JSON, SAP & other AJAX stuff related.

Question

Hi everyone,
Guess what, JavaScript is hot again, if you wanna be a cool kid, you got use it, do some and let everybody know
You’re on it. Lucky you’all I’ve been checking out what
you have to do to be a fashionable BSP developer.
First you want a JavaScript to be easiest to program, and
you want  more advanced functions. Then you just need
prototype (http://prototype.conio.net/).
It brings JavaScript shortcuts and function
like $(myId) instead of document. getElementbyId(myId),
iterator functions, full browser independant Ajax handler and more….
Another good one would be script.aculo.us more UI oriented (http://script.aculo.us/).
If you want light pages you got a problem, those library
can be as big as 60 k, that’s when JSMIN comes handy
(http://www.crockford.com/javascript/jsmin.html ).
It can divide your script size by at least 2. And if it is
still too big, some clients like IE, Firefox or Opera
handle gzip compression for your js and css files.
Now you have to forget everything about XML, XML is bad.
Satan is behind anyway. Look at JSON then, because you
always wanted, to have a way to describe an object in a
text and parse directly into a javaScript Object  right
A JSON is like  :
“myobject” : { “id” : ”0000”, “name” :  “john”}
}[/code]
In XML you would do :
[/code]
With the JSON parser script (http://www.json.org/json.js),
you will just do as simple as :
Var json_txt  = '{';
json_txt  +=  '"myobject" : { "id" : "0000", "name" :  "john"}';
json_txt  += '}';
/code
if you use the parser, it will and you will have a nice
JavaScript object.
Here is a little sample from what you can do with all that
(very basic, but it shows you how it works) :
Create 2 pages in a BSP application.
Display.htm et data.htm.
In display.htm just do a basic page
[/code]
json.js is the json parser script http://www.json.org/json.js
prototype.js http://prototype.conio.net/dist/prototype-1.4.0.tar.gz
my_handler.js (script to handle the page that you will do
later)
in data.htm
Gather some data from a random table and create some json
text like this :
<%@page language="abap" %>
<%
  DATA I_dude     TYPE zdude.
  data w_dude type line of Zdude.
  data w_str type string.
  CLEAR I_dude.
  *get data from the table I_dude
  select * into table i_dide
  from zdude.
*create the json text into the string w_str
  concatenate
  w_str '{ "dude": ['
  into w_str.
  data i type i.
  i = 0.
  loop at i_bdude into w_dude.
  if i gt 0.
        concatenate
      w_str ','
      into w_str.
  endif.
  concatenate
  w_str '{'
          '"objid":"' w_dude-objid '",'
          '"name":"' w_dude-name '"'
  into w_str.
  i = i + 1.
  endloop.
  concatenate
  w_str '] }'
  into w_str.
*display the string w_str
%>
<%= w_str%>
/code
You will construct a text that describe an object dude
from the table zdude .
Now create a mime object called my_handler.js
// a controller object that help us with a nice  window to display a log
var Controller =
     Controller.console.innerHTML += (message + "
// what you execute when you run the page display.htm (look at the body tag)
function Initialise() {
          var url = 'data.htm';
          var pars=””;
//call the data.htm page to get our json object Ajax object comes from prototype
var myAjax = new Ajax.Request( url, { method: 'post', parameters: pars, onComplete: showResponse });
function showResponse(req) {
var myObject = JSON.parse(req.responseText);
displayDude(myObject);
function displayDude(dude) {
     //$ is cool isn’t it
     var divDude = $(“dudeid”);
divDude.innerHtml = « » ;
//each comes from prototypes too
dude.besoin.each(function(d){ divDude.innerHtml += d.name})
}[/code]
Save everything and you will have to your first AJAX JSON
application
Hope you enjoyed the ride and that I’ve been clear enough
Read, comment, say something
Have great Day
Quentin.
Web site the I use to build that post :
AJAX tutorials :
     http://snyke.net/blog/2006/03/25/site-design-using-prototype/
http://snyke.net/blog/2006/02/05/ajax-design-patterns/
JSON related :
     www.json.org
     http://www.sergiopereira.com/articles/prototype.js.html

Answer 1

This seems interesting.  However it is a bit unusal for us to see content like this posted into the forums.  To be honest at first glace I mistook it for some SPAM Posting advertising some 3rd party tool - which on closer inspection is not the case.
Have you considered creating this same content as weblog and posting it within SDN.  This is generally where you would find this type of "article".  In the SDN Weblog area, you can classify your topic under BSP. We also have a sticky forum thread for any new BSP related weblog anouncements. 
If you need any help getting started on a weblog, feel free to ask for help from one of the SDN Community managers or one of your fellow SDN BSP contributors (myself included).