AJAX and PHP

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Server-Side Techniques with PHP and MySQL}// if the response is long enough, or if it is void, we assume we just// received a server-side error reportif(response.length > 5 || response.length == 0)throw(response.length == 0 ? "Server error" : response);// obtain a reference to the element on the pagemyDiv = document.getElementById("myDivElement");// display the HTML outputif (response >= minServerBufferLevel){// display new message to usermyDiv.innerHTML += "Server buffer level is at " + response + "%, "+ "starting to retrieve new numbers. ";// increases counter to start retrieving new numbersrequestsCounter++;// reinitiate sequencesetTimeout("process();", updateInterval * 1000);}else{// display new message to usermyDiv.innerHTML += "Server buffer is too low (" + response + "%), "+ "will check again in " + updateIntervalIfServerBusy+ " seconds. ";// reinitiate sequencesetTimeout("process();", updateIntervalIfServerBusy * 1000);}// function called when the state of the HTTP request changesfunction handleGettingNumber(){// when readyState is 4, we are ready to read the server responseif (xmlHttp.readyState == 4){// continue only if HTTP status is "OK"if (xmlHttp.status == 200){try{// do something with the response from the servergetNumber();}catch(e){// display error messagealert("Error receiving new number:\n" + e.toString());}}else{// display status messagealert("Error receiving new number:\n" + xmlHttp.statusText);}}}// handles the response received from the serverfunction getNumber(){// retrieve the server's responsevar response = xmlHttp.responseText;// if the response is long enough, or if it is void, we assume we just// received a server-side error reportif(response.length > 5 || response.length == 0)96
}throw(response.length == 0 ? "Server error" : response);// obtain a reference to the element on the pagemyDiv = document.getElementById("myDivElement");// display the HTML outputmyDiv.innerHTML += "New random number retrieved from server: "+ response + "";// increase requests countrequestsCounter++;// reinitiate sequencessetTimeout("process();", updateInterval * 1000);Chapter 34. In the same folder, create smartproxyping.php:
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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 = $_GET[
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Chapter 1If you're curious to test
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AJAX and the Future of Web Applicat
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Client-Side Techniques with Smarter
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Chapter 2font-size: 10pt;}.TableCon
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Chapter 2Creating the XMLHttpReques
Page 55 and 56: Chapter 2You could, for example, ch
Page 57 and 58: You will learn the most interesting
Page 59 and 60: Chapter 2The safer version of proce
Page 61 and 62: Chapter 24. Create a file called as
Page 63 and 64: Chapter 2Figure 2.6: The Four HTTP
Page 65 and 66: Chapter 2}}else{// display status m
Page 67 and 68: Chapter 2}{// try to create XMLHttp
Page 69 and 70: Chapter 2The responseXML method of
Page 71 and 72: Chapter 2Figure 2.10: Opera Display
Page 73 and 74: I admit that the following piece of
Page 75 and 76: 3Server-Side Techniqueswith PHP and
Page 77 and 78: Chapter 3}for (var i=0; i
Page 79 and 80: Chapter 3// create the element$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 and 86: Chapter 3Figure 3.3: PHP Parameters
Page 87 and 88: Chapter 3Without the customized err
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: }Chapter 3// only continue if xmlHt
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
Page 136 and 137: AJAX Form ValidationNote that deali
Page 138 and 139: AJAX Form Validation"3" => "March",
Page 140 and 141: AJAX Form Validationclass="">Please
Page 142 and 143: AJAX Form Validation}}alert("Error
Page 144 and 145: AJAX Form Validation// output the e
Page 146 and 147: AJAX Form Validationbreak;}}// Chec
Page 148 and 149: AJAX Form Validationprivate functio
Page 150 and 151: AJAX Form ValidationThe onblur even
Page 152 and 153: AJAX Form ValidationAfter this basi
Page 154 and 155: 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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