Load the page in your browser and try out the link-you should see the target element slowly fade away, until it’s removed from the page flow altogether.
In this example, that statement is a method call on ’ Effect.Fade. Remember, link_to_function takes two arguments: the first is the text for the link, and the second is a JavaScript statement to be evaluated. Now let’s use the link_to_function to call an effect on the new element. First, we’ll need an element to try our effects on, so add one to the top of the new index.rhtml: The ’ Effect object is where the magic resides. Remember when desktop publishing arrived in the 1980s, and every neighborhood newsletter suddenly used 10 different fonts, because it could? If at all possible, try not to get similarly drunk on the power of. To address that, visual effects can provide cues that make the interface more natural and discoverable.Ī word of caution: just like special effects in the movies, effects are generally best when you don’t notice them-when they are subtle and unobtrusive, they and contribute something to the plot. But in the last chapter, all the Ajax examples made changes to the page without reloading, which has the potential to become confusing. For example, there’s a basic expectation that web pages are static, that they won’t change once they’re loaded. For more than 10 years, users have gotten used to the way the Web works, and Ajax undermines many of their expectations. More than just mere decoration, visual effects can be essential to providing a good user experience, especially in conjunction with Ajax.
FRAMER X DRAGGABLE CONSTRAINTS FULL
The full answer to those questions will come in Chapter 6, but here’s the short one. You might be wondering: just because visual effects are easy, does that mean they’re a good idea? Isn’t it just eye candy? And what does it have to do with Ajax, anyway? And because the animated effects are time-based (as opposed to frame-based) they work consistently on systems of different speeds. What about cross-platform compatibility? In general, the visual effects work reliably across different browsers ( Internet Explorer 6+ for Windows, Firefox, Safari, Konqeror, Camino, and, with a few exceptions, Opera). Using effects, many of the slick animated transitions that people have come to associate with Flash can be accomplished without plug-ins at all, and in a way that preserves the benefits of HTML. The most popular component of is its Effect object, which is used to attach a variety of cinematic effects to UI events. Now let’s take a look at what is most famous for: its visual effects. If you already created an application-wide layout ( layouts/application.rhtml) and CSS file ( public/stylesheets/application.css) from the beginning of Chapter 3, they will automatically be used for this controller as well. We’ll put the examples for this chapter into a new controller, so from your Rails project directory, run the generator: script/generate controller chapter4 index In some cases, those components are surprisingly complex and yet usable with just a few lines of code. On the other hand, works at a higher level, closer to the application and UI levels, by providing components built on Prototype. Prototype is designed to be an extension of JavaScript-it provides features that arguably ought to be part of the core language, such as convenient methods for data structures, DOM interaction, and easy Ajax calls. Despite the close ties, the two libraries have different goals. In fact, some of what is now was originally part of Prototype. They’re both developed in concert with Rails, and they share very similar coding styles and APIs. The relationship between Prototype and is close. provides eye-catching visual effects and transitions and powerful drag-and-drop elements. In this chapter, we’ll shift attention to, and the Rails helpers that use it.
Most of the last chapter dealt with the Rails helpers that interact with Prototype.
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