126 lines
6.5 KiB
Text
126 lines
6.5 KiB
Text
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dojox.jsonPath
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-------------------------------------------------------------------------------
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Version 1.0
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Release date: 11/14/2007
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-------------------------------------------------------------------------------
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Project state: beta
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-------------------------------------------------------------------------------
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Project authors
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Dustin Machi
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Kris Zyp
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-------------------------------------------------------------------------------
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Project description
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jsonPath is a query system similar in idea to xpath, but for use against
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javascript objects. This code is a port of the jsonPath code at
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http://code.google.com/p/jsonpath/. It was contributed under CLA by Stefan
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Goessner. Thanks Stefan!
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-------------------------------------------------------------------------------
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Dependencies:
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Dojo Core (package loader).
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-------------------------------------------------------------------------------
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Documentation
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Usage:
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var matches = dojox.jsonPath.query(objectToQuery, jsonPathExpresson)
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Expressions:
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$ The Root Object
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@ The current object/element
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. or [] The child operator
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.. Recursive descent
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* all objects
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[] subscript operator
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[,] Union operator
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[start:end:step] array slice operator
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?() applies a filter/script expression
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() script expresions
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some examples:
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Given the following test data set:
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var json =
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{ "store": {
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"book": [
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{ "category": "reference",
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"author": "Nigel Rees",
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"title": "Sayings of the Century",
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"price": 8.95
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},
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{ "category": "fiction",
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"author": "Evelyn Waugh",
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"title": "Sword of Honour",
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"price": 12.99
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},
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{ "category": "fiction",
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"author": "Herman Melville",
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"title": "Moby Dick",
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"isbn": "0-553-21311-3",
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"price": 8.99
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},
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{ "category": "fiction",
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"author": "J. R. R. Tolkien",
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"title": "The Lord of the Rings",
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"isbn": "0-395-19395-8",
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"price": 22.99
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}
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],
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"bicycle": {
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"color": "red",
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"price": 19.95
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}
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}
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};
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Here are some example queries and their output:
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$.store.book[*].author
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["Nigel Rees","Evelyn Waugh","Herman Melville","J. R. R. Tolkien"]
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$..author
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["Nigel Rees","Evelyn Waugh","Herman Melville","J. R. R. Tolkien"]
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$.store.*
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[[{"category":"reference","author":"Nigel Rees","title":"Sayings of the Century","price":8.95},{"category":"fiction","author":"Evelyn Waugh","title":"Sword of Honour","price":12.99},{"category":"fiction","author":"Herman Melville","title":"Moby Dick","isbn":"0-553-21311-3","price":8.99},{"category":"fiction","author":"J. R. R. Tolkien","title":"The Lord of the Rings","isbn":"0-395-19395-8","price":22.99}],{"color":"red","price":19.95}]
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$.store..price
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[8.95,12.99,8.99,22.99,19.95]
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$..book[(@.length-1)]
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[{"category":"fiction","author":"J. R. R. Tolkien","title":"The Lord of the Rings","isbn":"0-395-19395-8","price":22.99}]
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$..book[-1]
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[{"category":"fiction","author":"J. R. R. Tolkien","title":"The Lord of the Rings","isbn":"0-395-19395-8","price":22.99}]
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$..book[0,1]
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[{"category":"reference","author":"Nigel Rees","title":"Sayings of the Century","price":8.95},{"category":"fiction","author":"Evelyn Waugh","title":"Sword of Honour","price":12.99}]
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$..book[:2]
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[{"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}]
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$..book[?(@.isbn)]
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[{"category":"fiction","author":"Herman Melville","title":"Moby Dick","isbn":"0-553-21311-3","price":8.99},{"category":"fiction","author":"J. R. R. Tolkien","title":"The Lord of the Rings","isbn":"0-395-19395-8","price":22.99}]
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$..book[?(@.price<10)]
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[{"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}]
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$..*
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[{"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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-------------------------------------------------------------------------------
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Installation instructions
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Grab the following from the Dojo SVN Repository:
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http://svn.dojotoolkit.org/var/src/dojo/dojox/trunk/jsonPath
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Install into the following directory structure:
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/dojox/jsonPath/
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...which should be at the same level as your Dojo checkout.
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