Re: Asynchronous Operation question

Subject: Re: Asynchronous Operation question

From: Christian Wilmanns <email@hidden>

Date: Sun, 13 Aug 2006 21:29:35 +0200

Delivered-to: email@hidden

Hi John.

I don't quite understand the problem you seem to have, but I had a similar problem I think with my widget. The thing was that I'm sending multiple asynchronous requests and want to check, when receiving, which one I received. This I accomplished by attaching one or two variables together with the request. Excuse me for my not so good english by the way.

I found a good webpage which explains this in detail: http://www.drakware.com/articles/multijax.php

My widget queries a webpage in order to receive stock infos. I used the following function inspired by Drakware's code:

/* HTTP request object constructor and attaches some properties to it*/

function CHTTPReq(type,stockCode,httpReq) {

this.type = type;

this.stockCode = stockCode;

this.httpReq = httpReq;

}

function queryCitibank(stockCode,queryType,stockCodeURL) {

var httpReq = false;

var strURL = (stockCodeURL!=null)? stockCodeURL:'http://www.citibank.de/service/service_suche.asp?SearchType=3&SearchString='+stockCode;

httpReq=new XMLHttpRequest();

if (httpReq) {

httpReq.>

httpReq.open("GET",strURL,true);

var tmpHttpReq = new CHTTPReq(queryType,stockCode,httpReq);

httpReqs.push(tmpHttpReq);

httpReq.send(null);

}

function httpReqChange() {

if (httpReqs.length<1) return;

for (var i=0; i < httpReqs.length; i++) {

if (httpReqs[i].httpReq.readyState == 4) {

if (httpReqs[i].httpReq.status == 200 || httpReqs[i].httpReq.status == 304) {

reqResponseText = httpReqs[i].httpReq.responseText;

reqResponseType = httpReqs[i].type;

var reqResponseStockCode = httpReqs[i].stockCode;

httpReqs.splice(i,1); i--;

var processingLastReq = (httpReqs.length<1)? true:false;

switch (reqResponseType) {

case 'quote': handleStockQuote(reqResponseText,processingLastReq);

break;

case 'lookup': handleLookupSymbol(reqResponseText);

break;

case 'lookupName': handleLookupName(reqResponseText,reqResponseStockCode);

break;

case 'lookupNameMulti': lookupNameMulti(reqResponseText,reqResponseStockCode);

break;

default: handleStockQuote(reqResponseText,processingLastReq);

}

} else {

// error

}

Bye Christian

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