Dwr Javascript Error Handling
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of what's gone wrong. For example - if someone stops the app-server then DWR raises an error to say that it's got an HTTP error, or dwr javascript example if there is a JavaScript error in your callback function. A warningHandler is javascript error handling best practices used when something has broken, but we're not 100% sure that this isn't normal. For example, it is possible
Javascript Error Handling Library
with page transitions on Firefox to get an XHR callback after the XHR object has been killed. So XHR throwing an exception might be bad, or it might not depending on the
Javascript Error Handling Tutorial
circumstances. By default there is no warning handler, because unless things get hairy, you don't need to know about warnings. However sometimes it might be useful for debugging purposes. An exceptionHandler can be used to catch exceptions thrown by app-server code. If no exception handlers exist, the error handler is used. Exception handlers are new in 2.0. See below for more. There is also a javascript error handling patterns textHtmlHandler that allows you to manage what happens when a DWR request receives a response that isn't Javascript. This generally means that a server session has timed out, so it is usual in a textHtmlHandler to redirect to a login screen. The textHtmlHandler handler is new in 2.0. You set a global error handler like this: dwr.engine.setErrorHandler(handler); You can also specify call or batch level error or warning handlers. For example, in the call options object: Remote.method(params, { callback:function(data) { ... }, errorHandler:function(errorString, exception) { ... } }); or, in batch meta-data: dwr.engine.beginBatch(); Remote.method(params, function(data) { ... }); // Other remote calls dwr.engine.endBatch({ errorHandler:function(errorString, exception) { ... } }); Exceptions DWR can marshall exceptions, and they will become errors in JavaScript land (they can't be thrown since this will probably be happening asynchronously). For example, if we remote the following Java class: public class Remote { public String getData() { throw new NullPointerException("message"); } } Then in Javascript we will see the following: function errh(msg, exc) { alert("Error message is: " + msg + " - Error Details: " + dwr.util.toDescriptiveString(exc, 2)); } dwr.engine.setErrorHandler(errh); Remote.getData(function(data) { alert(data); }); The result w
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Javascript Error Handling Framework
Meta Discuss the workings and policies of this site About Us dwr callback function example Learn more about Stack Overflow the company Business Learn more about hiring developers or posting ads with dwr example in java us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just http://directwebremoting.org/dwr/documentation/browser/errors.html like you, helping each other. Join them; it only takes a minute: Sign up DRW errorHandler always returns “Error” as the error message instead of a real message up vote 0 down vote favorite FiltersManager.getAllServices({ callback : updateServiceFilter, errorHandler : function(message) { alert(message); } }); When an error occures, in the backend i am throwing an http://stackoverflow.com/questions/16592886/drw-errorhandler-always-returns-error-as-the-error-message-instead-of-a-real-m exception, but the error message always says "Error" when alerted Is there some setting I need to turn on? java javascript struts dwr share|improve this question asked May 16 '13 at 16:33 code511788465541441 6,07435104203 Did you set the handler first? "dwr.engine.setErrorHandler(handler);" –Asier Aranbarri May 16 '13 at 16:40 @AsierAranbarri no I haven't and when I tried just now there was a javascript error that "handler" was undefined –code511788465541441 May 16 '13 at 16:52 add a comment| 2 Answers 2 active oldest votes up vote 1 down vote Did you look at the second argument for DWR's errorHandler? errorHandler:function(errorString, exception) { console.log(exception); } share|improve this answer answered May 16 '13 at 16:39 epascarello 120k1393140 add a comment| up vote 0 down vote From DWR guide: When there is no exception converter specified for an exception, the exception object passed to the client looks like this: { javaClassName:'java.lang.Throwable', message:'Error' } You can enable a more verbose exception handler with the following in dwr.xml: Report Content as Inappropriate ♦ ♦ DWR EXCEPTION Handling It's now no setter fur http://dwr.2114559.n2.nabble.com/DWR-EXCEPTION-Handling-td5399333.html exception handling.we must do DWREngine._exceptionHandler = fctErrorDWRHandler;is that normal ? JoeWalker Reply | Threaded Open this post in threaded view ♦ ♦ | Report Content as Inappropriate ♦ ♦ Re: DWR EXCEPTION Handling On 11/17/06, David K <[hidden email]> wrote: It's now no setter fur exception handling.we must do DWREngine._exceptionHandler = fctErrorDWRHandler;is that javascript error normal ? No. All dwr.engine._* members are private. Their use may well break in the future.You set an exception handler like this:Remote.method(params, { callback:..., exceptionHandler:... });Exception handlers are specific to calls, just as try/catch is specific to where a call is made. If an exception happens without an exceptionHandler, then an error is javascript error handling raised. Joe. David K-3 Reply | Threaded Open this post in threaded view ♦ ♦ | Report Content as Inappropriate ♦ ♦ Re: DWR EXCEPTION Handling yes but i want that all exception will handler by my default function and not the DWR default exeption function2006/11/17, Joe Walker <[hidden email]>: On 11/17/06, David K <[hidden email]> wrote: It's now no setter fur exception handling.we must do DWREngine._exceptionHandler = fctErrorDWRHandler;is that normal ? No. All dwr.engine._* members are private. Their use may well break in the future.You set an exception handler like this:Remote.method(params, { callback:..., exceptionHandler:... });Exception handlers are specific to calls, just as try/catch is specific to where a call is made. If an exception happens without an exceptionHandler, then an error is raised. Joe. David K-3 Reply | Threaded Open this post in threaded view ♦ ♦ | Report Content as Inappropriate ♦ ♦ Re: DWR EXCEPTION Handling you can not make that so as dwr.engine.setExceptionHandle