Eval Syntax Error Javascript
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here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site eval syntax error at line 1 (' unexpected About Us Learn more about Stack Overflow the company Business Learn more eval syntax error python about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss syntax error at eval 1 line 1 near Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up eval javascript, check find syntax error in javascript for syntax error up vote 22 down vote favorite 4 I wanted 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
Find Syntax Error In Javascript Online
'11 at 15:51 Jesus Ramos 18.1k53971 add a comment| 4 Answers 4 active oldest votes up vote 32 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
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Uncaught Syntax Error Javascript
web development help Join the MDN community Report a content problem Report javascript eval catch error a bug Search Search Languages Deutsch (de) Español (es) Français (fr) Italiano (it) 日本語 (ja) 한국어 (ko) Português javascript eval function (do Brasil) (pt-BR) Русский (ru) 中文 (简体) (zh-CN) Add a translation Edit Advanced Advanced History Print this article MDN Web technology For developers JavaScript JavaScript reference Standard built-in objects eval() Your Search http://stackoverflow.com/questions/4923316/eval-javascript-check-for-syntax-error Results Sebastianz SphinxKnight jasonnian1978 eduardoboucas AWESOMEJ fscholz x2357 linclark tjcrowder JohnsonCheungHK06 kertof derelbenkoenig Delapouite oluc Robg1 jswisher cm_rocanroll briankuhn Sheppy Ruakh ethertank trevorh evilpie bradleymeck Nickolay Potappo jorh paul.irish ignisvulpis Tetrix Laser Sevenspade Varmaa Fdrake1 Mgjbot Marcoos Kris.kowal Ptak82 Ahmed Masud Maian Dria eval() In This Article SyntaxParametersReturn valueDescriptionDon't use eval needlessly!Accessing member propertiesUse functions instead of evaluating snippets of codeParsing JSON (converting https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/eval strings to JavaScript objects)Pass data instead of codeRun code with limited privilegesExamplesUsing evalUsing eval to evaluate a string of JavaScript statementsLast expression is evaluatedeval as a string defining function requires "(" and ")" as prefix and suffixSpecificationsBrowser compatibilityGecko-specific notesSee also The eval() function evaluates JavaScript code represented as a string. Syntax eval(string) Parameters string A string representing a JavaScript expression, statement, or sequence of statements. The expression can include variables and properties of existing objects. Return value A string representing the completion value of evaluating the given code. If the completion value is empty, undefined is returned. Description eval() is a function property of the global object. The argument of the eval() function is a string. If the string represents an expression, eval() evaluates the expression. If the argument represents one or more JavaScript statements, eval() evaluates the statements. Do not call eval() to evaluate an arithmetic expression; JavaScript evaluates arithmetic expressions automatically. If you construct an arithmetic expression as a string, you can use eval() to evaluate it at a later time. For example, suppose you have a variable x. You can postpone evaluation of
& Guides Learn the Web Tutorials References Developer Guides Accessibility Game development ...more docs Mozilla Docs Add-ons Firefox WebExtensions Developer https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/EvalError ToolsFeedback Get Firefox help Get web development help Join the MDN community Report 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) (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 syntax error Your Search Results fscholz AlexanderFradiani Mingun arai Sheppy ethertank jswisher Sevenspade Potappo EvalError In This Article SyntaxParametersPropertiesMethodsEvalError instancesPropertiesMethodsExamplesCreating an EvalErrorSpecificationsBrowser compatibilitySee also The EvalError 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 eval syntax error 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. Inherited from Error. EvalError.prototype.lineNumber Line number in file that raised this error. Inherited from Error. EvalError.prototype.columnNumber Column number in line that raised this error. Inherited from Error. EvalError.prototype.stack Stack trace. Inherited from Error. Methods Although the EvalError prototype object does not contain any methods of its own, EvalError instances do inherit some methods through the prototype chain. Examples EvalError is not used in the current ECMAScript specification and will