com.smartgwt.client.data

Class XJSONDataSource

java.lang.Object

com.smartgwt.client.core.BaseClass

com.smartgwt.client.data.DataSource

com.smartgwt.client.data.XJSONDataSource

All Implemented Interfaces:

com.google.gwt.event.shared.HasHandlers, HasHandleErrorHandlers

public class XJSONDataSource
extends DataSource

A DataSource preconfigured to use the "scriptInclude" transport (sometimes called "JSONP") for cross-domain calls to JSON services.

To use this DataSource, provide the URL of the service as DataSource.dataURL, and provide fields that describe the structure of the data you want to extract from the service's response.

DataSource.recordXPath and DataSourceField.valueXPath can be used to extract data from the JSON structure returned by the service. See Client-Side Data Integration for an overview of how to control what parts of the JSON structure are included in the DSResponse object, and hence provided to DataBoundComponents that are bound to this DataSource.

This XJSONDataSource is really a subclass of DataSource with just a few property settings:

     dataFormat : "json",
     dataTransport : "scriptInclude"
     callbackParam : "callback"
  

If you are also writing the server side code to respond to requests from this DataSource, see the tutorial provided by Yahoo! for a good overview of how this transport mechanism works. Note, as indicated in the tutorial above, the server is responsible for writing out not just the data, but also a JavaScript function call that tells the client that the response has arrived. The client passes the name of the function to call as the "callback" URL parameter.

NOTE: if you use this DataSource to contact Yahoo web services, remember to include output=json in the dataURL, as well as a Yahoo developer ID.

Field Summary

Fields inherited from class com.smartgwt.client.core.BaseClass

config, configOnly, factoryCreated, factoryProperties, id, scClassName

Constructor Summary

Constructors

Constructor and Description
XJSONDataSource()
XJSONDataSource(com.google.gwt.core.client.JavaScriptObject jsObj)

Method Summary

Modifier and Type	Method and Description
com.google.gwt.core.client.JavaScriptObject	create()
static XJSONDataSource	getOrCreateRef(com.google.gwt.core.client.JavaScriptObject jsObj)
static void	setDefaultProperties(XJSONDataSource xJSONDataSourceProperties) Class level method to set the default properties of this class.

Methods inherited from class com.smartgwt.client.data.DataSource

addData, addData, addData, addField, addHandleErrorHandler, addSearchOperator, applyFilter, applyFilter, canFlattenCriteria, clearValueAtDataPath, clearValueAtDataPath, clearValueAtDataPath, clearValueAtDataPath, cloneDSRequest, cloneDSResponse, combineCriteria, combineCriteria, combineCriteria, compareCriteria, compareCriteria, compareCriteria, compareDates, convertCriteria, convertCriteria, convertDataSourceCriteria, convertDataSourceCriteria, convertRelativeDates, convertRelativeDates, convertRelativeDates, convertRelativeDates, copyCriteria, copyRecord, copyRecords, downloadFile, downloadFile, downloadFile, evaluateCriterion, execute, exportClientData, exportClientDataStatic, exportData, exportData, exportData, exportData, fetchData, fetchData, fetchData, fetchData, fetchRecord, fetchRecord, fetchRecord, fieldMatchesFilter, fieldMatchesFilter, filterData, filterData, filterData, filterData, flattenCriteria, get, get, getAddGlobalId, getAdvancedCriteriaDescription, getAllowAdvancedCriteria, getAutoCacheAllData, getAutoConvertRelativeDates, getAutoDeriveTitles, getAutoDiscoverTree, getAutoTitle, getCacheAcrossOperationIds, getCacheAllData, getCacheAllOperationId, getCacheData, getCacheMaxAge, getCallbackParam, getCanMultiSort, getChildrenField, getClientOnly, getClientOnlyDataSource, getClientOnlyDataSource, getClientOnlyDataSource, getClientOnlyResponse, getCriteriaPolicy, getDataField, getDataFormat, getDataProtocol, getDataSource, getDataSource, getDataTransport, getDataURL, getDeepCloneOnEdit, getDefaultParams, getDefaultTextMatchStyle, getDescriptionField, getDiscoverTreeSettings, getDisplayValue, getDropExtraFields, getDropUnknownCriteria, getFetchDataURL, getFetchDataURL, getField, getFieldAutoTitle, getFieldCriterion, getFieldForDataPath, getFieldNames, getFieldNames, getFieldOperators, getFieldOperators, getFields, getFieldValue, getFieldValue, getFieldValue, getFieldValue, getFieldValue, getFieldValue, getFieldValue, getFile, getFileURL, getFileURL, getFileURL, getFileVersion, getGlobalNamespaces, getIconField, getIgnoreTextMatchStyleCaseSensitive, getImplicitCriteria, getInfoField, getInheritsFrom, getJsObj, getJsonPrefix, getJsonSuffix, getLegalChildTags, getLoaderURL, getOperationBindings, getPatternEscapeChar, getPatternMultiWildcard, getPatternMultiWildcardAsString, getPatternMultiWildcardAsStringArray, getPatternSingleWildcard, getPatternSingleWildcardAsString, getPatternSingleWildcardAsStringArray, getPluralTitle, getPreventHTTPCaching, getPrimaryKeyField, getPrimaryKeyFieldName, getPrimaryKeyFieldNames, getPrimaryKeyFields, getProgressiveLoading, getQualifyColumnNames, getRecordName, getRecordXPath, getRequestProperties, getRequiredMessage, getResultBatchSize, getResultSetClass, getResultTreeClass, getSchemaNamespace, getSendExtraFields, getSendParentNode, getServiceNamespace, getShowLocalFieldsOnly, getShowPrompt, getSkipJSONValidation, getSortBy, getSortSpecifiers, getStrictSQLFiltering, getTagName, getTestData, getTitle, getTitleField, getTranslatePatternOperators, getTrimMilliseconds, getTypeOperators, getTypeOperators, getTypeOperators, getUseFlatFields, getUseHttpProxy, getUseLocalValidators, getUseOfflineStorage, getUseParentFieldOrder, getUseStrictJSON, getUseTestDataFetch, getValidateRelatedRecords, hasAllData, hasFile, hasFileVersion, invalidateCache, isCreated, isFlatCriteria, listFiles, listFileVersions, load, load, load, loadWithParents, loadWithParents, loadWithParents, makeFileSpec, onInit, performCustomOperation, performCustomOperation, performCustomOperation, performCustomOperation, processResponse, recordsAreEqual, recordsAsText, recordsAsText, recordsFromText, recordsFromText, recordsFromXML, registerID, removeData, removeData, removeData, removeFile, removeFile, removeFile, removeFileVersion, removeFileVersion, renameFile, renameFile, saveFile, saveFile, saveValueViaDataPath, saveValueViaDataPath, saveValueViaDataPath, saveValueViaDataPath, saveValueViaDataPath, saveValueViaDataPath, saveValueViaDataPath, saveValueViaDataPath, saveValueViaDataPath, saveValueViaDataPath, saveValueViaDataPath, saveValueViaDataPath, saveValueViaDataPath, saveValueViaDataPath, saveValueViaDataPath, saveValueViaDataPath, saveValueViaDataPath, saveValueViaDataPath, saveValueViaDataPath, saveValueViaDataPath, saveValueViaDataPath, saveValueViaDataPath, saveValueViaDataPath, saveValueViaDataPath, saveValueViaDataPath, saveValueViaDataPath, saveValueViaDataPath, saveValueViaDataPath, saveValueViaDataPath, saveValueViaDataPath, saveValueViaDataPath, saveValueViaDataPath, setAddGlobalId, setAllowAdvancedCriteria, setAutoCacheAllData, setAutoConvertRelativeDates, setAutoDeriveTitles, setAutoDiscoverTree, setCacheAcrossOperationIds, setCacheAllData, setCacheAllOperationId, setCacheData, setCacheMaxAge, setCallbackParam, setCanMultiSort, setChildrenField, setClientOnly, setCriteriaPolicy, setDataField, setDataFormat, setDataProtocol, setDataTransport, setDataURL, setDeepCloneOnEdit, setDefaultParams, setDefaultProperties, setDefaultTextMatchStyle, setDescriptionField, setDiscoverTreeSettings, setDropExtraFields, setDropUnknownCriteria, setEnumConstantProperty, setEnumOrdinalProperty, setEnumTranslateStrategy, setFields, setGlobalNamespaces, setHandleErrorCallback, setIconField, setID, setIgnoreTextMatchStyleCaseSensitive, setImplicitCriteria, setInfoField, setInheritsFrom, setInheritsFrom, setJsonPrefix, setJsonSuffix, setLoaderURL, setOperationBindings, setPatternEscapeChar, setPatternMultiWildcard, setPatternMultiWildcard, setPatternSingleWildcard, setPatternSingleWildcard, setPluralTitle, setPreventHTTPCaching, setProgressiveLoading, setQualifyColumnNames, setRecordName, setRecordXPath, setRequestProperties, setRequiredMessage, setResultBatchSize, setResultSetClass, setResultTreeClass, setSendExtraFields, setSendParentNode, setServiceNamespace, setShowLocalFieldsOnly, setShowPrompt, setSkipJSONValidation, setStrictSQLFiltering, setTagName, setTestData, setTitle, setTitleField, setTranslatePatternOperators, setTrimMilliseconds, setTypeOperators, setTypeOperators, setUseFlatFields, setUseHttpProxy, setUseLocalValidators, setUseOfflineStorage, setUseParentFieldOrder, setUseStrictJSON, setUseTestDataFetch, setValidateRelatedRecords, setXmlNamespaces, splitCriteria, supportsAdvancedCriteria, supportsTextMatchStyle, transformRequest, transformResponse, updateCaches, updateCaches, updateData, updateData, updateData, useOfflineResponse, validateData, validateData, validateData, viewFile, viewFile, viewFile, xmlSerialize, xmlSerialize, xmlSerialize, xmlSerialize, xmlSerialize

Methods inherited from class com.smartgwt.client.core.BaseClass

applyFactoryProperties, asSGWTComponent, createJsObj, destroy, doAddHandler, doInit, error, error, errorIfNotCreated, fireEvent, getAttribute, getAttributeAsBoolean, getAttributeAsDate, getAttributeAsDouble, getAttributeAsElement, getAttributeAsFloat, getAttributeAsInt, getAttributeAsJavaScriptObject, getAttributeAsMap, getAttributeAsString, getAttributeAsStringArray, getClassName, getConfig, getHandlerCount, getID, getOrCreateJsObj, getRef, getScClassName, getTestInstance, hasAutoAssignedID, internalSetID, internalSetID, isConfigOnly, isFactoryCreated, onBind, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setConfig, setConfigOnly, setFactoryCreated, setJavaScriptObject, setProperty, setProperty, setProperty, setProperty, setScClassName

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface com.google.gwt.event.shared.HasHandlers

fireEvent

Constructor Detail

XJSONDataSource

public XJSONDataSource()

XJSONDataSource

public XJSONDataSource(com.google.gwt.core.client.JavaScriptObject jsObj)

Method Detail

getOrCreateRef

public static XJSONDataSource getOrCreateRef(com.google.gwt.core.client.JavaScriptObject jsObj)

create

public com.google.gwt.core.client.JavaScriptObject create()

Overrides:

create in class DataSource

setDefaultProperties

public static void setDefaultProperties(XJSONDataSource xJSONDataSourceProperties)

Class level method to set the default properties of this class. If set, then all existing and subsequently created instances of this class will automatically have default properties corresponding to the properties set on the SmartGWT class instance passed to this function before its underlying SmartClient JS object was created. This is a powerful feature that eliminates the need for users to create a separate hierarchy of subclasses that only alter the default properties of this class. Can also be used for skinning / styling purposes.

Note: This method is intended for setting default attributes only and will affect all instances of the underlying class (including those automatically generated in JavaScript). This method should not be used to apply standard EventHandlers or override methods for a class - use a custom subclass instead. Calling this method after instances have been created can result in undefined behavior, since it bypasses any setters and a class instance may have already examined a particular property and not be expecting any changes through this route.

Parameters:

xJSONDataSourceProperties - properties that should be used as new defaults when instances of this class are created

See Also:

SGWTProperties