FileList extension type

The FileList interface represents an object of this type returned by the files property of the HTML input element; this lets you access the list of files selected with the <input type="file"> element. It's also used for a list of files dropped into web content when using the drag and drop API; see the DataTransfer object for details on this usage.

All <input> element nodes have a files attribute of type FileList on them which allows access to the items in this list. For example, if the HTML includes the following file input:

<input id="fileItem" type="file" />

The following line of code fetches the first file in the node's file list as a File object:

const file = document.getElementById("fileItem").files[0];

This interface was an attempt to create an unmodifiable list and only continues to be supported to not break code that's already using it. Modern APIs represent list structures using types based on JavaScript arrays, thus making many array methods available, and at the same time imposing additional semantics on their usage (such as making their items read-only).

These historical reasons do not mean that you as a developer should avoid FileList. You don't create FileList objects yourself, but you get them from APIs such as HTMLInputElement.files, and these APIs are not deprecated. However, be careful of the semantic differences from a real array.

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API documentation sourced from MDN Web Docs.

on

• JSObject

Implemented types

• JSObject

Available extensions

• JSObjectUnsafeUtilExtension

Properties

hashCode → int

The hash code for this object.

no setter, inherited

length → int

The length read-only property of the FileList interface returns the number of files in the FileList.

no setter

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

Methods

item(int index) → File?

The item() method of the FileList interface returns a File object representing the file at the specified index in the file list.

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

toString() → String

A string representation of this object.

inherited

Operators

operator ==(Object other) → bool

The equality operator.

inherited