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Using a proxy is practically the same Do not forget to URLencode() the data to be passed to the proxy
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void sendCitiesToServerViaProxy(String xmlToSend) { final + final final final String baseUrl = "http:" GWTgetHostPageBaseURL()split(":")[1]; String realUrl = URLencode(baseUrl); String realPath = URLencode("bookphp/setcitiesphp"); String params = URLencode("xmldata=" + xmlToSend);
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XhrProxyAsync xhrProxy = getEnvironment()getModel() getRemoteXhrProxy(); xhrProxypostToUrl(realUrl, realPath, params, new AsyncCallback<String>() { @Override public void onFailure(Throwable caught) { //warn about the problem } @Override public void onSuccess(String result) { //let the user know the data were processed } }); }
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After the XML is processed, further steps would be the same as with the
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RequestBuilder previous call
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We have seen how to process and generate XML code, and also studied how to get it from a server either by using XMLHttpRequest calls or by having an intermediate proxy, called by RPC We return to XML processing in the next chapters, when we will build an RSS/ Atom feed reader; we ll be getting the feeds either via JSONP ( 8, Mixing in JavaScript ) or through external APIs ( 9, Adding APIs ), but the XML processing will be along the same lines we saw in this chapter
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Mixing in JavaScript
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JavaScriptcareful,GWT what assembly with your isJava code can help Forand although you is to language to classic compilers, should be mixing JavaScript in example, you can
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attain better performance, or achieve otherwise hard-to-get results, including getting data from remote servers bypassing the Same Origin Policy we covered in previous chapters There are some circumstances when you will need to add some JavaScript to your application, and GWT provides a solution for this kind of situation The GWT developers frequently use this to get low-level access to browser aspects, but there are other possible usages, such as taking advantage of prewritten JavaScript routines and libraries, using JSON (an alternative to XML) for connection with servers, or using JSONP as a way to avoid cross scripting SOP restrictions; we ll analyze examples of all these situations in this chapter
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JavaScript Native Interface (JSNI) enables you to include JavaScript written routines within your GWT Java program Your JavaScript code will fully interact (ie, calling, or being called by) with the Java code, passing data back and forth, and even processing exceptions thrown by each other In fact, you could think of JavaScript as the assembly language for GWT applications and use it the same way you would use Intel assembly code with C++, for example (As an example of this, several History methods that we used in 4, Working with Browsers, are actually programmed directly in JavaScript) Before going any further, some warnings need be given in advance First, it should be obvious that by programming directly with JavaScript, you are foregoing GWT s advantages as to browser independence; for example, if your code deals with DOM aspects, you will have to take care of compatibility by yourself (Deferred binding which we saw in 4 is often used along with JSNI to produce browser-specific versions of classes; GWT does this all the time) Memory leaks and hard to trace errors are also a possibility, and, of course, as we commented in 1, Developing Your Application, JavaScript isn t so good from the software engineering point of view as Java itself; wasn t
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that a reason for using GWT But, if you still decide to go ahead, JSNI will enable you to access low-level operations or reuse third-party libraries, and possibly even squeeze a drop more of speed and performance for your application1 Other observation that needs be done is that JavaScript code will be harder to write (neither the Java compiler nor GWT will detect syntactic or semantic problems in your JavaScript code), debug (your Eclipse debugger won t be much help when debugging non-Java code) and test (you won t be able so easily mock classes that mix JavaScript and Java) so before going this way, you should certainly question yourself to see if pure GWT Java code isn t capable or good enough for your purposes In any case, we shall see more JSNI; for example, in 9, Adding APIs, we use it to access third-party services (think Google Maps for a simple case) through specific JavaScript APIs