Break On Error
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helping each other. Join them; it only takes a minute: Sign up How to get Chrome debugger to break or error when working on undefined variables up vote 5 down vote favorite 1 My Javascript code (hundreds of
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lines) hangs Chrome and when I debug the issue I find out that a variable was undefined. I don't get errors in the console. So this is making my debugging more time consuming because there are no errors or exceptions or anything that tells me where the issue is. I don't want to add debugging code. Is there a way to make the debugger put out an error, break in the debugger or give an exception or breakpoint error show anything useful for the developer when hitting an undefined variable during runtime? It doesn't have to be for Chrome only. javascript google-chrome-devtools javascript-debugger share|improve this question asked Oct 10 '13 at 21:38 Tony_Henrich 11.7k42151272 add a comment| 2 Answers 2 active oldest votes up vote 7 down vote You can break into the DevTools debugger when a JavaScript error occurs using the Pause on JavaScript Exceptions feature. It has two active modes; pause on all exceptions, and pause on uncaught exceptions. Based on the description of your experience, the application you are working on may have errors that are caught but not re-thrown or logged. Using the "Pause on All Exceptions" (blue colored pause icon), will help in this scenario. Note: some libraries, like jQuery, catch exceptions and do not re-throw them. If you have this experience, you may need to advance past these exceptions or set the "Pause on All Exceptions" feature after all dependencies have loaded. share|improve this answer edited Oct 10 '13 at 22:24 answered Oct 10 '13 at 22:16 Ethan Selzer 1,492810 add a comment| up vote 2 down vote window.onerror = function() { debugger; } share|improve this answer answered Oct 14 '13 at 17:13 dolphone bubleine 544419 add a comment| Your Answer draft saved draft discarded Sign up or log in Sign up using Google Sign up using Facebook S
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Line ShortcutsSetup Browser ExtensionsSetup Your Build ToolsChrome DevToolsOverviewConfigure and Customize DevToolsDebug Progressive Web AppsUnderstand https://developers.google.com/web/tools/chrome-devtools/debug/console/track-exceptions?hl=en Security IssuesInspect and Edit Pages and StylesOverviewEdit StylesInspect AnimationsEdit https://getfirebug.com/doc/breakpoints/demo.html the DOMKeyboard and UI Shortcuts ReferenceInspect and Manage Storage, Caches, and ResourcesInspect and Manage Storage, Databases, and CachesInspect and Delete CookiesInspect ResourcesSimulate Mobile Devices with Device ModeOverviewTest Responsive and Device-Specific ViewportsEmulate Geolocation and Accelerometer SensorsEmulate and on error Test Other BrowsersRemote Debugging Android DevicesOverviewAccess Local ServersRemote Debugging WebViewsInspect and Debug JavaScriptSet BreakpointsStep Through CodeRun Snippets of Code From Any PagePretty-Print Minified JavaScriptWatch Variables in SourcesMap Preprocessed Code to Source CodeUsing the ConsoleOverviewDiagnose and Log to the ConsoleCompare Similar Data ObjectsMeasure and Count ExecutionsHandle Exceptions break on error and ErrorsConsole API ReferenceEvaluate ExpressionsMonitor EventsCommand Line ReferenceHow to Look at PerformanceHow to Use the Timeline ToolTimeline Event ReferenceAnalyze Runtime PerformanceOverviewSpeed Up JavaScript ExecutionDiagnose Forced Synchronous LayoutsMeasure Network PerformanceMeasure Resource Loading TimesUnderstand Resource TimingOptimize Performance Under Varying Network ConditionsFix Memory ProblemsOverviewUnderstand Memory TerminologyRecord Heap SnapshotsUse the Allocation ProfilerExtend the Chrome DevToolsIntegrating with DevTools and ChromeDevTools Extensions APIDebugger ProtocolLighthouseOverviewAudit ReferencesCache Contains start_url From ManifestURL Responds with a 200 When OfflineSite Redirects HTTP Traffic to HTTPSSite is on HTTPSPage Contains Some Content When Its Scripts Are Not AvailableHas a Registered Service WorkerService Worker LibrariesWeb Starter KitPolymer Starter Kit Getting StartedOverviewSetup Your EditorSetup Persistence with DevTools WorkspacesSetup CSS & JS PreprocessorsSetup Command Line ShortcutsSetup Browser ExtensionsSetup Your Build ToolsChrome DevToolsOverviewConfigure and Customize DevToolsDebug Progressive Web AppsUnderstand Security IssuesInspect and Edit Pages and StylesOverviewEdit StylesInspect AnimationsEdit the DOMKeyboa
feature of debuggers Find the line of source you want to investigate Set a breakpoint Run the program Debugger halts execution, you poke around Why Setting Breakpoints On Source Does Not Always Work Large programs: you forget which line of code does what Frameworks: your code is lost in a sea of other code Multi-developer: your code and 26 other folks too User-Interface Oriented Breakpoints Solution: Breakpoint first then see the line of code Break on UI events: modication, activations, errors "Recognize (browse)" rather then "Recall (search)" Contribution: implementation of many UI event breakpoints in a production debugger Demos To run the demos: Open Firefox 3.5 or newer Install Firebug 1.5 or newer Reload this page Follow the instructions below for each kind of breakpoint Individual Demos: Breakpoints in Dynamic Javascript via eval() Break on Next Javascript Call Breakpoints on Errors Breakpoints on Network Events Breakpoints on DOM (HTML) Mutation Events Breakpoints on DOM Property Changes Breakpoints on CSS Style Rule Changes Breakpoints on Event Handlers Breakpoints support for Extensions Breakpoints in Dynamic Javascript via eval() Dynamic Javascript with User Supplied Filename If you are stopped in the debugger, either click the blue continue button or reload the page Load the duck and cat functions by AJAX Load Animals Open the Firebug Script Panel and select "payloadCatsAndDucks.js", then set a breakpoint on line 10 Call the Duck and Cat functions Prod Animals You should halt in the debugger on a breakpoint in dynamically created source code Note the special comment at the end of the source. This comment is parsed by Firebug to set the file name. Dynamic Javascript with Generated Filename If you are stopped in the debugger, either click the blue continue button or reload the page Load the duck and cat functions by AJAX Load Anonymous Animals Open the Firebug Script Panel and select "payloadCatsAndDucks.js", then set a breakpoint on line 10 Call the Duck and Cat functions Prod Anonymous Animals You should halt in the debugger on a breakpoint in dynamically created source code In this case the user code did not give a file name, so Firebug created one by computing an MD5 hash of