DHTML Utopia: Modern Web Design Using JavaScript & DOM by Stuart contributes to Stylish Scripting: SitePoint’s DHTML and CSS Blog. About The. DHTML Utopia: Modern Web Design Using JavaScript & DOM explores the Document Object Model, remote scripting, Ajax, XML-RPC and. What do Flickr, Google Suggest, Google Maps, and GMail have in common? They all take great advantage of some of the latest modern, unobtrusive DHTML .

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DHTML Utopia: Modern Web Design Using JavaScript and DOM

In the code snippet above, we apply a regular expression substitution to that string. After this change, the browser will see the following document code:. I am quite proficient in each of these languages but when it comes to pulling it all together into a website, I fail. We also need dhml listener to run upon page load, to actually attach the listener to each link. This method clones all attributes of the node and all its child nodes, including IDs, and IDs must be unique within your document.

The findTarget function does nothing but find the link tag for a given event. Moreover, if your site is required to last for any reasonable period of time, new browser versions will be released after your site, and your browser-sniffing code will be unable to account for them.

Modern Web Design Using JavaScript & DOM

We could do this by setting up an event dhtnl that cancelled the default action of that type of event. The top-left corner of the big image should be in the top-left corner of the viewing area: The if statement says: Therefore, they will not run the code enclosed by the if statement; nor will they display an error. When we mouse-over a thumbnail image, ktopia, the display of that thumbnail changes to show the actual image to which it’s linked, as shown in Figure 4.


Editors are a very personal tool, and you might have to kiss a fair few frogs before you find your prince in this regard, but a good editor will seriously speed and simplify your coding work.

DHTML Utopia: Modern Web Design Using JavaScript & DOM — SitePoint

We know that elthe clicked link, is a link object, and that link objects have an href property. We use it to call the addListeners function once the page has loaded. This is because “class” is a JavaScript reserved word. The ascendDOM function is dhtnl quite often in the code, so you can see the benefit of putting that code into a function.

The first approach is to work out which browser is being used, then have a list within your code that states which browser supports which features. CSS makes achieving this kind of effect very easy.

Both major browser manufacturers implemented the DOM Level 1 specification: Suppose the variable node points to the ul element of the DOM tree. Dutml codes in the DOM are a standards mess! The important part is that the information in the page is marked up in a way that describes what it is. The last section of our dhtm has little to do with browser detects, but, dhtlm spent all this time to get the right X and Y coordinates, it makes sense dhhtml understand how to use them. If you already know all these details, you might want to flick through the chapter anyway; you may even be a little surprised by some of it.

An added bonus of using CSS to provide the style information is that we can apply different highlighting to different tables on the page without changing the script. Take this HTML snippet, for example:. It would be nice to be able to grab the Yahoo! On with the show! JavaScript is a simple but powerful programming language. In such cases, the browser gets it wrong. Processing happens as follows. For uotpia, to prevent the click event of a link from navigating to the target of the link, we would normally just use an event listener that prevented the default action of the link:.


In JavaScript, everything can be treated as an object if you try hard enough; methods are no exception! Our code includes the now-familiar addEvent function to carry out cross-browser event hookups. Events have two further important properties: The matching DOM tree dhgml shown in Figure 2.

The only way to do it in Safari at least dhtjl Apple fixes its DOM standard event support is to use an old-style event handler that returns false.

One of the important things the figure illustrates is that the text inside an element is not part of that element. SitePoint Order it from SitePoint. Finally, we looked at a few events in detail, and saw some simple examples of how code can attach to those events and improve the user dht,l on sites that employ these techniques.

We can safely assume in the image check that link. The mouseover and mouseout functions do little other than the actual image swapping work. If the element has multiple classes, the above condition will always evaluate to false. The keypress event is nonstandard i.


I remember the first time I saw an utopoa rollover on a web site, and being blown away by the sheer coolness of such a thing. This updated version of aKeyWasPressed first checks whether a window. Here are the six items in all their detail.

It does seem that there are quite a few “critical” bits, I know! Removing an element is very similar to the process of adding one: You can elect to clone the node only — not its children — by passing false to the cloneNode method.


Walking a tree is easy because any element node can be considered as the top of its own little tree.