[page:Loader] →

# [name]

A low level class for loading resources with XMLHttpRequest, used internaly by most loaders. It can also be used directly to load any file type that does not have a loader.

## Example

`var loader = new THREE.FileLoader(); //load a text file and output the result to the console loader.load( // resource URL 'example.txt', // onLoad callback function ( data ) { // output the text to the console console.log( data ) }, // onProgress callback function ( xhr ) { console.log( (xhr.loaded / xhr.total * 100) + '% loaded' ); }, // onError callback function ( err ) { console.error( 'An error happened' ); } );`

Note: The cache must be enabled using `THREE.Cache.enabled = true;` This is a global property and only needs to be set once to be used by all loaders that use FileLoader internally. [page:Cache Cache] is a cache module that holds the response from each request made through this loader, so each file is requested once.

## Constructor

### [name] ( [param:LoadingManager manager] )

[page:LoadingManager manager] — The [page:LoadingManager loadingManager] for the loader to use. Default is [page:DefaultLoadingManager].

## Properties

See the base [page:Loader] class for common properties.

### [property:String mimeType]

The expected [link:https://developer.mozilla.org/en-US/docs/Web/HTTP/Basics_of_HTTP/MIME_types mimeType]. See [page:.setMimeType]. Default is *undefined*.

### [property:Object requestHeader]

The [link:https://developer.mozilla.org/en-US/docs/Glossary/Request_header request header] used in HTTP request. See [page:.setRequestHeader]. Default is *undefined*.

### [property:String responseType]

The expected response type. See [page:.setResponseType]. Default is *undefined*.

### [property:String withCredentials]

Whether the XMLHttpRequest uses credentials. See [page:.setWithCredentials]. Default is *undefined*.

## Methods

See the base [page:Loader] class for common methods.

### [method:XMLHttpRequest load]( [param:String url], [param:Function onLoad], [param:Function onProgress], [param:Function onError] )

[page:String url] — the path or URL to the file. This can also be a [link:https://developer.mozilla.org/en-US/docs/Web/HTTP/Basics_of_HTTP/Data_URIs Data URI].
[page:Function onLoad] (optional) — Will be called when loading completes. The argument will be the loaded response.
[page:Function onProgress] (optional) — Will be called while load progresses. The argument will be the XMLHttpRequest instance, which contains .[page:Integer total] and .[page:Integer loaded] bytes.
[page:Function onError] (optional) — Will be called if an error occurs.
Load the URL and pass the response to the onLoad function.

### [method:FileLoader setMimeType]( [param:String mimeType] )

Set the expected [link:https://developer.mozilla.org/en-US/docs/Web/HTTP/Basics_of_HTTP/MIME_types mimeType] of the file being loaded. Note that in many cases this will be determined automatically, so by default it is *undefined*.

### [method:FileLoader setRequestHeader]( [param:Object requestHeader] )

[page:object requestHeader] - key: The name of the header whose value is to be set. value: The value to set as the body of the header.
Set the [link:https://developer.mozilla.org/en-US/docs/Glossary/Request_header request header] used in HTTP request.

### [method:FileLoader setResponseType]( [param:String responseType] )

Change the response type. Valid values are:
[page:String text] or empty string (default) - returns the data as [page:String String].
[page:String arraybuffer] - loads the data into a [link:https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/ArrayBuffer ArrayBuffer] and returns that.
[page:String blob] - returns the data as a [link:https://developer.mozilla.org/en/docs/Web/API/Blob Blob].
[page:String document] - parses the file using the [link:https://developer.mozilla.org/en-US/docs/Web/API/DOMParser DOMParser].
[page:String json] - parses the file using [link:https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/JSON/parse JSON.parse].

### [method:FileLoader setWithCredentials]( [param:Boolean value] )

Whether the XMLHttpRequest uses credentials such as cookies, authorization headers or TLS client certificates. See [link:https://developer.mozilla.org/en-US/docs/Web/API/XMLHttpRequest/withCredentials XMLHttpRequest.withCredentials].
Note that this has no effect if you are loading files locally or from the same domain.

## Source

[link:https://github.com/mrdoob/three.js/blob/master/src/[path].js src/[path].js]