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An (even better from the point of view of packaging everything together) alternative would be adding <script src="/md5-minjs"/> to your gwtxml module declaration file, as we saw in 3, Understanding Projects and Development ; in both cases, you can be assured that your code won t be called until the script is loaded The script itself should be placed in the war directory of your project6 Given this, calculating the MD5 hash for any string can be done by just writing md5("your string") if you declare7
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private static native String md5(String pText) /*-{ return $wndhex_md5(pText); }-*/;
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Note particularly the usage of $wnd (which points to the current page s browser window) to access the hex_md5() method; because your GWT compiled code executes in a frame, you wouldn t get access to the window methods and variables (Forgetting to use $wnd is a quite common error; remind me to tell you how I know!) Similarly, you would use $doc (which points to the current page s document object) to get at the current document properties
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5 For example, you can find MD5 implementations at http://wwwwebtoolkitinfo/javascript-md5html and http://pajhomeorguk/crypt/md5/ and by searching a bit, you can find several more 6 Previous versions of GWT used a public directory for this 7 Note that the /*-{}-*/ notation is actually a comment; in Java (not GWT) native methods are pure object code, and you aren t allowed to specify a code block for them With JSNI, you include your JavaScript within a comment that will be ignored by Java but recognized and processed by the GWT compiler
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Analogously, you could use other cryptographic methods for encoding or decoding, for example; just make sure your JavaScript implementation is well tested, even taking into account possible changes such as the previous usage of $wnd8
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Although GWT does provide some help as to animations (see the comgooglegwt animationclientAnimation for more on this) there are many well-tested and efficient libraries, such as jQuery (at http://jquerycom/) or scriptaculous (at http://scriptaculous/) that provide all kinds of animations, transitions, and effects Let s go with jQuery, and use it for a simple embellishment to highlight hyperlinks as you hover over them First, you ll have to add the appropriate jQuery library to your HTML file, with <script type="text/javascript" language="javascript" src="jquery-132minjs"></script> Then, we can write a JSNI animateAllLinks() function that will get all links on the current window ($('a') is a selector, the jQuery way of referring to all <a> links, and we already saw the need for $wnd) and make them grow to 150% size when the mouse goes over them, and reduce them back to normal size when the mouse moves out (Yes, I know that the effect isn t that pretty, but on the other hand, it s simple to code!) The stop() method cancels any previous animation enabling a new one to proceed The code is then
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private static native void animateAllLinks() /*-{ $wnd$('a')hover( function() { // mouse in animation code $wnd$(this)stop()animate({fontSize:'150%'}, 250); }, function() { // mouse out animation code $wnd$(this)stop()animate({fontSize:'100%'}, 250); }); }-*/;
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If you call the animateAllLinks() function, jQuery will add the two animations to every <a> link it can find Of course, you can do much better, by both doing animations and CSS styling, but that would be beyond this book; we just want to see how to use an external JavaScript library, and JSNI enabled us to do it quite simply
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Do you remember Nixie tubes The earliest calculators (in the 70s before LED times) used them for displays Basically, those tubes included several numeral-shaped cathodes,
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8 If you want to test any implementation, there are many test suites such as the one at http://homeclaranetde/xyzzy/src/md5cmd that you can use
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