AJAX and PHP

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AJAX and the Future of Web ApplicationsFigure 1.7 shows the actions that happen when running this application:Figure 1.7: The Diagram Explaining the Inner Works of Your Quickstart ApplicationSteps 1 through 5 are a typical HTTP request. After making the request, the user needs to waituntil the page gets loaded. With typical (non-AJAX) web applications, such a page reload happensevery time the client needs to get new data from the server.Steps 5 through 9 demonstrate an AJAX-type call—more specifically, a sequence of asynchronousHTTP requests. The server is accessed in the background using the XMLHttpRequest object.During this period the user can continue to use the page normally, as if it was a normal desktopapplication. No page refresh or reload is experienced in order to retrieve data from the server andupdate the web page with that data.Now it's about time to implement this code on your machine. Before moving on, ensure you'veprepared your working environment as shown in Appendix A, where you're guided through how toinstall and set up PHP and Apache, and set up the database used for the examples in this book.(You won't need a database for this quickstart example.)20
Chapter 1All exercises from this book assume that you've installed your machine as shown inAppendix A. If you set up your environment differently you may need to implementvarious changes, such as using different folder names, and so on.Time for Action—Quickstart AJAX1. In Appendix A, you're instructed to set up a web server, and create a web-accessiblefolder called ajax to host all your code for this book. Under the ajax folder, create anew folder called quickstart.2. In the quickstart folder, create a file called index.html, and add the followingcode to it:AJAX with PHP: QuickstartServer wants to know your name:3. Create a new file called quickstart.js, and add the following code:// stores the reference to the XMLHttpRequest objectvar xmlHttp = createXmlHttpRequestObject();// retrieves the XMLHttpRequest objectfunction createXmlHttpRequestObject(){// will store the reference to the XMLHttpRequest objectvar xmlHttp;// if running Internet Explorerif(window.ActiveXObject){try{xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");}catch (e){xmlHttp = false;}}// if running Mozilla or other browserselse{try{xmlHttp = new XMLHttpRequest();}catch (e){xmlHttp = false;}}// return the created object or display an error messageif (!xmlHttp)21
Page 2 and 3: AJAX and PHPBuilding Responsive Web
Page 4 and 5: CreditsAuthorsCristian DarieBrinzar
Page 6 and 7: Filip Cherecheş-Toşa is a web dev
Page 8 and 9: Table of ContentsPreface 1Chapter 1
Page 11 and 12: Table of ContentsPreparing Your *ni
Page 13 and 14: PrefaceWhat This Book CoversChapter
Page 15 and 16: PrefaceAny command-line input and o
Page 17 and 18: O}EN PORTADAEl aborto...más allá
Page 19 and 20: Chapter 1Because end-user satisfact
Page 21 and 22: Chapter 1Three points for you to ke
Page 23 and 24: Chapter 1With JavaScript, developer
Page 25 and 26: interrupting the user from his or h
Page 27 and 28: • Creating simple online chat sol
Page 29: Chapter 1done typing. (This method
Page 33 and 34: 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
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Chapter 3// create the root elemen
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Chapter 3// read a file from the se
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Chapter 3Figure 3.3: PHP Parameters
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Chapter 3Without the customized err
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}}// display the error in case of f
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Chapter 3Figure 3.7: Connecting to
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Chapter 3}}// continue only if HTTP
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Chapter 3You can make Firefox liste
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Chapter 3}"MSXML2.XMLHTTP.4.0","MSX
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'TEXT: ' . $errStr . chr(10) .'LOCA
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etrieve the parameters$num = 1; //
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Chapter 3Figure 3.16: Flowchart Des
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}Chapter 3// only continue if xmlHt
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}throw(response.length == 0 ? "Serv
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function process(){// ...if (reques
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Chapter 3Working with MySQLA back-e
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Chapter 3Figure 3.17: Executing SQL
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Chapter 3SELECT user_id, user_name
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3. In your foundations folder, crea
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Chapter 3After these commands execu
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Chapter 3• friendly.php is a PHP
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This example requires a JavaScript-
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}}// try to connect to the servertr
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Chapter 3}// create HTML-formatted
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Chapter 3On the server side, all th
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AJAX Form ValidationThe code in thi
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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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