Download Ajax on Rails by Scott Raymond PDF

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By Scott Raymond

Learn how to construct dynamic, interactive net purposes utilizing the 2 most crucial techniques to net improvement this day: Ajax and the phenomenally effective Ruby on Rails platform. This e-book teaches intermediate to complicated internet builders how one can use either Ajax and Rails to speedy construct high-performance, scalable functions with out being crushed with millions of traces of JavaScript code. greater than simply recipes, you furthermore mght get an intensive, low-level figuring out of what's taking place less than the hood. * Ajax on Rails comprises 3 totally labored out Rails/Ajax purposes, and speedy reference sections for Prototype and script.aculo.us.
* checking out classes assist you cast off cross-browser JavaScript mistakes and DOM debugging nightmares utilizing a mixture of Firebug, and Venkman.
* complicated fabric explains the most up-tp-date layout practices for Ajax usability. You'll learn how to keep away from consumer adventure error with confirmed layout patterns.
past the how-to, Ajax on Rails is helping you think about while Ajax is (and isn't) applicable, and the trade-offs linked to it. For these new to Rails, this publication offers a short advent, the massive photo, a stroll throughout the deploy strategy, and a few pointers on getting begun. If you've already set to work with Rails and search to deepen your ability set, you'll locate dozens of examples drawn from real-world initiatives, exhaustive reference for each appropriate function, and professional suggestion on the right way to "Ajaxify" your purposes.

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Indd 40 10/5/10 7:45 PM10/5/10 7:45 PM CHAPTER 2: SELECTORS Figure 2-1: Enlarging the first letter of an h1. Simply by changing the dot to a colon, thus yielding li:first-child, you have the same end result without the need to go sprinkling classes all over the markup. You may also have picked up on the double-colon syntax used with pseudo-elements. 1. As of this writing, no browser requires that you use the doublecolons before pseudo-elements: A single colon works just fine. As a side note, CSS3 adds the following pseudo-classes, most of which are not widely supported as of this writing: „ :target „ :root „ :nth-child() „ :nth-of-type() „ :nth-last-of-type() „ :first-of-type „ :last-of-type „ :only-of-type „ :only-child „ :last-child „ :empty „ :not() „ :enabled „ :disabled „ :checked 41 TARGETS WITH STYLE It can be very useful to point to a fragment identifier within a document.

Are they likely to have disabled JavaScript? And so on. Of course, those are the same things we have to weigh with any site design, so at least it’s a familiar process. indd 37 10/5/10 7:39 PM10/5/10 7:39 PM PART I: FUNDAMENTALS The script itself will make sure it’s only run when needed, so you could skip the conditional comments. Doing that, though, means that every visitor ends up downloading it whether the browsers will ever run it or not. With the conditional comments, you make sure that only those browsers that have any chance of running the script will bother loading it.

2 for strong elements. Figure 2-3: Crazy strong! indd 45 10/5/10 7:45 PM10/5/10 7:45 PM PART I: FUNDAMENTALS The end result is medium-size Verdana (or other sans-serif if Verdana is not available) text with normal weight. The boldfacing is gone (see Figure 2-4). The reason is that when you leave off bits of a shorthand property’s value, the missing bits are filled in with the default values of the corresponding properties. Therefore, by leaving off the values for the font’s weight, style, and variant, you’re saying: strong {font: normal normal normal small/normal Verdana, sans-serif;} Yes, even the line-height is filled in with its default, which can override any inherited value for the line’s height.

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