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Article: Breaking OpenLaszlo loose from XML data

OpenLaszlo logoTheServerSide published my article that explains how to uses OpenLaszlo with non-XML data, most notably JSON. It contains a short self-contained example of how to asynchronously retrieve the data, without triggering the XML parsing routines.

Currently this is still primitive since it doesn't tie into the data-binding infrastructure. There are however plans for the dataset facility to be better abstracted, creating a uniform approach to interacting with structured data. Until then you're still able to explicitly update the view elements that you need by applying the techniques that are outlined in this article.

Read the article here.
posted by Geert Bevin in Laszlo on Mar 31, 2007 6:27 PM : 5 comments [permalink]
 

Comments
Re: Article: Breaking OpenLaszlo loose from XML data
Is OpenLaszlo really using SOJO (http://sojo.sourceforge.net/) for transform Java Objects to JSON?
posted by Mario Linke on Apr 5, 2007 10:46 PM
Re: Article: Breaking OpenLaszlo loose from XML data
No, it's not, I just use that in the example for the article.
posted by Geert Bevin on Apr 6, 2007 12:12 AM
Re: Article: Breaking OpenLaszlo loose from XML data
hi Geert ,

I just translate your article into Chinese at http://www.blogjava.net/rosen/archive/2007/04/07/109145.html .
In your article, you mentioned that "I'm staying away from the server-side Java technology debate and assume that your framework of choice is able to output text with the text/plain mime-type."
can you explain how does it work, how to output TRUE text/plain mime-type? I have tried in JSP&Servelt but failed.

best regards!
rosen jiang
posted by rosen jiang on Apr 8, 2007 3:28 PM
Re: Article: Breaking OpenLaszlo loose from XML data

Hi Rosen,

thanks a lot for the translation. Here is a simple servlet that just prints out plain text with the text/plain mime-type:

public class SampleServlet extends HttpServlet {
  public void doGet(HttpServletRequest request, HttpServletResponse response)
      throws IOException {
    response.setContentType("text/plain");
    PrintWriter out = response.getWriter();
    out.print("plain text\n");
  }  
}

Hope this helps.

Best regards,

Geert
posted by Geert Bevin on Apr 8, 2007 5:52 PM
Re: Article: Breaking OpenLaszlo loose from XML data
hi Geert,

I have tried the same code yesterday like you post.

my.RifeJsonService rs = new my.RifeJsonService();
response.setContentType("text/plain");
PrintWriter out = response.getWriter();
out.print(rs.processElement().toString());
out.flush();
out.close();

Method rs.processElement() output {"age":32,"~unique-id~":"0","name":"Geert Bevin","class":"my.Person"}
That's right, and in Explorer, outputting the same result, perfect!
But in the responseText of XMLHttpRequest that is:

<resultset>
<body>
{"age":32,"~unique-id~":"0","name":"Geert Bevin","class":"my.Person"}</body>
<headers>
<header name="Date" value="Mon, 09 Apr 2007 13:02:28 GMT" /><header name="Server" value="Apache-Coyote/1.1" /></headers></resultset>

So, JSON can't understand above responseText. I don't konw what happened, i use Tomcat 5.0.28

Thanks alot. :)

best regards!
rosen jiang
posted by rosen jiang on Apr 9, 2007 3:10 PM

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