|Published (Last):||1 October 2010|
|PDF File Size:||13.38 Mb|
|ePub File Size:||20.12 Mb|
|Price:||Free* [*Free Regsitration Required]|
They may also require a different approach than having your preferred tools write HTML for you. To make modetn work in Safari, we need a second function, which will return false to cancel the event, and which we will assign as the onclick event handler of the link:. This would mean that we could not check for an element having a specific class using the following:.
Follow the Author
Footnotes abound – often just URLs to now broken links – so you have to wonder why he couldn’t have provided the solution at the bottom of the page.
We can apply this effect to tables in an HTML document using event listeners. There are lots of reasons.
Imagine we use the method as follows:.
Our code will set up listeners only on browsers that do support those methods. Javasccript little function is called by the mouseover and mouseout functions.
You must explicitly test for each feature. These are shown in Table 3. This is inconvenient but not catastrophic; it just means that you have to take different actions for different browsers. Take a deep breath: Bad luck if you were after such a beast. Now this isn’t always a bad thing, but when I pick up a sitepoint book, I expect to find it a bit easier to read see “The CSS Anthology” by Rachel Andrew and have it be smoother through the use of more pictures to explain points throughout the learning process.
As such, the code above becomes:. A change event, however, will only be fired by elements whose contents can be changed: In our examples so far, we have handled the keyup event, which is fired when a key is released. The most obvious example is clicking a link: The mouseover and mouseout functions do little other than the actual image swapping work.
The first function does the work of converting the text. So the big image had better slide in the opposite direction to the mouse: When the link is clicked, it will fire a click event, and that code will run.
This approach is called semantic markup — a fancy way of saying, “uses tags to describe meaning. A given event source can be relevant to more than one event listener.
We could do this by setting up an event listener that cancelled the default action of that type of event. Each child is the same type of thing as the parent and can therefore be handled in the same way. So, to insert the Yahoo!
A Web page is a document. The most important page creation step is to check that your HTML is valid. DHTML Utopia is an easy-to-follow, step-by-step tutorial that will show you how to make your websites more slick, dynamic, and usable.
In the code snippet above, we apply a regular expression substitution to that string. We also need to feature-sniff to stop default actions. This is called InterCaps format. If elements are improperly nested, problems arise.