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Form Data bound Dependent Selects Sample (Smart GWT)

/*  * SmartGWT (GWT for SmartClient)  * Copyright 2008 and beyond, Isomorphic Software, Inc.  *  * SmartGWT is free software; you can redistribute it and/or modify it  * under the terms of the GNU Lesser General Public License version 3  * as published by the Free Software Foundation.  SmartGWT is also  * available under typical commercial license terms - see  * http://smartclient.com/license  * This software is distributed in the hope that it will be useful,  * but WITHOUT ANY WARRANTY; without even the implied warranty of  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU  * Lesser General Public License for more details.  */ package com.smartgwt.sample.showcase.client; import com.google.gwt.core.client.EntryPoint; import com.google.gwt.user.client.ui.RootPanel; import com.smartgwt.client.data.Criteria; import com.smartgwt.client.data.DataSource; import com.smartgwt.client.data.fields.DataSourceBooleanField; import com.smartgwt.client.data.fields.DataSourceDateField; import com.smartgwt.client.data.fields.DataSourceEnumField; import com.smartgwt.client.data.fields.DataSourceFloatField; import com.smartgwt.client.data.fields.DataSourceIntegerField; import com.smartgwt.client.data.fields.DataSourceLinkField; import com.smartgwt.client.data.fields.DataSourceTextField; import com.smartgwt.client.widgets.Canvas; import com.smartgwt.client.widgets.form.DynamicForm; import com.smartgwt.client.widgets.form.fields.SelectItem; import com.smartgwt.client.widgets.form.fields.events.ChangedEvent; import com.smartgwt.client.widgets.form.fields.events.ChangedHandler; import com.smartgwt.client.widgets.form.validator.FloatPrecisionValidator; import com.smartgwt.client.widgets.form.validator.FloatRangeValidator; public class Showcase implements EntryPoint {   public void onModuleLoad() {     RootPanel.get().add(getViewPanel());   }   public Canvas getViewPanel() {     final DynamicForm form = new DynamicForm();     form.setWidth(500);     form.setNumCols(4);     DataSource itemSupplyDS = ItemSupplyXmlDS.getInstance();     DataSource supplyCategoryDS = SupplyCategoryXmlDS.getInstance();     final SelectItem categoryItem = new SelectItem();     categoryItem.setName("categoryName");     categoryItem.setPickListWidth(210);     categoryItem.setTitle("Category");     categoryItem.setOptionDataSource(supplyCategoryDS);     categoryItem.addChangedHandler(new ChangedHandler() {       public void onChanged(ChangedEvent event) {         form.clearValue("itemName");       }     });     SelectItem itemName = new SelectItem() {       protected Criteria getPickListFilterCriteria() {         String category = (String) categoryItem.getValue();         Criteria criteria = new Criteria("category", category);         return criteria;       }     };     itemName.setName("itemName");     itemName.setTitle("Item");     itemName.setPickListWidth(250);     itemName.setOptionDataSource(itemSupplyDS);     form.setItems(categoryItem, itemName);     return form;   } } class SupplyCategoryXmlDS extends DataSource {   private static SupplyCategoryXmlDS instance = null;   public static SupplyCategoryXmlDS getInstance() {       if (instance == null) {           instance = new SupplyCategoryXmlDS("supplyCategoryDS");       }       return instance;   }   public SupplyCategoryXmlDS(String id) {       setID(id);       setRecordXPath("/List/supplyCategory");       DataSourceTextField itemNameField = new DataSourceTextField("categoryName", "Item", 128, true);       itemNameField.setPrimaryKey(true);       DataSourceTextField parentField = new DataSourceTextField("parentID", null);       parentField.setHidden(true);       parentField.setRequired(true);       parentField.setRootValue("root");       parentField.setForeignKey("supplyCategoryDS.categoryName");       setFields(itemNameField, parentField);       setDataURL("ds/test_data/supplyCategory.data.xml");              setClientOnly(true);   } } class ItemSupplyXmlDS extends DataSource {   private static ItemSupplyXmlDS instance = null;   public static ItemSupplyXmlDS getInstance() {     if (instance == null) {       instance = new ItemSupplyXmlDS("supplyItemDS");     }     return instance;   }   public ItemSupplyXmlDS(String id) {     setID(id);     setRecordXPath("/List/supplyItem");     DataSourceIntegerField pkField = new DataSourceIntegerField("itemID");     pkField.setHidden(true);     pkField.setPrimaryKey(true);     DataSourceTextField itemNameField = new DataSourceTextField("itemName", "Item Name", 128, true);     DataSourceTextField skuField = new DataSourceTextField("SKU", "SKU", 10, true);     DataSourceTextField descriptionField = new DataSourceTextField("description", "Description",         2000);     DataSourceTextField categoryField = new DataSourceTextField("category", "Category", 128, true);     categoryField.setForeignKey("supplyCategoryDS.categoryName");     DataSourceEnumField unitsField = new DataSourceEnumField("units", "Units", 5);     unitsField.setValueMap("Roll", "Ea", "Pkt", "Set", "Tube", "Pad", "Ream", "Tin", "Bag", "Ctn",         "Box");     DataSourceFloatField unitCostField = new DataSourceFloatField("unitCost", "Unit Cost", 5);     FloatRangeValidator rangeValidator = new FloatRangeValidator();     rangeValidator.setMin(0);     rangeValidator.setErrorMessage("Please enter a valid (positive) cost");     FloatPrecisionValidator precisionValidator = new FloatPrecisionValidator();     precisionValidator.setPrecision(2);     precisionValidator.setErrorMessage("The maximum allowed precision is 2");     unitCostField.setValidators(rangeValidator, precisionValidator);     DataSourceBooleanField inStockField = new DataSourceBooleanField("inStock", "In Stock");     DataSourceDateField nextShipmentField = new DataSourceDateField("nextShipment", "Next Shipment");     setFields(pkField, itemNameField, skuField, descriptionField, categoryField, unitsField,         unitCostField, inStockField, nextShipmentField);     setDataURL("ds/test_data/supplyItem.data.xml");     setClientOnly(true);   } } class CountryXmlDS extends DataSource {   private static CountryXmlDS instance = null;   public static CountryXmlDS getInstance() {     if (instance == null) {       instance = new CountryXmlDS("countryDS");     }     return instance;   }   public CountryXmlDS(String id) {     setID(id);     setRecordXPath("/List/country");     DataSourceIntegerField pkField = new DataSourceIntegerField("pk");     pkField.setHidden(true);     pkField.setPrimaryKey(true);     DataSourceTextField countryCodeField = new DataSourceTextField("countryCode", "Code");     countryCodeField.setRequired(true);     DataSourceTextField countryNameField = new DataSourceTextField("countryName", "Country");     countryNameField.setRequired(true);     DataSourceTextField capitalField = new DataSourceTextField("capital", "Capital");     DataSourceTextField governmentField = new DataSourceTextField("government", "Government", 500);     DataSourceBooleanField memberG8Field = new DataSourceBooleanField("member_g8", "G8");     DataSourceTextField continentField = new DataSourceTextField("continent", "Continent");     continentField.setValueMap("Europe", "Asia", "North America", "Australia/Oceania",         "South America", "Africa");     DataSourceDateField independenceField = new DataSourceDateField("independence", "Nationhood");     DataSourceFloatField areaField = new DataSourceFloatField("area", "Area (km²)");     DataSourceIntegerField populationField = new DataSourceIntegerField("population", "Population");     DataSourceFloatField gdpField = new DataSourceFloatField("gdp", "GDP ($M)");     DataSourceLinkField articleField = new DataSourceLinkField("article", "Info");     setFields(pkField, countryCodeField, countryNameField, capitalField, governmentField,         memberG8Field, continentField, independenceField, areaField, populationField, gdpField,         articleField);     setDataURL("ds/test_data/country.data.xml");     setClientOnly(true);   } }                  SmartGWT.zip( 9,880 k)