get scroll event from iframe

[bhomass]

there seems to be no way in GWT to get the iframe scrollEvent.

I tried

(com.google.gwt.dom.client.IFrameElement)frame.addDomHandler(newScrollHandler() 
{

   @Override

 public void onScroll(ScrollEvent event) {

  // do something

 }

 }, ScrollEvent.getType());

but the event does not fire when scrolling

inside the iframe, you can get

 Document document = iframe.getContentDocument(); 

but it does not have methods for adding listeners. there is no method for 
returning the contentWindow like in javascript.

any one knows any way to get the iframe scroll event?



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Re: drag and drop group

[bhomass]

based on html5 spec, the way to disallow a drop is to return true inside 
dragover

function dragOver(ev) {
return true;
}

but in GWT, the dragover hander has a void return type. there is no way to 
return anything.

panel1.addBitlessDomHandler(new DragOverHandler() {
@Override
public void onDragOver(DragOverEvent event) {
   // can not return anything.
}
}, DragOverEvent.getType());

It is quite possible, GWT implementation simply messed this one up.

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Re: drag and drop group

[bhomass]

conceptually, of course that is what you want to do. I tried disallow the 
drop from inside the onDragEnter and onDragOver events, but don't see any 
api to set the drag icon to disabled mode. I played 
with event.getDataTransfer().setDragImage(...), but it has no effect.


On Wednesday, May 22, 2013 3:45:39 AM UTC-7, Jens wrote:

 Haven't used GWT Drag and Drop yet but can't you just skip the code in 
 your drag or drop handler if your group condition isn't true?

 -- J.


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Re: drag and drop group

[bhomass]

you mean no body has done this before? 

On Thursday, May 16, 2013 11:23:02 AM UTC-7, bhomass wrote:

 I have been using GWT native Dnd successfully.

 Now I have a need to create Dnd group. This means if Widget A and panel B 
 are in the same group, I want to allow user to drag A into B. C and D forms 
 another group. So, A can not be dropped onto D, only C can. and likewise, C 
 can not be dropped into B.

 Anyone knows how to implement this?


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drag and drop group

[bhomass]

I have been using GWT native Dnd successfully.

Now I have a need to create Dnd group. This means if Widget A and panel B 
are in the same group, I want to allow user to drag A into B. C and D forms 
another group. So, A can not be dropped onto D, only C can. and likewise, C 
can not be dropped into B.

Anyone knows how to implement this?

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any one tried GWT with SPDY?

[bhomass]

do you still leave the RPC mechanism exception implement SPDY somehow?

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datePicker show current date after setValue

[bhomass]

I called setValue(dueDate) on the datePicker. it apparently sets the new 
date value ok, but does not reload the calendar page of the new date. It 
stays on the page with today's date. which method do I use to get it to 
update its page to show the current date?

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Re: datePicker show current date after setValue

[bhomass]

ha, that's an easy one. maybe that's why gwt team never bothered with a 
method to do it. I still think a parameter setting is a better idea. thanks!

On Friday, January 4, 2013 6:38:05 AM UTC-8, Thomas Broyer wrote:

 setCurrentMonthhttp://google-web-toolkit.googlecode.com/svn/javadoc/latest/com/google/gwt/user/datepicker/client/DatePicker.html#setCurrentMonth(java.util.Date)
 ?

 On Friday, January 4, 2013 9:01:12 AM UTC+1, bhomass wrote:

 I called setValue(dueDate) on the datePicker. it apparently sets the new 
 date value ok, but does not reload the calendar page of the new date. It 
 stays on the page with today's date. which method do I use to get it to 
 update its page to show the current date?



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LI element with a clickhandler

[bhomass]

I read up on this post
https://groups.google.com/forum/?fromgroups=#!topic/Google-Web-Toolkit/Zg5XQc9aCaI

for the whole day I am stuck on this issue, this article seems right on the 
topic, but the code was abbreviated to the point I can not get it working.

class MyList extends Widget implements HasClickHandlers { 
   public MyList() { 
  // TODO: build your DOM tree here 
  setElement(ulElement); 
   } 

   public HandlerRegistration addClickHandler(ClickHandler handler) { 
  addDomHandler(handler, ClickEvent.getType()); 
   } 

   // Helper method, not strictly necessary but very helpful 
   // You could either return a LIElement or the index of the item in 
the list as an int 
   public int getItemFromEvent(DomEvent? event) { 
  // TODO: see my previous message about how to implement it 
  // see also the code for HTMLTable.getCellForEvent 
   } 
} 

so where do I actually add the clickhandler?

I tried  
this.addClickHandler(new ClickHandler() {
 @Override
public void onClick(ClickEvent event) {
int a = 0;
}
});


the compiler does not complain but this handler does not respond to mouse 
clicks.

I tried

anchorLink.addClickHandler(new ClickHandler() {
 @Override
public void onClick(ClickEvent event) {
int a = 0;
}
});

where anchorLink is an anchorElement, the compiler complains 
addClickHandler is not a method of anchorLink.

Can someone help me complete the posted sample code.



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Re: can not get multiple matches using regex

[bhomass]

 in that case, what is the point of matchResult.getGroupCount()? it is 
 always 1.

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tie css to a global class

[bhomass]

I know how to declare .css and .html for a local template. but sometimes, 
you need to cascade a css statement to from one higher up. For example, if 
you have a class .small-widget in one template, which must behave a certain 
way if you declare .scroll-mode in the body element. 

.scroll-mode .small-widget {
  font: .;
}

You wouldn't want to declare .scroll-mode in your local template style 
interface, because the class name would no longer match that declared in 
the body element. How to accomplish this?

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can not get multiple matches using regex

[bhomass]

I am using GWT Regex

RegExp regExp = RegExp.compile(\\b + searchWord + \\b, gi);
MatchResult matcher = regExp.exec(input);

this only returns the first match. why is that? I already set the global 
option. any one knows how to get multiple match return?

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Re: preview in case of iframe

[bhomass]

thanks, I figured as much. The two documents are independent DOM structures 
and while the preview is global, it is only global within one DOM 
structure.

I got what I want w/o preview, using *addDomHandler. 

**as long as you have the handle to components in both frames, this works 
quite fine.*
*
*

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preview in case of iframe

[bhomass]

I have been struggling with this for the whole day and can't crack the
nut.

I know how things work when you call
Event.addNativePreviewHandler(handler) to trigger event preview. The
preview is meant to be a global concept so that anything events
happening else where would get previewed. However, if an iframe is
added into the picture, the previewer is apparently not so global.
things happening inside the iframe does not trigger DOM.preview(evt),
and therefore does not get previewed.

I suppose this makes sense, that the iframe has an independent DOM
structure from the parent. Does any one know of a way to bridge the
two so that the two parts together still behaves truly in a GLOBAL
way?

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slow passing json back

[bhomass]

I have been carefully studying my code to see what is taking so long
to load a page. It turns out it took 4.5 secs to pass back 19k
characters (in javascript) using the gwt rpc.

Is this considered an enormous amount of javascript code? anything I
can do to speed up the transmission?

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classloader can not load class from annotation

[bhomass]

I am integrating a mvp4g into java Play. I am running into an
unexpected error, related to Thread based context classloader. When
the code gets to TypeOracleMediator, line 750 in the
resolveAnnotationValue method,

try {
  return Class.forName(valueType.getClassName(), false,
  Thread.currentThread().getContextClassLoader());
} catch (ClassNotFoundException e) {
  logger.log(TreeLogger.ERROR, Annotation error: cannot
resolve 
  + valueType.getClassName(), e);
  return null;
}
  }

I get a ClassNotFoundException. I double checked the returned
classloader and verified that the classpath does not include the
project classes directory.

How can I fix this problem? I don't see a way to add a classpath into
the classloader (it is a subclass or URLClassLoader). Should I simply
create a new URLClassLoader with the classes dir added as an url path?

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TypeOracleMediator help

[bhomass]

I am using java Play with mvp4g and found out they don't work
together. neither group is able to provide help, because each one is
unfamiliar with the other.

I think the GWT group is best equipped to provide some insight into
this, because it has to do with TypeOracleMediator's use of Thread
based ContextClassLoader.

Let's try this wo getting into Play too much. Play has the ability to
incorporate different modules. One of these modules contributed by an
author is the gwt module. I tested out two projects, with and wo the
use of Play.

case 1, wo Play, the code processes right thru and found presenter and
views represented using mvp4g annotation. the relevant code in gwt2.4
is TypeOracleMediator line 750, inside resolveAnnotationValue() method

  try {
  return Class.forName(valueType.getClassName(), false,
  Thread.currentThread().getContextClassLoader());
} catch (ClassNotFoundException e) {
  logger.log(TreeLogger.ERROR, Annotation error: cannot
resolve 
  + valueType.getClassName(), e);
  return null;
}

so, wo Play framework, this call resolves a presenter or view class
and returns a good value.

case 2. same code with Play framework, the call ends with
ClassNotFoundException and returns null.

I checked in both cases, the thread is a daemon thread tie to the
browser request. Why should there be such a difference? anyone has an
idea how to proceed?


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play fails to compile after injecting mvp4g

[bhomass]

I have used mvp4g successfully before. Now I am trying to get it to
work inside Play. There is no compilation error inside eclipse, but
fails either when I run it or compiling it. the error dump is long,
here is a partial listing

java.lang.ClassNotFoundException: client.presenter.UserCreatePresenter
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Unknown Source)
at
com.google.gwt.dev.javac.TypeOracleMediator.resolveAnnotationValue(Ty
peOracleMediator.java:727)
at
com.google.gwt.dev.javac.TypeOracleMediator.resolveAnnotationValue(Ty
peOracleMediator.java:666)
at
com.google.gwt.dev.javac.TypeOracleMediator.createAnnotation(TypeOrac
leMediator.java:469)
at
com.google.gwt.dev.javac.TypeOracleMediator.resolveAnnotation(TypeOra
cleMediator.java:625)
at
com.google.gwt.dev.javac.TypeOracleMediator.resolveAnnotations(TypeOr
acleMediator.java:640)
at
com.google.gwt.dev.javac.TypeOracleMediator.resolveMethod(TypeOracleM
ediator.java:980)
at
com.google.gwt.dev.javac.TypeOracleMediator.resolveClass(TypeOracleMe
diator.java:839)
at
com.google.gwt.dev.javac.TypeOracleMediator.addNewTypes(TypeOracleMed
iator.java:411)
at
com.google.gwt.dev.javac.TypeOracleMediatorFromSource.addNewUnits(Typ
eOracleMediatorFromSource.java:54)
at
com.google.gwt.dev.javac.CompilationState.assimilateUnits(Compilation
State.java:165)
at
com.google.gwt.dev.javac.CompilationState.init(CompilationState.jav
a:82)
at
com.google.gwt.dev.javac.CompilationStateBuilder.doBuildFrom(Compilat
ionStateBuilder.java:392)
at
com.google.gwt.dev.javac.CompilationStateBuilder.buildFrom(Compilatio
nStateBuilder.java:275)
at
com.google.gwt.dev.cfg.ModuleDef.getCompilationState(ModuleDef.java:3
25)
at com.google.gwt.dev.Precompile.precompile(Precompile.java:
512)
at com.google.gwt.dev.Precompile.precompile(Precompile.java:
495)
at com.google.gwt.dev.Precompile.precompile(Precompile.java:
407)
at com.google.gwt.dev.Compiler.run(Compiler.java:215)
at com.google.gwt.dev.Compiler.run(Compiler.java:187)
at com.google.gwt.dev.Compiler$1.run(Compiler.java:159)
at
com.google.gwt.dev.CompileTaskRunner.doRun(CompileTaskRunner.java:87)

at
com.google.gwt.dev.CompileTaskRunner.runWithAppropriateLogger(Compile
TaskRunner.java:81)
at com.google.gwt.dev.Compiler.main(Compiler.java:166)
 [ERROR] Annotation error: expected class java.lang.Class, got
null
   Resolving client.presenter.RootPresenter
  Found type 'client.presenter.RootPresenter'
 [ERROR] Annotation error: cannot resolve client.view.RootView
java.lang.ClassNotFoundException: client.view.RootView
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Unknown Source)
at
com.google.gwt.dev.javac.TypeOracleMediator.resolveAnnotationValue(Ty
peOracleMediator.java:727)
at
com.google.gwt.dev.javac.TypeOracleMediator.createAnnotation(TypeOrac
leMediator.java:469)
at
com.google.gwt.dev.javac.TypeOracleMediator.resolveAnnotation(TypeOra
cleMediator.java:625)
at
com.google.gwt.dev.javac.TypeOracleMediator.resolveAnnotations(TypeOr
acleMediator.java:640)
at
com.google.gwt.dev.javac.TypeOracleMediator.resolveClass(TypeOracleMe
diator.java:786)
at
com.google.gwt.dev.javac.TypeOracleMediator.addNewTypes(TypeOracleMed
iator.java:411)
at
com.google.gwt.dev.javac.TypeOracleMediatorFromSource.addNewUnits(Typ
eOracleMediatorFromSource.java:54)
at
com.google.gwt.dev.javac.CompilationState.assimilateUnits(Compilation
State.java:165)
at
com.google.gwt.dev.javac.CompilationState.init(CompilationState.jav
a:82)
at
com.google.gwt.dev.javac.CompilationStateBuilder.doBuildFrom(Compilat
ionStateBuilder.java:392)
at
com.google.gwt.dev.javac.CompilationStateBuilder.buildFrom(Compilatio
nStateBuilder.java:275)
at
com.google.gwt.dev.cfg.ModuleDef.getCompilationState(ModuleDef.java:3
25)
at com.google.gwt.dev.Precompile.precompile(Precompile.java:
512)
at com.google.gwt.dev.Precompile.precompile(Precompile.java:
495)
at 

spurious blur event after update to 2.3

[bhomass]

I used the CellEditor.startEdit() feature on a tab header. after
upgrade to GWT 2.3, I am getting unexplained blur events which
continuous stops editing. for example, right after I start edit mode
(by double clicking the header), there is a blur event. I used the
code to ignore that. then after every key stroke, another blur event,
there are others whose origin is not at all clear.

Any one knows what could be causing this and how to prevent it?

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mvp complex model

[bhomass]

usually, the model in mvp is the DTO, in case the model is complex,
for example, when the validation of user input is elaborate, do you
put the validation methods in the DTO, or the presenter, or another
group of dedicated model behavior classes?

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gwt compilation to javascript

[bhomass]

In pure javascript, an instance of a object does not repeat the
function code, in the same way java is. when gwt compiles java into
javascript, is the same efficiency built into the javascript?

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$doc.body.createTextRange

[bhomass]

I know there is a javascript function for
document.body.createTextRange( )

when I try
$doc.body.createTextRange()

in a native method in GWT, it says

body.createTextRange is not a function

why is that?

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deserialization error when DTO is nested

[bhomass]

I have a composite pattern DTO, where an DTO instance may contain a
child list of the same type.

first this app runs fine when in hosted mode, but get deserialization
error when in deployed mode using tomcat.

I can leave the nested structure in the DTO class as long as I don't
actually populate the child list. but as soon as I populate the child
list the deserialization error shows up.

again, works find in hosted mode, fails in deployed mode if child list
is populated. I did a thorough search on the web, no one reported a
similar problem. and I made absolutely sure I have a zero argument
constructor.

any ideas from any one?

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Re: remove old javascript file

[bhomass]

I understand that. assuming you are calling the module.nocache.js the
bootstrap code.

my last question is HOW to make it not cacheable. I know about using
meta tag to mark a page uncacheable, but how do you make one .js
uncacheable?



On Jul 21, 6:48 am, Stefan Bachert stefanbach...@yahoo.de wrote:
 Hi,

 the bootstrap code should never be cached.

 Assume you are deploying a new version.
 The bootstrap code refers the browser/locale specific JS using an own
 strong name.
 If you cache the bootstrap file, it may happen that old bootstrap code
 refers to old strong named file
 which are no more existing.

 Stefan Bachert
 http::/gwtworld.de

 due to recent cases, I am sorry, I won't do free personal support.
 inquiries for professional GWT support are welcome.

 On 20 Jul., 23:13, bhomass bhom...@gmail.com wrote:

  I found a number of conflicting comments concerning this. And, even if
  they are in sync, I have questions on how to set cache control.

  1. you stated - *Never Cache* - The bootstrap module-
  name.nocache.js, and your host html/jsp page falls under this
  category. The browser should never cache.  but the first reference
  above says
  (2) Changing occasionally (public / equal for all users)
  Examples: index.html, mymodule.nocache.js

  which sounds like you should cache for short time.

  I am unsure how I would set the cache control for the
  module.nocache.js. The js file is cotained in the app.hmtl. do I set
  meta http-equiv=Cache-Control content=no-store in the header of
  that page?

  should I use no-store or no-cache?

  2. you stated - *Cache for sometime* - Every other file falls under
  this category. In
     general, you should use ClientBundle so that files don't end in
  this
     category. GWT generated js/html files will never come under this
  category.
     You can choose to set an expires header ranging from a few hours to
  a few
     days, depending on how frequently you change your code.

  I can be sure whether you are saying to use client bundle so that
  nothing ever get cached for sometime. if so, why do you also specify
  set an expires header ranging from a few hours to a few  days?

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Re: remove old javascript file

[bhomass]

I found a number of conflicting comments concerning this. And, even if
they are in sync, I have questions on how to set cache control.

1. you stated - *Never Cache* - The bootstrap module-
name.nocache.js, and your host html/jsp page falls under this
category. The browser should never cache.  but the first reference
above says
(2) Changing occasionally (public / equal for all users)
Examples: index.html, mymodule.nocache.js

which sounds like you should cache for short time.

I am unsure how I would set the cache control for the
module.nocache.js. The js file is cotained in the app.hmtl. do I set
meta http-equiv=Cache-Control content=no-store in the header of
that page?

should I use no-store or no-cache?

2. you stated - *Cache for sometime* - Every other file falls under
this category. In
   general, you should use ClientBundle so that files don't end in
this
   category. GWT generated js/html files will never come under this
category.
   You can choose to set an expires header ranging from a few hours to
a few
   days, depending on how frequently you change your code.

I can be sure whether you are saying to use client bundle so that
nothing ever get cached for sometime. if so, why do you also specify
set an expires header ranging from a few hours to a few  days?





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Re: remove old javascript file

[bhomass]

I don't understand something. according to you, none of the generated
js would fall under cache for sometimes. That means all the js files
except nocache.js would be cached forever. and GWT takes care that new
file names will be generated when this type filed change. By this
logic, there could never be any stale js problem. yet, I see in
repeated cases, where someone's browser displays old app design, and
clearing browser cache brings up the latest. How can that be?

On Jun 26, 6:44 pm, André Severo Meira andrex1...@gmail.com wrote:
 Nice!

 2010/6/26 bhomass bhom...@gmail.com

  do you mean to set a limited cache lifetime or to not cache at all?

  I do normally want the javascript files to be cached for performance
  purposes.

  On Jun 17, 10:02 pm, Sripathi Krishnan sripathi.krish...@gmail.com
  wrote:
   No, you can't do that. But if you set appropriate cache headers, there is
   never a need to delete old files.

   --Sri

   On 18 June 2010 06:10, bhomass bhom...@gmail.com wrote:

is there any way to programmatically get user browser to delete all
its cached javascript files in order to push down new ones?

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call average inside eval()

[bhomass]

I am using a native method to call eval() on a valid javascript
statement.

private String[] evalscript(String javascript, String format){
return evalJavascript(javascript, format).toString().split(,);
}


private native Object evalJavascript(String javascript, String
format)/*-{

result = eval(javascript);

return result;

  }

This works generally. But I also need to use custom javascript
functions like average()l

function average()
{
   var items = average.arguments.length
   var sum = 0
   for (i = 0; i  items;i++)
   {
  sum += average.arguments[i]
   }
   return (sum/items)
}

I can put this average() as another native method inside the same
class. but I can't figure out how to get eval to look it up.

do I have to spell out the whole gwt naming convention
th...@myclass::average()(); ?

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Re: remove old javascript file

[bhomass]

do you mean to set a limited cache lifetime or to not cache at all?

I do normally want the javascript files to be cached for performance
purposes.

On Jun 17, 10:02 pm, Sripathi Krishnan sripathi.krish...@gmail.com
wrote:
 No, you can't do that. But if you set appropriate cache headers, there is
 never a need to delete old files.

 --Sri

 On 18 June 2010 06:10, bhomass bhom...@gmail.com wrote:

  is there any way to programmatically get user browser to delete all
  its cached javascript files in order to push down new ones?

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remove old javascript file

[bhomass]

is there any way to programmatically get user browser to delete all
its cached javascript files in order to push down new ones?

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Re: invalid httpsession from getThreadLocalRequest

[bhomass]

from a browser.

it worked for me all along too. but all of a sudden this problems
started. and when I resubmit by pressing the bottom again, the same
program works.

I am wondering if there is some tricky timing problem that someone has
seen before.

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invalid httpsession from getThreadLocalRequest

[bhomass]

when I use getThreadLocalRequest().getSession() in a servlet
implementation to handle rpc, I get a IllegalStateException when I
call

httpsession.setAttribute(...)

anyone knows why?

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Re: invalid httpsession from getThreadLocalRequest

[bhomass]

I am not running on the appengine, just my eclipse IDE. anything I
have to do for that?

On Feb 25, 8:15 pm, gao zhenyu program.c...@gmail.com wrote:
 you need add sessions-enabledtrue/sessions-enabled
 to yourappengine-web.xml file in WEB-INF directory.

 look 
 this:http://code.google.com/appengine/docs/java/config/appconfig.html#Enab...

 2010/2/26 bhomass bhom...@gmail.com

  when I use getThreadLocalRequest().getSession() in a servlet
  implementation to handle rpc, I get a IllegalStateException when I
  call

  httpsession.setAttribute(...)

  anyone knows why?

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custom runtime exception got translated to StatusCodeException

[bhomass]

I got my server side code to throw custom exceptions for a long time
and have a lot of working code to copy from.

this time, I throw a ExpiredSessionException, it got translated to
StatusCodeException. and on the client side, caught.getMessage() is
this huge html fragment, starting with Http Error: 500. the whole
message is too big to display in the error dialog and is unsuitable
for users.

the only difference I can detect is
1. the ExpiredSessionException is not a declared exception,
2. it is throw during the service() call, instead of in one the rpc
methods.

I am not sure what is the cause for loosing my original Exception.

how can I get gwt to throw my own exception and not the
StatusCodeException?

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service implementation for GWT best practice

[bhomass]

On Ray Ryan's presentation, there is no sample code for implementation
of the ContactsService.

The code structure would look something like

public class ContactsServiceImpl implements RTSService {

@Override
public T extends Response T execute(ActionT action) {
// TODO Auto-generated method stub
return null;
}

}

I am wondering how do you use one execute to implement server side
functions for all the possible actions? do you use a factory method to
identify the action class and send the request off to different
utility classes to process?

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Re: Convenience callback method

[bhomass]

I am trying out the rpc structure given in the seminar. I get an error

20:42:08.171 [ERROR] [rts]
com.jcalc.webclient.client.spreadsheet.rpc.action.GetRecords is not
assignable to 'com.google.gwt.user.client.rpc.IsSerializable' or
'java.io.Serializable' nor does it have a custom field serializer
(reached via com.jcalc.webclient.client.rpc.ActionT)

20:42:08.187 [ERROR] [rts] Deferred binding failed for
'com.jcalc.webclient.client.spreadsheet.rpc.RecordService'; expect
subsequent failures

any one else seen this type of error?

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Re: Convenience callback method

[bhomass]

I think I found what I was looking for

abstract class GotDetails implements
AsyncCallbackGetDetailsResponse {
public void onFailure(Throwable oops) {
/* default appwide failure handling */
}
public void onSuccess(GetDetailsResponse result) {
got(result.getDetails());
}
public abstract void got(ArrayListContactDetail details);
}

got() was called inside onSuccess()


Thanks

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Re: Convenience callback method

[bhomass]

Sri

thanks for the pointer. the article lays out the project structure
with all the classes, but I don't see where you can download the code.
Is that intended? or do we only have the fragments on the page? in
which case, why the project structure?

Bruce

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Re: Convenience callback method

[bhomass]

could some one point out an avenue for finding answers to this
question. I am sure if google is provide these design guides, they
should have communication channels for Q/A.

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Convenience callback method

[bhomass]

I went thru Ray Ryan's talk on Best Practice for Arch. GWT App.

I am not able to figure how and who eventually called the
convenience method

new GotDetails(){
  public void got(ArrayListConteactDetails details){
 render...
  }
}

can someone who followed the talk shed some lights?

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overcome native browser behavior to ensure visible when focused

[bhomass]

I have a conflicting behavior in an editable grid.

when I have focus on a editable cell, I may need to scroll away to
another cell and come back, but I don't want the editing cell to loose
focus. So I captured the onBlur event and force the cell to remain in
focus. But when I call the focus() method on the cell's text field,
the browser forces the grid view to scroll back and display that
editing cell.

is there any way to defeat this browser behavior?


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Re: event for detecting DOM.createElement() is completed

[bhomass]

 createElement is synchronous/blocking; it doesn't return before
 completion, so there's no need for an event.
 You might need to attach the widget (or at least its element) to the
 document though to have its size computed so you can later adjust it.

I attached the new Element to its container using appendChild
(newElement) and checked for its height right afterwards, but the
height is always 0. I used
newElement.getClientHeight(), is that correct?

does the layout happen right after the appendChild()? or is there a
way to detect when the layout is completed?

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multiple criteria for selector

[bhomass]

I am using the gwt css selector

fly((com.google.gwt.user.client.Element) parentElement).select
(attachedSelector);

where attachedSelector right now is
attached, attachedMaster, attachedTemplate

what I want to get is the elements with any of the above classnames.
But none was returned.

I also tried with the comma in between, same null result.

what is the right way to select among multiple css class names?

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event for detecting DOM.createElement() is completed

[bhomass]

I need to know when a widget is finished rendering in order to adjust
its size. I see a javascript method
element.addEventListener(eventType, handler, capture);

can someone tell me what eventType I can use to detect the completion
of DOM.createElement()?

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instanceof Element check fails in FF

[bhomass]

I have this statement
NodeListNode childNodes = tdElement.getChildNodes();
for (int i=0; ichildNodes.getLength(); i++){
Node childNode = childNodes.getItem(i);
if (childNode instanceof Element !#text.equals
(childNode.getNodeName())){
dosomething();
}
 }

but the #text nodes get thru the if (childNode instanceof Element)
check. I have to add

if (childNode instanceof Element !#text.equals
(childNode.getNodeName())

to fix it. I am sure #text is not an element, and this problem does
not occur in IE, only in FF.

anyone else knows about this anomaly?

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Re: float exception message to client fix does not work

[bhomass]

I apologize. It works. the mistake was else where.
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float exception message to client fix does not work

[bhomass]

I tried technique stated in
http://astithas.blogspot.com/2007/08/case-of-disappeared-exception-message.html

but it does not work. I still get the same old
see server log for details.

any one with experience on this?
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change css rules dynamically

[bhomass]

I found there is a way to change css rules using javascript.

http://twelvestone.com/forum_thread/view/31411.

is there a way to do this using gwt?
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TextBoxImpl, find cursor position when clicking inside a selection range

[bhomass]

when using a TextBoxImpl, you can get the cursor position and
selection length correctly, except when you highlight some text, then
click inside the highlighted area. In which case you consistently get
cursor position of 0.

this means, there is no way to programmatically determine where the
cursor is any more, even though visually the cursor lands right where
you last clicked (in the middle of the previously selected text
range).

any one have any solutions to this problem?
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Re: float error message to client via InvocationException

[bhomass]

I am really surprised there is no taker for this posting. I thought
this would be a real common issue.
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float error message to client via InvocationException

[bhomass]

I tried to display the server exception message on the client using

throw new InvocationException(ex.getMessage());

but, on the client, it always come out as

check the server log!

How do I get the client side to display the real server exception
message?
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Something other than a Java object was returned from JSNI method when getting colspan

[bhomass]

I have some very simple code

String colspan = tdElement.getAttribute(colspan);

it continually crash with
Something other than a Java object was returned from JSNI method.
also crashes with rowspan, but ok with some other attribute like
id

when I get its parent tr, then getting colspan and rowspan is no
problem. this is on IE6.

is this a known bug?
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Re: Something other than a Java object was returned from JSNI method when getting colspan

[bhomass]

I already try the fix
public final native String getAttribute(Element element, String
name) /*-{
return element.getAttribute(name, 2)|| ;
}-*/;

but the same exception. did I do something wrong in doing the fix?
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write html into a text field

[bhomass]

I have the need to store content which is actual valid html text. and
I am inputting such text using text fields written in GWT.

It seems GWT is not able to distinguish what is literal text and what
is in the original page content. after I enter a html fragment like
table into the text field, the page layout becomes distorted. the
browser started to interpret my content as though it is part of the
html page.

how are you suppose to capture valid html text into a form field?
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can sink key events on canvas

[bhomass]

I am able to get context menu and mouse events but not key events from
gwt canvas. anyone know why?

sinkEvents(Event.ONCONTEXTMENU | Event.MOUSEEVENTS | Event.KEYEVENTS);

public void onBrowserEvent(Event event) {
System.out.println(event +event.getType());
if (DOM.eventGetType(event) == Event.ONCONTEXTMENU) {
// this works
} else if (DOM.eventGetType(event) == Event.ONKEYPRESS) {
// never get anything
} else {
super.onBrowserEvent(event);   // get all the mouse events
}
}


I also tried sinking Event.ONKEYPRESS. same result.
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Re: dom manipulation works in IE but not in FF

[bhomass]

having some text nodes aren't so bad. the thing is after reading two
text nodes, it does not see the table node at all. why should that be?

for supplementary information, this is GWT 1.5.3 and I am talking
about deployed mode.
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om.google.gwt.user.client.rpc.IncompatibleRemoteServiceException: This application is out of date, please click the refresh button on your browser.

[bhomass]

suddenly I get this error on deployment. everything works fine running
out of eclipse.

it also says
(Could not locate requested method 'registerProject(java.lang.String,
java.lang.String)' in interface
'com.jcalc.webclient.client.RegisterProjectService' ).

I checked out that interface, there is nothing wrong.

how do you go about debugging this error? I did add gwt-log since last
deployment. can that cause this error?
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Re: dom manipulation works in IE but not in FF

[bhomass]

it fails for both of the form nodes in this doc. will you mind try it
out in FF like you did before? you get two #text nodes when you do
formelement.getChildNodes(), where the right answer is one table
element.

TABLE border=0 cellpadding=0 cellspacing=0 height=100%
width=100%
TBODY
TR
TD
align=left cellpadding=0 cellspacing=0 valign=top width=600
LINK
href=stylesheet.css rel=stylesheet /
!--
SCRIPT language=javascript src=checkjs.js/--
BR/
table
tr
 
td
 
FORM id=TopSalesSearchForm
 
TABLE align=center border=0 cellpadding=0 cellspacing=0
width=98%
 
TBODY
 
TR
 
TD width=40
 
IMG height=35 src=images/searchprefix.gif width=36 /
 
/TD
 
TD background=images/searchbg.gif class=font3 width=100%
 
sales
 
number:INPUT class=unnamed1 name=searchName /INPUT
class=button name=search onclick=submitMe('search');return
false; type=submit value=Submit Query /
 
/TD
 
/TR
 
/TBODY
 
/TABLE
 
/FORM
/
td
/tr
tr
 
td
 
FORM id=EditSalesForm
 
TABLE align=center border=0 cellpadding=4 cellspacing=1
class=t2 width=98%
 
TBODY
 
TR class=t3 height=27
 
TD width=30
 
Seq Number 
 
/TD
 
TD align=middle width=40
 
Serial Number
 
/TD
 
TD align=middle width=130
 
Created On
 
/TD
 
TD align=middle width=130
 
Client
 
/TD
 
TD align=middle width=200
 
Created By
 
/TD
 
TD align=middle width=50
 
Spec
 
/TD
 
TD align=middle width=50
 
Total Units
 
/TD
 
TD align=middle width=100
 
Apparent Total
 
/TD
 
TD align=middle width=100
 
Grand Total
 
/TD
 
/TR
 
TR class=t4 height=27
 
TD align=middle width=30
 
1
 
/TD
 
TD align=middle width=40
 
A href=SaleItemView.doNP98787/A
 
/TD
 
TD align=middle width=130
 
Nicole Kidman
 
/TD
 
TD align=middle width=130
 
04-09-2008
 
/TD
 
TD width=200
 
Good
 
/TD
 
TD align=middle width=50
 
65
 
/TD
 
TD align=right width=50
 
$89.00
 
/TD
 
TD align=right width=100
 
$4,800.00
 
/TD
 
TD align=right width=100
 
$9,000.00
 
/TD
 
/TR
 
TR class=t1 height=27
 
TD align=middle width=30
 
2
 
/TD
 
TD align=middle width=40
 
A href=SaleItemView.doHY90s/A
 
/TD
 
TD align=middle width=130
 
Woody Allen
 
/TD
 
TD align=middle width=130
 
3-23-2009
 
/TD
 
TD width=200
 
Great
 
/TD
 
TD align=middle width=50
 
87
 
/TD
 
TD align=right width=50
 
$29.00
 
/TD
 
TD align=right width=100
 
$1,300.00
 
/TD
 
TD align=right width=100
 
$4,030.00
 
/TD
 
/TR
 
TR class=t4 height=27
 
TD align=middle width=30
 
3
 
/TD
 
TD align=middle width=40
 
A href=SaleItemView.doLO98d/A
 
/TD
 
TD align=middle width=130
 
Russell Crow
 
/TD
 
TD align=middle width=130
 
1-21-2004
 
/TD
 
TD width=200
 
Nice
 
/TD
 
TD align=middle width=50
 
76
 
/TD
 
TD align=right width=50
 
$32.00
 
/TD
 
TD align=right width=100
 
$3,100.00
 
/TD
 
TD align=right width=100
 
$6,120.00
 
/TD
 
/TR
 
/TBODY
 
/TABLE
 
/FORM
/
td
/tr
/table
/TD
/TR
/TBODY
/TABLE
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Re: dom manipulation works in IE but not in FF

[bhomass]

this is one serious bug. no one knows anything about it?

I checked it out using gwt-log. in FF, even though
currentForm.getInnerHTML() returns the right element,
currentForm.getChildNodes() returns two non-existent #text.

is this a known problem?
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use of this inside native event handler

[bhomass]

I know that when calling a java function inside a native function, you
should add this. in the front. but if this is inside event handler,
this. becomes the element who received the event, and there is this
ambiguity. e.g.
private native void addClickListener(Element imgElement)/*-{
imgElement.onclick = function() {
this.style.border = '1px solid blue';
 
th...@com.jcalc.webclient.client.webpage.canvaseditor::highlight(Lcom/
google/gwt/user/client/Element;)(this);
};
}-*/;


as you can see, the first this. in this.style.border = '1px solid
blue'; meant imgElement. but the next one in the line below is meant
to refer the this java class.

how would I refer to this class instance?
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dom manipulation works in IE but not in FF

[bhomass]

I am doing an operation in which I remove a form but keep all its
children.

Element parent = (Element) currentForm.getParentElement();

NodeListNode formChildren = currentForm.getChildNodes(); //
for (int i = 0; i  formChildren.getLength(); i++) {
parent.insertBefore(formChildren.getItem(i), 
currentForm);
}
parent.removeChild(currentForm);

this code works in hosted browser. it works after compilation in IE,
but failes in FF.
FF removes the whole thing. there is nothing left after removing the
form.

how would one go about debugging something like this?

is this a known cross browser problem?
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element.getStyle().setProperty(borderStyle, none); wipes out all style attributes

[bhomass]

In my app, I need to dynamically set borders to some elements then
remove them.

to clear the border, I tried
element.getStyle().setProperty(borderStyle, none);
element.getStyle().setProperty(borderWidth, 0px);
DOM.setStyleAttribute(element, borderWidth, 0px);

it does clear the border, but also wipes out all other style
attributes. for example, I have float:left inside some div's, and I
meant to keep them.

funny thing is when I add the border,
DOM.setStyleAttribute(element, borderStyle, solid);
DOM.setStyleAttribute(element, borderWidth, 1px);
DOM.setStyleAttribute(element, borderColor, blue);

it leaves the float setting alone, it is only when I remove the
border, the float gets taken out.

how can I do this right?
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Re: element.getStyle().setProperty(borderStyle, none); wipes out all style attributes

[bhomass]

not a problem. my dumb mistake!
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launch another browser instance

[bhomass]

is there a way to click a button and launch another browser instance?
I am not talking about the hosted mode browser. let's say the app is
done and compiled.

this can be done in native javascript. but is there a gwt api for this?
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Re: launch another browser instance

[bhomass]

I did window.open. it can load the url, but

1. carries over css from mother page
2. seems to be embedded inside the mother page,
3. not giving me the other browser features like menu, address box,
etc.

I want a real browser instance.

Burce

On Jun 22, 1:05 pm, gscholt gsch...@gmail.com wrote:
 On Jun 22, 8:29 pm, bhomass bhom...@gmail.com wrote:

  is there a way to click a button and launch another browser instance?
  I am not talking about the hosted mode browser. let's say the app is
  done and compiled.

  this can be done in native javascript. but is there a gwt api for this?

 Do you mean Window.open() ?

 Gert
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Re: launch another browser instance

[bhomass]

I did window.open. it can load the url, but

1. carries over css from mother page
2. seems to be embedded inside the mother page,
3. not giving me the other browser features like menu, address box,
etc.

I want a real browser instance.

Burce

On Jun 22, 1:05 pm, gscholt gsch...@gmail.com wrote:
 On Jun 22, 8:29 pm, bhomass bhom...@gmail.com wrote:

  is there a way to click a button and launch another browser instance?
  I am not talking about the hosted mode browser. let's say the app is
  done and compiled.

  this can be done in native javascript. but is there a gwt api for this?

 Do you mean Window.open() ?

 Gert
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Re: $doc.selection is undefined in GWT

[bhomass]

found the answer.

FF uses $wnd.getSelection().getRangeAt(0)

thanks for all the help.
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detect browser window closing

[bhomass]

which event should I capture to detect that the user is closing the
browser window? this is issue warning if there are any dirty documents
in one of the editors.
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Re: $doc.selection is undefined in GWT

[bhomass]

Thanks for the clarification. I am sure I am close now. but still get
an error. my code is
private native Element getSelectedTextParent() /*-{
var range = null;
  if($wnd.document.selection){
range = $wnd.document.selection.createRange();
  } else if ($wnd.getSelection) {
range = $wnd.getSelection().createRange();
  } else if ($wnd.document.getSelection) {
range = $wnd.document.getSelection().createRange();
  }
return range.parentElement();
//return $doc.selection.createRange().parentElement();
}-*/;

I am getting $wnd.getSelection().createRange is not a function in
FireFox. it seems $wnd.getSelection() is ok, but can not createRange()?
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Re: war file for GWT 1.5

[bhomass]

thanks. that clarifies quite a lot, but not everything.

first I assume it would be ok for me to add any servlet context to the
path and create the WEB-INF directory accordingly.

for the static files, in hosted mode the url is
http://localhost:/com.jcalc.webclient.Explorer/index.html

do I keep the com.jcalc.webclient.Explorer directory for deployment?

also, port 8080 is the default port in my development machine, I just
thought I keep it as is while I am testing out the deployment code. is
that ok?
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Re: war file for GWT 1.5

[bhomass]

thanks. that clarifies quite a lot, but not everything.

first I assume it would be ok for me to add any servlet context to the
path and create the WEB-INF directory accordingly.

for the static files, in hosted mode the url is
http://localhost:/com.jcalc.webclient.Explorer/index.html

do I keep the com.jcalc.webclient.Explorer directory for deployment?

also, port 8080 is the default port in my development machine, I just
thought I keep it as is while I am testing out the deployment code. is
that ok?
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war file for GWT 1.5

[bhomass]

I have worked with servlet apps on Tomcat for a long time, and I
thought I know all about war files.

But I am confused about how GWT 1.5 generates a www directory and a
tomcat directory. so if I zip up all my java classes and put them
under the WEB-INF/classes directory under tomcat's webapps/Root, where
do I put all the static files from the www directory? aren't they
suppose to go the webapps/Root also?

would it be ok if I put them under some other context different from
Root?
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Re: war file for GWT 1.5

[bhomass]

I am experimenting by copying all the files under Tomcat_home/
webapps/ROOT/.

the web.xml under ROOT/WEB-INF is
?xml version=1.0 encoding=UTF-8?
web-app

filter
filter-nameHibernateSessionRequestFilter/filter-name
filter-classcom.jcalc.webcore.HibernateSessionRequestFilter/
filter-class
/filter

servlet
servlet-nameshell/servlet-name

servlet-classcom.google.gwt.dev.shell.GWTShellServlet/servlet-
class
/servlet

filter-mapping
filter-nameHibernateSessionRequestFilter/filter-name
url-pattern/*/url-pattern
/filter-mapping

servlet-mapping
servlet-nameshell/servlet-name
url-pattern/*/url-pattern
/servlet-mapping

/web-app


I am getting

Jun 5, 2009 2:44:10 PM org.apache.catalina.core.ApplicationContext log
SEVERE: Error loading WebappClassLoader
  delegate: false
  repositories:
/WEB-INF/classes/
-- Parent Classloader:
org.apache.catalina.loader.standardclassloa...@54172f
 com.google.gwt.dev.shell.GWTShellServlet
java.lang.ClassNotFoundException:
com.google.gwt.dev.shell.GWTShellServlet

but the gwt-dev-windows.jar is right there under
/ROOT/WEB-INF/lib

why wouldn't tomcat find it?
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Re: war file for GWT 1.5

[bhomass]

I am experimenting by copying all the files under Tomcat_home/
webapps/ROOT/.

the web.xml under ROOT/WEB-INF is
?xml version=1.0 encoding=UTF-8?
web-app

filter
filter-nameHibernateSessionRequestFilter/filter-name
filter-classcom.jcalc.webcore.HibernateSessionRequestFilter/
filter-class
/filter

servlet
servlet-nameshell/servlet-name

servlet-classcom.google.gwt.dev.shell.GWTShellServlet/servlet-
class
/servlet

filter-mapping
filter-nameHibernateSessionRequestFilter/filter-name
url-pattern/*/url-pattern
/filter-mapping

servlet-mapping
servlet-nameshell/servlet-name
url-pattern/*/url-pattern
/servlet-mapping

/web-app


I am getting

Jun 5, 2009 2:44:10 PM org.apache.catalina.core.ApplicationContext log
SEVERE: Error loading WebappClassLoader
  delegate: false
  repositories:
/WEB-INF/classes/
-- Parent Classloader:
org.apache.catalina.loader.standardclassloa...@54172f
 com.google.gwt.dev.shell.GWTShellServlet
java.lang.ClassNotFoundException:
com.google.gwt.dev.shell.GWTShellServlet

but the gwt-dev-windows.jar is right there under
/ROOT/WEB-INF/lib

why wouldn't tomcat find it?
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Re: war file for GWT 1.5

[bhomass]

btw, is it ok to use the default port 8080?
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Re: $doc.selection is undefined in GWT

[bhomass]

I looked up some cross browser code. but I am getting different
results

  if (document.getSelection) {
var range = document.getSelection().createRange();;
  } else if (document.selection  document.selection.createRange) {
var range = document.selection.createRange();
  } else {
var str = Sorry, this is not possible with your browser.;
  }

I use the range to get the parent Element, range.parentElement();

originally (using $doc), I get back a div, now I am getting back the
BODY element.
document.selection does not seem to be equivalent to $doc.selection,
even though it removes the browser incompatibility.

any ideas?
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$doc.selection is undefined in GWT

[bhomass]

I have a native method which uses
$doc.selection.createRange()

I am not sure why the $ before doc. I simply copied it from some
sample code. this method works find when in hosted mode. but after
compile and called directly from a browser I get the $doc.selection is
undefined error.

any one knows what's wrong with this?

sorry if this is second posting. I posted this question a few days
ago, but it does not come up in search.
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$doc.selection is undefined

[bhomass]

I have a native method which uses
$doc.selection.createRange()

I am not sure why the $ before doc. I simply copied it from some
sample code. this method works find when in hosted mode. but after
compile and called directly from a browser I get the $doc.selection is
undefined error.

any ideas?

Thanks.
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