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Evenstill generating browser-independent code is one of GWT s main selling points, go if there remain some details you need to be aware of hopefully without having to
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all the way to producing browser-specific code! First, you need to pay special attention in case the user wants to go back to a previous screen by using the Alt+Backspace combo or the Back button in his browser Because GWT applications run in a single screen, that action will probably log the user out of your program Then, in some cases (such as deciding whether to show a video by using HTML 5 s tags) you might need to be aware of the specific version of the user browser; we ll see two solutions for that, a classic one you surely already know, and a better GWT-specific one taking advantage of deferred binding Deferred binding will also pave the way for automatic code generation, which we shall use to automate the production of part of our application And, finally, you might need to deal with old browsers (yes, there still are IE 5 browsers around) and users who have disabled JavaScript all of which are certain showstoppers for GWT applications So, in this chapter we will mainly deal with these kind of browser details you always must take care of, and, as a welcome side effect, bring into being a general launcher infrastructure that can help building menus and linking parts of your application, and see some more about deferred binding and the inner workings of the GWT compiler
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GWT applications (as most other Ajax-based applications, too) usually run in a single page, which is dynamically created and regenerated as needed This mode of work creates the Back Button or Alt+Backspace problem: If the user tries to go back to a previous screen in your application, results will be unexpected Instead of going back as desired, he will get kicked out of your application, landing in whichever page he had been before visiting yours Of course, the user cannot expect that your application won t behave like any other web application, so this behavior would be, to say the least, aggravating You
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have no way of inhibiting the Alt+Backspace combo and the browser s own Back command, but fortunately GWT provides a simple way out, with the History class It should be noted that at the 2009 Google I/O conference, the first point in Ray Ryan s GWT App Architecture Best Practices was Get browser history right, and get it right early 1 The rationale for this is that you will find it far easier to get it right at the beginning than to retrofit at a later point So, let s get into this right now, before starting to develop any other code; what we shall see here will be complemented by the MVP pattern discussion in the next chapter
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The History class is GWT s answer to the Alt+Backspace problem It enables you to easily deal with Back and Forward commands, in a way that will be totally transparent to the user However, before starting with the actual details of this class, let s add some required code to your basic HTML page Within its <body> add the following script:
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<iframe src="javascript:''" id="__gwt_historyFrame" tabIndex='-1' style="position: absolute; width: 0; height: 0; border: 0"> </iframe>
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Be careful with the double underscore at the beginning of __gwt_historyFrame If you try using the History class without having included the preceding code, when running in Development mode, you get the following warning in the log:
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Unable to initialize the history subsystem; did you include the history frame in your host page Try <iframe src=\"javascript:''\" id='__gwt_historyFrame' style='position:absolute; width:0; height:0; border:0'></iframe>
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Note, however, that this message will only appear if you use Internet Explorer 6 and 7 browsers, which lack the necessary onhashchange event2 (Of course, you might opt for another solution, and kick the user out if his browser isn t adequate We will see ways to do this later in this chapter, but it certainly wouldn t be too friendly!) Other browsers, such as Firefox or Safari, can run even without this script The latest Internet Explorer 8 added support for this event with its Ajax Navigations feature3
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1 Check http://codegooglecom/events/io/2009/sessions/GoogleWebToolkitBestPracticeshtml for the conference video and presentation 2 And neither does Internet Explorer 8, when in Compatibility mode; see wwwmicrosoftcom/ windows/internet-explorer/features/easieraspx for a description of this mode 3 Read http://msdnmicrosoftcom/en-us/library/cc891506(VS85)aspx for more on this
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