|Published (Last):||1 July 2013|
|PDF File Size:||6.68 Mb|
|ePub File Size:||3.56 Mb|
|Price:||Free* [*Free Regsitration Required]|
There is a significantly better method available: The matching DOM tree is shown in Figure 2.
The HTML document shows five images as thumbnails; in this example, they’re thumbnails of individual pages of a scanned-in utkpia.
In addition to appendChildeach node has an insertBefore method, which is called with two arguments: For dhtmml, add numbers: The function is specified using only the name of the function; do not place brackets after it, as in aKeyWasPressedas this would call the function. Pat J on the 01 Jul Another option is to use a regular expression to spot the class name.
When the user mouses over the thumbnail, that thumbnail could become a “viewing area” in which a snippet of the full-sized image is shown. Naturally, making events work cross-browser is not as easy as just following the DOM standard. I have found that many of his scripts take a bit of set up to get working, but they all fulfill the promise that after you get them up and running you can geniunely plop them onto any other page and they will work.
But what if you want to add a lot of dynamic content to a page? You javxscript find them in the code archive for this book. Therefore, javascipt above, the listener function myScriptEventListener can feel safe in using document. An element is a piece of HTML that represents one thing: Keeping your HTML valid avoids all these problems.
Trying to understand each of these rules would be difficult and laborious, and you have better things to do with your time. These first uing chapters should give you a taste of the action. This is the crucial line that sets everything up. It reduces the amount of data we have to manage. If the element has multiple classes, the above condition will always evaluate to false.
The code above is flawed: So, to insert the Yahoo! It is important to note that getElementById is not followed by brackets! An javacsript listener is the thing that grabs the event when it appears, and responds to it.
Sticking to valid HTML means that any problems you find are deemed to be bugs in that browser — bugs that you may be able to work around. Almost everything you do in DHTML will involve attaching code to events, as described in this chapter.
This allows us to talk about the event mouseover and the event handler onmouseover separately.
The rest of the code is simply concerned with picking out the right elements for these lines to work on.