Grid Loading via RPC
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class extends Ext.Component). The alias/xtype is listed next to the class name of
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static label next to the
method name. *See Static below.Below is an example class member that we can disect to show the syntax of a class member (the lookupComponent method as viewed from the Ext.button.Button class in this case).
Let's look at each part of the member row:
lookupComponent in this example)( item ) in this example)Ext.Component in this case). This may be omitted for methods that do not
return anything other than undefined or may display as multiple possible values
separated by a forward slash / signifying that what is returned may depend on the
results of the method call (i.e. a method may return a Component if a get method calls is
successful or false if unsuccessful which would be displayed as
Ext.Component/Boolean).PROTECTED in
this example - see the Flags section below)Ext.container.Container in this example). The source
class will be displayed as a blue link if the member originates from the current class
and gray if it is inherited from an ancestor or mixed-in class.view source in the example)item : Object in the example).undefined a "Returns" section
will note the type of class or object returned and a description (Ext.Component in the
example)Available since 3.4.0 - not pictured in
the example) just after the member descriptionDefaults to: false)The API documentation uses a number of flags to further commnicate the class member's function and intent. The label may be represented by a text label, an abbreviation, or an icon.
classInstance.method1().method2().etc();false is returned from
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method
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theme mixin
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Loading data to the grid via RPC, RequestFactory or other data transport.
Initializing the DataProxy for RPC communications.
Example of loading data with RPC:
private void createSimpleRpcPageLoadingGrid() {
// Bean property access definitions
PostProperties properties = GWT.create(PostProperties.class);
// Rpc Async Service
final ExampleServiceAsync rpcService = GWT.create(ExampleService.class);
// Rpc Data Proxy
DataProxy<PagingLoadConfig, PagingLoadResult<Post>> dataProxy =
new RpcProxy<PagingLoadConfig, PagingLoadResult<Post>>() {
@Override
public void load(PagingLoadConfig loadConfig, AsyncCallback<PagingLoadResult<Post>> callback) {
// Example of the loadConfig sending SortInfo for the RPC request.
List<? extends SortInfo> sortInfo = loadConfig.getSortInfo();
// RPC data request which contains the paging info and sort info.
rpcService.getPosts(loadConfig, callback);
}
};
// List Store
ListStore<Post> listStore = new ListStore<Post>(properties.id());
// Paging Loader
final PagingLoader<PagingLoadConfig, PagingLoadResult<Post>> pagingLoader =
new PagingLoader<PagingLoadConfig, PagingLoadResult<Post>>(dataProxy);
pagingLoader.setRemoteSort(true);
pagingLoader.addLoadHandler(new LoadResultListStoreBinding<PagingLoadConfig, Post,
PagingLoadResult<Post>>(listStore));
// Paging Tool Bar
PagingToolBar toolBar = new PagingToolBar(50);
toolBar.bind(pagingLoader);
// Columns
ColumnConfig<Post, String> forumColumn =
new ColumnConfig<Post, String>(properties.forum(), 150, "Forum");
ColumnConfig<Post, String> subjectColumn =
new ColumnConfig<Post, String>(properties.subject(), 150, "Subject");
List<ColumnConfig<Post, ?>> columns = new ArrayList<ColumnConfig<Post, ?>>();
columns.add(forumColumn);
columns.add(subjectColumn);
ColumnModel<Post> columnModel = new ColumnModel<Post>(columns);
// Grid
Grid<Post> grid = new Grid<Post>(listStore, columnModel) {
@Override
protected void onAfterFirstAttach() {
super.onAfterFirstAttach();
Scheduler.get().scheduleDeferred(new ScheduledCommand() {
@Override
public void execute() {
// Only start the load after this grid attaches to DOM.
pagingLoader.load();
}
});
}
};
grid.getView().setForceFit(true);
grid.setLoadMask(true);
grid.setLoader(pagingLoader);
grid.setColumnReordering(true);
// Grid Containers
FramedPanel panel = new FramedPanel();
panel.setCollapsible(true);
panel.setHeadingText("Loading Data with RPC");
panel.setPixelSize(400, 200);
panel.addStyleName("margin-10");
VerticalLayoutContainer container = new VerticalLayoutContainer();
container.setBorders(true);
container.add(grid, new VerticalLayoutData(1, 1));
container.add(toolBar, new VerticalLayoutData(1, -1));
panel.add(container);
widget.add(panel);
}
Swap out the PagingLoadConfig with FilterPagingLoadConfig and add the bean filtering configuration.
Example using the above snippet, notice the FilterPagingLoadConfig:
// Rpc Data Proxy
DataProxy<FilterPagingLoadConfig, PagingLoadResult<Post>> dataProxy =
new RpcProxy<FilterPagingLoadConfig, PagingLoadResult<Post>>() {
@Override
public void load(FilterPagingLoadConfig loadConfig, AsyncCallback<PagingLoadResult<Post>> callback) {
// RPC data request
rpcService.getPosts(loadConfig, callback);
}
};
// List Store
ListStore<Post> listStore = new ListStore<Post>(properties.id());
// Paging Filter Loader
final PagingLoader<FilterPagingLoadConfig, PagingLoadResult<Post>> pagingLoader =
new PagingLoader<FilterPagingLoadConfig, PagingLoadResult<Post>>(dataProxy) {
@Override
protected FilterPagingLoadConfig newLoadConfig() {
// Bean filtering configuration for sending the filtering config to server
return new FilterPagingLoadConfigBean();
}
};
pagingLoader.setRemoteSort(true);
pagingLoader.addLoadHandler(new LoadResultListStoreBinding<FilterPagingLoadConfig, Post,
PagingLoadResult<Post>>(listStore));
Configure the Grid filter UI options. More about setting up Grid Filtering.
// Grid Ui Filters
StringFilter<PostProxy> forumFilter = new StringFilter<PostProxy>(properties.forum());
StringFilter<PostProxy> subjectFilter = new StringFilter<PostProxy>(properties.subject());
GridFilters<PostProxy> filters = new GridFilters<PostProxy>();
filters.initPlugin(grid);
filters.setLocal(false);
filters.addFilter(forumFilter);
filters.addFilter(subjectFilter);
On the server side the loadConfig carries the filters sent with the request:
public PagingLoadResult<Post> getPosts(PagingLoadConfig loadConfig) {
List<FilterConfig> filters = loadConfig.getFilters();
String type = filters.get(0).getType();
String test = filters.get(0).getValue();
String path = filters.get(0).getField();
String comparison = filters.get(0).getComparison();
// Do some server filter magic...
//...
}
Sending the Sort to the server.
PagingLoadConfig contains the SortInfo and can be sent back to the server. Set the remote sort to true for sending the SortInfo in the PagingLoadConfig:
pagingLoader.setRemoteSort(true);
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