You're running into an async problem.
The call back happens asynchronusly, meaning, just because you kick
off the RPC service does not mean that designStrings will have a value
in it before you execute the code after you kick off the RPC.
Get rid of anything that uses designStrings outside of the callback or
loadDesigns. Looking over your code quickly, what you want to do is in
loadDesign, iterate through result and put it into your Combo Box.
On Jul 8, 3:31 am, npradeeptha <nipuna.ro...@gmail.com> wrote:
> Heres my code.. I'm using GWT 2.0.3 with smartGWT 2.2. I think this is
> a GWT related question..
>
> [CODE]
> /**
> *
> */
> package org.gwt.venus.client;
>
> import com.google.gwt.core.client.EntryPoint;
> import com.google.gwt.user.client.rpc.AsyncCallback;
> import com.google.gwt.user.client.ui.RootPanel;
>
> /**
> * @author npradeeptha
> *
> */
> import com.smartgwt.client.data.DataSource;
> import com.smartgwt.client.data.DateRange;
> import com.smartgwt.client.data.RelativeDate;
> import com.smartgwt.client.widgets.form.DynamicForm;
> import com.smartgwt.client.widgets.form.fields.ComboBoxItem;
> import com.smartgwt.client.widgets.form.fields.DateRangeItem;
> import com.smartgwt.client.widgets.grid.ListGrid;
> import com.smartgwt.client.widgets.grid.ListGridField;
> import com.smartgwt.client.widgets.layout.HLayout;
> import com.smartgwt.client.widgets.layout.VLayout;
>
> public class VenusData implements EntryPoint {
>
> /* (non-Javadoc)
> * @see com.google.gwt.core.client.EntryPoint#onModuleLoad()
> */
> VenusDataSource vds = new VenusDataSource();
> private RpcCallServiceAsync rpc = RpcInit.initRpc();
> String[] designstrings = null;
>
> @Override
> public void onModuleLoad() {
> // TODO Auto-generated method stub
> initializeDesignsArray();
> DataSource ds = vds.getDs();
>
> VLayout layout = new VLayout(8);
>
> HLayout searchFields = new HLayout();
> searchFields.setBackgroundColor("Cyan");
>
> DynamicForm searchForm = new DynamicForm();
> ComboBoxItem cmbDesigns = new ComboBoxItem("cmbDesigns", "Design");
> ComboBoxItem cmbCriteria = new ComboBoxItem("cmbCriteria",
> "Criteria");
> cmbDesigns.setWidth("*");
> cmbCriteria.setWidth("*");
> cmbDesigns.setType("comboBox");
>
> //cmbDesigns.setValueMap(designstrings);
> cmbCriteria.setValueMap("FAST","HARSHA_FAST","NIJ_1");
>
> // Inline FilterEditor Example (MiniDateRangeItem)
>
> final DateRangeItem rangeItem = new DateRangeItem("Date");
> rangeItem.setWidth("*");
> rangeItem.setShowTitle(false);
> rangeItem.setAllowRelativeDates(true);
>
> DateRange dateRange = new DateRange();
> dateRange.setRelativeStartDate(new RelativeDate("m"));
> dateRange.setRelativeEndDate(new RelativeDate("m"));
> rangeItem.setValue(dateRange);
>
> searchForm.setNumCols(6);
> searchForm.setFields(cmbDesigns,cmbCriteria, rangeItem);
> searchFields.addMember(searchForm);
>
> // Create a ListGrid displaying data from the worldDS and also
> displaying a FilterEditor
> final ListGrid dataGrid = new ListGrid();
> dataGrid.setWidth(655);
> dataGrid.setHeight(240);
> searchFields.setWidth(650);
>
> ListGridField builds = new ListGridField("build", "Build");
> builds.setWidth(130);
> ListGridField criteria = new ListGridField("criteria",
> "Criteria");
> ListGridField design = new ListGridField("design", "Design");
> ListGridField lut = new ListGridField("lut", "LUT");
> ListGridField date = new ListGridField("date", "Date");
> ListGridField lut4 = new ListGridField("lut4", "Eq LUT4");
> ListGridField ble = new ListGridField("ble", "BLE FFs");
> ListGridField slack = new ListGridField("slack", "Slack");
>
> dataGrid.setFields(builds,criteria,design,date,slack,lut,lut4,ble);
>
> dataGrid.setDataSource(ds);
> dataGrid.setAutoFetchData(true);
> System.out.println(designstrings.length); //*** Gives a null
> pointer error.
> cmbDesigns.setValueMap(designstrings); //does not set any values
> since designstrings is null.
>
> layout.addMember(searchFields);
> layout.addMember(dataGrid);
>
> layout.draw();
> RootPanel.get("content").add(layout);
>
> }
>
> public void initializeDesignsArray(){
> rpc.getDesign(new AsyncCallback<Design[]>() {
>
> @Override
> public void onFailure(Throwable caught) {
> System.out.println("Design callback failed");
>
> }
>
> @Override
> public void onSuccess(Design[] result) {
> //System.out.println(result.length);
> String[] designs = new String[result.length];
>
> for(int i=0; i<designs.length; i++){
>
> designs[i] = result[i].design;
> System.out.println(designs[i]); //
> Prints the items so the
> callback works and gets data..
>
> }
> loadDesigns(designs);
>
> }
> });
> }
>
> public void loadDesigns(String[] result) {
> designstrings = result;
> System.out.println(designstrings.length); //works too
>
> }
>
> }
>
> [/CODE]
>
> I have commented on the code where it works and goes wrong.. The
> CallBack works perfectly but the variable is always null. Please
> explain whats going on. Thanks!!
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