AJAX and PHP

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AJAX Drag and Drop A few websites have already put this into practice. One such example is Panic Goods—selling t-shirts! The URL for this is: http://www.panic.com/goods. Notice the light blue bar on the bottom of the screen? That's the actual shopping cart. Just drag some t-shirts from the catalog, and drop them into the shopping cart, to see how the cart performs. Products are lined up in the cart and it's easy to see what you have chosen and for what amount. Drag items outside the light blue bar to remove them from the cart. Pretty impressive, isn't it? Sortable Lists There's a type of list we probably use daily, namely, a to-do list. We usually use yellow Post-its and some of us even use specialized software. But with so many new web applications available out there, surely there must be a dozen to-do list applications! I'll just mention Ta-da Lists (http://www.tadalist.com), created by 37signals. This company has actually reinvented the entire concept of web applications and has taken it to the next level. Ta-da Lists, one of its first products, is a tool that allows you to create several to-do lists, each with its own items (things to do, that is). It's a really helpful tool and a lot of people use it, although most of them have upgraded to other 37signals products like Basecamp (http://www.basecamphq.com) and Backpack (http://www.backpackit.com). Despite its intuitive user interface and easy-to-use actions, Ta-da Lists lacks a very basic feature that would greatly increase its usability: dragging and dropping list items, thus reordering the list. To reorder a list in Ta-da Lists, you have to click on a link that will refresh the page and display four arrow buttons (bring to front, move up, move down, and send to back). Although this implementation works well, a drag-and-drop system would make it faster and easier to use. 37signals have improved this functionality in Basecamp, though, and the to-do lists in there have draggable items—an upgrade that proves the usability of the drag-and-drop concept. Building the AJAX Drag-and-Drop Sortable List Application One thing that sets this application apart from other applications we've built in this book is that in this case, we are going to use two external JavaScript frameworks: Prototype and script.aculo.us. "Prototype is a JavaScript framework that aims to ease development of dynamic web applications." It was created by Sam Stephenson and is quickly becoming the JavaScript framework, because of its great functionality. Prototype is distributed under an MIT-style license and it can be downloaded from http://prototype.conio.net. If you want to learn more about Prototype, check out the tutorial on http://www.particletree.com/features/quick-guide-to-prototype. 238 www.it-ebooks.info
Chapter 10 The Prototype features are: • Complete object-orientation • Utility functions • Form helper functions • AJAX support • Periodical executer Another pioneer of JavaScript development is Thomas Fuchs, the man who built the great JavaScript library—script.aculo.us—a library that provides spectacular visual effects. We'll be using some of these features in our drag-and-drop application (more specifically, the dragging and dropping features). Script.aculo.us is built on top of Prototype, thus inheriting all Prototypes' features. Features of Script.aculo.us are: • Complete object-orientation • Visual effects (fade in, fade out, grow, shrink, blind down, blind up, shake, etc.) • Drag-and-drop support • Autocompletion • In-place editing • Slider controls The application we're about to build will be a small task management application and will allow us to create new tasks, reorder existing tasks, and delete tasks. Summarizing the features: • Database back end • Drag-and-drop items • Add new tasks with AJAX • Instant database update when drag and dropping • Delete a task by dragging and dropping it into a special designated area 239 www.it-ebooks.info
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AJAX and PHP Building Responsive We
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About the Authors Cristian Darie is
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About the Reviewers Emilian Balanes
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Table of Contents Preface 1 Chapter
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Table of Contents Chapter 6: AJAX S
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Preface AJAX is a complex phenomeno
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Preface What You Need for This Book
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Preface Errata Although we have tak
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1 AJAX and the Future of Web Applic
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Chapter 1 Because end-user satisfac
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Chapter 1 Three points for you to k
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Chapter 1 With JavaScript, develope
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interrupting the user from his or h
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• Creating simple online chat sol
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Chapter 1 done typing. (This method
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Chapter 1 All exercises from this b
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etrieve the user name $name = $_GET
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Chapter 1 If you're curious to test
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Chapter 1 request. In our case, thi
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2 Client-Side Techniques with Smart
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AJAX Foundations: JavaScript and
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Chapter 2 • Because there is no s
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Time for Action—Using JavaScript
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Even More DOM In the previous exerc
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Chapter 2 What Just Happened? Well,
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Chapter 2 font-size: 10pt; } .Table
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Chapter 2 Creating the XMLHttpReque
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Chapter 2 You could, for example, c
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You will learn the most interesting
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Chapter 2 The safer version of proc
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Chapter 2 4. Create a file call
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Chapter 2 Figure 2.6: The Four HTTP
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Chapter 2 } } else { // display sta
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Chapter 2 } { // try to create XMLH
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Chapter 2 The responseXML method of
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Chapter 2 Figure 2.10: Opera Displa
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I admit that the following piece of
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3 Server-Side Techniques with PHP a
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Chapter 3 } for (var i=0; i
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Chapter 3 // create the element $b
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Chapter 3 // create the root eleme
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Chapter 3 // read a file from the s
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Chapter 3 Figure 3.3: PHP Parameter
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Chapter 3 Without the customized er
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} } // display the error in case of
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Chapter 3 Figure 3.7: Connecting to
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Chapter 3 } } // continue only if H
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Chapter 3 You can make Firefox list
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Chapter 3 } "MSXML2.XMLHTTP.4.0", "
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'TEXT: ' . $errStr . chr(10) . 'LOC
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etrieve the parameters $num = 1; //
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Chapter 3 Figure 3.16: Flowchart De
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} Chapter 3 // only continue if xml
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} throw(response.length == 0 ? "Ser
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function process() { // ... if (req
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Chapter 3 Working with MySQL A back
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Chapter 3 Figure 3.17: Executing SQ
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Chapter 3 SELECT user_id, user_name
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3. In your foundations folder, crea
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Chapter 3 After these commands exec
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Chapter 3 • friendly.php is a PHP
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This example requires a JavaSc
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} } // try to connect to the server
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Chapter 3 } // create HTML-formatte
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Chapter 3 On the server side, all t
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4 AJAX Form Validation Validating i
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Chapter 4 Always validate user inpu
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Chapter 4 Figure 4.4: Successful Su
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Chapter 4 .left { margin-left: 150p
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Chapter 4 value="" />
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Registration Successfull! <<
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Chapter 4 } } { // display error me
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Chapter 4 require_once ('config.php
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Chapter 4 } { } $_POST['txtBthDay']
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Chapter 4 } } ?> return ($value ==
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Chapter 4 The field ID and value re
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Chapter 4 If we are dealing with cl
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5 AJAX Chat We are living in a worl
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Chapter 5 Implementing AJAX Chat We
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Chapter 5 // default the last id to
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} Chapter 5 ' DATE_FORMAT(posted_on
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Chapter 5 AJAX Chat Your b
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* function called when the Send but
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} } // retrieve the arrays from the
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Chapter 5 } } } // call server asyn
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Chapter 5 If you analyze the code f
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The business logic behind chat.php
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6 AJAX Suggest and Autocomplete Sug
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Chapter 6 The clever part of the Ja
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Chapter 6 6. Create another file na
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Chapter 6 { } a { } font-weight: bo
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Chapter 6 } { // try to create XMLH
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Chapter 6 } } } } { } displayError(
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Chapter 6 div += "" + "" + crtFunct
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} } // select the new suggestion an
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Chapter 6 } } else // FF if (oText.
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Chapter 6 Figure 6.4: PHP Documenta
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Chapter 6 We have talked about cach
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Page 201 and 202: 7 AJAX Real-Time Charting with SVG
Page 203 and 204: Chapter 7 Figure 7.1: SVG Chart The
Page 205 and 206: Chapter 7 Figure 7.2: SVG Charting
Page 207 and 208: Chapter 7 } { xmlHttp.onreadystatec
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Page 211 and 212: Chapter 7 } // Supported by Mozilla
Page 213 and 214: Chapter 7 • All HTTP requests go
Page 215 and 216: 8 AJAX Grid Data grids have always
Page 217 and 218: Chapter 8 Figure 8.2: AJAX Grid in
Page 219 and 220: $name = $_GET['name']; // update th
Page 221 and 222: } Chapter 8 if (!isset($_SESSION['r
Page 223 and 224: Chapter 8 # editId(, true) Edit
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Page 231 and 232: Chapter 8 On the client, this data
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Page 235 and 236: 9 AJAX RSS Reader In the last few y
Page 237 and 238: Chapter 9 Figure 9.1: Managing RSS
Page 239 and 240: header('Pragma: no-cache'); header(
Page 241 and 242: Chapter 9 Loading feed... Abou
Page 243 and 244: Chapter 9 } // continue if the proc
Page 245 and 246: Chapter 9 } width: 410px; backgroun
Page 247 and 248: And finally, we send the HTTP reque
Page 249: 10 AJAX Drag and Drop When drag-and
Page 253 and 254: Chapter 10 When dropping a task on
Page 255 and 256: Chapter 10 DROP HERE TO DELETE
Page 257 and 258: header('Expires: Fri, 25 Dec 1980 0
Page 259 and 260: Chapter 10 } } } else if (action ==
Page 261 and 262: Chapter 10 11. Load http://localhos
Page 263 and 264: details are saved using a cache sys
Page 265 and 266: Chapter 10 Summary This is it! You'
Page 267 and 268: A Preparing Your Working Environmen
Page 269 and 270: Appendix A During installation you'
Page 271 and 272: Before going through any case studi
Page 273 and 274: Appendix A Preparing Your *nix Play
Page 275 and 276: 8. Finally, point your web browser
Page 277 and 278: 2. Write ajax in the Create a new d
Page 279 and 280: Index A abort() method, XMLHttpRequ
Page 281 and 282: exception handling, JavaScript, 43
Page 283 and 284: PHP Parameters and Error Handling r
Page 285 and 286: updateChart() function, realTimeCha
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AJAX and PHP

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