Java Script Syntax Error Message
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Page Redirect Javascript - Dialog Boxes Javascript - Void Keyword Javascript - Page Printing JavaScript Objects Javascript - Objects Javascript - Number Javascript - Boolean Javascript http://www.w3schools.com/js/js_errors.asp - Strings Javascript - Arrays Javascript - Date Javascript - Math Javascript - RegExp Javascript - HTML DOM JavaScript Advanced Javascript - Error Handling Javascript - Validations Javascript - Animation Javascript - Multimedia Javascript - Debugging Javascript - Image Map Javascript - Browsers IMS DB Resources Javascript - Questions And Answers Javascript https://www.tutorialspoint.com/javascript/javascript_error_handling.htm - Quick Guide Javascript - Functions Javascript - Resources Selected Reading Developer's Best Practices Questions and Answers Effective Resume Writing HR Interview Questions Computer Glossary Who is Who JavaScript - Errors & Exceptions Handling Advertisements Previous Page Next Page There are three types of errors in programming: (a) Syntax Errors, (b) Runtime Errors, and (c) Logical Errors. Syntax Errors Syntax errors, also called parsing errors, occur at compile time in traditional programming languages and at interpret time in JavaScript. For example, the following line causes a syntax error because it is missing a closing parenthesis. When a syntax error occurs in JavaScript, only the code contained within the same thread as the syntax error is affected and the rest of the code in other threads gets executed assuming nothing in them depends on the code containing the error. Runtime Errors Runtime errors, also called exceptions, occ
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 we can extract from it in http://www.javascriptkit.com/javatutors/trycatch2.shtml an event of an error. The Error object in all browsers support http://www.htmlgoodies.com/html5/javascript/handling-javascript-errors-by-type.html 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() } catch(e){ alert(e.name + "\n" + e.message) } Demo: Six possible values syntax error 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. SyntaxError A syntax error within code inside the eval() function has occurred. All other syntax errors are not java script syntax 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 for one of the 6 types of errors above to occur before control is automatically transferred from the try block to the catch block, you can also explicitly throw your own exceptions to force that to happen
- sql HTML & Graphics Tutorials getting started backgrounds buttons browser specific colors forms frames html 4.01 tags html 4.01 ref image maps tables web graphics Beyond HTML asp cascading style sheets css keyword ref cgi scripting developer research center dhtml/layers dot net java applets javascript javascript frameworks javascript keyword ref javascript script tips mobile web development open source cms php security SEO vb script keyword ref webmaster tips webmaster projects webmaster toolbox video xml general reference pieces the master list Need Help? discussion boards mentors HTML Goodies : HTML5 : HTML5 and JavaScript Post a comment Email Article Print Article Share Articles Reddit Facebook Twitter del.icio.us Digg Slashdot DZone StumbleUpon FriendFeed Furl Newsvine Google LinkedIn MySpace Technorati YahooBuzz Handling JavaScript Errors by Type By Rob Gravelle Tweet There are four major error types in programming: compile errors, logic errors, input/validation errors, and runtime errors. Error catching in code is usually limited to the latter two types. It would be nice if you could handle your own logic errors at runtime, but sadly, there is no such code construct yet. As for syntax errors, an interpreted language like JavaScript won't catch those until the script is loaded into and read by the browser. While you normally can't catch syntax errors, as we'll see shortly, there are times that you can. Today's article will discuss the syntax error, along with two other error types, while the next installment will cover the remaining three. The Six JavaScript Error Types The JavaScript 1.5 specification defines six primary error types, as follows: EvalError: Raised when the eval() functions is used in an incorrect manner. RangeError: Raised when a numeric variable exceeds its allowed range. ReferenceError: Raised when an invalid reference is used. SyntaxError: Raised when a syntax error occurs while parsing JavaScript code. TypeError: Raised when the type of a variable is not as expected. URIError: Raised when the encodeURI() or decodeURI() functions are used in an incorrect manner. The Error.name Property The benefit of having all the different error types is that you can pinpoint more accurately what kind of error you're dealing with. This is done using the Error.name property because JavaScript's loose typing doesn't support specifying which type you want to catch as you would in Java: catch(ArrayIndexOutOfBoundsException e) {} In JavaScript, you have to use an if statement within a single "c