Practical prototype and scipt aculo us part 22 doc

... on mouseover, and turn white on mouseout. You could rewrite the handlers to take this into account, storing the initial color value somewhere so that it can be restored on mouseout, but you’d just ... and power users, but which ignore the real world and the market-leading browser. Writing JavaScript for today’s Web requires balancing the ideal and the practical. As a way forward, w...

Ngày tải lên: 03/07/2014, 01:20

... gets even more frustrating when extending built-in classes, as Prototype does: String .prototype. strip = function() { // }; String .prototype. gsub = function() { // }; String .prototype. times = ... takes precedence. CHAPTER 2 ■ PROTOTYPE BASICS22 var navItems = [document.getElementById('nav_home'), document.getElementById('nav_archives'), document.getElementById...

Ngày tải lên: 03/07/2014, 01:20

... can return an error status code instead of the typical 200. And it can use the content of the response to present a friend- lier error message to the user. PHP lets us do this rather easily. <?php // ... canonical—we just made it up. But Apache delivers this code just fine, and Prototype properly recognizes it as an error code. Test this in your browser. Open up breakfast.php dir...

Ngày tải lên: 03/07/2014, 01:20

... type="text/javascript"></script> </head> Because we’ll be writing code that uses parts of Prototype, we must include our new script at the end. (Remember, Prototype should be the first script you ... instead, but that’s just a band-aid. With sufficiently com- plex code, we’d be forced to escape quotation marks. By itself it’s not a big deal—just an illustration...

Ngày tải lên: 03/07/2014, 01:20

... kidding me.” No, I’m serious. There are two reasons why Prototype uses the dollar sign ( $) as part of its naming scheme: • As a shortcut for a method that will be used quite often (e.g., $, ... can’t be used as an identifier (just like you can’t define a function named if or while). Oddly enough, super is not used in JavaScript 1.x, but was preemptively reserved for future use. By addin...

Ngày tải lên: 03/07/2014, 01:20

... JavaScript objects gives us a bonus way to use Template. Remember that an array is really just an object with numerals as keys, so Template and String#interpolate can be used with arrays as well: var ... be using JSON simply as a way to communicate with your own server, so security won’t be an issue. But if you happen to be handling JSON from a third party, you must make sure it’s safe t...

Ngày tải lên: 03/07/2014, 01:20

... an element. And the border property is shorthand for specifying a border’s width, style, and color all at once. So we’ve got a box with 10 pixels of padding, 25 pixels of margin, and 5 pixels ... of the ordinary docu- ment “flow”—its statically positioned brethren no longer account for it or make space for it. CHAPTER 9 ■ WHAT YOU SHOULD KNOW ABOUT DHTML AND SCRIPT .ACULO. US 201 $...

Ngày tải lên: 03/07/2014, 01:20

... needs, you can write custom code on top of script .aculo. us. The script .aculo. us Web Site You can learn more about script .aculo. us at its web site, at http://script .aculo. us, which includes collaborative, ... twins. Similarities to Prototype If you know Prototype, you’ll have no trouble picking up script .aculo. us. • It’s MIT-licensed. script .aculo. us carries the same...

Ngày tải lên: 03/07/2014, 01:20

... a constant speed. script .aculo. us Effects Fortunately, script .aculo. us manages all these annoying details for you. It creates a base class for running effects, and then defines scads and scads of specific ... SCRIPT .ACULO. US EFFECTS 221 In other words, from the starting and ending values of each element’s properties, Effect.Morph figures out which CSS properties it needs t...

Ngày tải lên: 03/07/2014, 01:20

... right above it. So this pair of effects is useful for collapsible panels, accordion menus, and even things like expandable trees. Effects Are Asynchronous We’ve already covered how JavaScript has ... an old soldier), so it’s best used on items that will disappear and not be used again. Likewise, Effect.Appear suggests the creation of something new, so it’s best used on items that haven’t...

Ngày tải lên: 03/07/2014, 01:20