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The getContainingParaNode() method determines if the given node is contained within a paragraph node:
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function getContainingParaNode(oNode) { var testNode; testNode = oNodeparentNode; while (testNode) { if (testNodenodeName == "P") return testNode; testNode = testNodeparentNode; } return null; }
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The function walks up the document hierarchy starting from the given node until it finds a paragraph tag or traverses above the document root It returns the <P>
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8: Providing Automatic Document Navigation
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node if it finds one, or it returns null if the given node is not contained within a <P> tag This particular example may or may not be useful in all cases It is primarily intended to provide a working example of one way of giving users a method of marking their current place in the document Possible customizations of this code include changing the highlight color based upon the clicked element type, using different CSS style rules other than background color, and changing the color of the text itself Alternative methods might involve outlining the selected paragraph or moving a layer containing a special symbol next to the paragraph tag You should choose the method most appropriate for your web pages according to your desired design specifications
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In this chapter, you saw several ways of using the DOM to make web pages more usable and approachable by dynamically adapting to the content contained within the page First, you saw how a document can build a list of bookmarks on-the-fly by searching the content for specially marked tags that indicate where bookmark destinations should be Next, you saw how to automatically generate a table of contents for a web page by scanning the page for <H1> and <H2> tags and building a list of links to the tags in the document Finally, you saw how to help users save their place in a web page by highlighting a portion of the page, making it easy to spot if the user decides to temporarily read another section of the page and then return In the next chapter, we ll examine ways of using the DOM to provide more dynamic user interfaces for your web pages that minimize browser-specific coding, such as creating a color picker, implementing in-place list editing, and pop-up menus
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CHAPTER
Dynamic User Interfaces
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The Document Object Model: Processing Structured Documents
n 8, you saw some examples of how to build web pages that can use the DOM to provide automatic navigational aids to users by adapting to a document s content on-the-fly This is accomplished by reading the structure and content of the page and dynamically configuring some common user interface controls to allow the user to easily move around within the document These navigation controls, such as tables of contents, bookmarks, and so on, can then be reused across multiple pages In this chapter, we ll take a look at how to build web pages with dynamic, interactive, cross-browser user interfaces using the DOM API We ll start with an example that illustrates how to create a dynamically generated color picker that allows users to interactively select a color Then we ll look at how to create lists of items that can be edited in-place Finally, we ll examine how to create pop-up menus using the DOM methods
Building Dynamic User Interfaces with the DOM
Prior to the DOM, building dynamic, engaging user interfaces for web pages usually meant dealing with Dynamic HTML (DHTML) This, in turn, usually meant dealing with incredible headaches because there was no official standardization between the major browser vendors with respect to their proprietary object models and scripting APIs As a result, browser-specific code often needed to be created to accomplish the same user interface results in different browsers from different vendors, and sometimes even between different versions of the same browser from one vendor Though it still isn t quite seamless to build highly interactive user interfaces using completely browser-independent code today, the situation has improved significantly with the introduction of the latest DOM-capable browsers such as Netscape 62 and Internet Explorer 6 In fact, most of the actual document manipulation itself can be accomplished with browser-independent code; it s the interactivity part that s still not quite standardized, such as event processing and style handling Whereas Netscape 62x faithfully supports the DOM Level 2 Events module, Internet Explorer implements its own event handling system Even so, processing events across different browsers isn t as hard as it used to be because Internet Explorer at least follows the same general principles as the DOM specification in its event handling APIs, such as event capture and event bubbling One of the key benefits of using the DOM instead of DHTML to create web-based user interfaces is that every aspect of the page can be modified by the application, not just the parts of the page that the older DHTML browsers specifically make available for manipulation (such as layers and images) In addition, because the
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