AJAX and PHP

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AJAX Chat Figure 5.1: Meebo Meebo offers access to all these services from a single start web page with a user friendly interface, with no pop-up windows, Java applets and so on. By using a solution based on AJAX you can forget about all the problems mentioned in the beginning. Meebo isn't the only web application that offers chat functionality. Even if AJAX is very young, you can already find several other online chat applications and even solutions based on it: • http://www.plasticshore.com/projects/chat/index.html • http://treehouse.ofb.net/chat/?lang=en. • http://www.chategory.org • http://www.socket7.net/lace/ • http://drupal.org/node/27689. It's time to get to work. In the rest of the chapter, we'll implement our own online chat application. 146 www.it-ebooks.info
Chapter 5 Implementing AJAX Chat We'll keep the application simple, modular, and extensible. For this we won't implement a login module, chat rooms, the online users list, etc. By keeping it simple we try to focus on what the goal of this chapter is—AJAX Chat. We will implement the basic chat functions: posting and retrieving messages without causing any page reloads. We'll also let the user pick a color for her or his messages, because this involves an AJAX mechanism that will be another good exercise. Starting from the following application that will be presented in this chapter, we can easily extend it by implementing any other modules that can be found in the solutions presented above and that are not presented here. Take this part as homework for those of you who are interested in it. In order to have these example working you need the GD library. The installation instructions in Appendix A include support for the GD library. The chat application can be tested online at http://ajaxphp.packtpub.com, and it looks like in Figure 5.2. Figure 5.2: AJAX Chat A novelty in this chapter is that you will have two XMLHttpRequest objects. The first one will handle updating the chat window and the second will handle the color picker (when you click on the image, the coordinates are sent to the server, and the server replies with the color code). 147 www.it-ebooks.info
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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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Page 109 and 110: } throw(response.length == 0 ? "Ser
Page 111 and 112: function process() { // ... if (req
Page 113 and 114: Chapter 3 Working with MySQL A back
Page 115 and 116: Chapter 3 Figure 3.17: Executing SQ
Page 117 and 118: Chapter 3 SELECT user_id, user_name
Page 119 and 120: 3. In your foundations folder, crea
Page 121 and 122: Chapter 3 After these commands exec
Page 123 and 124: Chapter 3 • friendly.php is a PHP
Page 125 and 126: This example requires a JavaSc
Page 127 and 128: } } // try to connect to the server
Page 129 and 130: Chapter 3 } // create HTML-formatte
Page 131 and 132: Chapter 3 On the server side, all t
Page 133 and 134: 4 AJAX Form Validation Validating i
Page 135 and 136: Chapter 4 Always validate user inpu
Page 137 and 138: Chapter 4 Figure 4.4: Successful Su
Page 139 and 140: Chapter 4 .left { margin-left: 150p
Page 141 and 142: Chapter 4 value="" />
Page 143 and 144: Registration Successfull! <<
Page 145 and 146: Chapter 4 } } { // display error me
Page 147 and 148: Chapter 4 require_once ('config.php
Page 149 and 150: Chapter 4 } { } $_POST['txtBthDay']
Page 151 and 152: Chapter 4 } } ?> return ($value ==
Page 153 and 154: Chapter 4 The field ID and value re
Page 155 and 156: Chapter 4 If we are dealing with cl
Page 157: 5 AJAX Chat We are living in a worl
Page 161 and 162: Chapter 5 // default the last id to
Page 163 and 164: } Chapter 5 ' DATE_FORMAT(posted_on
Page 165 and 166: Chapter 5 AJAX Chat Your b
Page 167 and 168: * function called when the Send but
Page 169 and 170: } } // retrieve the arrays from the
Page 171 and 172: Chapter 5 } } } // call server asyn
Page 173 and 174: Chapter 5 If you analyze the code f
Page 175 and 176: The business logic behind chat.php
Page 177 and 178: 6 AJAX Suggest and Autocomplete Sug
Page 179 and 180: Chapter 6 The clever part of the Ja
Page 181 and 182: Chapter 6 6. Create another file na
Page 183 and 184: Chapter 6 { } a { } font-weight: bo
Page 185 and 186: Chapter 6 } { // try to create XMLH
Page 187 and 188: Chapter 6 } } } } { } displayError(
Page 189 and 190: Chapter 6 div += "" + "" + crtFunct
Page 191 and 192: } } // select the new suggestion an
Page 193 and 194: Chapter 6 } } else // FF if (oText.
Page 195 and 196: Chapter 6 Figure 6.4: PHP Documenta
Page 197 and 198: Chapter 6 We have talked about cach
Page 199 and 200: Chapter 6 visible, we need to scrol
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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} } // sets the X and Y attributes
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Chapter 7 } // Supported by Mozilla
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Chapter 7 • All HTTP requests go
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8 AJAX Grid Data grids have always
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Chapter 8 Figure 8.2: AJAX Grid in
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$name = $_GET['name']; // update th
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} Chapter 8 if (!isset($_SESSION['r
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Chapter 8 # editId(, true) Edit
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Chapter 8 } // this should work for
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} Chapter 8 if(editableId) editId(e
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} color: darkblue; text-align: righ
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Chapter 8 On the client, this data
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Chapter 8 save() and undo() are hel
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9 AJAX RSS Reader In the last few y
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Chapter 9 Figure 9.1: Managing RSS
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header('Pragma: no-cache'); header(
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Chapter 9 Loading feed... Abou
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Chapter 9 } // continue if the proc
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Chapter 9 } width: 410px; backgroun
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And finally, we send the HTTP reque
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10 AJAX Drag and Drop When drag-and
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Chapter 10 The Prototype features a
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Chapter 10 When dropping a task on
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Chapter 10 DROP HERE TO DELETE
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header('Expires: Fri, 25 Dec 1980 0
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Chapter 10 } } } else if (action ==
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Chapter 10 11. Load http://localhos
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details are saved using a cache sys
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Chapter 10 Summary This is it! You'
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A Preparing Your Working Environmen
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Appendix A During installation you'
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Before going through any case studi
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Appendix A Preparing Your *nix Play
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8. Finally, point your web browser
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2. Write ajax in the Create a new d
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Index A abort() method, XMLHttpRequ
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exception handling, JavaScript, 43
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PHP Parameters and Error Handling r
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updateChart() function, realTimeCha
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