For example, in a Vue.js app, the minified script gets passed as a string to an eval statement, and there's no way to step through this code effectively using the Visual Studio debugger unless you use source maps. However, you may only be able to set and hit breakpoints in the minified or transpiled file, not in the source file. You can even attach the debugger to a running client-side script without the source maps. If your source is minified or created by a transpiler like a TypeScript or Babel, use source maps for the best debugging experience. JavaScript code must be in separate files to enable debugging. For debugging TypeScript in ASP.NET Core, see Create an ASP.NET Core app with TypeScript.įor Node.js applications and other JavaScript projects, follow the steps described here.įor ASP.NET and ASP.NET Core, debugging embedded scripts in. In some scenarios, the debugger automatically hits breakpoints in JavaScript and TypeScript codes and embedded scripts on HTML files.įor debugging client-side script in ASP.NET apps, choose Tools > Options > Debugging, and then select Enable JavaScript Debugging for ASP.NET (Chrome, Edge, and IE).įor more detailed information, see the blog post Debug JavaScript in Microsoft Edge and this post for Google Chrome. Visual Studio provides client-side debugging support only for Chrome and Microsoft Edge (Chromium). Using these tools, you can examine the DOM or interact with the app using the JavaScript Console. If you want to use the Chrome Developer Tools, press F12 in the Chrome browser. Now, you can inspect your app state by hovering over variables currently in scope, using debugger windows like the Locals and Watch windows. The debugger pauses at the breakpoint you set (IDE highlights the statement in the yellow background). To run your app, press F5 ( Debug > Start Debugging). A breakpoint indicates where Visual Studio should suspend your running code, so you can look at the values of variables or the behavior of memory, or whether or not a branch of code is getting run. With your project open in Visual Studio, open a server-side JavaScript file (such as server.js), click in the gutter to set a breakpoint:īreakpoints are the most basic and essential feature of reliable debugging. If you are developing Node.js applications, you need to install the Node.js development workload with Visual Studio. Breakpoints are only hit when you have the debugger window open.If you haven't already installed Visual Studio, go to the Visual Studio downloads page to install it for free. May be a debugger is always attached in the browser, but it's only active when it's visible. My current workaround is to simply comment out the timer code, when I want to debug the Worker, but I would like to do a test. So, Is there a way to know, if a debugger is attached? My plan is to simply disable (or not start) the timer, when I'm debugging. Now the problem: When the breakpoint is hit in Worker, the timer fires 2 seconds later (since the main page thread is still running independantly) and terminates the Worker. Now to prevent that the Worker runs forever I have created a simple timer in the main page, that terminates the Worker after 2 seconds, like this: timer = setTimeout(function () This breakpoint will then get hit when I press my button to run the Worker (so far all good). When I run this page and press F12 to debug, I set a breakpoint in the Worker. I have created a page, that spawns a Worker. I would like to know, whether I'm currently debugging my javascript code?
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