If I understand your code correctly, its actually doing exactly what you've
asked it to do.
You are calling a method called 'setCurrentBook(......))' which doesn't seem to
do anything very much.
You are then defining a callback 'public void setCurrentBook(String bookname)'
blah...
You are then *invoking* the call back
bookServicesHolder.loadBookByName(bookName, callback);
Your call back sets a variable called 'currentBook' and I cannot see what you intend this to do from
the code provided, but, as written, its not going to do anything very much. If if is a global
variable then you will never get the result you require.
You need to carefully re-read the section in the GWT docs about Asynchronous calls. If you are using
GWT you *MUST* use and fully understand asynchronous RPC - that's what Ajax is all about.
It *should* go something like this.
* Define an RPC callback for a particular service typically by using an
anonymous inner class.
* Invoke the call back specifying the data object (book) you want to read
* On the successful asynchronous return, update the UI, by calling the update method from within the
callback onSuccess method. There are many, many examples out there.
In short, don't update the UI until the callback returns.
If you don't want to make these calls asynchronous, then convert your program to a more
servlet-centric approach. There are a (large) number of other web frameworks which will do this for
you. GWT is all about Ajax and RPC.
HTH
Alan
On 1/3/2011 12:17 PM, Cesar Ruiz wrote:
It is also saving more books when reloading the page (but I dont care much about it as that wont
be too painful to fix). But please I need some help on the RCP asyncronous calls. What workaround
can I do?.
Kido.
On 3 January 2011 19:23, Kidowell <crui...@gmail.com
<mailto:crui...@gmail.com>> wrote:
Hello, I'm doing a project where in the interface shows a listBox that
includes the names of some books, the thing is that you must choose
one and you will look wether in pdf or txt. My problem is that when
changing the listbox, itll show the just last book you chose, rather
the current one.
heres the program so far.
http://kido180020783.appspot.com/
Here's the part of the code that presents the problem.
setCurrentBook(bookList.getItemText(bookList.getSelectedIndex()));
if (pdfFlag) {
if (!txtFlag) {
pdfBook.setSize(booksPanelWidth,
booksPanelHeight);
} else {
booksPanelWidth =
String.valueOf(BOOKS_PANEL_WIDTH / 2);
pdfBook.setSize(booksPanelWidth,
booksPanelHeight);
txtBook.setSize(booksPanelWidth,
booksPanelHeight);
}
pdfBook.setUrl("pdf/" + currentBook.getUriPath() +
".pdf");
} else {
......
//This method is being called AFTER the line " pdfBook.setUrl("pdf/" +
currentBook.getUriPath() + ".pdf");" wich is weird!!!!!!.
public void setCurrentBook(String bookName) {
AsyncCallback<Book> callback = new AsyncCallback<Book>() {
public void onFailure(Throwable caught) {
throw new UnsupportedOperationException("Not supported
yet.");
}
public void onSuccess(Book result) {
currentBook = result;
}
};
bookServicesHolder.loadBookByName(bookName, callback);
}
I dont want the method to be Asyncronous, please I really need some
help.
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