[johndow777]

Dude, there are plenty of examples in the forum and in the showcase. You may also read this thread and download the generic rpc template for smart gwt or look for smart gwt ee/pro.

hi all,
I'm newbie with smartgwt
can anybody post small code snippet how to add record to listgrid.

I have listgrid and bellow it is add record button
add record button opens new window for filling parameters for record.
how to add record now ?
is it correct if i create ListGridRecord class instance and fill its attributes and
call dataSource.addData(listGridRecord); ?
if yes it didn't not work i get javascript errors:
"(TypeError): null has no properties"

is it correct if new window call addNewMyObject(My obj ...) mehtod
and after success adding destroy window and fetch data again ?

what is correct design pattern ???

____________________
Rgards,
Paata Lominadze
Magticom LTD.

[johndow777]

Hi, all i think that if you use smart gwt + rpc you may want to use json-rpc or just pass json strings that are converted to java objects to the server. Here is what i mean:

String jsonStringCameFromServerRPC = "........";
final JSONObject obj = (JSONObject) JSONParser.parse(jsonStringCameFromServerRPC);
final ListGridRecord record = new ListGridRecord(obj.getJavaScriptObject());
ds.addData(record);

All you have to do is to declare DataSourceFields with names, the same as the names of your transfer objects.

And on the server:

final JSON json = new JSON();
DTO someDTO .....
json.addConvertor(DTO.class, new JSONPojoConvertor(DTO.class));
String jsondto = json.toJSON(someDTO));
//send jsondto string to the grid

You get automatic transformation without manual copy for every dto.
This is just a simple example.
I am using jetty-util.jar for JSONPojoConverter, it supports nested pojos.

Hope this helps to someone.

[ynaik]

Need help with the Server Side sorting on ListGrid using GWT RPC mechanism

Hi,

Can you please post sample line of code to invoke the server side sorting in ListGrid Using GWT RPC.

How to enable the server side sorting on ListGrid?
on executeFetch, request.getSortBy() always shows null, how to set this value?

showcase example was not much of help, can somebody please post the client side sorting line of code vs server side sorting line of code

Thanks for your great support.

[paatal]

Pagination didn't work

hi all,
i found examples about list grid and google rpc on forum. it was clear everything.
but pagination does not work. here is my classes attached ..
i didn't know what is incorrect here

In RouterTab.java i have placed list grid.
RouterDataSource.java is my datasource class.
other is my service implementation

problem is what when i draw RouterTab all records are visible not only first 20,
which i defined by method listGrid.setDataPageSize(20); in RouterTab.java

help is urgent :(
Thanks In Advance.

____________________
Regards,
Paata Lominadze
Magticom LTD.

[paatal]

missed file

sorry i missed my server implementation file.
GwtRpcDataSource.java and FetchResult.java i took from this forum, if required i can post them.

[johndow777]

Well, even if you set 20 records smart gwt will fetch a little more, than 20. If you mean real paging you will not find one, because the paging is done by life grid with grid scrolling.

sorry i missed my server implementation file.
GwtRpcDataSource.java and FetchResult.java i took from this forum, if required i can post them.

[johndow777]

You have to implement the sorting logic on the server if you use rpc, SortBy returns the name of the column for asc or -column name for desc (i think?!?).
Client sorting is done automatically, by default by sorting all cached records. This can be tricky if you want server sorting you may want to invalidate the cache.

Hi,

Can you please post sample line of code to invoke the server side sorting in ListGrid Using GWT RPC.

How to enable the server side sorting on ListGrid?
on executeFetch, request.getSortBy() always shows null, how to set this value?

showcase example was not much of help, can somebody please post the client side sorting line of code vs server side sorting line of code

Thanks for your great support.

[paatal]

RE:

Thanks mnenchev for your quick reply...
yes you're right i want to create real paging grid,
is there any other way to achieve this?
i don't need life grid with grid scrolling .... i can't found any other grid ....

Well, even if you set 20 records smart gwt will fetch a little more, than 20. If you mean real paging you will not find one, because the paging is done by life grid with grid scrolling.

___________________
Thanks,
Paata Lominadze,
Magticom LTD.

[ynaik]

You have to implement the sorting logic on the server if you use rpc, SortBy returns the name of the column for asc or -column name for desc (i think?!?).
Client sorting is done automatically, by default by sorting all cached records. This can be tricky if you want server sorting you may want to invalidate the cache.

Thanks a lot mnenchev for your prompt reply ,

Do I have invalidateCache on HeaderClickEvent

listGrid.addHeaderClickHandler(new HeaderClickHandler() {

public void onHeaderClick(HeaderClickEvent event) {

listGrid.invalidateCache();
listGrid.setSortField(event.getFieldNum());

}
});

How can i set the Request.getSortBy() value in executeFetch Method ? Please Help

[johndow777]

I think this is done automatically?!?!

Thanks a lot mnenchev for your prompt reply ,

Do I have invalidateCache on HeaderClickEvent

listGrid.addHeaderClickHandler(new HeaderClickHandler() {

public void onHeaderClick(HeaderClickEvent event) {

listGrid.invalidateCache();
listGrid.setSortField(event.getFieldNum());

}
});

How can i set the Request.getSortBy() value in executeFetch Method ? Please Help

[johndow777]

There is no real paging grids, you must develop one. Btw i met somewhere example for smart gwt in some thread. Look for it.

Thanks mnenchev for your quick reply...
yes you're right i want to create real paging grid,
is there any other way to achieve this?
i don't need life grid with grid scrolling .... i can't found any other grid ....




___________________
Thanks,
Paata Lominadze,
Magticom LTD.

[ynaik]

I think this is done automatically?!?!

Yes , It is suppose to set this value automatically but it is not.

1) Any idea how to set sortState on ListGrid ?

listGrid.setSortState(?String ) , dunno how to set this input string value

which property of listGrid sets the DSRequest.getSortBy() value?

when i print the listGrid.getSortState(), i see the following values
listGrid.getSortState() = ({
fieldName:null,
sortDir:false
})

2) any sample code on server side sorting using simple smartgwt ListGrid with GWT RPC mechanism?

3) Can some one guide me on how to achieve server side sorting using GWT RPC ?

Thanks in advance

[johndow777]

//in ds :
	final String sortBy = request.getSortBy();
         someRPCservice.fetch(sortBy,..........).....
................
// in rpc impl fetch
	if (sortBy != null) {
			
				if (sortBy.charAt(0) == '-') {
			
					descendingSortOrder = true;
				} else {
					descendingSortOrder = false;
				}
			}
//        sql query using descendingSortOder

If you use the code from this thread it must work, check your datasources declarations?!

[ynaik]

//in ds :
	final String sortBy = request.getSortBy();
         someRPCservice.fetch(sortBy,..........).....
................
// in rpc impl fetch
	if (sortBy != null) {
			
				if (sortBy.charAt(0) == '-') {
			
					descendingSortOrder = true;
				} else {
					descendingSortOrder = false;
				}
			}
//        sql query using descendingSortOder

If you use the code from this thread it must work, check your datasources declarations?!

Thanks a ton, For some reason request.getSortBy(); is returning null always , dunno which property of ListGrid triggers this value ?

Please let me know if i have to set some special property to get this value, I will check all DS declarations, Thanks again "mnenchev", you are a Great help.

[ynaik]

Thanks a ton, For some reason request.getSortBy(); is returning null always , dunno which property of ListGrid triggers this value ?

Please let me know if i have to set some special property to get this value, I will check all DS declarations, Thanks again "mnenchev", you are a Great help.

I was able to obtain the Request.getSortBy() value after commenting the following line

listGrid.setCanSort(false);

If I comment it //listGrid.setCanSort(false); ,
then I get the column value using Request.getSortBy() & both the client & server side sorting are enabled.

When i uncomment it then Request.getSortBy() is always null & unable to do server side sorting.

How can i disable client side sorting & retain just the server side sorting ?

Thanks in advance.