MACROMEDIA FLASH REMOTING MX-USING FLASH REMOTING FOR FLASH MX 2004 ACTIONSCRIPT 2.0 Spezifikationen PDF herunterladen (Seite 16)

This is the Title of the Book, eMatter Edition

Chapter 1: Introduction to Flash Remoting

This example queries a database and outputs the results as a table in the browser.

This type of mixture of HTML and server-side code is commonplace in web applica-

tion development. Notice, however, that the presentation of the content is created

entirely by the application server. The HTML table doesn’t exist until the query is

executed and the results are sent to the browser.

Using Flash Remoting, the application server code is utilized for the logic only—que-

rying the database. The results of the query are returned to the Flash movie without

any further parsing or manipulating. Using Flash Remoting, a ColdFusion compo-

nent could be written as follows:

SELECT Title, Category, Pub_No FROM Books

WHERE Title LIKE '%#form.searchfield#%'

</cfquery>

</cffunction>

</cfcomponent>

Notice the line in bold, <cfreturn rsGetSearchResults />, which returns the entire

recordset to the Flash movie as an ActionScript RecordSet object. The Flash movie, in

turn, can use the recordset without any further parsing. For example, to attach the

recordset to a DataGrid component in Flash, you can simply use this result handler

in ActionScript:

function rsGetSearchResults_Result (result_rs) {

myGridComponent.setDataProvider(result_rs);

}

Again, the Flash movie is working with the recordset as it comes from the server. No

further parsing is necessary. Also, the ActionScript programmer has at his disposal a

series of highly complex and interactive interface elements, unlike HTML forms,

which are limited in functionality.

Another advantage is that the Flash movie looks the same in all browsers. The

HTML language is ubiquitous, but the implementation is not uniform. Typically,

you have to rely on CSS implementation, JavaScript being enabled, and/or cookies

being enabled, or you have to create even more client-side code to handle the many

possible user configurations.

Session Management in Flash

HTTP is a stateless protocol. The web server treats each page request coming from a

browser as coming from an entirely new user. To create the illusion of maintaining

state, many application servers have state management (or session management)in

place to create a seamless experience for the end user. Session management is a bit of

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MACROMEDIA FLASH REMOTING MX-USING FLASH REMOTING FOR FLASH MX 2004 ACTIONSCRIPT 2.0 Spezifikationen Seite 16