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Sending and loading variables to and from a remote source 283

You can test this code by using a user name of JeanSmith and the password VerySecret. The

first section of the script generates the following XML when the user clicks the login button:

The server receives the XML, generates an XML response and sends it back to the SWF file. If the

password is accepted, the server responds with the following:

This XML includes a session attribute that contains a unique, randomly generated session ID,

which will be used in all communications between the client and server for the rest of the session.

If the password is rejected, the server responds with the following message:

The loginreply XML node must load into a blank XML object in the SWF file. The following

statement creates the XML object

loginreplyXML to receive the XML node:

// Construct an XML object to hold the server's reply

var loginReplyXML:XML = new XML();

loginReplyXML.onLoad = function(success:Boolean) {

The second statement in this ActionScript defines an anonymous (inline) function, which is

called when the

onLoad event triggers.

The login button (

login_btn instance) is used to send the user name and password as XML to

the server and to load an XML response back into the SWF file. You can use the

sendAndLoad()

method to do this, as shown in the following example:

loginXML.sendAndLoad("http://www.flash-mx.com.com/mm/main.cfm",

loginReplyXML);

First, the XML-formatted data is created, using the values that the user inputs in the SWF file,

and that XML object is sent using the

sendAndLoad method. Similar to data from a

loadVariables() function, the loginreply XML element arrives asynchronously (that is, it

doesn’t wait for results before being returned) and loads into the

loginReplyXML object. When

the data arrives, the

onLoad handler of the loginReplyXML object is called. You must define the

loginReplyXML function, which is called when the onLoad handler triggers, so it can process the

loginreply element.

Note: This function must always be on the frame that contains the ActionScript for the login button.

If the login is successful, the SWF file progresses to the welcome frame label. If the login is not

successful, then the playhead moves to the

loginfailure frame label. This is processed using a

condition and case statement. For more information on case and break statements, see

case and

break in Flash ActionScript Language Reference. For more information on conditions, see if and

else in Flash ActionScript Language Reference.

Note: This design is only an example, and Macromedia can make no claims about the level of security

it provides. If you are implementing a secure password-protected system, make sure you have a good

understanding of network security.

For more information, see Integrating XML and Flash in a Web Application at

www.macromedia.com/support/flash/interactivity/xml/ and the “XML class” entry in Flash

ActionScript Language Reference.