knockout-amd-helpers/ext/curl/plugins/text.js

Makes Knockout and AMD modules work better together

/** MIT License (c) copyright B Cavalier & J Hann */

/**
 * curl text! loader plugin
 *
 * Licensed under the MIT License at:
 * 		http://www.opensource.org/licenses/mit-license.php
 */

/**
 * TODO: load xdomain text, too
 *
 */

define(/*=='curl/plugin/text',==*/ function () {

	var progIds = ['Msxml2.XMLHTTP', 'Microsoft.XMLHTTP', 'Msxml2.XMLHTTP.4.0'];

	function xhr () {
		if (typeof XMLHttpRequest !== "undefined") {
			// rewrite the getXhr method to always return the native implementation
			xhr = function () { return new XMLHttpRequest(); };
		}
		else {
			// keep trying progIds until we find the correct one, then rewrite the getXhr method
			// to always return that one.
			var noXhr = xhr = function () {
					throw new Error("getXhr(): XMLHttpRequest not available");
				};
			while (progIds.length > 0 && xhr === noXhr) (function (id) {
				try {
					new ActiveXObject(id);
					xhr = function () { return new ActiveXObject(id); };
				}
				catch (ex) {}
			}(progIds.shift()));
		}
		return xhr();
	}

	function fetchText (url, callback, errback) {
		var x = xhr();
		x.open('GET', url, true);
		x.onreadystatechange = function (e) {
			if (x.readyState === 4) {
				if (x.status < 400) {
					callback(x.responseText);
				}
				else {
					errback(new Error('fetchText() failed. status: ' + x.statusText));
				}
			}
		};
		x.send(null);
	}

	function error (ex) {
		throw ex;
	}

	return {

//		'normalize': function (resourceId, toAbsId) {
//			// remove options
//			return resourceId ? toAbsId(resourceId.split("!")[0]) : resourceId;
//		},

		load: function (resourceName, req, callback, config) {
			// remove suffixes (future)
			// get the text
			fetchText(req['toUrl'](resourceName), callback, callback['error'] || error);
		},

		'plugin-builder': './builder/text'

	};

});