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The Document Object Model
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What is the DOM In short, the DOM is a way of conceptualizing the contents of a document. In the real world, we all share something that could be called a World Object Model. We can refer to objects in our environment using terms like car, house, and tree, and be fairly certain that our terms will be understood. That s because we have mutually agreed on which objects the words refer to specifically. If you say The car is in the garage, it s safe to assume that the person you re talking to won t take that to mean The bird is in the cupboard. Our World Object Model isn t restricted to tangible objects though; it also applies to concepts. For instance, you might refer to the third house on the left when giving directions. For that description to make sense, the concepts of third and left must be understood. If you give that description to someone who can t count, or who can t tell left from right, then the description is essentially meaningless, whether or not the words have been understood. In reality, because people agree on a conceptual World Object Model, very brief descriptions can be full of meaning. You can be fairly sure that others share your concepts of left and third. It s the same situation with web pages. Early versions of JavaScript offered developers the ability to query and manipulate some of the actual contents of web documents mostly images and forms. Because the terms images and forms had been predefined, JavaScript could be used to address the third image in the document or the form named details, as follows: document.images[2] document.forms['details'] This first, tentative sort of DOM is often referred to as DOM Level 0. In those early, carefree days, the most common usage of DOM Level 0 was for image rollovers and some client-side form validation. But when the fourth generation of browsers from Netscape and Microsoft appeared, the DOM really hit the fan.
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CHAPTER 1 A BRIEF HISTORY OF JAVASCRIPT
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The browser wars
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Netscape Navigator 4 was released in June 1997, and by October of that year, Internet Explorer 4 had also been released. Both browsers promised improvements on previous versions, along with many additions to what could be accomplished with JavaScript, using a greatly expanded DOM. Web designers were encouraged to test-drive the latest buzzword: DHTML.
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The D word: DHTML
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DHTML is short for Dynamic HTML. Not a technology in and of itself, DHTML is a shorthand term for describing the combination of HTML, CSS, and JavaScript. The thinking behind DHTML went like this: You could use HTML to mark up your web page into elements. You could use CSS to style and position those elements. You could use JavaScript to manipulate and change those styles on the fly. Using DHTML, complex animation effects suddenly became possible. Let s say you used HTML to mark up a page element like this: <div id="myelement">This is my element</div> You could then use CSS to apply positioning styles like this: #myelement { position: absolute; left: 50px; top: 100px; } Then, using JavaScript, you could change the left and top styles of myelement to move it around on the page. Well, that was the theory anyway. Unfortunately for developers, the Netscape and Microsoft browsers used different, incompatible DOMs. Although the browser manufacturers were promoting the same ends, they each approached the DOM issue in completely different ways.
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The Netscape DOM made use of proprietary elements called layers. These layers were given unique IDs and then addressed through JavaScript like this: document.layers['myelement'] Meanwhile, the Microsoft DOM would address the same element like this: document.all['myelement'] The differences didn t end there. Let s say you wanted to find out the left position of myelement and assign it to the variable xpos. In Netscape Navigator 4, you would do it like this: var xpos = document.layers['myelement'].left; Here s how you would do the same thing in Internet Explorer 4: var xpos = document.all['myelement'].leftpos;
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