TAILIEUCHUNG - Beginning Ajax with ASP.NET- P6

Beginning Ajax with P6:Thank you for purchasing Beginning Ajax with . We know that you have a lot of options when selecting a programming book and are glad that you have chosen ours. We’re sure you will be pleased with the relevant content and high quality you have come to expect from the Wrox Press line of books. | JavaScript and the Document Object Model This gives the SuperAgent object all the characteristics of the Agent object. From this you can further supplement this behavior by continuing to define properties and methods using the standard prototype syntax. To override any of the behavior of the Agent object simply define properties and or methods of the same name as the inherited objects. Summary of Material So Far Up to this point this chapter has covered some of the basics core concepts and advanced object concepts of JavaScript. You have learned the basic syntax of JavaScript how to define arrays functions event handlers basic flow control operators and basic input output operations and performed a whirlwind tour of object-oriented concepts like constructors and the more advanced concepts like object inheritance via prototype chaining. One of JavaScript s main goals is to allow dynamic manipulation of HTML documents that is to act as the scripting engine for DHTML Dynamic HTML web applications. Now that you have the core concepts of JavaScript and its operation covered you can delve into the world of the Document Object Model and how to manipulate it. The Document Object Model The Document Object Model or DOM is an object that provides access to all the elements within the HTML document or page such as links forms fields anchors and so on. There are however several object models that relate to the DOM as it stands today that warrant some discussion. Earlier in this chapter we briefly discussed the evolution of the DOM by various browser vendors and touched upon the various incompatibilities that have occurred as the object models have evolved over time. This is both a good and a bad thing. On one hand it means that the object models are constantly being reviewed and improved upon with the ultimate goal to reach a level of standardization or commonality among all the major browser vendors. This is one of the major tenets of the W3C which was also mentioned at the .

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