engine.js

几个运用了DWR框架编写的AJAX代码,

if (reply.search("DWREngine._handle") == -1) {
DWREngine._handleMetaDataError(null, "Invalid reply from server");
return;
}

if (status != 200) {
if (reply == null) reply = "Unknown error occured";
DWREngine._handleMetaDataError(null, reply);
return;
}

eval(reply);


DWREngine._clearUp(batch);
}
catch (ex) {
if (ex == null) ex = "Unknown error occured";
DWREngine._handleMetaDataError(null, ex);
}
finally {



if (DWREngine._batchQueue.length != 0) {
var sendbatch = DWREngine._batchQueue.shift();
DWREngine._sendData(sendbatch);
DWREngine._batches[DWREngine._batches.length] = sendbatch;
}
}
}
};






DWREngine._handleResponse = function(id, reply) {

var handlers = DWREngine._handlersMap[id];
DWREngine._handlersMap[id] = null;

if (handlers) {


try {
if (handlers.callback) handlers.callback(reply);
}
catch (ex) {
DWREngine._handleMetaDataError(handlers, ex);
}
}


if (DWREngine._method == DWREngine.IFrame) {
var responseBatch = DWREngine._batches[DWREngine._batches.length-1];

if (responseBatch.map["c"+(responseBatch.map.callCount-1)+"-id"] == id) {
DWREngine._clearUp(responseBatch);
}
}
};




DWREngine._handleServerError = function(id, error) {

var handlers = DWREngine._handlersMap[id];
DWREngine._handlersMap[id] = null;
if (error.message) {
DWREngine._handleMetaDataError(handlers, error.message, error);
}
else {
DWREngine._handleMetaDataError(handlers, error);
}
};




DWREngine._abortRequest = function(batch) {
if (batch && batch.metadata != null && !batch.completed) {
DWREngine._clearUp(batch);
if (batch.req) batch.req.abort();

var handlers;
var id;
for (var i = 0; i < batch.ids.length; i++) {
id = batch.ids[i];
handlers = DWREngine._handlersMap[id];
DWREngine._handleMetaDataError(handlers, "Timeout");
}
}
};




DWREngine._clearUp = function(batch) {
if (batch.completed) {
alert("double complete");
return;
}


if (batch.div) batch.div.parentNode.removeChild(batch.div);
if (batch.iframe) batch.iframe.parentNode.removeChild(batch.iframe);
if (batch.form) batch.form.parentNode.removeChild(batch.form);


if (batch.req) delete batch.req;

for (var i = 0; i < batch.postHooks.length; i++) {
batch.postHooks[i]();
}
batch.postHooks = null;


for (var i = 0; i < DWREngine._batches.length; i++) {
if (DWREngine._batches[i] == batch) {
DWREngine._batches.splice(i, 1);
break;
}
}

batch.completed = true;
};




DWREngine._handleError = function(reason, ex) {
if (DWREngine._errorHandler) {
DWREngine._errorHandler(reason, ex);
}
};




DWREngine._handleMetaDataError = function(handlers, reason, ex) {
if (handlers && typeof handlers.errorHandler == "function") {
handlers.errorHandler(reason, ex);
}
else {
DWREngine._handleError(reason, ex);
}
};




DWREngine._addSerializeFunctions = function() {
Object.prototype.dwrSerialize = DWREngine._serializeObject;
Array.prototype.dwrSerialize = DWREngine._serializeArray;
Boolean.prototype.dwrSerialize = DWREngine._serializeBoolean;
Number.prototype.dwrSerialize = DWREngine._serializeNumber;
String.prototype.dwrSerialize = DWREngine._serializeString;
Date.prototype.dwrSerialize = DWREngine._serializeDate;
};




DWREngine._removeSerializeFunctions = function() {
delete Object.prototype.dwrSerialize;
delete Array.prototype.dwrSerialize;
delete Boolean.prototype.dwrSerialize;
delete Number.prototype.dwrSerialize;
delete String.prototype.dwrSerialize;
delete Date.prototype.dwrSerialize;
};








DWREngine._serializeAll = function(batch, referto, data, name) {
if (data == null) {
batch.map[name] = "null:null";
return;
}

switch (typeof data) {
case "boolean":
batch.map[name] = "boolean:" + data;
break;

case "number":
batch.map[name] = "number:" + data;
break;

case "string":
batch.map[name] = "string:" + encodeURIComponent(data);
break;

case "object":
if (data.dwrSerialize) {
batch.map[name] = data.dwrSerialize(batch, referto, data, name);
}
else if (data.nodeName) {
batch.map[name] = DWREngine._serializeXml(batch, referto, data, name);
}
else {
if (DWREngine._warningHandler) {
DWREngine._warningHandler("Object without dwrSerialize: " + typeof data + ", attempting default converter.");
}
batch.map[name] = "default:" + data;
}
break;

case "function":

break;

default:
if (DWREngine._warningHandler) {
DWREngine._warningHandler("Unexpected type: " + typeof data + ", attempting default converter.");
}
batch.map[name] = "default:" + data;
break;
}
};


DWREngine._lookup = function(referto, data, name) {
var lookup;

for (var i = 0; i < referto.length; i++) {
if (referto[i].data == data) {
lookup = referto[i];
break;
}
}
if (lookup) {
return "reference:" + lookup.name;
}
referto.push({ data:data, name:name });
return null;
};


DWREngine._serializeObject = function(batch, referto, data, name) {
var ref = DWREngine._lookup(referto, this, name);
if (ref) return ref;

if (data.nodeName) {
return DWREngine._serializeXml(batch, referto, data, name);
}


var reply = "Object:{";
var element;
for (element in this)  {
if (element != "dwrSerialize") {
batch.paramCount++;
var childName = "c" + DWREngine._batch.map.callCount + "-e" + batch.paramCount;
DWREngine._serializeAll(batch, referto, this[element], childName);

reply += encodeURIComponent(element);
reply += ":reference:";
reply += childName;
reply += ", ";
}
}

if (reply.substring(reply.length - 2) == ", ") {
reply = reply.substring(0, reply.length - 2);
}
reply += "}";

return reply;
};


DWREngine._serializeXml = function(batch, referto, data, name) {
var ref = DWREngine._lookup(referto, this, name);
if (ref) {
return ref;
}
var output;
if (window.XMLSerializer) {
var serializer = new XMLSerializer();
output = serializer.serializeToString(data);
}
else {
output = data.toXml;
}
return "XML:" + encodeURIComponent(output);
};


DWREngine._serializeArray = function(batch, referto, data, name) {
var ref = DWREngine._lookup(referto, this, name);
if (ref) return ref;

var reply = "Array:[";
for (var i = 0; i < this.length; i++) {
if (i != 0) {
reply += ",";
}

batch.paramCount++;
var childName = "c" + DWREngine._batch.map.callCount + "-e" + batch.paramCount;
DWREngine._serializeAll(batch, referto, this[i], childName);
reply += "reference:";
reply += childName;
}
reply += "]";

return reply;
};


DWREngine._serializeBoolean = function(batch, referto, data, name) {
return "Boolean:" + this;
};


DWREngine._serializeNumber = function(batch, referto, data, name) {
return "Number:" + this;
};


DWREngine._serializeString = function(batch, referto, data, name) {
return "String:" + encodeURIComponent(this);
};


DWREngine._serializeDate = function(batch, referto, data, name) {
return "Date:" + this.getTime();
};


DWREngine._unserializeDocument = function(xml) {
var dom;
if (window.DOMParser) {
var parser = new DOMParser();
dom = parser.parseFromString(xml, "text/xml");
if (!dom.documentElement || dom.documentElement.tagName == "parsererror") {
var message = dom.documentElement.firstChild.data;
message += "\n" + dom.documentElement.firstChild.nextSibling.firstChild.data;
throw message;
}
return dom;
}
else if (window.ActiveXObject) {
dom = DWREngine._newActiveXObject(DWREngine._DOMDocument);
dom.loadXML(xml);

return dom;
}








else {
var div = document.createElement('div');
div.innerHTML = xml;
return div;
}
};





DWREngine._newActiveXObject = function(axarray) {
var returnValue;
for (var i = 0; i < axarray.length; i++) {
try {
returnValue = new ActiveXObject(axarray[i]);
break;
}
catch (ex) {
}
}
return returnValue;
};


if (typeof window.encodeURIComponent === 'undefined') {
DWREngine._utf8 = function(wide) {
wide = "" + wide;
var c;
var s;
var enc = "";
var i = 0;
while (i < wide.length) {
c = wide.charCodeAt(i++);

if (c >= 0xDC00 && c < 0xE000) continue;
if (c >= 0xD800 && c < 0xDC00) {
if (i >= wide.length) continue;
s = wide.charCodeAt(i++);
if (s < 0xDC00 || c >= 0xDE00) continue;
c = ((c - 0xD800) << 10) + (s - 0xDC00) + 0x10000;
}

if (c < 0x80) {
enc += String.fromCharCode(c);
}
else if (c < 0x800) {
enc += String.fromCharCode(0xC0 + (c >> 6), 0x80 + (c & 0x3F));
}
else if (c < 0x10000) {
enc += String.fromCharCode(0xE0 + (c >> 12), 0x80 + (c >> 6 & 0x3F), 0x80 + (c & 0x3F));
}
else {
enc += String.fromCharCode(0xF0 + (c >> 18), 0x80 + (c >> 12 & 0x3F), 0x80 + (c >> 6 & 0x3F), 0x80 + (c & 0x3F));
}
}
return enc;
}

DWREngine._hexchars = "0123456789ABCDEF";

DWREngine._toHex = function(n) {
return DWREngine._hexchars.charAt(n >> 4) + DWREngine._hexchars.charAt(n & 0xF);
}

DWREngine._okURIchars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789_-";

window.encodeURIComponent = function(s)  {
s = DWREngine._utf8(s);
var c;
var enc = "";
for (var i= 0; i<s.length; i++) {
if (DWREngine._okURIchars.indexOf(s.charAt(i)) == -1) {
enc += "%" + DWREngine._toHex(s.charCodeAt(i));
}
else {
enc += s.charAt(i);
}
}
return enc;
}
}


if (typeof Array.prototype.splice === 'undefined') {
Array.prototype.splice = function(ind, cnt)
{
if (arguments.length == 0) {
return ind;
}
if (typeof ind != "number") {
ind = 0;
}
if (ind < 0) {
ind = Math.max(0,this.length + ind);
}
if (ind > this.length) {
if (arguments.length > 2) {
ind = this.length;
}
else {
return [];
}
}
if (arguments.length < 2) {
cnt = this.length-ind;
}

cnt = (typeof cnt == "number") ? Math.max(0, cnt) : 0;
removeArray = this.slice(ind, ind + cnt);
endArray = this.slice(ind + cnt);
this.length = ind;

for (var i = 2; i < arguments.length; i++) {
this[this.length] = arguments[i];
}
for (i = 0; i < endArray.length; i++) {
this[this.length] = endArray[i];
}

return removeArray;
}
}


if (typeof Array.prototype.shift === 'undefined') {
Array.prototype.shift = function(str) {
var val = this[0];
for (var i = 1; i < this.length; ++i) {
this[i - 1] = this[i];
}
this.length--;
return val;
}
}


if (typeof Array.prototype.unshift === 'undefined') {
Array.prototype.unshift = function() {
var i = unshift.arguments.length;
for (var j = this.length - 1; j >= 0; --j) {
this[j + i] = this[j];
}
for (j = 0; j < i; ++j) {
this[j] = unshift.arguments[j];
}
}
}


if (typeof Array.prototype.push === 'undefined') {
Array.prototype.push = function() {
var sub = this.length;
for (var i = 0; i < push.arguments.length; ++i) {
this[sub] = push.arguments[i];
sub++;
}
}
}


if (typeof Array.prototype.pop === 'undefined') {
Array.prototype.pop = function() {
var lastElement = this[this.length - 1];
this.length--;
return lastElement;
}
}