The byteLength
accessor property represents the length (in bytes) of this view from the start of its ArrayBuffer
.
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
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 2017 Draft (ECMA-262) The definition of 'DataView.prototype.byteLength' in that specification. |
Draft |
Browser compatibility
Feature | Chrome | Firefox (Gecko) | Internet Explorer | Opera | Safari |
---|---|---|---|---|---|
Basic support | 9.0 | 15.0 (15.0) | 10 | 12.1 | 5.1 |
Feature | Android | Chrome for Android | Firefox Mobile (Gecko) | IE Mobile | Opera Mobile | Safari Mobile |
---|---|---|---|---|---|---|
Basic support | 4.0 | (Yes) | 15.0 (15) | ? | 12.0 | 4.2 |