xoad.js

Ajax最流行书籍

var XOAD_ERROR_USER = 0x400;
var XOAD_ERROR_TIMEOUT = 0x401;

var xoad = {};

xoad.errorHandler = null;

xoad.callbacks = {};

xoad.callbacks.table = {};
xoad.callbacks.count = 0;

xoad.events = {};

xoad.events.table = [];
xoad.events.postTable = [];

xoad.events.timeout = 5000;

xoad.events.startInterval = 250;
xoad.events.refreshInterval = 2000;

xoad.events.status = 0;

xoad.observers = [];

xoad.asyncCall = function() {};

xoad.callSuspender = function()
{
	return {

		suspend		:	function() {

			this.suspended = true;
		},

		suspended	:	false
	}
};

xoad.getError = function(errorCode, errorMessage)
{
	return {

		code	:	errorCode,

		message	:	errorMessage
	}
};

xoad.getXmlHttp = function()
{
	var xmlHttp = null;

	try {

		xmlHttp = new XMLHttpRequest();

	} catch (e) {

		var progIds = ['MSXML2.XMLHTTP', 'Microsoft.XMLHTTP', 'MSXML2.XMLHTTP.5.0', 'MSXML2.XMLHTTP.4.0', 'MSXML2.XMLHTTP.3.0'];

		var success = false;

		for (var iterator = 0; (iterator < progIds.length) && ( ! success); iterator ++) {

			try {

				xmlHttp = new ActiveXObject(progIds[iterator]);

				success = true;

			} catch (e) {}
		}

		if ( ! success ) {

			return null;
		}
	}

	return xmlHttp;
};

xoad.clone = function(target, source)
{
	var wipeKeys = [];

	var key = null;

	for (key in target.__meta) {

		if (typeof(source[key]) == 'undefined') {

			wipeKeys[wipeKeys.length] = key;
		}
	}

	if (wipeKeys.length > 0) {

		for (var iterator = 0; iterator < wipeKeys.length; iterator ++) {

			target[wipeKeys[iterator]] = null;
		}
	}

	for (key in source.__meta) {

		if (source[key] == null) {

			target[key] = null;

		} else {

			target[key] = source[key];
		}
	}

	target.__meta = source.__meta;

	target.__size = source.__size;

	target.__timeout = source.__timeout;
};

xoad.serialize = function(data)
{
	if (data == null) {

		return 'N;';
	}

	var type = typeof(data);

	var code = '';

	var iterator = 0;
	var length = null;
	var asciiCode = null;
	var key = null;

	if (type == 'boolean') {

		code += 'b:' + (data ? 1 : 0) + ';';

	} else if (type == 'number') {

		if (Math.round(data) == data) {

			code += 'i:' + data + ';';

		} else {

			code += 'd:' + data + ';';
		}

	} else if (type == 'string') {

		length = data.length;

		for (iterator = 0; iterator < data.length; iterator ++) {

			asciiCode = data.charCodeAt(iterator);

			if ((asciiCode >= 0x00000080) && (asciiCode <= 0x000007FF)) {

				length += 1;

			} else if ((asciiCode >= 0x00000800) && (asciiCode <= 0x0000FFFF)) {

				length += 2;

			} else if ((asciiCode >= 0x00010000) && (asciiCode <= 0x001FFFFF)) {

				length += 3;

			} else if ((asciiCode >= 0x00200000) && (asciiCode <= 0x03FFFFFF)) {

				length += 4;

			} else if ((asciiCode >= 0x04000000) && (asciiCode <= 0x7FFFFFFF)) {

				length += 5;
			}
		}

		code += 's:' + length + ':"' + data + '";';

	} else if (type == 'object') {

		if (typeof(data.__class) == 'undefined') {

			length = 0;

			if (
			(typeof(data.length) == 'number') &&
			(data.length > 0) &&
			(typeof(data[0]) != 'undefined')) {

				for (iterator = 0; iterator < data.length; iterator ++) {

					if (typeof(data[iterator]) != 'function') {

						code += xoad.serialize(iterator);

						code += xoad.serialize(data[iterator]);

						length ++;
					}
				}

			} else {

				for (key in data) {

					if (typeof(data[key]) != 'function') {

						if (/^[0-9]+$/.test(key)) {

							code += xoad.serialize(parseInt(key));

						} else {

							code += xoad.serialize(key);

						}

						code += xoad.serialize(data[key]);

						length ++;
					}
				}
			}

			code = 'a:' + length + ':{' + code + '}';

		} else {

			code += 'O:' + data.__class.length + ':"' + data.__class + '":' + data.__size + ':{';

			if (data.__meta != null) {

				for (key in data.__meta) {

					if (typeof(data[key]) != 'function') {

						code += xoad.serialize(key);

						code += xoad.serialize(data[key]);
					}
				}
			}

			code += '}';
		}

	} else {

		code = 'N;'
	}

	return code;
};

xoad.setErrorHandler = function(handler)
{
	if (
	(handler != null) &&
	(typeof(handler) == 'function')) {

		xoad.errorHandler = handler;

		return true;
	}

	return false;
};

xoad.restoreErrorHandler = function()
{
	xoad.errorHandler = null;

	return true;
};

xoad.throwException = function(error, throwArguments)
{
	if (typeof(throwArguments) != 'undefined') {

		var sender = throwArguments[0];

		var method = throwArguments[1];

		method = 'on' + method.charAt(0).toUpperCase() + method.substr(1) + 'Error';

		if (xoad.invokeMethod(sender, method, [error])) {

			return false;
		}
	}

	if (
	(xoad.errorHandler != null) &&
	(typeof(xoad.errorHandler) == 'function')) {

		xoad.errorHandler(error);

		return false;
	}

	throw error;
};

xoad.invokeMethod = function(obj, method, invokeArguments)
{
	if (
	(obj == null) ||
	(typeof(obj) != 'object')) {

		return false;
	}

	var type = eval('typeof(obj.' + method + ')');

	if (type == 'function') {

		var invokeCode = 'obj.' + method + '(';

		if (typeof(invokeArguments) != 'undefined') {

			for (var iterator = 0; iterator < invokeArguments.length; iterator ++) {

				invokeCode += 'invokeArguments[' + iterator + ']';

				if (iterator < invokeArguments.length - 1) {

					invokeCode += ', ';
				}
			}
		}

		invokeCode += ')';

		return eval(invokeCode);
	}

	return false;
};

xoad.call = function(obj, method, callArguments)
{
	if (
	(obj == null) ||
	(typeof(obj) != 'object') ||
	(typeof(obj.__class) != 'string')) {

		return false;
	}

	var methodCallback = null;

	var methodArgs = [];

	for (var iterator = 0; iterator < callArguments.length; iterator ++) {

		if (
		(typeof(callArguments[iterator]) == 'function') &&
		(iterator == callArguments.length - 1)) {

			methodCallback = callArguments[iterator];

			continue;
		}

		methodArgs[methodArgs.length] = callArguments[iterator];
	}

	var xmlHttp = xoad.getXmlHttp();

	var requestBody = {

		source		:	obj,

		className	:	obj.__class,

		method		:	method,

		arguments	:	methodArgs
	};

	xoad.notifyObservers('call', requestBody);

	requestBody.source = xoad.serialize(requestBody.source);
	requestBody.arguments = xoad.serialize(requestBody.arguments);

	requestBody = xoad.serialize(requestBody);

	var url = obj.__url;

	if (url.indexOf('?') < 0) {

		url += '?';

	} else {

		url += '&';
	}

	url += 'xoadCall=true';

	if (methodCallback != null) {

		xmlHttp.open('POST', url, true);

	} else {

		xmlHttp.open('POST', url, false);
	}

	var callId = null;

	var callTimeout = obj.getTimeout();

	if (callTimeout != null) {

		callId = xoad.callbacks.count;
	}

	xoad.callbacks.count ++;

	var callResult = true;

	var requestCompleted = function() {

		if (typeof(callResult) == 'object') {

			if (callResult.suspended) {

				return false;
			}
		}

		if (callId != null) {

			if (eval('xoad.callbacks.table.call' + callId + '.timeout')) {

				return false;
			}

			eval('window.clearTimeout(xoad.callbacks.table.call' + callId + '.id)');

			eval('xoad.callbacks.table.call' + callId + ' = null');
		}

		if (xmlHttp.status != 200) {

			return xoad.throwException(xoad.getError(xmlHttp.status, xmlHttp.statusText), [obj, method]);

		} else {

			if (xmlHttp.responseText == null) {

				return xoad.throwException(xoad.getError(xmlHttp.status, 'Empty response.'), [obj, method]);
			}

			if (xmlHttp.responseText.length < 1) {

				return xoad.throwException(xoad.getError(xmlHttp.status, 'Empty response.'), [obj, method]);
			}

			try {

				eval('var xoadResponse = ' + xmlHttp.responseText + ';');

			} catch(e) {

				return xoad.throwException(xoad.getError(xmlHttp.status, 'Invalid response.'), [obj, method]);
			}

			if (typeof(xoadResponse.exception) != 'undefined') {

				return xoad.throwException(xoad.getError(XOAD_ERROR_USER, xoadResponse.exception), [obj, method]);
			}

			if (xoad.notifyObservers('callCompleted', xoadResponse)) {

				obj.__clone(xoadResponse.returnObject);

				if (typeof(xoadResponse.output) != 'undefined') {

					obj.__output = xoadResponse.output;

				} else {

					obj.__output = null;
				}

				return {

					returnValue	:	xoadResponse.returnValue
				};
			}
		}

		return false;
	};