Eval Error Handling Javascript

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Javascript Eval Catch Error

Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a javascript eval error line number community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up eval javascript, check for syntax error up vote 22 down vote favorite 4 I wanted

Error Handling In Javascript Best Practices

to know if it is possible to find through javascript if a call to eval() has a syntax error or undefined variable, etc... so lets say I use eval for some arbitrary javascript is there a way to capture the error output of that eval? javascript eval share|improve this question asked Feb 7 '11 at 15:51 Jesus Ramos 18.1k53971 add a comment| 4 Answers 4 active oldest votes up vote 32 ajax error handling javascript down vote accepted You can test to see if an error is indeed a SyntaxError. try { eval(code); } catch (e) { if (e instanceof SyntaxError) { alert(e.message); } } share|improve this answer answered Feb 7 '11 at 15:56 ChaosPandion 50.5k884126 I'm wondering why I didn't try this myself. Thanks a lot! –Jesus Ramos Feb 7 '11 at 16:37 2 @Jesus - The fact that you're wondering is a good thing. Anyway, good luck. –ChaosPandion Feb 7 '11 at 18:00 add a comment| up vote 7 down vote When using try catch for catching particular type of error one should ensure that other types of exceptions are not supressed. Otherwise if evaluated code would throw a different kind of exception it could disappear and cause unexpected behavior of code. I would suggest writting code like this: try { eval(code); } catch (e) { if (e instanceof SyntaxError) { alert(e.message); } else { throw( e ); } } Please note the "else" section. share|improve this answer answered Oct 13 '14 at 19:01 RandomX 7111 add a comment| up vote 2 down vote According to the Mozilla documentation for eval: eval returns the value of the last expression evaluated. So I think you may be out of luck. Th

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Javascript Exception Object

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Javascript Catch Typeerror

Search Languages Español (es) Français (fr) 日本語 (ja) 한국어 (ko) Português (do Brasil) (pt-BR) 中文 (简体) (zh-CN) Add a translation eval alternative javascript Edit Advanced Advanced History Print this article MDN Web technology For developers JavaScript JavaScript reference Statements and declarations try...catch Your Search Results samuele-artuso Markus Prokott fscholz valango SphinxKnight themitchy madarche Protron Noitidart http://stackoverflow.com/questions/4923316/eval-javascript-check-for-syntax-error Delapouite Havvy dezzadk indolering Sheppy trevorh Niggler secoif Dietrich Mgjbot Nanto vi Ptak82 Maian Nickolay Dria try...catch In This Article SyntaxDescriptionUnconditional catch clauseConditional catch clausesThe exception identifierThe finally clauseExamplesNested try-blocksReturning from a finally blockSpecificationsBrowser compatibilitySee also The try...catch statement marks a block of statements to try, and specifies a response, should an exception be thrown. Syntax try { try_statements } [catch (exception_var_1 if condition_1) { // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/try...catch non-standard catch_statements_1 }] ... [catch (exception_var_2) { catch_statements_2 }] [finally { finally_statements }] try_statements The statements to be executed. catch_statements_1, catch_statements_2 Statements that are executed if an exception is thrown in the try block. exception_var_1, exception_var_2 An identifier to hold an exception object for the associated catch clause. condition_1 A conditional expression. finally_statements Statements that are executed after the try statement completes. These statements execute regardless of whether or not an exception was thrown or caught. Description The try statement consists of a try block, which contains one or more statements ({} must always be used, also for single statements), and at least one catch clause or a finally clause, or both. That is, there are three forms of the try statement: try...catch try...finally try...catch...finally A catch clause contain statements that specify what to do if an exception is thrown in the try block. That is, you want the try block to succeed, and if it does not succeed, you want control to pass to the catch block. If any statement within the try block (or in a function called from within the try block) throws an exception, control immediately shifts to the ca

& Guides Learn the Web Tutorials References Developer Guides https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/EvalError Accessibility Game development ...more docs Mozilla Docs Add-ons Firefox WebExtensions Developer ToolsFeedback Get Firefox help Get web development help Join the MDN community Report http://www.w3schools.com/jsref/jsref_try_catch.asp a content problem Report a bug Search Search Languages Català (ca) Français (fr) 日本語 (ja) Português (do Brasil) (pt-BR) Русский (ru) 中文 (简体) error handling (zh-CN) Add a translation Edit Advanced Advanced History Print this article MDN Web technology For developers JavaScript JavaScript reference Standard built-in objects EvalError Your Search Results fscholz AlexanderFradiani Mingun arai Sheppy ethertank jswisher Sevenspade Potappo EvalError In This Article SyntaxParametersPropertiesMethodsEvalError instancesPropertiesMethodsExamplesCreating an EvalErrorSpecificationsBrowser compatibilitySee also The EvalError eval error handling object indicates an error regarding the global eval() function. This exception is not thrown by JavaScript anymore, however the EvalError object remains for compatibility. Syntax new EvalError([message[, fileName[, lineNumber]]]) Parameters message Optional. Human-readable description of the error fileName Optional. The name of the file containing the code that caused the exception lineNumber Optional. The line number of the code that caused the exception Properties EvalError.prototype Allows the addition of properties to an EvalError object. Methods The global EvalError contains no methods of its own, however, it does inherit some methods through the prototype chain. EvalError instances Properties EvalError.prototype.constructor Specifies the function that created an instance's prototype. EvalError.prototype.message Error message. Although ECMA-262 specifies that EvalError should provide its own message property, in SpiderMonkey, it inherits Error.prototype.message. EvalError.prototype.name Error name. Inherited from Error. EvalError.prototype.fileName Path to file that raised this error. I

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