Uint32Array Object

A typed array of 32-bit unsigned integer values. The contents are initialized to 0. If the requested number of bytes could not be allocated an exception is raised.

Syntax


      uint32Array = new Uint32Array( length );  
uint32Array = new Uint32Array( array );  
uint32Array = new Uint32Array( buffer, byteOffset, length);  

Parameters

uint32Array
Required. The variable name to which the Uint32Array object is assigned.

length
Specifies the number of elements in the array.

array
The array (or typed array) that is contained in this array. The contents are initialized to the contents of the given array or typed array, with each element converted to the Uint32 type.

buffer
The ArrayBuffer that the Uint32Array represents.

byteOffset
Optional. Specifies the offset in bytes from the start of the buffer at which the Uint32Array should begin.

length
The number of elements in the array.

Constants

The following table lists the constants of the Uint32Arrayobject.

Constant Description
BYTES_PER_ELEMENT Constant The size in bytes of each element in the array.

Properties

The following table lists the constants of the Uint32Arrayobject.

Property Description
buffer Property Read-only. Gets the ArrayBuffer that is referenced by this array.
byteLength Property Read-only. The length of this array from the start of its ArrayBuffer, in bytes, as fixed at construction time.
byteOffset Property Read-only. The offset of this array from the start of its ArrayBuffer, in bytes, as fixed at construction time.
length Property The length of the array.

Methods

The following table lists the methods of the Uint32Arrayobject.

Method Description
set Method (Uint32Array) Sets a value or an array of values.
subarray Method (Uint32Array) Gets a new Uint32Array view of the ArrayBuffer store for this array.

Example

The following example shows how to use a Uint32Array object to process the binary data acquired from an XMLHttpRequest:

var req = new XMLHttpRequest();  
    req.open('GET', "http://www.example.com");  
    req.responseType = "arraybuffer";  
    req.send();  

    req.onreadystatechange = function () {  
        if (req.readyState === 4) {  
            var buffer = req.response;  
            var dataview = new DataView(buffer);  
            var ints = new Uint32Array(buffer.byteLength / 4);  
            for (var i = 0; i < ints.length; i++) {  
                ints[i] = dataview.getUint32(i * 4);  
            }  
        alert(ints[10]);  
        }  
    }  

Requirements

Supported in the following document modes: Internet Explorer 10 standards and Internet Explorer 11 standards. Also supported in Store apps (Windows 8 and Windows Phone 8.1). See Version Information.
Not supported in the following document modes: Quirks, Internet Explorer 6 standards, Internet Explorer 7 standards, Internet Explorer 8 standards, Internet Explorer 9 standards.