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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