{{JSRef}}
The DataView
view provides a low-level interface for reading and writing multiple number types in an {{jsxref("ArrayBuffer")}} irrespective of the platform's endianness.
Syntax
new DataView(buffer [, byteOffset [, byteLength]])
Parameters
buffer
- An existing {{jsxref("ArrayBuffer")}} to use as the storage for the new
DataView
object. byteOffset
{{optional_inline}}- The offset, in bytes, to the first byte in the specified buffer for the new view to reference. If not specified, the view of the buffer will start with the first byte.
byteLength
{{optional_inline}}- The number of elements in the byte array. If unspecified, length of the view will match the buffer's length.
Return value
A new DataView
object representing the specified data buffer.
Errors thrown
{{jsxref("RangeError")}}
- Thrown if the
byteOffset
andbyteLength
result in the specified view extending past the end of the buffer.
Properties
- {{jsxref("DataView.length")}}
- The
DataView
constructor's length property whose value is 3. - {{jsxref("DataView.prototype")}}
- Allows the addition of properties to all
DataView
objects.
Methods
- {{jsxref("DataView.prototype")}}
- Allows the addition of properties to all
DataView
objects.
Example
var buffer = new ArrayBuffer(16); var dv = new DataView(buffer, 0); dv.setInt16(1, 42); dv.getInt16(1); //42
Specifications
Specification | Status | Comment |
---|---|---|
{{SpecName('Typed Array')}} | {{Spec2('Typed Array')}} | Superseded by ECMAScript 6 |
{{SpecName('ES6', '#sec-dataview-constructor', 'DataView')}} | {{Spec2('ES6')}} | Initial definition in an ECMA standard |
{{SpecName('ESDraft', '#sec-dataview-constructor', 'DataView')}} | {{Spec2('ESDraft')}} |
Browser compatibility
{{CompatibilityTable}}
Feature | Chrome | Firefox (Gecko) | Internet Explorer | Opera | Safari |
---|---|---|---|---|---|
Basic support | 9.0 | {{CompatGeckoDesktop("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 | {{CompatVersionUnknown}} | {{CompatGeckoMobile("15")}} | {{CompatUnknown}} | 12.0 | 4.2 |
Firefox-specific notes
Starting with Gecko / SpiderMonkey 40 {{geckoRelease(40)}}, DataView
requires to be constructed with a {{jsxref("Operators/new", "new")}} operator. Calling DataView()
as a function without new
, will throw a {{jsxref("TypeError")}} from now on.
var dv = DataView(buffer, 0); // TypeError: calling a builtin DataView constructor without new is forbidden
var dv = new DataView(buffer, 0);
See also
- jDataView: JavaScript library that polyfills and extends the
DataView
API to all browsers and Node.js.