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POJavaScript: xmlhttprequest request and server answer
 

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    <p>I'm starting off with js. I want to fetch data from a server with xml. I wonder how to send a request as, and get an anser in xml through javascript functions. It says I need a POST-Request and send an xml in the form:</p> <pre><code> &lt;?xml version="1.0" encoding="UTF-8"?&gt; &lt;ft&gt; &lt;request clientId="123" apiName="api_search_location_stops_nearby" apiVersion="2.0"&gt; &lt;client clientId="123"/&gt; &lt;requestType&gt;api_search_location_stops_nearby&lt;/requestType&gt; &lt;outputCoords&gt;WGS84&lt;/outputCoords&gt; &lt;fromCoordName&gt;WGS84&lt;/fromCoordName&gt; &lt;fromType&gt;coords&lt;/fromType&gt; &lt;fromWgs84Lat&gt;48.22&lt;/fromWgs84Lat&gt; &lt;fromWgs84Lon&gt;16.39&lt;/fromWgs84Lon&gt; &lt;/request&gt; &lt;/ft&gt; </code></pre> <p>To then get an xml answer. It has 2 or 3 nodes in it, which I'm interested in. From there on, it'll be no big deal.</p> <p>It is all about a strange API from the vienna public transport company: <a href="http://akirk.github.io/Wiener-Linien-API/" rel="nofollow">http://akirk.github.io/Wiener-Linien-API/</a> I basically want to get (open)data from them.</p> <p>Here: <a href="https://techscreen.tuwien.ac.at/node/794" rel="nofollow">https://techscreen.tuwien.ac.at/node/794</a> I found a solution for php.. </p> <p>My try:</p> <pre><code> // Bare bones XML writer - no attributes function xmlElement(name,content){ var xml if (!content){ xml = '&lt;' + name + '&gt;' + '&lt;/' + name + '&gt;' } else { xml = '&lt;'+ name + '&gt;' + content + '&lt;/' + name + '&gt;' } return xml } function sendRequest() { var xmlReq xmlReq = "&lt;?xml version=\"1.0\" encoding=\"UTF-8\"?&gt;"; xmlReq = xmlReq + "&lt;ft&gt;"; xmlReq = xmlReq + "&lt;request clientId=\"123\" apiName=\"api_get_monitor\" apiVersion=\"2.0\"&gt;"; xmlReq = xmlReq + "&lt;client clientId=\"123\"/&gt;"; xmlReq = xmlReq + xmlElement("requestType", "api_get_monitor"); xmlReq = xmlReq + xmlElement("monitor", xmlElement("outputCoords", "WGS84") + xmlElement("type","stop") + xmlElement("name","60201040") + xmlElement("year","2013") + xmlElement("month","10") + xmlElement("day","3") + xmlElement("hour","8") + xmlElement("minute","0") + xmlElement("line") + xmlElement("sourceFrom","stoplist") ); xmlReq = xmlReq + "&lt;/request&gt;" + "&lt;/ft&gt;"; text1.text = xmlReq; var xhr = new XMLHttpRequest(); xhr.onload = handleRequest; xhr.open("POST", "http://webservice.qando.at/2.0/webservice.ft"); // POST or GET xhr.send(xmlReq); // xhr.responseXML // this is allways null } function handleRequest(answer) { console.log(answer.responseType); console.log(answer.responseXML); } </code></pre> <p>The core points of my question: On my code, should there be GET or POST? Is the request built up to fit the style above (or do I need linebreaks or convert to a DOM xml thing)? How does the recieving thing work. Am I doing this right? Should the variable answer then contain the xml with the answer?</p> <p>This code is somehow not working. I printed the xml-string to the console and it looks just like above (without linebreaks). But the handleRequest function doesn't print anything (it is not called at all).</p> <p>Thanks in advance!</p>
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    1. CO1) If it says you should use POST, then use POST. 2) Yes. You cannot get a response before requesting it. 3) Build the XML by concatenating strings. 4) Then send the XML string in that `postData` variable.
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    2. CO<<< _2) Yes. You cannot get a response before requesting it._ **+1**
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      1. USLapsio
 

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