analytics/webcontent/dojo17/dojox/jsonPath/README

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dojox.jsonPath
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Version 1.0
Release date: 11/14/2007
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Project state: beta
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Project authors
	Dustin Machi
	Kris Zyp
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Project description

jsonPath is a query system similar in idea to xpath, but for use against
javascript objects.  This code is a port of the jsonPath code at 
http://code.google.com/p/jsonpath/.  It was contributed under CLA by Stefan
Goessner.  Thanks Stefan! 

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Dependencies:

Dojo Core (package loader).
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Documentation

Usage:

var matches = dojox.jsonPath.query(objectToQuery, jsonPathExpresson)

Expressions:

	$			The Root Object
	@			The current object/element
	. or []			The child operator
	..			Recursive descent
	*			all objects
	[]			subscript operator
	[,]			Union operator
	[start:end:step]	array slice operator
	?()			applies a filter/script expression
	()			script expresions

	some examples:

	Given the following test data set:

	var json = 
                  { "store": {
                        "book": [ 
                          { "category": "reference",
                                "author": "Nigel Rees",
                                "title": "Sayings of the Century",
                                "price": 8.95
                          },
                          { "category": "fiction",
                                "author": "Evelyn Waugh",
                                "title": "Sword of Honour",
                                "price": 12.99
                          },
                          { "category": "fiction",
                                "author": "Herman Melville",
                                "title": "Moby Dick",
                                "isbn": "0-553-21311-3",
                                "price": 8.99
                          },
                          { "category": "fiction",
                                "author": "J. R. R. Tolkien",
                                "title": "The Lord of the Rings",
                                "isbn": "0-395-19395-8",
                                "price": 22.99
                          }
                        ],
                        "bicycle": {
                          "color": "red",
                          "price": 19.95
                        }
                  }
                };

	Here are some example queries and their output:

   	$.store.book[*].author 
	["Nigel Rees","Evelyn Waugh","Herman Melville","J. R. R. Tolkien"]

	$..author
	["Nigel Rees","Evelyn Waugh","Herman Melville","J. R. R. Tolkien"]

	$.store.*
	[[{"category":"reference","author":"Nigel Rees","title":"Sayings of the Century","price":8.95},{"category":"fiction","author":"Evelyn Waugh","title":"Sword of Honour","price":12.99},{"category":"fiction","author":"Herman Melville","title":"Moby Dick","isbn":"0-553-21311-3","price":8.99},{"category":"fiction","author":"J. R. R. Tolkien","title":"The Lord of the Rings","isbn":"0-395-19395-8","price":22.99}],{"color":"red","price":19.95}]

	$.store..price
	[8.95,12.99,8.99,22.99,19.95]

	$..book[(@.length-1)]
	[{"category":"fiction","author":"J. R. R. Tolkien","title":"The Lord of the Rings","isbn":"0-395-19395-8","price":22.99}]

	$..book[-1]
	[{"category":"fiction","author":"J. R. R. Tolkien","title":"The Lord of the Rings","isbn":"0-395-19395-8","price":22.99}]

	$..book[0,1]
	[{"category":"reference","author":"Nigel Rees","title":"Sayings of the Century","price":8.95},{"category":"fiction","author":"Evelyn Waugh","title":"Sword of Honour","price":12.99}]
	
	$..book[:2]
	[{"category":"reference","author":"Nigel Rees","title":"Sayings of the Century","price":8.95},{"category":"fiction","author":"Evelyn Waugh","title":"Sword of Honour","price":12.99}]

	$..book[?(@.isbn)]
	[{"category":"fiction","author":"Herman Melville","title":"Moby Dick","isbn":"0-553-21311-3","price":8.99},{"category":"fiction","author":"J. R. R. Tolkien","title":"The Lord of the Rings","isbn":"0-395-19395-8","price":22.99}]

	$..book[?(@.price<10)]
	[{"category":"reference","author":"Nigel Rees","title":"Sayings of the Century","price":8.95},{"category":"fiction","author":"Herman Melville","title":"Moby Dick","isbn":"0-553-21311-3","price":8.99}]

	$..*
	[{"book":[{"category":"reference","author":"Nigel Rees","title":"Sayings of the Century","price":8.95},{"category":"fiction","author":"Evelyn Waugh","title":"Sword of Honour","price":12.99},{"category":"fiction","author":"Herman Melville","title":"Moby Dick","isbn":"0-553-21311-3","price":8.99},{"category":"fiction","author":"J. R. R. Tolkien","title":"The Lord of the Rings","isbn":"0-395-19395-8","price":22.99}],"bicycle":{"color":"red","price":19.95}},[{"category":"reference","author":"Nigel Rees","title":"Sayings of the Century","price":8.95},{"category":"fiction","author":"Evelyn Waugh","title":"Sword of Honour","price":12.99},{"category":"fiction","author":"Herman Melville","title":"Moby Dick","isbn":"0-553-21311-3","price":8.99},{"category":"fiction","author":"J. R. R. Tolkien","title":"The Lord of the Rings","isbn":"0-395-19395-8","price":22.99}],{"color":"red","price":19.95},{"category":"reference","author":"Nigel Rees","title":"Sayings of the Century","price":8.95},{"category":"fiction","author":"Evelyn Waugh","title":"Sword of Honour","price":12.99},{"category":"fiction","author":"Herman Melville","title":"Moby Dick","isbn":"0-553-21311-3","price":8.99},{"category":"fiction","author":"J. R. R. Tolkien","title":"The Lord of the Rings","isbn":"0-395-19395-8","price":22.99},"reference","Nigel Rees","Sayings of the Century",8.95,"fiction","Evelyn Waugh","Sword of Honour",12.99,"fiction","Herman Melville","Moby Dick","0-553-21311-3",8.99,"fiction","J. R. R. Tolkien","The Lord of the Rings","0-395-19395-8",22.99,"red",19.95]


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Installation instructions

Grab the following from the Dojo SVN Repository:
http://svn.dojotoolkit.org/var/src/dojo/dojox/trunk/jsonPath

Install into the following directory structure:
/dojox/jsonPath/

...which should be at the same level as your Dojo checkout.