JSON-RPC - Custom Training Courses - Coreservlets.com

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Synchronous RPC Calls21• Idea– Make normal function call• var result = rpcClient.serverObj.methodOfServerObj(…);• Arguments to method and return value– You can pass numbers, strings, arrays, or objects.– You do not need to escape Strings you pass to server– Beans that are returned from server are automaticallyJSONified as in previous lecture– Passing objects to server is trickier (but not done often).Server-side sdecode should expect JSONObject.• Important: use asynchronous calls– Synchronous calls are only for practice and testing of theserver-side side code.– Always use asynchronous calls in real life, otherwiseJavaScript will be frozen until server returns.Synchronous Calls: Example ofInteractive Testing22First, deploy app and start server. Bring up a page that loads both jabsorb.js and a JavaScript file that does basic client-side setup as justdescribed. Then bring up Firebug and interactively try out remote method calls. To add a new remote method, just add a method to the class inEclipse and save file. Then R-click on server and choose “Restart”. Then go to HTML page and hit reload button. Then go back to Firebug andtry the new method.
Synchronous Call: Example(JavaScript)function showRandomNumber1(resultRegion) {var randomNumber =rpcClient.rpcTester.getRandomNumber();htmlInsert(resultRegion,"Number is " + randomNumber);}23Synchronous Call: Example(HTML)text/javascript …Synchronous Server Call24
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Page 15: © 2010 Marty HallPassing or Return
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JSON-RPC - Custom Training Courses - Coreservlets.com

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