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Part II: Server Side, JavaScript, and Flash: Oh My!
Figure 14-4
The weakest part of the current implementation is probably the parseRules() function that is
responsible for transforming a string containing the validation rules into some variables. When you use
a more sophisticated parsing logic, maybe some regular expressions, it is possible to implement a
solution that permits the inclusion of separator characters (like spaces, commas, and parentheses) inside
the string parameters without breaking the parsing rule. The current implementation has been chosen to
favor the code readability and shortness.
What Is AJAX ?
AJAX is a technique that implements communication between an HTML page and a host server without
the need for refreshing the whole page. The technique is advantageous because the size of the exchanged
data is smaller than a whole page and the user interface is more responsive. The name Asynchronous
JavaScript and XML is derived from the technical implementation of this technique using the
XMLHttpRequest (XHR) object.


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