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What is E4X, and what makes it so good Seemingly named after a military missile project, those three characters form a cutesy abbreviation of ECMAScript for XML. It s an ECMA International specification that has been around for a while, but it provides a completely new, simplified way to access data in an ActionScript 3.0 XML instance. What s ECMA The letters stand for European Computer Manufacturers Association, which was formed in 1961. They got together a few years back to devise the ECMAScript Language Specification, which is the basis for JavaScript and ActionScript. They have moved quite beyond their computer roots, and today the organization is officially known as Ecma International.
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In E4X, element nodes are referenced by the name you give them. Paths to nested elements and attributes are easily expressed by a neatly compact syntax of dots (.) and at symbols (@). This syntax closely matches the dot-notation pathing you re familiar with from the Twinkie example in 4. Let s see how it works. If you haven t done so already, open the LoadXML.fla file in this chapter s Exercise folder. Click into frame 1 of the scripts layer, and open the Actions panel to reveal the ActionScript. The trace() function at line 9 is about to illustrate a number of dynamite E4X features. Testing the movie as it stands puts the full XML document s contents into the Output panel, as shown here: <flashbooks> <book title="Flash Applications for Mobile Devices" publisher="friendsofED" pageCount="514"> <authors> <author>Richard Leggett</author> <author>Weyert de Boer</author> <author>Scott Janousek</author> </authors> </book>
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<book title="ActionScript 3.0 Image Effects" publisher="friendsofED" pageCount="663"> <authors> <author>Todd Yard</author> </authors> </book> <book title="ActionScript 3.0 Animation: Making Things Move" publisher="friendsofED" pageCount="542"> <authors> <author>Keith Peters</author> </authors> </book> <book title="Flash Math Creativity" publisher="friendsofED" pageCount="264"> <authors> <author>David Hirmes</author> <author>JD Hooge</author> <author>Ken Jokol</author> <author>Pavel Kaluzhny</author> <author>Ty Lettau</author> <author>Lifaros</author> <author>Jamie MacDonald</author> <author>Gabriel Mulzer</author> <author>Kip Parker</author> <author>Keith Peters</author> <author>Paul Prudence</author> <author>Glen Rhodes</author> <author>Manny Tan</author> <author>Jared Tarbell</author> <author>Brandon Williams</author> </authors> </book> <book title="Foundation ActionScript 3.0" publisher="friendsofED" pageCount="566"> <authors> <author>Steve Webster</author> <author>Todd Yard</author> <author>Sean McSharry</author> </authors> </book> </flashbooks> So far, so good. But if you don t care about the root element, <flashbooks>, and simply want to see the <book> elements, update the trace() line to read trace(xmlDoc.book);. Once you do that, test the movie again. This time, the <flashbooks> tag doesn t show, because you re accessing only its children.
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To view <book> elements individually, use the array access operator, [], and specify the desired element, starting your count with 0: trace(xmlDoc.book[0]); // displays the first <book> element (Flash Applications for Mobile Devices) // and its children trace(xmlDoc.book[1]); // displays the second <book> element (ActionScript 3.0 Image Effects) // and its children Now, what about attributes To see those, just precede an attribute s name with the @ symbol as part of your dot-notation path reference. For example, if you want to see the title attribute of the first <book> element, type the following: trace(xmlDoc.book[0].@title); To see the second <book> element s title, substitute 0 with 1; to see the third, substitute 1 with 2; and so on. Based on this pattern, the last element s title attribute would be xmlDoc.book[4].@title. But we know to use the number 4 only because we re aware how many <book> elements there are. What if we didn t know In that case, it helps to understand exactly what you re getting back from these E4X results. What you re getting are instances of the XMLList class, and that means you can invoke any of the methods that class provides on these expressions. For example, you ve already seen that the expression xmlDoc.book returns a list of all the <book> elements. That list is a bona fide XMLList instance. So, by appending an XMLList method say, length() to the expression, you get something useful (in this case, the length of the list, which is 5). We know that in this context counting starts with zero, so to see the title attribute of the last <book> element, put the following somewhat complex expression inside the array access operator ([]): trace(xmlDoc.book[xmlDoc.book.length() - 1].@title); It may look a little scary, but it isn t when you reduce it to its parts. The expression xmlDoc.book.length() - 1 evaluates to the number 4. To see the title attribute of all <book> elements, drop the array access operator altogether: trace(xmlDoc.book.@title); In the Output panel, you ll see that the combined results run together, as shown in Figure 12-1. This is because these attributes don t have any innate formatting. They aren t elements in a nested hierarchy; they are just individual strings.
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Figure 12-1. Unless they have their own line breaks, attributes will run together. In this situation, another XMLList method can help you. To make each title appear on its own line, append toXMLString() to the existing expression: trace(xmlDoc.book.@title.toXMLString()); Swap title for the pageCount attribute, as follows: trace(xmlDoc.book.@pageCount.toXMLString()); As shown in Figure 12-2, you ll see page counts for each book instead of titles in the Output panel.
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Figure 12-2. Any element s attributes can be retrieved. What about looking at a list of the authors Viewing individual authors is just as easy. Update the trace() function to look like this: trace(xmlDoc.book[0].authors .author [1]); This trace() function instructs Flash to look at the first <book> element s <authors> element and then pull out that node s second <author> element, which happens to be Weyert De Boer. For fun and to see how easy E4X makes things for you, contrast the preceding intuitive reference with its ActionScript 2.0 equivalent: xmlDoc.firstChild.firstChild.firstChild.childNodes[1]. Which would you rather use Moving back to the kinder, gentler world of ActionScript 3.0, update the trace() function as follows to see the whole 15-member cast of the fourth book: trace(xmlDoc.book[3].authors .author);
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This time, you get elements again, complete with their tag markup, as shown in Figure 12-3. This is just like tracing xmlDoc.book earlier, where the Output panel showed <book> elements and their descendants.
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