AJAX and PHP

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TServer-Side Techniques with PHP and MySQLIt is important to keep an eye on the Apache error log when your PHP script behavesstrangely. The default location and name of this file is Apache2\logs\error.log, and itcan save you from many headaches.After setting the error-handling routine, we set the content type to XML, and divide the firstreceived number by the second number. Note the usage of $_GET T to read the variables sent usingGET. If you sent your variables using POSTT you should have used $_POST. Alternatively, you canuse $_REQUEST, which finds variables sent with any method (including cookies); but it is generallyrecommended to avoid using it because it is a bit slower than the others.// specify that we are outputting an XML documentheader('Content-Type: text/xml');// calculate the result$firstNumber = $_GET['firstNumber'];$secondNumber = $_GET['secondNumber'];$result = $firstNumber / $secondNumber;The division operation will generate an error if $secondNumber is 0. In this case, we expect theerror-handler script to intercept the error. Note that in a real-world the situation, the professionalway would be to check the value of the variable before calculating the division, but in this case weare interested in checking the error-handling script.After calculating the value, you package it into a nice XML document and output it, just as in theprevious exercise:// create a new XML document$dom = new DOMDocument();// create the root element and add it to the document$response = $dom->createElement('response');$dom->appendChild($response);// add the calculated sqrt value as a text node child of $responseText = $dom->createTextNode($result);$response->appendChild($responseText);// build the XML structure in a string variable$xmlString = $dom->saveXML();// output the XML stringecho $xmlString;?>Let's now have a look at the error-handling script—error_handler.php. This file has the role ofintercepting any error messages generated by PHP, and outputting an error message that makessense, and can be displayed by your JavaScript code:Figure 3.4: Good Looking Error Message76
Chapter 3Without the customized error handler, the error message you will get would be:Figure 3.5: Bad Looking Error MessageThe error message will look like Figure 3.5 if the display_errors option in php.ini isOn. By default, that option is Off and the errors are logged just in the Apache error log,but while writing code it may help to make them be displayed as well. If the code wasproduction code, both error messages would have been inappropriate. You should nevershow such debugging information to your end users.So what happens in error_handler.php? First, the file uses the set_error_handler function toestablish a new error-handling function:77
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AJAX and PHPBuilding Responsive Web
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CreditsAuthorsCristian DarieBrinzar
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Filip Cherecheş-Toşa is a web dev
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Table of ContentsPreface 1Chapter 1
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Table of ContentsPreparing Your *ni
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PrefaceWhat This Book CoversChapter
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PrefaceAny command-line input and o
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O}EN PORTADAEl aborto...más allá
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Chapter 1Because end-user satisfact
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Chapter 1Three points for you to ke
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Chapter 1With JavaScript, developer
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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 1done typing. (This method
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Chapter 1All exercises from this bo
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etrieve the user name$name = $_GET[
Page 35: Chapter 1If you're curious to test
Page 38 and 39: AJAX and the Future of Web Applicat
Page 40 and 41: Client-Side Techniques with Smarter
Page 51 and 52: Chapter 2font-size: 10pt;}.TableCon
Page 53 and 54: Chapter 2Creating the XMLHttpReques
Page 55 and 56: Chapter 2You could, for example, ch
Page 57 and 58: You will learn the most interesting
Page 59 and 60: Chapter 2The safer version of proce
Page 61 and 62: Chapter 24. Create a file called as
Page 63 and 64: Chapter 2Figure 2.6: The Four HTTP
Page 65 and 66: Chapter 2}}else{// display status m
Page 67 and 68: Chapter 2}{// try to create XMLHttp
Page 69 and 70: Chapter 2The responseXML method of
Page 71 and 72: Chapter 2Figure 2.10: Opera Display
Page 73 and 74: I admit that the following piece of
Page 75 and 76: 3Server-Side Techniqueswith PHP and
Page 77 and 78: Chapter 3}for (var i=0; i
Page 79 and 80: Chapter 3// create the element$boo
Page 81 and 82: Chapter 3// create the root elemen
Page 83 and 84: Chapter 3// read a file from the se
Page 85: Chapter 3Figure 3.3: PHP Parameters
Page 89 and 90: }}// display the error in case of f
Page 91 and 92: Chapter 3Figure 3.7: Connecting to
Page 93 and 94: Chapter 3}}// continue only if HTTP
Page 95 and 96: Chapter 3You can make Firefox liste
Page 97 and 98: Chapter 3}"MSXML2.XMLHTTP.4.0","MSX
Page 99 and 100: 'TEXT: ' . $errStr . chr(10) .'LOCA
Page 101 and 102: etrieve the parameters$num = 1; //
Page 103 and 104: Chapter 3Figure 3.16: Flowchart Des
Page 105 and 106: }Chapter 3// only continue if xmlHt
Page 107 and 108: }throw(response.length == 0 ? "Serv
Page 109 and 110: function process(){// ...if (reques
Page 111 and 112: Chapter 3Working with MySQLA back-e
Page 113 and 114: Chapter 3Figure 3.17: Executing SQL
Page 115 and 116: Chapter 3SELECT user_id, user_name
Page 117 and 118: 3. In your foundations folder, crea
Page 119 and 120: Chapter 3After these commands execu
Page 121 and 122: Chapter 3• friendly.php is a PHP
Page 123 and 124: This example requires a JavaScript-
Page 125 and 126: }}// try to connect to the servertr
Page 127 and 128: Chapter 3}// create HTML-formatted
Page 129: Chapter 3On the server side, all th
Page 132 and 133: AJAX Form ValidationThe code in thi
Page 134 and 135: AJAX Form ValidationFigure 4.2: The
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AJAX Form ValidationNote that deali
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AJAX Form Validation"3" => "March",
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AJAX Form Validationclass="">Please
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AJAX Form Validation}}alert("Error
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AJAX Form Validation// output the e
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AJAX Form Validationbreak;}}// Chec
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AJAX Form Validationprivate functio
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AJAX Form ValidationThe onblur even
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AJAX Form ValidationAfter this basi
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AJAX Form ValidationSummaryWhile we
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AJAX ChatFigure 5.1: MeeboMeebo off
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AJAX ChatThe messages for the AJAX
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AJAX Chat// destructor closes datab
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AJAX Chat}}?>8. Create another file
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AJAX Chat/* creates an XMLHttpReque
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AJAX Chat}}xmlHttpGetMessages.send(
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AJAX Chatfunction handleKey(e){// g
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AJAX Chat12. After having talked ab
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AJAX ChatOn pressing the Send butto
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AJAX ChatSummaryAt the beginning of
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AJAX Suggest and AutocompleteIt's a
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AJAX Suggest and AutocompleteTime f
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AJAX Suggest and Autocomplete170'FR
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AJAX Suggest and Autocomplete10. Cr
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AJAX Suggest and Autocomplete}if(ca
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AJAX Suggest and Autocomplete}if(re
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AJAX Suggest and Autocomplete}var k
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AJAX Suggest and AutocompletecrtLin
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AJAX Suggest and AutocompleteFigure
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AJAX Suggest and Autocompletewant c
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AJAX Suggest and AutocompleteNext,
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AJAX Suggest and Autocompletein sug
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AJAX Real-Time Charting with SVGFor
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AJAX Real-Time Charting with SVG0.0
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AJAX Real-Time Charting with SVG3.
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AJAX Real-Time Charting with SVG//
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AJAX Real-Time Charting with SVG//
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AJAX Real-Time Charting with SVGcoo
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AJAX Real-Time Charting with SVG•
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AJAX GridImplementing the AJAX Grid
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AJAX GridCREATE TABLE product(produ
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AJAX Grid}// execute the queryif ($
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AJAX Grid// clear any output that h
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AJAX Grid212// the id of the grid d
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AJAX Grid// handle receiving the se
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AJAX Grid// handle receiving a resp
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AJAX GridAs usual on the server, we
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AJAX Grid220}{}stylesheetDoc = crea
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9AJAX RSS ReaderIn the last few yea
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Chapter 9Figure 9.1: Managing RSS S
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header('Pragma: no-cache');header('
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Chapter 9Loading feed...About the A
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Chapter 9}// continue if the proces
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Chapter 9}width: 410px;background-c
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And finally, we send the HTTP reque
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10AJAX Drag and DropWhen drag-and-d
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Chapter 10The Prototype features ar
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Chapter 10When dropping a task on t
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Chapter 10DROP HERE TO DELETE7. Cre
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header('Expires: Fri, 25 Dec 1980 0
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Chapter 10}}}else if (action =="del
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Chapter 1011. Load http://localhost
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details are saved using a cache sys
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Chapter 10SummaryThis is it! You've
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Preparing Your Working EnvironmentT
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Preparing Your Working EnvironmentA
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Preparing Your Working Environment1
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Preparing Your Working EnvironmentA
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Preparing Your Working Environment6
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IndexAabort() method, XMLHttpReques
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exception handling, JavaScript, 43
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PHP Parameters and Error Handlingre
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updateChart() function, realTimeCha
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AJAX and PHP

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