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These days, it s nearly impossible to discuss web programming of any kind without mentioning AJAX Sites like Facebook would not even be possible without it Imagine having to refresh the entire page every time you clicked a link within the Facebook chrome to leave a comment, flagged something you Like, or clicked an application tab in your profile For all its detractors,AJAX has undoubtedly revolutionized the user experience on
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the web It seems ludicrous to not have access to AJAX when building a web application for any platform, not just Facebook AJAX
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Asynchronous JavaScript and XML (AJAX) is comprised of a set of client-side web-development techniques that creates dynamic and interactive web content With it, web applications can asynchronously fetch data without modifying the operation of or causing a refresh of an existing page Much of AJAX s functionality is implemented using the browser s XMLHttpRequest object; however, although its name suggests it, AJAX does not actually require either JavaScript or XML
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However, when Facebook first launched the developer platform, there was no FBJS, JavaScript, or AJAX support for FBML applications If your application needed to use AJAX, it was required to use IFrame-based canvas pages and your own implementation of AJAX primitives most likely, via a third-party JavaScript library But, using IFrame-based pages had a cost:You could not use the FBML controls that made it easy for developers to make applications that had the look and feel of Facebook itself Facebook understood the pain developers faced and provided an AJAX-like functionality for FBML called Mock AJAX Today, although there is full AJAX support included as part of FBJS, Mock AJAX is still available for use on profiles, application tabs, or canvas pages, and it is required for some FBML tags, such as <fb:dialog> Mock AJAX uses a set of special FBML attributes that Facebook parses from the FBML and replaces it with AJAX-like behaviors (for example, modifying only portions of element content on a page without reloading it or dynamically controlling element visibility based on user action) We ll update Compliments to use Mock AJAX to submit the form In the process, we cover many of the Mock AJAX attributes you can use Note that we do not update the application to display a Feed form or actually submit a compliment to Facebook via Mock AJAXWe just update it to specifically demonstrate how Mock AJAX works First, create and save a new script in your application s root directory named mock_ajax_handlerphpThe code for this file is found in Listing 1112
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Listing 1112 mock_ajax_handlerphp: Mock AJAX Form Handler
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< php require_once dirname(__FILE__)'/inc/globalsinc'; require_once dirname(__FILE__)'/inc/utilsinc'; require_once dirname(__FILE__)'/inc/dbinc'; require_once dirname(__FILE__)'/inc/profileinc'; dumpRequestVars(); $result = " <fb:dialog id='errorDialog'> <fb:dialog-title>Compliment Validation Error</fb:dialog-title> <fb:dialog-content>%s</fb:dialog-content> <fb:dialog-button type='button' value='OK' close_dialog='true'/> </fb:dialog>
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11 FBJS, Mock AJAX, and Flash
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Listing 1112
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Continued
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<a href='#' clicktoshowdialog='errorDialog' clicktohide='formResult' style='font-weight:bold;font-size:larger;color:yellow;background:red;'> Click here for form validation errors! </a>"; if( !isset($_POST['uid']) || !isset($_POST['target'])) { $result = sprintf($result, 'You must select a friend' ); } else if( !isset($_POST['compliment'])){ $result = sprintf($result, 'You must enter a compliment'); } else if( !isset($_POST['category'])) { $result = sprintf($result, 'You must select a compliment type'); } else { $target = $_POST['target']; $compliment = trim($_POST['compliment']); $category = $_POST['category']; $facebook = new Facebook(FB_API_KEY, FB_APP_SECRET); $db = new DB(); $sender = $facebook->user; $db->addCompliment($sender, $target, $category, $compliment); updateProfileBox($sender); // start filling in our template $comp = $g_categories[$category]; $imageSrc $imageLink = LOCAL_APP_URL'/img/'$comp['bigimg']; = LOCAL_APP_URL;
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$result = " <h1>Your Compliment to <fb:name uid='$target'></fb:name> was sent</h1> <p> <fb:profile-pic size='square' uid='$target'> </fb:profile-pic> <img class='categoryImg' src='$imageSrc' ></img> <fb:name uid='$target'></fb:name> is <b>'{$comp['title']}' </b> because $compliment </p>"; } echo $result; >
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In Listing 1112, the first thing to notice is the use of the <fb:dialog>, <fb:
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dialogtitle>, <fb:dialog-content>, and <fb:dialog-button> tags to create a Facebook
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popup dialog using FBML instead of FBJS If you look at the HTML and JavaScript rendered from this FBML, you can see that it creates a dialog in a similar fashion to the way we did with FBJSThe one thing that s different here is that, unlike the FBJS dialogs, the FBML dialog cannot be shown automatically because FBML is rendered on Facebook s servers, not on the clientThis is the reason for the <a> tag and its clicktoshowdialog Mock AJAX attributeApplying this attribute to any clickable DOM element allows you to show the dialog when the element is clicked Also note that the <a> element sets another Mock AJAX attribute, clicktohide, to the ID of a <div> into which we place the results of the form submission Now, we need to modify the form code in indexphp to use Mock AJAX instead of a normal POST to submit the formWe just add another button to the form in indexphp to handle submission via Mock AJAX, and we add a hidden <div> element to accept the results of the Mock AJAX call the very same one whose ID was set in the clicktohide attribute of the <a> element in Listing 1112 First, add a new <div> element to the page right after the closing </script> tag and before the <div id='panel'> element Refer to Listing 114 for the full <form> code; we just show the new code in context in bold:
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</script> <div id='formResult' class='success' style='display:none;'></div> <div id='panel' class='panel'> <form method='POST' id='complimentform' onsubmit='return submitForm(this);'>
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Next, add another <input> button next to the existing one from the formAgain, new code is shown in bold:
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<input class='inputbutton' type='submit' name='submitCompliment' label='Send Compliment' value='Send Compliment'/> <input class='inputbutton' type='submit' name='submitComplimentMockAJAX' clickrewriteurl='"LOCAL_APP_URL"/mock_ajax_handlerphp' clickrewriteform='complimentform' clickrewriteid='formResult' clicktoshow='formResult' label='Send Compliment Mock AJAX' value='Send Compliment via Mock AJAX'/> </form>
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Finally, add the success style to maincss:
success {padding: 3px; text-align: center;}
Reload the application canvas page and click the Send Compliment via Mock AJAX buttonYou can see something similar to what s shown in Figure 117 Notice that a bold link is displayed at the top of the form, which indicates that some validation errors have occurred Note that the current form validation code in the submitForm() function did