I am considering 2 usecases. The first being an integration with the
Liferay Java portal where we would essentially have many portlets all
with the same portlet wrapper all using different deferred binding.
For instance, I would write one module to wrap all of our portlets and
write an ant script to change the module.gwt.xml's replace-with line
and recompile to produce all of our components. We essentially have 2
possible ways of displaying our portlets. One is a custom portlet
with no user management completely written in GWT, and the other is
Liferay (JSR Portlet spec). I would like to have them all use the
same code with minimal wrapper work, which is why I decided on the
approach I just explained. Also, I have been contemplating a way to
write a pure GWT portal implementation that would be completely
plugable. From the (limited) research I have done, I cannot find an
easy way to make GWT pluggable without seperating it into several
modules, and I could see a case where someone would like to put the
same portlet on the page twice with different data/configuration. I
have been working on a way to make this work, and I believe I have. I
think this could also be modified for all the work to be done as a
Linker, but I am not familiar enough with them to do that yet,
private static native JavaScriptObject fixWnd()/*-{
orig_wnd = $wnd;
while($wnd.parent != $wnd)
$wnd = $wnd.parent;
if (orig_wnd == $wnd)
return null;
$doc = $wnd.document;
return orig_wnd;
}-*/;
private static final JavaScriptObject originalWindow = fixWnd();
public static native String getQueryParam(String queryParam)
/*-{
return @com.gwt.client.GWTClient::originalWindow.gup(queryParam);
}-*/;
public void onModuleLoad()
{
if (originalWindow == null)
throw new RuntimeException("not meant to be run as a
standalone");
Alerter alerter = ((Alerter) GWT.create(Alerter.class));
RootPanel.get("container_" + getQueryParam("uuid")).add
(alerter.getWidget());
}
/tester/GWTTester.html
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<meta http-equiv="content-type" content="text/html;
charset=UTF-8">
<title>index</title>
<script type="text/javascript">
function gup( name )
{
name = name.replace(/[\[]/,"\\\[").replace(/[\]]/,"\\\]");
var regexS = "[\\?&]"+name+"=([^&#]*)";
var regex = new RegExp( regexS );
var results = regex.exec( window.location.href );
if( results == null )
return "";
else
return results[1];
}
</script>
</head>
<body style="margin:0;">
<script type="text/javascript" language="javascript"
src="tester.nocache.js"></script>
</body>
</html>
/index.html
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<meta http-equiv="content-type" content="text/html;
charset=UTF-8">
<title>index</title>
</head>
<body style="margin:0;">
<iframe src="tester/GWTTester.html?alerter=hello&uuid=1"
style="display:none;"></iframe>
<iframe src="tester/GWTTester.html?alerter=goodbye&uuid=2"
style="display:none;"></iframe>
<iframe src="tester/GWTTester.html?uuid=3" style="display:none;"></
iframe>
<div id="container_3"></div>
<div id="container_2"></div>
<div id="container_1"></div>
</body>
</html>
On Dec 30, 9:39 am, Jason Essington <[email protected]>
wrote:
> I can't think of a single usecase where it would be appropriate to load a
> module twice ... It would be effectively the same as loading YUI, or Dojo, or
> jQuery twice, Once it is there the first time there's no need to load it
> again, the code is already there.
>
> If you are simply trying to place a panel in multiple places on the page,
> that can be done from the single invocation of your module, look for the
> container elements in the DOM and add your panel (widgets)
>
> RootPanel.get("contianer1").add(myStuff);
> RootPanel.get("container2").add(anotherInstanceOfMyStuff);
>
> -jason
>
> On Dec 29, 2009, at 6:39 PM, Ian Bambury wrote:
>
> > Why would you want to run it twice? What effect are you trying to produce?
>
> > Ian
>
> >http://examples.roughian.com
>
> > 2009/12/30 lineman78 <[email protected]>
> > Can someone please tell me if it is possible to load the same module
> > twice. If so, how? I have tried including the script tag twice,
> > which used to work in older versions of gwt, but no longer works. I
> > was thinking that once it is loaded you could call the onModuleLoad
> > function manually, but cannot find how that would work. Another thing
> > I noticed is that if you do include the script tag twice, it writes
> > the code to the dom twice, but it is only executed once. If it is by
> > design that you can only run a module once by including the script
> > tag, maybe this ought to be prevented. I also tried using the cross
> > site linker, which is what i believe i used before to get this to
> > work.
>
> > <module>
> > <define-linker name="xs" class="com.google.gwt.core.linker.XSLinker"/
>
> > <add-linker name="xs"/>
>
> > <inherits name="com.google.gwt.user.User" />
> > <source path="client" />
>
> > <define-property values="hello,goodbye,default" name="alerter" />
>
> > <property-provider name="alerter">
> > <![CDATA[
> > var alerter = $wnd.gwttester_alerter;
> > if (alerter == null){
> > alerter = "default";
> > }
> > return alerter;
> > ]]>
> > </property-provider>
>
> > <replace-with class="com.gwt.client.alert.impl.HelloAlerter">
> > <when-type-is class="com.gwt.client.alert.Alerter" />
> > <when-property-is name="alerter" value="hello" />
> > </replace-with>
>
> > <replace-with class="com.gwt.client.alert.impl.GoodbyeAlerter">
> > <when-type-is class="com.gwt.client.alert.Alerter" />
> > <when-property-is name="alerter" value="goodbye" />
> > </replace-with>
>
> > <replace-with class="com.gwt.client.alert.impl.DefaultAlerter">
> > <when-type-is class="com.gwt.client.alert.Alerter" />
> > <when-property-is name="alerter" value="default" />
> > </replace-with>
>
> > <entry-point class="com.gwt.client.GWTClient"></entry-point>
> > </module>
>
> > <html>
> > <head>
> > <meta http-equiv="content-type" content="text/html;
> > charset=UTF-8">
> > <title>index</title>
> > </head>
> > <body>
> > <div>
> > <script type="text/javascript">var gwttester_alerter =
> > 'hello';</
> > script>
> > <script type="text/javascript" language="javascript"
> > src="com.gwt.GWTTester.nocache.js"/>
> > </div>
> > <div>
> > <script type="text/javascript">var gwttester_alerter =
> > 'goodbye';</
> > script>
> > <script type="text/javascript" language="javascript"
> > src="com.gwt.GWTTester.nocache.js"/>
> > </div>
> > </body>
> > </html>
>
> > --
>
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