Read e-book online DHTML Utopia: Modern Web Design Using JavaScript & DOM PDF

By Stuart Langridge

ISBN-10: 0957921896

ISBN-13: 9780957921894

Written for skilled net designers, this consultant introduces dynamic HTML (DHTML) and techniques of manipulating the rfile item version (DOM) of an HTML record, fidgeting with CSS directives standard info, and utilizing client-side JavaScripts to tie every thing jointly. the writer covers browser characteristic sniffing, animation, types and validation, distant scripting, server conversation, and XPath. dispensed within the U.S. via O?Reilly.

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Extra info for DHTML Utopia: Modern Web Design Using JavaScript & DOM

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In other words, to add your new element as a child of an existing node in the document, we use that node’s appendChild method: 7 Internet Explorer will let you get away without using a dimension, as it assumes that a dimensionless number is actually a pixel measurement. However, do not try to take advantage of this assumption; it will break your code in other browsers, and it’s in violation of the specification. appendChild(sitepoint_link); After this, our page will look a little odd.

Another useful thing to know is that, in order to move the node to its new place in the document, we don’t have to remove it first.

2. 2. The snippet’s DOM tree. getElementsByTagName method is used to retrieve all elements of a particular type. getElementsByTagName('a'); var sitepoint_link = all_links[0]; The all_links variable contains an array, which contains two elements: a reference to the SitePoint link, and a reference to the Yahoo! link. The elements are returned in the order in which they are found in the HTML, so all_links[0] is the SitePoint link and all_links[1] is the Yahoo! link. getElementsByTagName always returns an array, even if only one matching element was found.

A') return null; The variable target should be a reference to the tag on which the user clicked, but it may be something inside the tag (as some browsers handle events this way). In such cases, the above code keeps getting the parent node of that tag until it gets to an tag (which will be the one we want). If we find the document body—a tag—instead, we’ve gone too far. We’ll give up, returning null (nothing) from the function, and going no further. js (excerpt) return target; } The mouseover / mouseout Functions These functions work in similar ways and do very similar things: mouseover is called when we move the mouse over one of our rollover links, while mouseout is called when we move the mouse out again.

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DHTML Utopia: Modern Web Design Using JavaScript & DOM by Stuart Langridge

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