An Error Message Is Thrown
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A Cobalt Error Was Thrown
Developer ToolsFeedback Get Firefox help Get web development help Join the MDN community a cobalt error was thrown sharepoint Report a content problem Report a bug Search Search Languages Català (ca) Deutsch (de) Español (es) Français (fr) 日本語 ajax error thrown (ja) Polski (pl) 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 Statements and declarations throw
Java Throw Error Message
Your Search Results fscholz ptepper nacyot GuilhermeReda rxgx Dan-Dascalescu Havvy Ginden Sheppy tregagnon safjanowski Shiningtiti Mgjbot Ptak82 Maian Anonymous Dria throw In This Article SyntaxDescriptionExamplesThrow an objectAnother example of throwing an objectRethrow an exceptionSpecificationsBrowser compatibilitySee also The throw statement throws a user-defined exception. Execution of the current function will stop (the statements after throw won't be executed), and control will be passed to the first catch block
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in the call stack. If no catch block exists among caller functions, the program will terminate. Syntax throw expression; expression The expression to throw. Description Use the throw statement to throw an exception. When you throw an exception, expression specifies the value of the exception. Each of the following throws an exception: throw "Error2"; // generates an exception with a string value throw 42; // generates an exception with the value 42 throw true; // generates an exception with the value true Also note that the throw statement is affected by automatic semicolon insertion (ASI) as no line terminator between the throw keyword and the expression is allowed. Examples Throw an object You can specify an object when you throw an exception. You can then reference the object's properties in the catch block. The following example creates an object of type UserException and uses it in a throw statement. function UserException(message) { this.message = message; this.name = "UserException"; } function getMonthName(mo) { mo = mo-1; // Adjust month number for array index (1=Jan, 12=Dec) var months = ["Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"]; if (months[mo] !== undefined) { return months[mo]; } else { thr
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Javascript Throw New Error
Tutorials References Developer Guides Accessibility Game development ...more docs Mozilla Docs Add-ons Firefox throw error java WebExtensions Developer ToolsFeedback Get Firefox help Get web development help Join the MDN community Report a content problem Report a bug Search https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/throw Search Languages Català (ca) Deutsch (de) Español (es) Français (fr) Bahasa Indonesia (id) 日本語 (ja) 한국어 (ko) Polski (pl) Português (do Brasil) (pt-BR) Русский (ru) 中文 (简体) (zh-CN) 正體中文 (繁體) (zh-TW) Add a translation Edit Advanced Advanced History Print this article MDN Web technology https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Error For developers JavaScript JavaScript reference Standard built-in objects Error Your Search Results ariyankhan josephmcasey AlexanderFradiani fscholz mondwan SphinxKnight janosch-x davidchase Mingun shawnacscott Sheppy ethertank Nickolay evilpie trevorh teoli davidbourguignon secoif DomenicDenicola dgchurchill timemachine3030 Sevenspade Potappo Sephr Brettz9 Mgjbot Allanbonadio Ptak82 JustinLudwig Error In This Article SyntaxParametersDescriptionError typesPropertiesMethodsError instancesPropertiesStandard propertiesVendor-specific extensionsMicrosoftMozillaMethodsExamplesThrowing a generic errorHandling a specific errorCustom Error TypesSpecificationsBrowser compatibilitySee also The Error constructor creates an error object. Instances of Error objects are thrown when runtime errors occur. The Error object can also be used as a base object for user-defined exceptions. See below for standard built-in error types. Syntax new Error([message[, fileName[, lineNumber]]]) Parameters message Optional. Human-readable description of the error. fileName Optional. The value for the fileName property on the created Error object. Defaults to the name of the f
As promised, we're going to take a closer look at the Error object that gets passed into the catch clause to see just what http://www.javascriptkit.com/javatutors/trycatch2.shtml we can extract from it in an event of an error. The Error object in all browsers support the following two properties: name: The name of the error, or more specifically, the name of the constructor function the error belongs to. message: A description of the error, with this description varying depending on the browser. try{ document.body.filters[0].apply() error message } catch(e){ alert(e.name + "\n" + e.message) } Demo: Six possible values can be returned by the name property, which as mentioned correspond to the names of the error's constructors. They are: Error Name Description EvalError An error in the eval() function has occurred. RangeError Out of range number value has occurred. ReferenceError An illegal reference has occurred. throw error message SyntaxError A syntax error within code inside the eval() function has occurred. All other syntax errors are not caught by try/catch/finally, and will trigger the default browser error message associated with the error. To catch actual syntax errors, you may use the onerror event. TypeError An error in the expected variable type has occurred. URIError An error when encoding or decoding the URI has occurred (ie: when calling encodeURI()). This level of detail may be useful when you wish to sniff out a specific type of error in your catch clause. In the below, no DIV on the page exists with ID="mydiv". When trying to set its .innerHTML property, a TypeError occurs, since we're trying to assign the .innerHTML property to a null object: try{ document.getElementById("mydiv").innerHTML='Success' //assuming "mydiv" is undefined } catch(e){ if (e.name.toString() == "TypeError"){ //evals to true in this case //do something } } Ok, so maybe it's not that useful most of the time, but you just never know. Throwing your own errors (exceptions) Instead of waiting