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JSON and A Comparison of Scripts

JSON and A Comparison of Scripts. JSON: JavaScript Object Notation. Based on a subset of the JavaScript Programming Language provides a standardized data exchange format that is better-suited for Ajax-style web applications.

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JSON and A Comparison of Scripts

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  1. JSONandA Comparison of Scripts

  2. JSON: JavaScript Object Notation • Based on a subset of the JavaScript Programming Language • provides a standardized data exchange format that is better-suited for Ajax-style web applications. formal languages specifically designed to support the communication of data and metadata.

  3. JSON: JavaScript Object Notation • Language independant, but similar to C-family (C, Java, Perl, Python) • Data formatted according to the JSON standard is lightweight and can be parsed by JavaScript implementations with incredible ease

  4. JSON: JavaScript Object Notation • Built on two structures: • Name/value pair • Ordered list of values

  5. JSON literals

  6. JSON: the difference • JSON: much stricter rules. • name of an object member must be a valid JSON string. • string must be enclosed in quotation marks. • array and object elements are limited to a set. • No date/time literal (not in JavaScript either) • No comments

  7. Using JSON • Use a script tag <script src="http://www.mysite.com/mydata.js"></script> • Dynamically load a script tag function dhtmlLoadScript(url) { var e = document.createElement("script"); e.src = url; e.type="text/javascript"; document.getElementsByTagName("head")[0].appendChild(e); } dhtmlLoadScript("http://www.mysite.com/mydata.js");

  8. Using JSON • Use AJAX to pull some text from the server and then eval it. ajaxCaller.getPlainText("mydata.js", function(jsText) { eval(jsText); });

  9. Server vs Client Side Scripting

  10. Client-side Scripting • Easy way to provide additional functionality and flexibility • Downloaded, interpreted and executed by the browser • Dependant on the client's capabilities (memory, CPU speed, video card) • Lightweight, less full-featured language • Examples: JavaScript, JScript, VBScript

  11. Server-side Scripting • Also enhances functionality, but usually less visible • Used for content management (database) • Runs on the server and depends on memory and CPU speed of the server • Must be supported by the server • Examples: PHP, ASP, Perl

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