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JSON

JSON. By Marcus Lopes. Summary. What is JSON? JSON vs XML Using JSON JSON + AJAX JSON + JQuery. What is JSON?. Javascript Object Notation  RFC 4627  Lightweight alternative to XML Built-in to Javascript. JSON Structure. Object

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JSON

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  1. JSON By Marcus Lopes

  2. Summary • What is JSON? • JSON vs XML • Using JSON • JSON + AJAX • JSON + JQuery

  3. What is JSON? • Javascript Object Notation  • RFC 4627  • Lightweight alternative to XML • Built-in to Javascript

  4. JSON Structure • Object Pair of curly brackets containing zero or more name/value pairs.E.g.:{ "customer":     {       "name":"Marcus",       "favoriteFood":"Burgers",       "age": 21     }  } To find out the name for this customer, you would write: customer.name

  5. JSON Structure • Arrays  Represented as square brackets and values are separated by comas. May contain 0 or more values.E.g.: {"customer":    {      "name":"Marcus",      "favoriteFood":[        "Burgers","Fries","Bacon"],      "age": 21    } } customer.favoriteFood[2] would return Bacon

  6. JSON Structure • Numbers Similar to most programming languages E.g.: {"customer":    {      "name":"Marcus",      "numbers":[23, 2, 1.35],      "age": 21    } } To find the age, you can type customer.age

  7. JSON Structure • Strings  Work similar to the C family of programming languages A string begins and ends with quotation marks. E.g.: {"customer":    {      "name":"Marcus",      "language":"Portuguese"    } } To find out the language, you can type customer.language

  8. Objects JSON objects can contain nested objects and functions:     {"customer":        {          "myFunction":function (){alert("Hello world!");},          "numbers":[23, 2, 1.35],          "age": 21        }     } To call the method myFunction, you can type customer.myFunction(); JSON Structure

  9. JSON Structure • Parsing The default encoding for JSON is UTF-8 • According to its documentation, JSON shall be encoded in Unicode. •  In order to read JSON from an AJAX request, we must evaluate the JSON code using the eval() function. • Parenthesis must surround the code to be evaluated to avoid confusion between a code block and an object E.g.: eval("({price:20})")

  10. Links Response: HTML, XML or JSON http://www.quirksmode.org/blog/archives/2005/12/the_ajax_respon.html JSON documentation http://www.json.org/ PHP json_encode documentation http://php.net/manual/en/function.json-encode.php

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