Re: Equivalent JavaScript pattern in GWT

2011-07-21 Thread Ionuț G. Stan 

On Jul/20/2011 19:25, Jeff Chimene wrote:

You've got to expose DB_DATA to Java for this to work.
Maybe use Javascript overlays
(http://code.google.com/webtoolkit/doc/latest/DevGuideCodingBasicsOverlay.html),
and call out to Java from JSNI instead of referencing DB_DATA
directly. I write directly since there's more hand-written code
involved than what actually executes.


Thanks a lot. The link you mentioned seem to be exactly what I need.

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Equivalent JavaScript pattern in GWT

2011-07-20 Thread Ionuț G. Stan 

Hi,

Whenever I'm working in JS, I find myself times and times again using a 
certain pattern in order to avoid an extra call to the server. I dump 
into the web page a JSON object (serialized by the server) inside a 
SCRIPT tag that is then interpreted by the browser as part of the normal 
flow. The alternative would be to make an additional Ajax request, which 
is unnecessary form my point of view.


For example:

script
var DB_DATA = {
   users: ?php echo json_encode(fetch_users_from_db()); ?
};

window.onload = function () {
   // disp
   display_users(DB_DATA.users);

   refreshButton.onclick = function () {
 fetch_users_from_server(function (users) {
   display_users(users);
 });
   };
};
/script


As far as my GWT knowledge goes, I can do the same thing in GWT using 
JSNI, with something like this:


public native void displayUsers()/* {
  display_users(DB_DATA.users);
} */;

However, I was wondering if there's some GWT specific pattern, that 
would also allow some compile time checks for the presence of the 
generated JS variable (similar to how CSS files are checked to see if 
all the required CSS classes are declared).


Thanks!
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Ionuț G. Stan  |  http://igstan.ro

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Re: Equivalent JavaScript pattern in GWT

2011-07-20 Thread Jeff Chimene 
You've got to expose DB_DATA to Java for this to work.
Maybe use Javascript overlays
(http://code.google.com/webtoolkit/doc/latest/DevGuideCodingBasicsOverlay.html),
and call out to Java from JSNI instead of referencing DB_DATA
directly. I write directly since there's more hand-written code
involved than what actually executes.

On 07/19/2011 11:45 PM, Ionuț G. Stan wrote:
 Hi,
 
 Whenever I'm working in JS, I find myself times and times again using a
 certain pattern in order to avoid an extra call to the server. I dump
 into the web page a JSON object (serialized by the server) inside a
 SCRIPT tag that is then interpreted by the browser as part of the normal
 flow. The alternative would be to make an additional Ajax request, which
 is unnecessary form my point of view.
 
 For example:
 
 script
 var DB_DATA = {
users: ?php echo json_encode(fetch_users_from_db()); ?
 };
 
 window.onload = function () {
// disp
display_users(DB_DATA.users);
 
refreshButton.onclick = function () {
  fetch_users_from_server(function (users) {
display_users(users);
  });
};
 };
 /script
 
 
 As far as my GWT knowledge goes, I can do the same thing in GWT using
 JSNI, with something like this:
 
 public native void displayUsers()/* {
   display_users(DB_DATA.users);
 } */;
 
 However, I was wondering if there's some GWT specific pattern, that
 would also allow some compile time checks for the presence of the
 generated JS variable (similar to how CSS files are checked to see if
 all the required CSS classes are declared).
 
 Thanks!

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