The Document Object Model: Processing Structured Documents in Java

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The Document Object Model: Processing Structured Documents
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oSelectedNode = targetNode; } } } documentgetElementById("List1")addEventListener("click",listListener,true); </SCRIPT> </BODY> </HTML>
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In this example, there is one unordered list (ID List1 ) One capture-style event listener is registered on the list itself If you view this example in Netscape 6x and click the list items, you ll notice that each one you click turns bold and red If one was already red, it turns back to normal and black, and the new one turns bold and red The secret to this behavior is that the single event listener is handling click events for all of the list s child nodes because, as a capture-style listener, the parent <UL> node is getting first crack at the event This is why the handler is registered on the list and not the individual items The handler determines which node was clicked and whether it was the text node for the list item or the list item itself, and it handles highlighting the item by changing its associated style Note that if you add new list items to the list, even programmatically using the DOM, they will all inherit the same behavior from the event listener on the list Using capture-style event listeners is a very powerful way of assigning the same behavior to a node s group of child nodes With this technique, the child nodes can all be made to exhibit the same behavior without having to attach event listeners to each one
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How Event Listeners Interact with Old-Style Listeners
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Prior to the DOM Level 2 Events specification, event listeners were registered using attributes on the intended event target Because all of the current browsers still allow this technique to provide backward compatibility, there has to be a way for the two to coexist According to the DOM Level 2 Events specification, DOM implementations can view the setting of an event handler attribute on an element as analogous to creating and registering an event listener on that element, with the useCapture argument defaulting to false In other words,
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someElementonmouseover = myEventFunction;
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is the same as
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someElementaddEventListener("mouseover", myEventFunction, false);
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5: Browsers
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If an existing event handler attribute is changed, it is analogous to removing the old event listener and attaching a new event listener When using event handler attributes, there is no way for an event listener that has been registered via an attribute on an element to obtain event-related context information, such as the current target or event phase
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Internet Explorer Specific Methods and Properties
Unlike Netscape, Internet Explorer adds dozens of proprietary properties and methods to its version of the DOM API that are not specified by the W3C In this section, we review some of the more important and interesting methods and properties and demonstrate their usage A word to the wise here: using nonstandard properties and methods will make your code less portable, so you should use them only when you are sure that users of your application will be using a particular browser or when there is no other way to accomplish a particular programming task In general, it is usually preferable to stick to the standard methods A complete list of IE-specific properties and methods can be found on the Microsoft website http://msdnmicrosoftcom
Internet Explorer Specific Properties
Two of the more important and powerful proprietary properties that Internet Explorer adds to its implementation of the DOM are innerHTML and outerHTML Though not a part of the W3C DOM standard, they are very useful and can be used to perform a wide range of operations on document nodes Essentially, these two properties provide access to the inner and outer HTML of the node upon which these properties are used The inner HTML of a node is the HTML code contained between the closing bracket (>) of the opening tag and the opening bracket (<) of the closing tag The outer HTML of a node is the code between the opening bracket of the opening tag and the closing bracket of the closing tag For example, consider the HTML tag for a document s title:
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