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 & DOM
If the variable or property contains numbers or strings as does offsetHeightfor example then use typeofbecause a number might be 0 zeroand a string might be the empty string “”, both which also evaluate to false:.
Browser sniffing — what little of it remains — should be confined to the dustbin of history. Event handling works in different ways, depending on the browser. We can change the mouseover and mouseout functions to do something else — for example, to make popup help content appear — without needing to start from scratch to get it working. Each browser provides a window.
The childNodes array may contain nothing if the node has no children such nodes are called leaf nodes. The ascendDOM function is called quite often in the code, so you can see the benefit of putting that code into a function. An event is generated, or fired, when something happens to an element: The second line applies the class to a given cell, but our script needs to find the appropriate cells first.
This is because “class” is a JavaScript reserved word.
Modern Web Design Using JavaScript & DOM
This is a very important distinction. The above code iterates through the retrieved list of tags in standard JavaScript fashion. Our intention here is to apply the class hi to the other cells in the row that contains the moused-over cell, and its column. Netscape also provides pageX and pageY, which are mouse coordinates relative to the document. Being able to change the display properties of existing elements, and to read and alter the attributes of those elements, puts a lot of power at your disposal, but the ability to dynamically create or remove parts of a page requires us to leverage a whole new set of techniques.
DHTML Utopia: Modern Web Design Using JavaScript & DOM | Review || Books @ HTML Source
This is called event bubbling shtml an event “bubbles” up through the DOM tree, starting with the target element, until it reaches the top. We’ll explore and fix! Instead, it offers a proprietary and different way to hook up event listeners and gain access to event data. Similarly, a browser that implements the DOM completely and without bugs would make life very easy.
But how do you make your utopla run in response to those events? The possibilities of this recently re-discovered ability have only just started becoming apparent, and the technology has loads of potential.
The browser software captures the user action and sends the event to the right event target. The text of the link, which read “SitePoint” before, has not changed; if we need to alter that, we have to do so separately. They return information on the size and position of an element in pixels. This tutorial provides an introduction to the basics of JavaScript for the total non-programmer.
If there dhtmp any children, their numbering starts at zero. If, before setting up the event listeners, you check that the browser supplies all the DOM features required by the code, event listeners will not be set up for browsers that do not support those features. Since a className is a string, it has all the methods of a string, one of which is replace ; we can call the replace method with a regular expression first parameter and a substitute string second parameter.
Take the following line:. Thanks for the link to Sitepoint. The second function makes sure that the first is connected to the right HTML tag.
To change the highlight, simply change the CSS. The big image would eventually disappear off the top-left corner of the viewing area! To move the Yahoo! We need to walk the DOM tree uropia after all, we have to know where the text node is before we can alter it.
Dhtnl first four chapters should give you a taste of the action. When we mouse-over a thumbnail image, though, the display of that thumbnail changes to show the actual image to which it’s linked, as shown in Figure 4. The function does the following:.
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Trying to understand each of these rules would be difficult and laborious, and you have better things to do with your time. From this last example, we can see more clearly why valid HTML, including properly nested elements, is important.
Exploring the DOM — being able to find, change, add, and remove elements from your document — is a powerful technique all by itself, and is a fundamental aspect of modern DHTML. In fact, uopia text is in a different node: