/*
DynAPI Distribution
IOElement Class
The DynAPI Distribution is distributed under the terms of the GNU LGPL license.
requires: dynapi.api.DynLayer
// pages loaded must include this code:
<script>
if (parent.dynapi) parent.IOElement.notify(this);
</script>
*/
function IOElement(hiddenThreads,useXFrames) {
this.DynLayer = DynLayer;
this.DynLayer();
this._elmID = this.id+'elm';
this._requests = {}; // [url,data,fn,method,elmThread,timer,cargo]
this._cargoID='';
this._requestList = [];
this._requestIndex = -1;
this._retryID=null;
this._transactions = {};
this._singleThread=false;
this._elmBusy=[];
this._elmThread=null;
this._maxThreads=(hiddenThreads>=1 && hiddenThreads<=8)? hiddenThreads : 1;
this._hidden = (hiddenThreads)? true : false;
this.isSync=false;
this.failTime = 50000;
// create XFrame window
if(useXFrames && dynapi.ua.ns4) {
this._winXFrames=window.open("about:blank",null,'left=3000,top=3000,width=100,height=100,scrollbars=no,status=no,toolbar=no');
this._winXFrames.blur(); // hide the new window
var wxf=this._winXFrames;
dynapi.onUnload(function() { // tidy up
if(wxf.open && !wxf.closed) wxf.close();
});
}
if (this._hidden) {
var o = this;
o.setLocation(1,1);// Strange! ns4 requires that the x,y be set in order to load the java applet inside the layer
o.setVisible(false);
dynapi.document.addChild(o);
}
this.onPreCreate(IOElement.fnPrecreate);
this.onCreate(IOElement.fnCreate);
};
IOElement.fnPrecreate = function() {
var t,r=['*'],html=[];
if (this._hidden) {
if (this._winXFrames) html = ['<frame src="about:blank" name="',this._elmID,'" scrolling="none">'];
else if (dynapi.ua.ns4) html = ['<ilayer name="',this._elmID,'" visibility="hide" width=0 height=0></ilayer>'];
else {
// Opera v7.11 requires an IFrame's src to be set before it's accessible - pixel.gif is a 1x1 transparent gif
html = ['<iframe name="',this._elmID,'" src="'+dynapi.library.path+'gui/images/pixel.gif" style="width:0px; height:0px; visibility:hidden"></iframe>'];
}
t=html.join('');
this._elmThread=this._elmID;
this._elmBusy[this._elmID]=false;
for(var i=1;i<this._maxThreads;i++){ // setup additional threads
r[i]='*';// for XFrames
html[1]=this._elmID+'x'+i;
t+=html.join('');
this._elmBusy[this._elmID+'x'+i]=false; // flag as not busy
}
// java-sync frame
html[1]=this._elmID+'Sync';
t+=html.join('');
}else{
if (this._winXFrames) t = '<frame src="about:blank" name="',this._elmID,'" scrolling="none">';
else if (dynapi.ua.ns4) t = '<ilayer width='+this.w+' height='+this.h+' name="'+this._elmID+'" visibility="inherit"></ilayer>';
else t = '<iframe name="'+this._elmID+'" width='+this.w+' height='+this.h+' scrolling="no" frameborder="no" marginwidth=0 marginheight=0 style="overflow:hidden;"></iframe>';
this._elmThread=this._elmID; this._elmBusy[this._elmID]=false;
}
if (!this._winXFrames) this.html=t;
else{
var src='<html><head><title>DynAPI XFrame</title></head>\n'
+'<frameset rows="'+r.join(',')+',0">\n'+t
+'</frameset></html>\n'
this._winXFrames.document.open();
this._winXFrames.document.write(src);
this._winXFrames.document.close();
this._winXFrames.top.dynapi=dynapi;
this._winXFrames.top.IOElement=IOElement;
}
};
IOElement.fnCreate = function() {
if (this._SyncFn) window.setTimeout(this+'._initSync()',100);
if (this.getScope()) {
if (this._requestList.length>0) {
this._setRequestTimeout(100);
}
}
};
var p = dynapi.setPrototype('IOElement','DynLayer');
p.execInParent = function(fn){ // Executes javascript codes within the parent element
if(typeof(fn)=='function') eval('fn='+fn);
else eval('fn=function(){'+fn+'}');
fn();
};
p.getVariable = function(name) {
var v=this.getScope()[name];
if (IOElement.SODA) v=IOElement.ws_SODA2Var(v);
return v;
};
p.getScope = function(thread) {
var scope;
if (!thread) thread=this._elmThread;
if (this._winXFrames && this._winXFrames.top) scope = this._winXFrames.top.frames[thread];
else if (dynapi.ua.ns4) scope = this.doc.layers[thread];
else scope = window.frames[thread];
if (!scope) return alert('IOElement Error: no load element');
else return scope;
};
p.getCargoID=function(){return this._cargoID}
p.getCargo=function(dontRemove){
if(!this._cargoID) return null;
var c=this._requests[this._cargoID][6];
if(!dontRemove) {
// normal cargo are removed from storage
this._requests[this._cargoID][6]=null;
}
return c;
};
p.isBusy = function(){
for (var i in this._elmBusy){
if (this._elmBusy[i]==false) return false;
};return true;
};
p.cancel= function(id){
id=(id)? id:this._retryID;
var req=this._requests[id];
if(req){
this._elmBusy[req[4]]=false;
delete this._requests[id];
this._clearScope();
return true;
}
};
p.cancelAll=function(){
this._requests={};
for (var i in this._elmBusy){
this.elmThread=i;
this._clearScope();
}
};
p.retry=function(id){
id=this._retryID=((id)? id:this._retryID);
var req=this._requests[id];
if(req) {
this._setRequestTimeout(50,id);
return true;
}
};
p.setTimeout = function(ms){
if(!isNaN(ms))this.failTime=ms;
}
p.useSingleThread = function(b){
this._singleThread=b;
};
p.get = function(url,data,fn,cargo) {
if(fn==false && this.isSync) return this._syncRequest(url,data,'get');
else return this._asyncRequest(url,data,fn,'get',cargo);
};
p.post = function(url,data,fn,cargo) {
if(fn==false && this.isSync) return this._syncRequest(url,data,'post');
return this._asyncRequest(url,data,fn,'post',cargo);
};
p.upload=function(url,form,fn,cargo){ // file upload
return this._asyncRequest(url,form,fn,'upload',cargo);
};
p._asyncRequest = function(url,data,fn,method,cargo) {
var i,l,src;
var id = this._getRandomID(); // create random load ID to ensure no caching
dynapi.debug.print("IOElement "+method+" request");
if (typeof(url)=="string") this._requests[id] = [url,data,fn,method,null,null,cargo];
else if (method=="get") {
for (i=0;i<url.length;i++) { // support loading several files, attach handler to last file
src = url[i];
if (i<url.length-1) this._requests[id] = [src,null,null,method,null,null,cargo];
else this._requests[id] = [src,data,fn,method,null,null];
}
}
l=this._requestList.length;
this._requestList[l] = id;
if (this._created) this._setRequestTimeout(20);
return id;
};
p._doRequest = function(id) {
if (this.isBusy()) {this._setRequestTimeout(200,id);return;}
else {
if (this._requestIndex<this._requestList.length-1 || id) {
if(!id){ // <- direct request - used by the retry() method
this._requestIndex++;
id = this._requestList[this._requestIndex];
}
var i,t,cont=false;
var r = this._requests[id];
if(r) {
var url = r[0];
var data = r[1];
var fn = r[2];
var method = r[3];
var elm = this._getFreeElm();
cont=(elm)? true:false;
}
if(!cont) {
this._setRequestTimeout(200,id);
return;
}
r[4]=this._elmThread;
if (url.indexOf('http')!=0) {
if (url.substr(0,1)=='/') url = 'http://'+dynapi.frame.document.domain+url;
else url = dynapi.documentPath+url;
}
url += (url.indexOf('?')==-1)? '?' : '&';
url += 'IORequestID='+id+'&IOElementID='+this.id+'&IOMethod='+method;
t=this+'._notify("'+id+'","'+url+'",false)';
// add eval code to transaction records
if(!dynapi.ua.ns4) this._transactions[id]=[0,t];
r[5] = window.setTimeout(t,this.failTime);
// reset document - this will help to prevent cross-domain access errors
if (dynapi.ua.def) elm.document.location.href = 'about:blank';
if (method=="get" || (dynapi.ua.ns4 && !this._winXFrames)) {
if (data) {
for (i in data) {
if(i) url += '&'+i+'='+escape(data[i]);
}
}
if (this._winXFrames) elm.location.href=url;
else if (dynapi.ua.ns4) elm.src = url;
else elm.document.location.href = url;
}else if(method=='upload') {
var f=data;
f.action=url;
f.encoding='multipart/form-data';
f.method='post';
f.target=this._elmThread;
f.submit();
}else {
var str = '<html><body><form name="ioDataForm" action="'+url+'" method="post" enctype="application/x-www-form-urlencoded">';
if (data) {
for (i in data) {
if(i) str += '<input name="'+i+'" type="hidden">';
}
}
str += '</form></body></html>';
elm.document.open();
elm.document.write(str);
elm.document.close();
var f = elm.document.forms['ioDataForm'];
if (!f) return alert("IOElement Error: no form element found");
if (f && data) {
for (i in data) {
if(i) f[i].value = data[i];
}
}
f.submit();
}
// begin transaction - data sent but awaiting reply
// to-do work on a way to detech if caller is in the same domain as
if(!dynapi.ua.ns4) {
elm.document._tranState="begin";
this._monitorTransactions();
}
this.invokeEvent("request");
}
}
};
p._clearScope=function(){
var doc=this.getScope().document;
if(doc){doc.open();doc.write('');doc.close()}
};
p._getFreeElm= function(){
for (var i in this._elmBusy){
if (this._elmBusy[i]==false){
this._elmThread=i;this._elmBusy[i]=true;
return this.getScope();
}else if(this._singleThread) break;
}
};
p._getRandomID = function(){
var id = Math.random()+'';
return 'io'+id.substring(2);
};
p._monitorTransactions = function(){
var c,r,tr,id,elm;
for (id in this._transactions){
r=this._requests[id];
tr=this._transactions[id];
if(r && this._elmBusy[r[4]]) {
elm=this.getScope(r[4]);
if(elm && elm.document && !elm.document._tranState){
// document completed without proper response from server
tr[0]+=1; // counter.
if(tr[0]>=3){
//three strikes and you're out!
eval(tr[1]);
}
}
}
}
if(id) window.setTimeout(this+'._monitorTransactions()',1000);
};
p._notify = function(id, url, success) {
var fn,req=this._requests[id]; if(!req)return;
var s = (success!=null)? success : true;
// delete transaction record
delete this._transactions[id];
if (!this._elmBusy[req[4]] && success) {
dynapi.debug.print('IOElement Error: '+id+' '+this._elmID+' '+url);
return;
}
clearTimeout(req[5]);
this._elmThread=req[4];
fn = req[2]; // callback function
if(!s) this._retryID=id; else this._retryID='';
this._cargoID=id;
if (fn) {
var r,e = new DynEvent("load",this);
if(typeof(fn)=='function') r=fn(e, s);
else r=eval(fn);
// cancels server response and preserve request object
if(r==false) {
s=false;
this._retryID=id;
}
}else{
this.invokeEvent("response",null,s);
}
this._cargoID='';
if(s && id!=this._retryID) delete this._requests[id];
else if(this._hidden) this._clearScope();
this._elmBusy[req[4]] = false;
// release document - prevent incomplete progressbar in ie
if(dynapi.ua.ie) location.href = "javascript:void (document.close())";
this._doRequest();
};
p._setRequestTimeout=function(interval,id){
var evl=this+'._doRequest('+((id)? "'"+id+"'":'')+')';
return window.setTimeout(evl,interval);
};
// Helper Methods -------------------------
IOElement.getSharedIO=function(useXFrames){ // Returns a Shared instance of the IOElement object
if(!IOElement.ShareIO) IOElement.ShareIO=new IOElement(1,useXFrames);
return IOElement.ShareIO;
};
IOElement.notify = function(elm, fn, success) { // ds: added success parameter to nicely relay server generated error messages
if (elm) {
var url, id;
if (dynapi.ua.ns4 && elm.src) url = elm.src;
else if (dynapi.ua.ns4 && elm.location) url = elm.location.href;
else url = elm.document.location.href;
if (url) {
elm.args = dynapi.functions.getURLArguments(url);
var id = elm.args["IORequestID"];
var obj = DynObject.all[elm.args["IOElementID"]];
if (obj!=null && id!=null) {
// transaction completed - server has respond sucessfully
elm.document._tranState="complete";
elm.onload = function() {
if (fn) fn(obj); // send obj fn - rmo
obj._notify(id,url, success); // ds: success
};
return obj;
}
else {
return false;
}
}
}
return null;
};
IOElement.URLEncode = function (d){
d=d.replace(/\s/g,'+').replace(/\%/g,'%25').replace(/\=/g,'%3D');
d=d.replace(/\&/g,'%26').replace(/\n/g,'%0A').replace(/\r/g,'%0D');
d=d.replace(/\#/g,'%23').replace(/\\/g,'%5C');
return d;
};