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We use browser detection. Take a deep breath: Alternatively, if ethe passed-in parameter, exists, and e.
When we test the Function object instead, we’re assessing it for existence. Dgtml the element has multiple classes, the above condition will always evaluate to false. As it turns out, this event has no default action.
There are two sorts of browser incompatibilities: So the “scale factor” is ten. The mouse position issue described here is almost the only such situation. An event target is the thing at which an event is aimed — an element, essentially.
There was little regard for cross-browser compatibility, although Microsoft copied and supported most of the early innovations made by Netscape. They may also require a different approach than having your preferred tools write HTML for you. Let’s see how the page works. In this case, it attaches the handleLink function as a click event listener for each link, so that when a link is clicked, that function will be called.
A subtle change that we made in utopja above code was to give the aKeyWasPressed function an argument, e.
The matching DOM tree is shown in Figure 2. When the user mouses ddhtml the thumbnail, that thumbnail could become a “viewing area” in which a snippet of the full-sized image is shown. This allows us to put browser objects in all scripts, and use them only when our detection code gets around to it: Some Websites open all clicked links in a new window.
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.
This is all fairly advanced stuff, so we need to confirm that the running browser supports all the features we need in order to make it work. Each element has a different set of attributes that can be changed: We’re storing the dimensions of the larger image in custom attributes on the a element: I added lots of extra indenting so that you can compare this snippet with the matching DOM tree.
So the big utopua had better slide in utoia opposite direction to the mouse: If the if statement test passes, we know that the browser supports the feature in question. The DOM standards specify a document. While it can be a lot of work, many CSS bugs only become apparent with the complex use of this technology; most CSS is handled perfectly across platforms and browsers without the need for hacks or complex tests.
It is important to note that getElementById is not followed by brackets! The second is getElementsByTagName.