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FormData.append()

The append() method of the FormData interface appends a new value onto an existing key inside a FormData object, or adds the key if it does not already exist.
API Append FormData Method Reference XHR XMLHttpRequest

FormData.delete()

The delete() method of the FormData interface deletes a key and its value(s) from a FormData object.
API delete FormData Method Reference XHR XMLHttpRequest

FormData()

The FormData() constructor creates a new FormData object.
API Constructor FormData Reference XHR XMLHttpRequest

FormData.get()

The get() method of the FormData interface returns the first value associated with a given key from within a FormData object. If you expect multiple values and want all of them, use the getAll() method instead.
API FormData Method Reference XHR XMLHttpRequest

FormData.getAll()

The getAll() method of the FormData interface returns all the values associated with a given key from within a FormData object.
API FormData Method Reference XHR XMLHttpRequest

FormData.has()

The has() method of the FormData interface returns a boolean stating whether a FormData object contains a certain key.
API FormData has Method Reference XHR XMLHttpRequest

FormData.set()

The set() method of the FormData interface sets a new value for an existing key inside a FormData object, or adds the key/value if it does not already exist.
API FormData Method Reference set XHR XMLHttpRequest

Using FormData Objects

The FormData object lets you compile a set of key/value pairs to send using XMLHttpRequest. It is primarily intended for use in sending form data, but can be used independently from forms in order to transmit keyed data. The transmitted data is in the same format that the form's submit() method would use to send the data if the form's encoding type were set to multipart/form-data.
AJAX Blob File FormData Forms XHR XMLHttpRequest

XMLHttpRequest

XMLHttpRequest is an API that provides client functionality for transferring data between a client and a server. It provides an easy way to retrieve data from a URL without having to do a full page refresh. This enables a Web page to update just a part of the page without disrupting what the user is doing.  XMLHttpRequest is used heavily in AJAX programming.
AJAX API HTTP Interface Reference Web XHR

XMLHttpRequest.onreadystatechange

An EventHandler that is called whenever the readyState attribute changes. The callback is called from the user interface thread. The XMLHttpRequest.onreadystatechange property contains the event handler to be called when the readystatechange event is fired, that is every time the readyState property of the XMLHttpRequest changes. The callback is called from the user interface thread.
API Event Handler Property Reference XHR XMLHttpRequest

XMLHttpRequestEventTarget.onprogress

The XMLHttpRequestEventTarget.onprogress is the function called periodically with information when an XMLHttpRequest before success completely .
Event Handler Property Reference Web XHR XMLHttpRequestEventTarget

XMLHttpRequest.abort()

The XMLHttpRequest.abort() method aborts the request if it has already been sent. When a request is aborted, its readyState is set to 0 (UNSENT), but the readystatechange event is not fired.
abort AJAX API HTTP HttpRequest Method Reference XHR XMLHttpRequest