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The DOM specification uses the DOMTimeStamp type, but language bindings may use different types Java, for example, uses the long type, while the ECMAScript binding uses the Date type
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Handling Errors: The DOMException Interface
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One interface that should be introduced right up front is the DOMException interface DOMExceptions are used by DOM implementations to report error conditions that are, interestingly enough, exceptional In other words, the requested operation is impossible to perform for some reason either the implementation program has become unstable, or there is some logical error in the DOM program that prevents it from continuing In other nonexceptional cases, specific error codes are returned by interface methods when an error occurs The DOMException interface is defined in IDL as
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exception DOMException { unsigned short code; };
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The Document Object Model: Processing Structured Documents
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Of course, some languages don t support exceptions For these particular bindings, an interface s methods may return regular error codes that correspond to the DOM exception that would have been raised otherwise For specific information on what exceptions are and how they work, you should consult the documentation for your specific language binding The specific exception codes defined by the DOM are introduced later in this chapter
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The Document Tree Structure
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As briefly alluded to in the first chapter, the DOM represents a document using a tree structure In this section, we take a more in-depth look at the document structure and how the DOM represents the various parts of a document Let s take another look at the example from 1 Recall our example code listing:
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A typical HTML document
<HTML> <HEAD> <TITLE>This is a document</TITLE> </HEAD> <BODY> <B>This is some bold text!</B> <I>This is some italic text!</I> </BODY> </HTML>
For this document, there is a corresponding tree structure that illustrates how the DOM would represent the relationships among the document s elements, as shown in 1 and repeated here in Figure 2-1 In fact, the DOM document tree structure can be thought of as a collection of individual subtrees For example, the branch of the overall tree that begins with the <BODY> tag can be thought of as its own tree within the larger document tree In a sense, a DOM document can thus be thought of as a collection of trees, or a grove The DOM, of course, doesn t define how the information represented by the tree structure shown in Figure 2-1 is actually implemented for a given DOM implementation; it simply says the information needs to be exposed to the outside world in this way
2: How the DOM Represents Structured Documents
Figure 2-1
Document tree diagram
Each box in Figure 2-1 is called a node in DOM terminology A node is an object representation of a particular element in the document s content Nodes have special names, depending on where they are located in the document tree and what their position is relative to other nodes All documents have a root node, which is the node located at the base of the tree structure In Figure 2-1, the root node is the box representing the <HTML> tag If a node has one or more nodes below it, those nodes are referred to as child nodes of the given node, and each of these child nodes is a descendant of its parent node The node represented in the figure by the <HEAD> tag is a child of the <HTML> node, and it in turn, has a child node that represents the <TITLE> tag This parent-child relationship between nodes is used and referred to extensively throughout the DOM API Nodes that have no children of their own are called leaf nodes, and they are the nodes located at the furthest reaches of the tree The text nodes that represent the text content of the <B>, <I>, and <TITLE> tags in the figure are leaf nodes Continuing with the parent-child relationship metaphor, nodes that share the same parent are called sibling nodes In Figure 2-1, the <BODY> and <HEAD> tags are sibling nodes If two nodes descend from the same node somewhere in the tree structure, they are said to have a common ancestor node Figure 2-2 highlights the common ancestor nodes shared by the nodes represented by the <B> and <I> tags, which are the <BODY> and <HTML> tags
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