Download Ajax on Rails by Scott Raymond PDF

By Scott Raymond

ISBN-10: 0596527446

ISBN-13: 9780596527440

Learn how to construct dynamic, interactive internet functions utilizing the 2 most vital techniques to internet improvement at the present time: Ajax and the phenomenally effective Ruby on Rails platform. This e-book teaches intermediate to complicated internet builders how you can use either Ajax and Rails to speedy construct high-performance, scalable functions with no being crushed with hundreds of thousands of traces of JavaScript code. greater than simply recipes, you furthermore mght get an intensive, low-level figuring out of what's taking place below the hood. * Ajax on Rails contains 3 totally labored out Rails/Ajax functions, and fast reference sections for Prototype and script.aculo.us.
* trying out classes enable you to get rid of cross-browser JavaScript blunders and DOM debugging nightmares utilizing a mix of Firebug, and Venkman.
* complicated fabric explains the most up-tp-date layout practices for Ajax usability. You'll discover ways to keep away from consumer adventure errors with confirmed layout patterns.
past the how-to, Ajax on Rails is helping you think about whilst Ajax is (and isn't) applicable, and the trade-offs linked to it. For these new to Rails, this e-book offers a short advent, the large photo, a stroll during the install technique, and a few pointers on getting began. If you've already got to work with Rails and search to deepen your ability set, you'll locate dozens of examples drawn from real-world tasks, exhaustive reference for each correct characteristic, and professional recommendation on tips on how to "Ajaxify" your purposes.

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Extra info for Ajax on Rails

Sample text

Which == 18) altPressed = false; }); }); 4. html file. Try pressing the shortcuts that we have just created. You will see that the DIV elements will toggle with a slide effect. How it works... In order to be able to create shortcut keys, first we need to find out which key was pressed. Different browsers have their own methods of determining the value of the pressed key. jQuery normalizes the way this information can be retrieved across browsers. An event object is available to handler functions.

Note the use of echo here. echo is used to output strings on a page. In this case the page has been called through an AJAX request. Hence, the result is sent back to the function that called it. jQuery receives the response and this is available to us as a parameter of the success event handler. We insert the received HTML in a

element with the ID result. 46 Chapter 2 See also  Sending data to PHP later in this chapter  Creating an empty page and loading it in parts Creating a query string automatically for all form elements Getting ready Create a new folder Recipe2 inside the chapter2 directory.

2. Create some DIV elements and assign the dragMe class to customize their appearance. This class will also be used to attach event handlers to the DIV. dragMe { background-color:#8FBC8F; border:1px solid black; color: #fff; float:left; font-family:verdana,arial; font-size:14px; font-weight:bold; height:100px; margin:10px; text-align:center; width:100px; }

36 Chapter 1

Drag Me
Drag Me too

3. In the jQuery code, declare variables that will hold the coordinates of DIV being dragged and the mouse pointer.

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