# Yahoo! UI Library

### AutoComplete Widget 2.4.1

Yahoo! UI Library > autocomplete > YAHOO.widget.DS_ScriptNode

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## Class YAHOO.widget.DS_ScriptNode - extends YAHOO.widget.DataSource

Implementation of YAHOO.widget.DataSource using the Get Utility to generate dynamic SCRIPT nodes for data retrieval.

### Constructor

YAHOO.widget.DS_ScriptNode `( sUri , aSchema , oConfigs )`

Parameters:
  `sUri <String>` URI to the script location that will return data.
  `aSchema <String[]>` Data schema definition of results.
  `oConfigs <Object>` (optional) Object literal of config params.

### Properties

#### _nId `- private static Number`

Unique ID to track requests.

#### _nPending `- private static Number`

Counter for pending requests. When this is 0, it is safe to purge callbacks array.

#### asyncMode `- String`

Defines request/response management in the following manner:

ignoreStaleResponses
  Send all requests, but handle only the response for the most recently sent request.
allowAll
  Send all requests and handle all responses.

Default Value: "allowAll"

#### callbacks `- static Function[]`

Global array of callback functions, one for each request sent.

#### getUtility `- Object`

Alias to YUI Get Utility. Allows implementers to specify their own subclasses of the YUI Get Utility.
Default Value: YAHOO.util.Get

#### scriptCallbackParam `- String`

Callback string parameter name sent to scriptURI. For instance, requests will be sent to <scriptURI>?<scriptCallbackParam>=callbackFunction
Default Value: "callback"

#### scriptQueryParam `- String`

Query string parameter name sent to scriptURI. For instance, requests will be sent to <scriptURI>?<scriptQueryParam>=queryString
Default Value: "query"

#### scriptURI `- String`

URI to the script that returns data.

#### Properties inherited from YAHOO.widget.DataSource:

`_aCache, _sName, maxCacheEntries, queryMatchCase, queryMatchContains, queryMatchSubset`

### Methods

#### _bumpPendingDown

`private void _bumpPendingDown ( )`
Any success/failure response should decrement counter.

Returns: `void`

#### doQuery

`void doQuery ( oCallbackFn , sQuery , oParent )`
Queries the live data source. Results are passed back to a callback function.

Parameters:
  `oCallbackFn <HTMLFunction>` Callback function defined by oParent object to which to return results.
  `sQuery <String>` Query string.
  `oParent <Object>` The object instance that has requested data.

Returns: `void`

#### handleResponse

`void handleResponse ( oResponse , oCallbackFn , sQuery , oParent )`
Parses JSON response data into an array of result objects and passes it to the callback function.

Parameters:
  `oResponse <Object>` The raw response data to parse.
  `oCallbackFn <HTMLFunction>` Callback function defined by oParent object to which to return results.
  `sQuery <String>` Query string.
  `oParent <Object>` The object instance that has requested data.

Returns: `void`

#### Methods inherited from YAHOO.widget.DataSource:

`_addCacheElem, _doQueryCache, _init, doQuery, flushCache, getResults, toString`

#### Events inherited from YAHOO.widget.DataSource:

`cacheFlushEvent, cacheQueryEvent, dataErrorEvent, getCachedResultsEvent getResultsEvent queryEvent`

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