The byteLength
accessor property represents the length (in bytes) of this view from the start of its ArrayBuffer
or SharedArrayBuffer
.
Syntax
dataview.byteLength
Description
The byteLength
property is an accessor property whose set accessor function is undefined
, meaning that you can only read this property. The value is established when an DataView
is constructed and cannot be changed. If the DataView
is not specifying an offset or a byteLength
, the byteLength
of the referenced ArrayBuffer
or SharedArrayBuffer
will be returned.
Examples
Using the byteLength
property
var buffer = new ArrayBuffer(8); var dataview = new DataView(buffer); dataview.byteLength; // 8 (matches the byteLength of the buffer) var dataview2 = new DataView(buffer, 1, 5); dataview2.byteLength; // 5 (as specified when constructing the DataView) var dataview3 = new DataView(buffer, 2); dataview3.byteLength; // 6 (due to the offset of the constructed DataView)
Specifications
Specification | Status | Comment |
---|---|---|
ECMAScript 2015 (6th Edition, ECMA-262) The definition of 'DataView.prototype.byteLength' in that specification. |
Standard | Initial definition. |
ECMAScript Latest Draft (ECMA-262) The definition of 'DataView.prototype.byteLength' in that specification. |
Living Standard |
Browser compatibility
The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.
Feature | Chrome | Edge | Firefox | Internet Explorer | Opera | Safari |
---|---|---|---|---|---|---|
Basic support | 9 | 12 | 15 | 10 | 12.1 | 5.1 |
Feature | Android webview | Chrome for Android | Edge mobile | Firefox for Android | IE mobile | Opera Android | iOS Safari |
---|---|---|---|---|---|---|---|
Basic support | 4 | Yes | Yes | 15 | 10 | 12 | 4.2 |