pryley / site-reviews

;(function() {

	'use strict';

	GLSR.Ajax = function() {

		/** @return void */

		this.get = function( url, successCallback ) {

			var xhr = new XMLHttpRequest();

			xhr.open( 'GET', url );

			xhr.onreadystatechange = function() {

				if( xhr.readyState !== 4 )return;

				successCallback( xhr.responseText );

			};

			xhr.setRequestHeader( 'X-Requested-With', 'XMLHttpRequest' );

			xhr.send();

		};

		/** @return bool */

		this.isFileAPISupported = function() {

			var input = document.createElement( 'INPUT' );

			input.type = 'file';

			return 'files' in input;

		};

		/** @return bool */

		this.isFormDataSupported = function() {

			return !!window.FormData;

		};

		/** @return bool */

		this.isUploadSupported = function() {

			var xhr = new XMLHttpRequest();

			return !!( xhr && ( 'upload' in xhr ) && ( 'onprogress' in xhr.upload ));

		};

		/** @return void */

		this.post = function( data, successCallback, headers ) {

			var xhr = new XMLHttpRequest();

			this.setHeaders_( xhr, headers );

			xhr.open( 'POST', GLSR.ajaxurl );

			xhr.onreadystatechange = function() {

				if( xhr.readyState !== 4 )return;

				successCallback( JSON.parse( xhr.responseText ));

			};

			xhr.send({

				action: GLSR.action,

				request: data,

			});

		};

		/** @return void */

		this.setHeaders_ = function( xhr, headers ) {

			headers = headers || {};

			headers['X-Requested-With'] = 'XMLHttpRequest';

			for( var key in headers ) {

				if( !headers.hasOwnProperty( key ))continue;

				xhr.setRequestHeader( key, headers[key] );

			}

		};

	};

})();