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. The flow and conversion of data between a Flash movie, a server-side script, and a database The password validation for the brokerage system requires two scripts: a function defined on Frame 1, and a script that creates and sends the XML objects attached to the Submit button in the form. When users enter their information into text fields in the SWF file with the variables username and password, the variables must be converted to XML before being passed to the server. The first section of the script loads the variables into a newly created XML object called loginXML. When a user clicks the Submit button, the loginXML object is converted to a string of XML and sent to the server. The following script is attached to the Submit button. To understand this script, read the commented lines (indicated by the characters //): on (release) { // A. Construct an XML document with a LOGIN element loginXML = new XML(); loginElement = loginXML.createElement(”LOGIN”); loginElement.attributes.username = username; loginElement.attributes.password = password; loginXML.appendChild(loginElement); // B. Construct an XML object to hold the server’s reply loginReplyXML = new XML(); loginReplyXML.onLoad = onLoginReply; // C. Send the LOGIN element to the server, // place the reply in loginReplyXML loginXML.sendAndLoad(”https://www.imexstocks.com/main.cgi”, loginReplyXML); } The first section of the script generates the following XML when the user clicks the Submit button: 182 Chapter 10: Working with External Data
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The server-side script that passes information between Flash and the database reads and writes the data in XML format. You can use ActionScript to convert information collected in the SWF file (for example, a user name and password) to an XML object and then send the data to the server- side script as an XML document. You can also use ActionScript to load the XML document that the server returns into an XML object to be used in the SWF file.
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About XML XML (Extensible Markup Language) is becoming the standard for the interchange of structured data in Internet applications. You can integrate data in Flash with servers that use XML technology to build sophisticated applications, such as chat systems or brokerage systems. In XML, as with HTML, you use tags to mark up, or specify, a body of text. In HTML, you use predefined tags to indicate how text should appear in a web browser (for example, the tag indicates that text should be bold). In XML, you define tags that identify the type of a piece of data (for example,
VerySecret). XML separates the structure of the information from the way it s displayed, so the same XML document can be used and reused in different environments. Every XML tag is called a node, or an element. Each node has a type (1, which indicates an XML element, or 3, which indicates a text node), and elements may also have attributes. A node nested in a node is called a child node. This hierarchical tree structure of nodes is called the XML Document Object Model (DOM) much like the JavaScript DOM, which is the structure of elements in a web browser. In the following example, is the parent node; it has no attributes and contains the child node , which has the attributes SYMBOL, QTY, PRICE, and VALUE: Using the XML class The methods of the ActionScript XML class (for example, appendChild(), removeNode(), and insertBefore()) let you structure XML data in Flash to send to a server and manipulate and interpret downloaded XML data. The following XML class methods send and load XML data to a server by using the HTTP POSTmethod: The load() method downloads XML from a URL and places it in an ActionScript XML object. The send() method passes an XML object to a URL. Any returned information is sent to another browser window. The sendAndLoad() method sends an XML object to a URL. Any returned information is placed in an ActionScript XML object. For example, you could create a brokerage system that stores all its information (user names, passwords, session IDs, portfolio holdings, and transaction information) in a database. Sending and loading variables to and from a remote source 181
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