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Handling XML in Ajax
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Here s what such a document might look like in XML note that you re storing information about three friends here:
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< xml version="10" > <friends> <friend> <first_name>Cary</first_name> <last_name>Grant</last_name> </friend> <friend> <first_name>Myrna</first_name> <last_name>Loy</last_name> </friend> <friend> <first_name>James</first_name> <last_name>Stewart</last_name> </friend> </friends>
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You re free to use your own element names in XML, as long as they are legal element names syntactically There are two sides to that coin: while browsers can be programmed to understand HTML elements and display your HTML document accordingly, you have to take extra steps with XML That is, XML documents are all about storing data, not presenting that data visually (like HTML), and that means you have to provide a way of extracting that data and working with it yourself That s where JavaScript is going to come into play in this chapter you re going to see how to use JavaScript to read and navigate through XML documents in this chapter Using your own programming (a step not necessary with HTML), you can extract the data in an XML document and make use of that data There are some XML rules here that you should know about, and we ll take a look at them now We ll start by constructing an XML document from scratch that will document the people present at a party in this case, a party given on the occasion of a snow day, when school has been cancelled First, you must start all XML documents with an XML declaration, which looks like this:
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< xml version="10" >
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This is an XML declaration, not an XML element, and it must be the first line in your XML document The version attribute is required, and you can set it to "10" (the most common version, and the version we ll use) or "11" Besides the version attribute, you can also include the standalone attribute (set to "no" if this document includes other XML documents in it, "yes" otherwise) and the encoding attribute (set to the character encoding you re using you can, for example, specify that you re using Japanese characters, or Russian characters) The default for
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the encoding is the UTF-8 character set, which is what WordPad and other standard editors use (actually, they use a subset of UTF-8):
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< xml version="10" standalone="yes" encoding="UTF-8" >
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Next up in an XML document are the elements that contain the data in the document You make up your own tag names in XML, but there are some rules about what tag names are legal Tag names can t start with a number, can t contain spaces, and can t contain a few other illegal characters, such as quotation marks or spaces Here are some illegal tag names:
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<12steps> <big dog> <"ok">
The first element in a document is the document element In XML documents, one element encloses all the other elements, and that element is called the document element In the case of our snow-day party example, we might call the document element <parties> so that we can keep track of a number of parties:
< xml version="10" > <parties> </parties>
Every other element in the XML document must be contained within this document element, so, for example, if you want to keep track of the attendees at three different parties, you can have three <party> elements enclosed inside the <parties> element:
< xml version="10" > <parties> <party> </party> <party> </party> <party> </party> </parties>
6:
Handling XML in Ajax
So you see that, just like HTML, XML elements can contain other XML elements In fact, you can also have empty elements, just as you can in HTML (the <img> element is an example of an empty element in HTML) Empty elements have no content: no nested elements, no nested text In XML, you end an empty element with the markup />, so, for example, if you have empty elements named <afternoon /> and <evening />, you can indicate when a party took place by using these elements:
< xml version="10" > <parties> <party> <afternoon /> </party> <party> <evening /> </party> <party> <afternoon /> </party> </parties>
XML elements can also include attributes, just as HTML elements can Attributes can appear in the opening tags of elements, or inside empty elements, and they re name/value pairs For example, say that you want to give the <party> element a type attribute, indicating that the party is a winter party; you can do that like this:
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