FBJS, Mock AJAX, and Flash in Java

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11 FBJS, Mock AJAX, and Flash
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// Handle the result of the AJAX call by displaying a feed dialog // and updating the canvas with a success message ajaxondone = function(data) { showFeedDialog(data); var statusDiv = documentgetElementById('formResult'); statusDivsetInnerFBML(datafbml_markup); };
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Now, it s clear why the AjaxJSON response type is so handyWe get back formatted FBML to update our user interface and the data needed to create a Feed story Now, when you submit the form, you are prompted with a Feed story submission dialog like the one shown in Figure 1115 Clicking either the Publish or Skip button on the dialog causes the code in the feedDialogDone() function to execute, which refreshes the page and resets the controls on it to their default state
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Feed story submission dialog generated by the FacebookshowFeedDialog() function
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One of the great things about using JavaScript and the DOM is that it provides the ability to retrieve or set CSS styles dynamically using the DOM element s style property; however, this property is not available in FBJS FBJS replaces it with the getStyle() and setStyle() functions The getStyle() function can get the value of a specific CSS style on a DOM element It takes a string argument of the CSS style property and returns its value It has one major shortcoming It only returns inline styles set on an element, not ones applied through external <style> tagsThis, of course, is inconvenient because most HTML code these days uses external CSS applied in this mannerAlso, to use CSS style attributes that contain a dash in their names like font-size, text-align, or margin-top, for example you must convert them to camel-cased versions before passing them to either of these FBJS
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functions to ensure that they behave similarly on all browsersTo convert a dashed property name to camel case, simply remove the dash, capitalize the word after it, and combine the two words For example, text-align becomes textAlign If you run Listing 1117 in the FBML Test Console in WebKit-based browsers, such as Chrome or Safari, calling the getStyle() function with a dashed name works, while on Firefox and Internet Explorer, it does not On all four browsers, the camel-cased version works None of them work when querying for non-inline CSS styles
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Listing 1117 Using the FBJS getStyle() Function
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<style> foo {color:red;} </style> <div class='foo' style='text-align:center;font-weight:bold;' onclick='styleTests(this);return false;'>Click Me</div> <script> function styleTests(obj) { var dashed = "'" + objgetStyle('text-align')+ "'"; var camelCased = "'" + objgetStyle('fontWeight')+ "'"; var extCSSValue = "'" + objgetStyle('color') + "'"; // Google Chrome, Safari show: 'center' - 'bold' - '' // Firefox and IE show: 'undefined' - 'bold' - '' new Dialog()showMessage('FBJS getStyle() tests', dashed + ' - ' + camelCased + ' - ' + extCSSValue); } </script>
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The setStyle() function can set a single style on an element or multiple ones at a timeTo set multiple styles on an element, you need to incorporate them as properties of an FBJS object literal and pass that object to the setStyle() functionThe properties of this object are set to the names of the CSS styles to set; their values are set to strings containing the style informationWe use this to set multiple styles on an element in the next section, FBJS Animation The following code shows the various right and wrong ways to call setStyle()The most common mistakes developers make when using this function involve either not passing the second argument as a string or omitting the units ( px for example) when setting a dimensions of an element:
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elementsetStyle('fontWeight', 'bold'); // correct on all browsers elementsetStyle({fontWeight: 'bold'}); // correct on all browsers elementsetStyle('font-weight', 'bold'); // does not work on IE or Firefox elementsetStyle('fontWeight:bold'); // fails elementsetStyle('fontSize', 20); // fails, second argument must be string elementsetStyle('fontSize', '20'); // fails, need to append 'px' to the value
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