E4x load xml file

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These cookies track visitors across websites and collect information to provide customized ads. Others Others. Add a comment. Active Oldest Votes. Thanks worked like a charm. I guess the only issue was that i was not giving var grid a type.

Funny though the tutorial i was looking at did not give one either. But whatever works! MAC - I've found that a lot of online tutorials and examples for flex seem to be written without being tested. They often leave out types, "var" keyword, and even call a function different than the name of the function in their own example.

What I'm trying to say is take them with a grain of salt. Those tutorials have the right idea as far as technique to follow, but can really mess you up with bad syntax — invertedSpear.

What about parsing and serializing? To do JSON securely, you have to use a safe implementation method, which is considerably slower than the equivalent E4X parser, while the E4X parser does not cannot in fact automatically expose potentially dangerous imperative code.

In the simplest case, the parsing is handled behind the scenes:. In this particular case, the XML is entered "as is" directly into the JavaScript code, and is then consequently interpreted as an E4X object by the system.

This mechanism is similar to the implicit way that strings, arrays, and objects are created using their own internal notation:. As with arrays and objects, an E4X object can extend for more than one line; its "terminator" is the closing bracket of the root node.

Of course, because XML can preserve white space, the use of line feeds and the like should respect the white space argument of the XML itself. Similarly, an E4X object can be created using the new XML constructor, just as you would expect of arrays and objects. The constructor can take either a string or an E4X object as an argument; the first will be parsed as XML if it's well formed , the second will be passed through unchanged. It should be noted here that, unlike the use of eval for JSON evaluation, the new XML constructor is code safe; it won't evaluate JavaScript functions that may be embedded within the string, even if they are bracketed.

In the case of attributes, the bracketed expression should not be quoted, as this suppresses the evaluation within the brackets. This approach is useful for creating quick and dirty XML objects with data coming from the containing JavaScript. If parsing is simple with E4X, serialization is even simpler. The toString method works a litle differently for E4X objects than it does for other JavaScript objects.

Instead of returning the XML representation, it returns the concatenated text of all of the text nodes in the E4X object. This method is implicitly called if the context of the JavaScript up to the point of evaluating the E4X object is a string.

This can be made more obvious in the following:. Note that while the string and number representations acted as if the content was a string, when the data variable holding the E4X object was evaluated, it was evaluated as an XML block.

Remember also that functions like print automatically call the toString method on their contents before outputing the results. For instance, consider an expanded phone book:. However, phoneBook. You can get the actual count with the length function:. You can also reference each element of an XML List individually using zero-based array notation:. This similarity between E4X objects, arrays, and traditional Object objects can also be seen in the use of hashed names; you can reference both XML and XMLList objects using [" name "] where name is the name of the element being requested.

Thus, the previous statement could also be written as:. One of the coolest aspects of E4X is the power exposed by assignments. Indeed, you can use assignment to quickly build XML structures from scratch, change values on the fly and add and remove new content quickly. The XML file itself may only take a few milliseconds to load but trying to access any properties or functions that involve the information being loaded before the information is fully available will more often than not cause errors of doom, so make sure that you add the listener and wait for the load to complete.

Finally, with all the data loaded we put the XML data returned into the xml variable defined on line 20 and the children of the XML xml. After that, the information can then be accessed from inside those two variables as the trace statements at the end of the loaded function prove. There is a list tag, inside of which are a few item tags including an 'id' attribute. Each item tag holds a head and url tag. So how do we access this information specifically. The answer is simple. We use E4X. For example, if we wanted to access the 'id' attribute from the xml variable, we would use the following syntax.