Re: Modal Dialog/Non-busy Wait
Window.confirm/alert is pretty much the only thing that can halt Javascript
execution.
You have to refactor your code a bit. Instead of
public boolean doPost(String url, String postData)
you should use
public void doPost(String url, String postData, Callback..., ...
callback) {
dlg.show();
builder.sendRequest(postData, new RequestCallback() {
void onError() {
dlg.hide();
callback.onFailure(...);
}
void onResponseReceived(...) {
dlg.hide();
if(statusCode == OK) {
callback.onSuccess(...);
} else {
callback.onFailure(...);
}
}
});
}
So everyone who calls your doPost() method has to provide a callback in
order to be notified when the post succeeds or fails. You have to think
asynchronous :-) The only thing that makes sense to return in that case is
the Request instance created by builder.sendRequest(...), so the calling
code can cancel the request if needed:
public Request doPost(..., Callback callback) {
dlg.show();
return builder.sendRequest(...);
}
-- J.
Am Montag, 5. September 2011 19:01:29 UTC+2 schrieb melody:
I wish to embed an asynchronous call to the server inside a method
that MUST NOT return until the server has responded. So I am looking
for a way to achieve a non-busy wait in GWT. I thought I could use a
modal popup dialog to stop the next line from being executed until the
dialog is closed and only after the response from server arrives.
Unfortunately the GWT modal dialog does not do what I thought it would
do -- which is block everything and wait at the line where the
PopupPanel.show() method is called. See method below
code
public boolean doPost(String url, String postData) {
RequestBuilder builder = new
RequestBuilder(RequestBuilder.POST, url);
final int STATUS_CODE_OK = 200;
final PopupPanel dlg = new PopupPanel();
dlg.setModal(true);
dlg.setGlassEnabled(true);
try {
builder.setHeader(Content-Type, application/x-www-form-
urlencoded);
builder.sendRequest(postData, new RequestCallback() {
public void onError(Request request, Throwable
exception) {
dlg.hide();
}
public void onResponseReceived(Request request,
Response response) {
int li_status = response.getStatusCode();
if (li_status == STATUS_CODE_OK) {
//bravo
}
dlg.hide();
}
});
builder.setTimeoutMillis(3000);
dlg.show();
return true;
} catch (RequestException e) {
GWT.log(e.getLocalizedMessage());
}
return false;
}
/code
I want the line
code
return true;
/code
to be executed only after the dialog is closed just like what would
happen if I used Window.confirm to achieve the modality as shown
below.
code
Window.confirm(yes or no);
return true;
/code
Any ideas on how I can achieve this.
Thanks,
Melody
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Re: Modal Dialog/Non-busy Wait
On Monday, September 5, 2011 1:01:29 PM UTC-4, melody wrote:
I wish to embed an asynchronous call to the server inside a method
that MUST NOT return until the server has responded. So I am looking
for a way to achieve a non-busy wait in GWT. I thought I could use a
modal popup dialog to stop the next line from being executed until the
dialog is closed and only after the response from server arrives.
Unfortunately the GWT modal dialog does not do what I thought it would
do -- which is block everything and wait at the line where the
PopupPanel.show() method is called. See method below
code
public boolean doPost(String url, String postData) {
RequestBuilder builder = new
RequestBuilder(RequestBuilder.POST, url);
final int STATUS_CODE_OK = 200;
final PopupPanel dlg = new PopupPanel();
dlg.setModal(true);
dlg.setGlassEnabled(true);
try {
builder.setHeader(Content-Type, application/x-www-form-
urlencoded);
builder.sendRequest(postData, new RequestCallback() {
public void onError(Request request, Throwable
exception) {
dlg.hide();
}
public void onResponseReceived(Request request,
Response response) {
int li_status = response.getStatusCode();
if (li_status == STATUS_CODE_OK) {
//bravo
}
dlg.hide();
}
});
builder.setTimeoutMillis(3000);
dlg.show();
return true;
} catch (RequestException e) {
GWT.log(e.getLocalizedMessage());
}
return false;
}
/code
I want the line
code
return true;
/code
to be executed only after the dialog is closed just like what would
happen if I used Window.confirm to achieve the modality as shown
below.
code
Window.confirm(yes or no);
return true;
/code
Any ideas on how I can achieve this.
Thanks,
Melody
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Modal Dialog/Non-busy Wait
I wish to embed an asynchronous call to the server inside a method
that MUST NOT return until the server has responded. So I am looking
for a way to achieve a non-busy wait in GWT. I thought I could use a
modal popup dialog to stop the next line from being executed until the
dialog is closed and only after the response from server arrives.
Unfortunately the GWT modal dialog does not do what I thought it would
do -- which is block everything and wait at the line where the
PopupPanel.show() method is called. See method below
code
public boolean doPost(String url, String postData) {
RequestBuilder builder = new
RequestBuilder(RequestBuilder.POST, url);
final int STATUS_CODE_OK = 200;
final PopupPanel dlg = new PopupPanel();
dlg.setModal(true);
dlg.setGlassEnabled(true);
try {
builder.setHeader(Content-Type, application/x-www-form-
urlencoded);
builder.sendRequest(postData, new RequestCallback() {
public void onError(Request request, Throwable
exception) {
dlg.hide();
}
public void onResponseReceived(Request request,
Response response) {
int li_status = response.getStatusCode();
if (li_status == STATUS_CODE_OK) {
//bravo
}
dlg.hide();
}
});
builder.setTimeoutMillis(3000);
dlg.show();
return true;
} catch (RequestException e) {
GWT.log(e.getLocalizedMessage());
}
return false;
}
/code
I want the line
code
return true;
/code
to be executed only after the dialog is closed just like what would
happen if I used Window.confirm to achieve the modality as shown
below.
code
Window.confirm(yes or no);
return true;
/code
Any ideas on how I can achieve this.
Thanks,
Melody
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Google Web Toolkit group.
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