AJAX and PHP

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Client-Side Techniques with Smarter JavaScript // handles the response received from the server function handleServerResponse() { // read the message from the server var xmlResponse = xmlHttp.responseXML; // obtain the XML's document element xmlRoot = xmlResponse.documentElement; // obtain arrays with book titles and ISBNs titleArray = xmlRoot.getElementsByTagName("title"); isbnArray = xmlRoot.getElementsByTagName("isbn"); // generate HTML output var html = ""; // iterate through the arrays and create an HTML structure for (var i=0; i
Chapter 2 The responseXML method of the XMLHttpRequest object wraps the received response as a DOM document. If the response isn't a valid XML document, the browser might throw an error. However this depends on the specific browser you're using, because each JavaScript and DOM implementation behaves in its own way. We will get back to bulletproofing the XML reading code in a minute; for now, let us assume the XML document is valid, and let's see how we read it. As you know, an XML document must have one (and only one) document element, which is the root element. In our case this is . You will usually need a reference to the document element to start with, as we did in our exercise: // obtain the XML's document element xmlRoot = xmlResponse.documentElement; The next step was to create two arrays, one with book titles and one with book ISBNs. We did that using the getElementsByTagName DOM function, which parses the entire XML file and retrieves the elements with the specified name: // obtain arrays with book titles and ISBNs titleArray = xmlRoot.getElementsByTagName("title"); isbnArray = xmlRoot.getElementsByTagName("isbn"); This is, of course, one of the many ways in which you can read an XML file using the DOM. A much more powerful way is to use XPath, which allows you to define powerful queries on your XML document. . The two arrays that we generated are arrays of DOM elements. In our case, the text that we want displayed is the first child element of the title and isbn elements (the first child element is the text element that contains the data we want to display). } // generate HTML output var html = ""; // iterate through the arrays and create an HTML structure for (var i=0; i
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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
Page 19 and 20: 1 AJAX and the Future of Web Applic
Page 21 and 22: Chapter 1 Because end-user satisfac
Page 23 and 24: Chapter 1 Three points for you to k
Page 25 and 26: Chapter 1 With JavaScript, develope
Page 27 and 28: interrupting the user from his or h
Page 29 and 30: • Creating simple online chat sol
Page 31 and 32: Chapter 1 done typing. (This method
Page 33 and 34: Chapter 1 All exercises from this b
Page 35 and 36: etrieve the user name $name = $_GET
Page 37 and 38: Chapter 1 If you're curious to test
Page 39 and 40: Chapter 1 request. In our case, thi
Page 41 and 42: 2 Client-Side Techniques with Smart
Page 43 and 44: AJAX Foundations: JavaScript and
Page 45 and 46: Chapter 2 • Because there is no s
Page 47 and 48: Time for Action—Using JavaScript
Page 49 and 50: Even More DOM In the previous exerc
Page 51 and 52: Chapter 2 What Just Happened? Well,
Page 53 and 54: Chapter 2 font-size: 10pt; } .Table
Page 55 and 56: Chapter 2 Creating the XMLHttpReque
Page 57 and 58: Chapter 2 You could, for example, c
Page 59 and 60: You will learn the most interesting
Page 61 and 62: Chapter 2 The safer version of proc
Page 63 and 64: Chapter 2 4. Create a file call
Page 65 and 66: Chapter 2 Figure 2.6: The Four HTTP
Page 67 and 68: Chapter 2 } } else { // display sta
Page 69: Chapter 2 } { // try to create XMLH
Page 73 and 74: Chapter 2 Figure 2.10: Opera Displa
Page 75 and 76: I admit that the following piece of
Page 77 and 78: 3 Server-Side Techniques with PHP a
Page 79 and 80: Chapter 3 } for (var i=0; i
Page 81 and 82: Chapter 3 // create the element $b
Page 83 and 84: Chapter 3 // create the root eleme
Page 85 and 86: Chapter 3 // read a file from the s
Page 87 and 88: Chapter 3 Figure 3.3: PHP Parameter
Page 89 and 90: Chapter 3 Without the customized er
Page 91 and 92: } } // display the error in case of
Page 93 and 94: Chapter 3 Figure 3.7: Connecting to
Page 95 and 96: Chapter 3 } } // continue only if H
Page 97 and 98: Chapter 3 You can make Firefox list
Page 99 and 100: Chapter 3 } "MSXML2.XMLHTTP.4.0", "
Page 101 and 102: 'TEXT: ' . $errStr . chr(10) . 'LOC
Page 103 and 104: etrieve the parameters $num = 1; //
Page 105 and 106: Chapter 3 Figure 3.16: Flowchart De
Page 107 and 108: } Chapter 3 // only continue if xml
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
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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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Chapter 6 visible, we need to scrol
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7 AJAX Real-Time Charting with SVG
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Chapter 7 Figure 7.1: SVG Chart The
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Chapter 7 Figure 7.2: SVG Charting
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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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AJAX and PHP

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