how to create barcode in vb net 2012 11: Future Directions for the DOM in Java

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11: Future Directions for the DOM
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However, if you were to use the change all function, in which the program automatically searches the entire document and replaces all of the matches that it finds, each one of those changes would no longer be considered one individual change If you were to use the undo command after a change all operation, all of the individual changes that were made to the document s content would be undone all at once In this case, all of the singular changes would be grouped together into one transaction Another benefit of transactions is that they lock out other changes while the underlying data is being modified If an application allows concurrent processes access to a shared piece of data, such as a document, and each of those processes tries to modify the document at the same time, the results can quickly become chaotic unless some type of control mechanism is employed Transactions can prevent this from happening by ensuring that only one pending transaction can be active at any one time
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The Level 3 DOM does not yet address transactions, although it is an idea that might find its way into future versions of the specification
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Though it is beyond the scope of this section to provide an in-depth discussion of how transactions work and all their nuances, it is worth a brief exploration to see how transactions might be applied in the DOM
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Wrapping a Series of Edits as a Transaction
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To create a single transaction, it is necessary to indicate the beginning and end of the range of edits that will comprise the transaction This can be done in several ways, but one way is to use explicit function calls to wrap each transaction The following JavaScript pseudocode illustrates one example of what this might look like:
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DOMImplementation impl = documentimplementation; DOMTransaction tID = implbeginTransaction(); // perform some edits to the document var text = documentcreateTextNode("Some Text"); documentdocumentElementappendChild(text); // end the transaction implendTransaction(tID);
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This code explicitly wraps the beginning and ending of a transaction with calls to two made-up functions called beginTransaction() and endTransaction()
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The Document Object Model: Processing Structured Documents
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The beginTransaction() call also returns an identifier token that can be used to identify the transaction In addition, it may be useful for an application to be able to discover whether a transaction is currently taking place This can be accomplished by calling a method like isInsideTransaction(), which would return the identifier of the current transaction ID or 1 if no transaction is underway:
var tID = implisInsideTransaction();
Rolling Back a Transaction
One of the nice things about transactions is that once completed, they can be recorded and rolled back, or undone on an individual basis For example, an application may keep a list of completed transactions on a document and expose this to the user when implementing a multiple undo feature, or a history-like list of past operations that show all of the operations on a document To roll a transaction back, the developer might use a function like rollBackTransaction(), which returns true if the transaction was able to be rolled back:
var bResult = rollBackTransaction(tID);
Conclusion
In this chapter, we examined the changes proposed in the latest working drafts of the DOM Level 3 modules and investigated some other trends and technologies that are affecting the development of the DOM, though they are not yet part of the official standard We started off by examining the latest proposed changes in DOM Level 3, beginning with the additions and changes to the existing interfaces We looked at the new data types and methods added to the DOM to support such concepts as testing nodes for sameness and equality, extracting text content from nodes, attaching application-specific data to document nodes, and determining the positions of nodes in the document tree relative to other nodes Next, we investigated some entirely new interfaces proposed for the latest specification to support document loading and saving, error handling, working with and editing DTDs and other abstract schemas, and working with XPath expressions all very useful functionality that has been noticeably absent from prior DOM levels
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