RTI_JSON Function (OI9) [Revelation On-Line Wiki]

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====== RTI_JSON Function (OI9) ======


 
==== Description ====
 
The RTI_JSON function allows you to evaluate either a javascript function or a JSON (JavaScript Object Notation) expression.  After passing in a javascript function or a JSON expression, you can invoke the function or evaluate the expression, and retrieve results.

RTI_JSON uses a javascript implementation of the JSON parser.

==== Syntax ====
 
RTI_JSON(handle, action, param1, param2, param3)
 
==== Parameters ====
 
The function has the following parameters:

^Action^Description^
|Parse|Handle: the javascript function or JSON expression\\ \\ Return value: the handle to use for subsequent RTI_JSON calls if successful, or 0 if unsuccessful|
|New|Handle: unused, pass in empty string (“”)\\ \\ Param1: the type of variable to create.  Valid types include “OBJECT” (for a generic object), “NUMBER”, “STRING”, “BOOLEAN”, “DATE”, “REGEXP”, and “ARRAY”\\ \\ Param2: the initial value of the created variable\\ \\ Return value: the evaluated variable object|
|Stringify|Handle: the variable that contains the previously-created javascript or JSON object\\ \\ Return value: the string representation of the JSON object|
|GetValue|Handle: the variable that contains the previously-created javascript or JSON object\\ \\ Param1: the name of the variable whose value should be retrieved.  This can be an array element (enclosed in square braces, ie, “[1]”) if accessing an array object.\\ \\ Return value: the specified variable’s value|
|SetValue|Handle: the variable that contains the previously-created javascript or JSON object\\ \\ Param1: the name of the variable whose value should be set.  This can be an array element (enclosed in square braces, ie, “[1]”) if accessing an array object.\\ \\ Param2: the value to which the variable should be set\\ \\ Param3: “1” if the value represents an object rather than a simple string\\ \\ Return value: 0 if successful, or OLE error code|
|GetProperties|Handle: the variable that contains the previously-created javascript or JSON object\\ \\ Return value: @VM delimited list of the properties of the javascript or JSON object|
|GetMethods|Handle: the variable that contains the previously-created javascript or JSON object\\ \\ Return value: @VM delimited list of the methods of the javascript or JSON object|
|Eval|Handle: unused, pass in empty string (“”)\\ \\ Param1: javascript source or JSON string\\ \\ Return value: the evaluated object|


 
==== Returns ====
 
 
 
==== Remarks ====
 
 
 
==== See Also ====
 
 
 
==== Example ====
 

Example 1:

<code>
myObject = RTI_JSON('', 'New', 'OBJECT')  ; * generic object

myNumber = RTI_JSON('', 'New', 'Number', '21')

myString = RTI_JSON('', 'New', 'String', 'Hello World')

myBool   = RTI_JSON('', 'New', 'Boolean', '1')

mydate   = RTI_JSON('', 'New', 'Date', date(), time())  ; * javascript date object

myRegEx  = RTI_JSON('', 'New', 'REGEXP', "\bt[a-z]+\b") ; * regular expression

myArray  = RTI_JSON('', 'New', 'ARRAY', '"A","B","C"')

x = Rti_JSON(MyArray, 'SetValue', '[3]', 'D')

v1 = Rti_JSON(MyArray, 'GetValue', '[0]') ;* v1 should now contain “A”
</code>
 

Example 2:

<code>
* given the following JSON string:

* { "rti_table":"BOOKS", "id":"1021","BOOK_ID":"1021","TITLE":"China%20and%20the%20Manchus","AUTHOR":"Herbert%20A.%20Giles",

"CHECK_OUT_DATE":"","RESERVED_BY":"","COMMENTS":"","CHECKED_OUT_BY":"","LAST_UPDATE_BY":"","LAST_UPDATE_DATE":"",

"COVER_IMAGE":"","ISBN":"","BLERT":"","TM":"","COLUMN_13":"","COLUMN_14":"","COLUMN_15":"","COLUMN_16":"","COLUMN_17":"",

"COLUMN_18":"","EMAIL_ADDRESS":"","PICTURE":"","DC":"E","ZZ1":"567","LISS":"","JW":"","COLUMN_25":"","COLUMN_26":"",

"COLUMN_27":"","IS_AVAILABLE":"","COLUMN_29":"","DATETIMEWRITTEN":""}

oRec = RTI_JSON( jString, 'Parse')

table = RTI_JSON(oRec, 'GetValue', "rti_table")  ;* should return BOOKS

If table = '' Then

   Return ''

End

id  = RTI_JSON(oRec, 'GetValue', "id") ;* should return 1021
</code>
 

Example 3:

<code>
myGrid = rti_json('','New', 'ARRAY') ;* create a new, empty array object

list = Get_Property(@window:'.GRID', 'LIST') ;* get the elements of a list

cnt = count(list, @fm) + ( list # '' )

k = 0

for i = 1 to cnt  

  item = list<i,1>

  val = list<i,2>

  if item # '' then

     obj = rti_json('','New', 'STRING', val)   ;* create a new string object for each value

     x = rti_json(myGrid, 'SetObject', '[':k:']', obj, 1) ;* store it into the array

     k+=1

  end   

next  

myobj = rti_json('','New', 'OBJECT') ;* create a new empty object

x = rti_json(myobj,'SetObject', 'myGrid', myGrid, 1) ;* put the previously-created grid into the object

JString = rti_json(myobj, "Stringify") ;* return the JSON string
 
</code>