This example demonstrates how to serialize and use criteria filters for a ListGrid.
You must perform the following steps:
A working example is available in the attachment. |
<DataSource ID="savedSearch" serverType="sql" tableName="savedSearch" titleField="name"> <fields> <field name="id" type="sequence" hidden="true" primaryKey="true" /> <field name="type" type="text" length="255" hidden="true" required="true" /> <field name="name" type="text" title="Name" length="255" required="true" /> <field name="criteria" type="text" hidden="true" length="4000" required="true" /> </fields> </DataSource> |
You need to add the DataSource to the application, and create a schema in the database (you can use the "Smart GWT Admin Console" to do this). Please refer to the "Smart GWT Quick Start Guide" ("Data Binding" chapter under the "DataSources" section). |
The ListGrid can use any DataSource. We will use the "supplyItem" DataSource.
private ListGrid createListGrid() { ListGrid result = new ListGrid(); result.setHeight(450); result.setCanEdit(false); result.setDataSource(supplyItemDataSource); result.setSortField("itemID"); return result; } |
The saved search filter uses the "savedSearch" DataSource filtering data by type. It uses the "supplyItem" DataSource ID as the type value (ComboBoxItem form field).
private DynamicForm createFilterForm() { DynamicForm result = new DynamicForm(); nameComboBoxItem = new ComboBoxItem(); nameComboBoxItem.setDisplayField("name"); nameComboBoxItem.setValueField("id"); nameComboBoxItem.setTitle("Filter"); nameComboBoxItem.setWidth(200); nameComboBoxItem.setEmptyDisplayValue("All Records"); nameComboBoxItem.setShowAllOptions(true); nameComboBoxItem.setOptionDataSource(savedSearchDataSource); nameComboBoxItem.setFetchMissingValues(false); nameComboBoxItem.setCachePickListResults(false); // filter data by item datasource AdvancedCriteria criteria = new AdvancedCriteria("type", OperatorId.EQUALS, dataSource.getID()); nameComboBoxItem.setOptionCriteria(criteria); nameComboBoxItem.addChangedHandler(new ChangedHandler() { @Override public void onChanged(ChangedEvent event) { ComboBoxItem item = (ComboBoxItem) event.getItem(); ListGridRecord record = item.getSelectedRecord(); if (record == null) { updateSavedSearch.disable(); removeSavedSearch.disable(); } else { updateSavedSearch.enable(); removeSavedSearch.enable(); } if (record != null) { Criteria newCriteria = new AdvancedCriteria(JSON.decode(record.getAttribute("criteria"))); listGrid.fetchData(newCriteria); } else { listGrid.fetchData(); } } }); result.setFields(nameComboBoxItem); return result; } |
To create/update the saved search a modal window is used. It contains a form (DynamicForm) for editing data ("savedSearch" DataSource). To dynamically create filtering rules use a FilterBuilder with the "supplyItem" DataSource.
private DynamicForm createForm() { DynamicForm result = new DynamicForm(); result.setWidth(700); result.setMargin(5); result.setUseAllDataSourceFields(true); result.setDataSource(dataSource); HeaderItem headerItem = new HeaderItem(); headerItem.setDefaultValue("New search"); TextItem nameItem = new TextItem("name"); CanvasItem criteriaItem = new CanvasItem("criteriaFilter", "Criteria"); filter = new FilterBuilder(); filter.setDataSource(itemDataSource); criteriaItem.setCanvas(filter); ButtonItem submitItem = new ButtonItem("submit", "Search"); submitItem.addClickHandler((ClickHandler) new ClickHandler() { @Override public void onClick(ClickEvent event) { JSONEncoder encoder = new JSONEncoder(); encoder.setDateFormat(JSONDateFormat.DATE_CONSTRUCTOR); String criteriaValue = JSON.encode(filter.getCriteria().getJsObj(), encoder); form.setValue("criteria", criteriaValue); form.setValue("type", itemDataSource.getID()); form.submit(new DSCallback() { @Override public void execute(DSResponse response, Object rawData, DSRequest request) { EditSavedSearchWindow.this.record = response.getData()[0]; if (updateSavedSearchCallback != null) { updateSavedSearchCallback.onUpdate(); } hide(); } }); } }); result.setFields(headerItem, nameItem, criteriaItem, submitItem); return result; } |
private void onUpdateSavedSearch(Record record) { nameComboBoxItem.setValue(record.getAttributeAsInt("id")); ... Criteria criteria = new AdvancedCriteria(JSON.decode(record.getAttribute("criteria"))); listGrid.setCriteria(criteria); listGrid.fetchData(criteria); } |