(filesOrInputs)` - Use this if you would like to submit files to the uploader. This may be useful if you have a method of gathering files that does not include Fine Uploader's input button or the drag & drop support built into FineUploader. This function accepts the following types: `File`, `input` element, or a collection of any of these types, provided the collection object contains an (integer) index property for each contained item.
### qQuery ### Fine Uploader, which lives in the `qq` namespace, also contains a number of utility functions in the same namespace. While these functions were developed to be used by the internal Fine Uploader code, they are all public functions and many of them may be useful to others. If, for example, you cannot or do not want to import a 3rd-party library such as jQuery, Fine Uploader's qQuery contains a number of useful utility functions. I will document the ones that are most likely to be useful outside of Fine Uploader below:

qq(HTMLElement)

The functions below are part of the qq(HTMLElement) function. This is similar to the jQuery function that takes, for one, a selector string. qq(...) is a bit simpler and less advanced, though. It only accepts one HTMLElement (for now). For example, if you want to hide an element with an ID of "myDiv":

var myDiv = document.getElementById('myDiv');
qq(myDiv).hide();

The following element-related functions are available on the qq(...) function. Unless otherwise specified, the function returns the qq instance to allow chaining:

• hide() - Hides this element.
• attach(String type, Function callback) - attach an event handler to this element for a specific type of native DOM event. Returns a detach function.
• detach(String type, Function originalCallback) - detach an already attached event handler given a specific event type and callback function.
• contains(HTMLElement descendant) - Returns true if this element contains the passed element.
• insertBefore(HTMLElement elementB) - Inserts this element directly before the passed element in the DOM.
• remove() - Removes this element from the DOM.
• css(Object styles) - Specify css styles for this element, such as {top: 0, right: 0}.
• hasClass(String className) - Returns true if this element has the passed class name.
• addClass(String className) - Adds the passed class to this element.
• removeClass(String className) - Removes the passed class from this element.
• getByClass(String className) - Returns an array of all descendants of this element that contain the passed class name.
• setText(String text) - Sets the text for this element.
• clearText(String text) - Clears all text for this element.
• children() - Returns an array of all immediate children elements of this element.

The following utility functions are also available in the qq namespace as:

• qq.isObject(somevar) - Returns true if the parameter is a "simple" object, such as {foo: "bar"} or new Object().
• qq.extend(Object firstObj, Object secondObj, Boolean extendNested) - Copies the properties of secondObj to firstObj. If extendNested is true, sub-properties of secondObj are copied over as well.
• qq.indexOf(Array array, String item, Number startingIndex) - Same as indexOf from Javascript 1.6, but implemented for browsers that don't support this native function, such as IE8 and earlier.
• qq.preventDefault(Event) - A function used to prevent the user agent's default action. To be used inside an event handler.
• qq.toElement() - Creates and returns a new DIV element.
• qq.each(objectOrArray, callback) - Iterates through an object or array, passing your callback the key and value for each element in the object. return false; to stop iteration.
• qq.log(String logMessage, (optional) String logLevel) - Log a message to the console. No-op if console logging is not supported by the user agent. Will delegate to the user agent's logging function that corresponds to the passed logging level, if it exists. If a comparable function does not exist, but console logging is supported, the log event will be delegated to console.log and the log level will be included in the message.
• qq.ie10() - Returns true if the current user agent is Internet Explorer 10.
• qq.ie() - Returns true if the current user agent is Internet Explorer.
• qq.safari() - Returns true if the current user agent is Safari.
• qq.chrome() - Returns true if the current user agent is Chrome.
• qq.firefox() - Returns true if the current user agent is Firefox.
• qq.windows() - Returns true if the current user agent is running on the Microsoft Windows platform.
• qq.isXhrUploadSupported() - Returns true if the current user agent is capable of sending files using an ajax request.
• qq.isFolderDropSupported() - Returns true if the current user agent is capable of handling dropped folders.

### Internet Explorer Limitations ### IE continues to lag _far_ behind all other browsers in terms of features. IE10 is supposed to, finally, start to compete with existing modern browsers. For those of you with customers suffering with IE9 and older, here are some of the limitations you may want to be aware of when using Fine Uploader:

Limitation	Why?	Supported/Fixed in IE10?
Can't parse JSON response if response code is not 200	If the response code is not 200, and the size of the response is less than 512, or, apparently, sometimes, less than 256 bytes, IE replaces the response with a "friendly" error message. If you insist on returning responses with a status code other than 200, you can work around this by instructing IE users to uncheck the "show friendly HTTP error messages" setting.	No
No progress indicator	Lack of blob/File API support	Yes
Content-Size header field value does not match the actual file size	This isn't technically an IE issue, but I'm going to call it one since we are forced to use multipart request in IE. The content-size for multipart data requests does not refer only to the file. Rather, it refers to the the total size of all sections in the request.	N/A
Size restriction options are not enforced	This is due to the lack of support for the File API. Without it, we have no way to determine the size of each selected file.	Yes
Can't drag & drop files	Lack of File API support	Yes
Can't select multiple files in the file selection dialog	The <input> element does not support the multiple attribute	Yes
Only mulipart form request may be used to send files, via form submission	Lack of File API support	Yes
No logging	IE8 and older only: console.log is not implemented	Yes
Cancelling an upload has no effect	Not really an IE problem, but since we are forced to upload files via form submission, I thought I'd include it. There may be a way to make this work, but I haven't spent time playing around with the available options yet. In the meantime, you should probably set the disableCancelForFormUploads option to true. If I can't find a way to properly allow cancel to work when using the form uploader, I'll probably remove the cancel link when the form uploader is in use.	Yes
Can't use a <button> as the element when setting the button option.	The button receives the click event, instead of the child <input> element that ultimately triggers the file dialog	No
Any response content-type other than "text/plain" causes issues when trying to parse the JSON response	IE does strange things with the response when the content-type is, for example, "application/json" or "text/html". The latter is only a problem if you return HTML in your JSON response.	Yes
Can't determine response code	Not really an IE problem, but since we are forced to upload files via form submission, I thought I'd include it. This is really a side-effect of using a form submission to upload files.	Yes

### Troubleshooting ### If you can't get the uploader to work, please try the following steps before asking for help.

If the upload doesn't complete, saying "failed":

• Set the debug option of the FineUploader to true.
• Open the page where you have a FineUploader.
• Open developer console in your browser.
• Try to upload the file. You should see a server response.

It should be {"success":true} for completed requests. If it's not, then you have a problem with your server-side script.

### Issue Tracker ### Have a bug or feature request? Please [create an issue here on GitHub](https://github.com/valums/file-uploader/issues) that conforms with [necolas's guidelines](https://github.com/necolas/issue-guidelines/blob/master/README.md).
### License ### This plugin is open sourced under MIT license, GNU GPL 2 or later and GNU LGPL 2 or later. Please see the license.txt file for details.
### Contributors ### We would love developers to contribute any improvements and bugfixes they produce. Note that any pull requests MUST be against an "IP" branch! See [How do I contribute to other's code in GitHub?](http://stackoverflow.com/questions/4384776/how-do-i-contribute-to-others-code-in-github).

Thanks to everybody who contributed, either by sending bug reports or donating. The project wouldn't be possible without all this generous help. Thank you!