FormData extension type

The FormData interface provides a way to construct a set of key/value pairs representing form fields and their values, which can be sent using the fetch, XMLHttpRequest.send or navigator.sendBeacon methods. It uses the same format a form would use if the encoding type were set to "multipart/form-data".

You can also pass it directly to the URLSearchParams constructor if you want to generate query parameters in the way a form would do if it were using simple GET submission.

An object implementing FormData can directly be used in a for...of structure, instead of FormData.entries: for (const p of myFormData) is equivalent to for (const p of myFormData.entries()).

on

• JSObject

Implemented types

• JSObject

Constructors

FormData([HTMLFormElement form, HTMLElement? submitter])

factory

Properties

hashCode → int

The hash code for this object.

no setter, inherited

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

Methods

append(String name, JSAny blobValueOrValue, [String filename]) → void

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.

delete(String name) → void

The delete() method of the FormData interface deletes a key and its value(s) from a FormData object.

get(String name) → FormDataEntryValue?

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 FormData.getAll method instead.

getAll(String name) → JSArray<FormDataEntryValue>

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

has(String name) → bool

The has() method of the FormData interface returns whether a FormData object contains a certain key.

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

set(String name, JSAny blobValueOrValue, [String filename]) → void

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.

toString() → String

A string representation of this object.

inherited

Operators

operator ==(Object other) → bool

The equality operator.

inherited