Thanks Ben, that does help. Some of our JSP's were already using XMLHttpRequest from IE, and our servlet extracted the xml that was posted. I was trying to take the same approach and reuse the servlet code.
I was able to get it working with datasets already (doRequest() works well), and by the fact that you had suggested it, tells me that that's the approach to take. I already set up a crossdomain.xml file which fixed remote access. Thanks again, Dave -----Original Message----- From: Benjamin Shine [mailto:[EMAIL PROTECTED] Sent: Thursday, February 23, 2006 12:15 PM To: David Buchwald Subject: Re: [Laszlo-user] XMLHttpRequest and XML content Hi David -- Just a quick idea off the main list, because all I have is a suspicion and not a complete working code example: first, use datasets. They are the heart of OpenLaszlo. XMLHttpRequest is a more complicated API. Second, try building the query string yourself, not with LzParam(). I have a feeling that there's a bug somewhere in the handling of LzParam when building query strings. Also try using Live HTTP Headers or Fiddler so you can see exactly what the query is that you're submitting to the server; that way you can verify that the query is what you want it to be. Also look out for crossdomain.xml -- are you making the request on the same server that is serving up OpenLaszlo? And -- the xml that you're submitting -- is it html-escaped? Hope this helps... -ben On Feb 23, 2006, at 5:34 AM, David Buchwald wrote: > I asked a question a few days ago (sorry it got a bit > long-winded), and I'm curious if anyone had an answer. > > Basically, I POST'ed an xml payload using the XMLHttpRequest > (in the send method) to one of our servlets. I hit > the breakpoint in the servlet while debugging and the > request body is empty (content-length is 0 and the reader > in the request returns nothing). It's deployed as a > proxied server app (not SOLO). > > Here's the code - > > ... > xmlHttpRequest = new XMLHttpRequest(); > > xmlHttpRequest.onreadystatechange = processReqChange; > xmlHttpRequest.open("POST", url, true); > xmlHttpRequest.send(xmlMsg.serialize()); > > Any help would be appreciated... > > Thanks, > Dave > > -----Original Message----- > From: Dave Buchwald [mailto:[EMAIL PROTECTED] > Sent: Sunday, February 19, 2006 3:05 PM > To: [email protected] > Subject: [Laszlo-user] XMLHttpRequest and XML content > > I'm trying to integrate Laszlo with an existing servlet we > have at work (which already takes posted xml and processes > it). I'm trying 2 ways, but not being very successful. > One is with the XMLHttpRequest, and the other is with a straight > call to the doRequest on the lzDataset with an lzParam. > > here are some versions: > Tomcat 5.5 > OpenLaszlo 3.1 > > Before I start, my questions are - > 1) which is the better method, use XMLHttpRequest or use a > normal dataset and call the doRequest method? > > 2) does the XMLHttpRequest have a problem with sending content? > Or could it the fact that I'm calling a servlet outside the lps > context? I have a webapp within my Tomcat installation into > which I put the lps directory (all the Laszlo components). I'm > describing this only because I know the SOLO deployment can't > do XML posted content with XMLHttpRequest. > > 3) if there's no problem, should I be extracting the xml from the > HttpServletRequest differently? i'm trying not to change the servlet > as it is today (it now gets xml from the request). > > 4) could you release some more examples using XMLHttpRequest with > actual content? The one that's there only sets the request headers > and calls the send method with a null arg. > > I create 2 datasets - one gets the xml from a file which works fine: > <dataset name="cellStatus" src="getXml.xml" /> > > I then call loadXMLDoc(cellStatus.serialize()) and embed the xml in > the body with this: > > function loadXMLDoc(xmlMsg) { > > var url = "http://someurl:8080/context/xmlCall.srv";; > xmlHttpRequest = new XMLHttpRequest(); > xmlHttpRequest.onreadystatechange = processReqChange; > xmlHttpRequest.open("POST", url, true); > xmlHttpRequest.send(xmlMsg); > > I set a breakpoint in Eclipse on the servlet in doPost(), > and the XMLHttpRequest in fact does the POST. But the > content length is zero (and there's nothing in the request's > reader). Then when I try to get an InputSource and > parse the xml with a DOMParser, it throws an exeption. > > InputSource inputSource = new InputSource(request.getReader()); > DOMParser parser = (DOMParser)xmlParserPool.borrowObject(); > parser.parse(inputSource); > xmlDocument = parser.getDocument(); > > The other method is to create another dataset and data pointer: > > <dataset name="sendData" request="false" > src="http://localhost:8080/somecontext/xmlCall.srv";> > <datapointer xpath="sendData:/*" ondata="processData();"> > <method name="processData"> > Debug.write("Hey = " + this.getNodeName()); > Debug.write(sendData.serialize()); > </method> > </datapointer > > <button>Load Data > <method event="onclick"> > <![CDATA[ > var sd = canvas.datasets.sendData; > var param = new LzParam(); > param.addValue("lzpostbody", cellStatus.serialize(), false); > sd.setQueryString(param); > sd.setQueryType("POST"); > sd.doRequest(); > > ]]> > </method> > </button> > > When I used the builtin param "lzpostbody", the above actually took > the > xml I posted to the servlet and split it into 2 pieces - > one piece under the request param name, and the other as the param's > value > (very strange). When I used a different param name, it worked fine. > This code is very similar to what's in ajax.lz. Except it calls the > setQueryParam() method. > > thanks in advance, > Dave > > _______________________________________________ > Laszlo-user mailing list > [email protected] > http://www.openlaszlo.org/mailman/listinfo/laszlo-user > This email and any files transmitted with it are confidential and > intended solely for the use of the individual or entity to whom > they are addressed. If you have received this email in error please > notify the sender immediately. Please note that any views or > opinions presented in this email are solely those of the author and > do not necessarily represent those of the company. Even though this > company takes every precaution to ensure this email is virus-free, > the recipient should check this email and any attachments for the > presence of viruses. The company accepts no liability for any > damage caused by any virus transmitted by this email. > Protedyne Corporation, 1000 Day Hill Rd, Windsor, CT 06095, USA, > www.protedyne.com > > > _______________________________________________ > Laszlo-user mailing list > [email protected] > http://www.openlaszlo.org/mailman/listinfo/laszlo-user benjamin shine software engineer [EMAIL PROTECTED] _______________________________________________ Laszlo-user mailing list [email protected] http://www.openlaszlo.org/mailman/listinfo/laszlo-user
