Hi Suri,
Thanks for this tip !
But IMHO in your case I think that the problem is in the hosted page:
Try replacing:
var testVar = <%= request.getAttribute("someValue") %>
by:
var testVar = "<%= request.getAttribute("someValue") %>"
Notice the quote !
Then the generate js will be:
var testVar = "12345"; // a string
Instead of
var testVar = 12345; // an int
However your solution seems pretty to me and it's better check twice
those JS type.
Best regards
Olivier.
On Thu, Nov 20, 2008 at 10:19 PM, Suri <[EMAIL PROTECTED]> wrote:
>
> Hi Olivier,
> I just thought I'd let you know. The script you have works great
> however needs one additional modification.
>
> public static native String jnsiGetString(String jsVar, String
> defaultValue)/*-{
> var value = eval('$wnd.'+jsVar);
> if(value){
> return value.toString();
> }
> return defaultValue;
> }-*/;
>
> and
>
> public String getSomeValue(){
> return jnsiGetString("someValue", null);
>
> }
>
> Notice the .toString(). This is so that the value being returned is
> truly converted to a String datatype. As part of doing some work I had
> used the script but the variable that was being referenced, happened
> to have a numeric value. Thus, when trying to do an RPC, the system
> kept giving me a ClassCastException although I was sure I was passing
> a String (it also passed the instanceof test) but once I put
> the .toString() it worked correctly. I guess something funky happens
> there no idea what. e.g
> --- JSP-----------------
> <script language="javascript" type="text/javascript">
> // someValue happens to be an integer although its sent as a String
> in Java e.g "123456"
> var testVar = <%= request.getAttribute("someValue") %>
> </script>
> ---------------------------
>
> ----- Client Code ------------
>
> .......
> String testValue = getString("testVar", "0");
> // Although this executes correctly and works fine, it acts up later
> in the code unless the .toString() method is called in the javascript
> as shown before.
> ------------------------------------
>
> Thanks
>
> Suri
> On Nov 20, 11:34 am, Suri <[EMAIL PROTECTED]> wrote:
>> Thanks Olivier. That makes sense. I'll have to use the String and
>> validate it at the server side I guess.
>>
>> Suri
>>
>> On Nov 20, 10:08 am, "olivier nouguier" <[EMAIL PROTECTED]>
>> wrote:
>>
>> > There is no long datatype in javascript !
>>
>> >http://www.google.com/search?q=GWT+long+emulation&sourceid=navclient-...
>>
>> > On Thu, Nov 20, 2008 at 3:31 PM, Suri <[EMAIL PROTECTED]> wrote:
>>
>> > > Hi Olivier,
>> > > I actually saw your post later on another thread and used the default
>> > > solution. Thanks for that. Pretty neat.
>> > > A different question now, I observed that after obtaining the value I
>> > > wanted, I could not convert it to a Long type. i.e
>>
>> > > in my client java code after retrieving the value using the native
>> > > method above I try something like
>>
>> > > Long longVal = Long.parseLong("returnedValue");
>>
>> > > And that seems to throw an error in the browser. I do remember reading
>> > > about some issues with Long datatype and javascript, however any
>> > > explanation is welcome. I'd like to understand it better.
>> > > Thanks
>> > > Suri
>>
>> > > On Nov 20, 3:43 am, "olivier nouguier" <[EMAIL PROTECTED]>
>> > > wrote:
>> > >> public native String getSomeValue() /*- {
>> > >> return $wnd.someValue.}*-/;
>>
>> > >> But be aware of "undef" !!!
>> > >> should be:
>> > >> public native String getSomeValue() /*- {
>> > >> if($wnd.someValue){
>> > >> return $wnd.someValue.
>> > >> }
>> > >> return null;
>>
>> > >> }*-/;
>>
>> > >> More generic:
>>
>> > >> public static native String jnsiGetString(String jsVar, String
>> > >> defaultValue)/*-{
>> > >> var value = eval('$wnd.'+jsVar);
>> > >> if(value){
>> > >> return value;
>> > >> }
>> > >> return defaultValue;
>> > >> }-*/;
>>
>> > >> and
>>
>> > >> public String getSomeValue(){
>> > >> return jnsiGetString("someValue", null);
>>
>> > >> }
>>
>> > >> HIH
>>
>> > >> On Wed, Nov 19, 2008 at 8:46 PM, Suri <[EMAIL PROTECTED]> wrote:
>>
>> > >> > As an update question as well,
>>
>> > >> > Does anyone know if this is correct syntax and if not what would be
>> > >> > the correct way to go about this.
>> > >> > I'm trying to copy the value of my javascript variable set in theJSP
>> > >> > to the GWT client.
>>
>> > >> > --------JSPFILE --------------
>> > >> > <script language="javascript" type="text/javascript">
>>
>> > >> > var someValue = <%= (String) request.getAttribute("someValue")
>> > >> > %>
>>
>> > >> > </script>
>> > >> > ------------------------------------ GWT ENTRY POINT CLIENT CLASS
>> > >> > ---------------------
>>
>> > >> > public class SomeClass
>> > >> > {
>> > >> > private String someValue;
>>
>> > >> > public onModuleLoad()
>> > >> > {
>> > >> > this.someValue = getSomeValue;
>> > >> > }
>>
>> > >> > public native String getSomeValue() /*- {
>> > >> > return someValue;
>> > >> > } -*/
>>
>> > >> > }
>> > >> > ----------------------------------------------------------------------------------------------------------------
>>
>> > >> > Thanks.
>>
>> > >> > On Nov 19, 11:40 am, Suri <[EMAIL PROTECTED]> wrote:
>> > >> >> Hi,
>> > >> >> This must've been asked a million times and I tried looking but the
>> > >> >> only answer I got was JSNI in most cases. I just want to be sure its
>> > >> >> the only way. Assuming I was passing data to myJSPafter my action
>> > >> >> has completed. Lets say a value for a studentID.
>> > >> >> Now in my GWT module I'll need this studentID so that I can then load
>> > >> >> up information about that student using GWT code.
>> > >> >> In theJSPI have 2 options
>>
>> > >> >> 1.
>> > >> >> <script language=javscript>
>> > >> >> var studentID = <%=request.getAttribute("studentID")%>
>> > >> >> </script>
>>
>> > >> >> OR
>> > >> >> 2.
>> > >> >> <input type="hidden" value=<%=request.getAttribute("studentID")% />
>>
>> > >> >> In the case of (1) I see that we would basically HAVE to use JSNI to
>> > >> >> be able to retrieve the value to GWT and then store it and use it.
>> > >> >> My question is how if possible would the 2nd option implementable. Do
>> > >> >> I access the DOM in some form from the GWT client code to be able to
>> > >> >> access the value of the studentID (I assume before doing this I would
>> > >> >> have had to have given the <input..> field an id attribute?)
>>
>> > >> >> Thanks for any input
>> > >> >> Suri
>>
>> > >> --
>> > >> Si l'ignorance peut servir de consolation, elle n'en est pas moins
>> > >> illusoire.
>>
>> > --
>> > Si l'ignorance peut servir de consolation, elle n'en est pas moins
>> > illusoire.
> >
>
--
Si l'ignorance peut servir de consolation, elle n'en est pas moins illusoire.
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