![]() First, you can add the JavaScript “debugger” statement directly into the code where you’d like to start a debug session, which will force a breakpoint to occur at runtime at that location in your code. There are several ways to solve this problem. NET status bar that states “This is not a valid location for a breakpoint” when you try to set the breakpoint. Instead, you’ll see a message at the bottom of the Visual Studio. NET is open and available for debugging, you won’t be able set a breakpoint if the script is embedded within the page. Once script code is executed in Internet Explorer, you’ll be prompted to use the Visual Studio. If you select Break at Next Statement, nothing will happen until an action is performed that causes script within the page (or script referenced by the page) to execute. NET is already open, you can begin debugging, or you can choose to start a new instance of Visual Studio. NET as the debugger, as shown in Figure 3. If you select Open, you’ll be prompted to start using Visual Studio. You’ll be presented with two different options, Open and Break at Next Statement, as shown in Figure 2. For this to work, you must enable Internet Explorer for debugging as described in the previous section. ![]() To start a debug session for an ASP.NET AJAX page, navigate to the page that you’d like to debug and select View–>Script Debugger from the Internet Explorer menu (see Figure 2). One of the easiest ways is to use the built-in script debugging capabilities of Internet Explorer. You can start a debug session several different ways. The following sections walk you through the options.ĭebugging with Internet Explorer and Visual Studio. Once debugging is enabled in Internet Explorer, an ASP.NET AJAX page can be debugged using several techniques. A side-effect of checking this checkbox is that you’ll find that many other Web sites have errors as you browse to them, so you may want to leave it unchecked when you’re not debugging your own applications.įigure 1 shows what the Internet Explorer Advanced settings should look like to enable debugging. If this box isn’t checked, an icon will appear in the lower-left corner of the browser unless you click, it you may miss noting that a client-side error occurred. Disable script debugging (Internet Explorer)Īlso, check the “Display a notification about every script error” checkbox below these items so that you’re notified as errors occur in a page.The Advanced tab defines two items that need to be unchecked (a check means you can’t debug): The debug capabilities in Internet Explorer 6 or higher are disabled by default but can be turned on by going to Tools–>Internet Options–>Advanced. Learning how to leverage Internet Explorer debugging features can enhance your productivity and significantly minimize the amount of time you spend hunting down bugs and other issues. NET 2005 or Microsoft’s Script Debugger, as shown in the following sections. Fortunately, Internet Explorer 6 or higher includes integrated debugging functionality that can be used to start a debug session and step through ASP.NET AJAX code with a debugging tool such as Visual Studio. And there are also several different debugging techniques available in Firefox that can simplify the process of debugging ASP.NET AJAX applications.ĭebugging JavaScript has proven to be somewhat of a challenge and has resulted in many developers resorting to “alert style” debugging to better understand how an application is working. This article looks at several ways to use Internet Explorer and Visual Studio to debug JavaScript. There are several tools to intercept and view request and response messages, to more easily track down data issues and monitor AJAX request and response message sizes. For example there is debug functionality available in the ASP.NET AJAX script library that can be used to make assertions and perform tracing operations. There are many tools available to you as an ASP.NET AJAX developer to efficiently debug and test your applications. Knowing how to quickly debug ASP.NET AJAX applications can greatly increase your productivity as a developer and reduce the amount of frustration experienced while tracking down issues. ![]() No matter how good a development platform is, however, bugs and other issues can be introduced by developers and triggered by end users. Microsoft’s ASP.NET AJAX framework provides a solid foundation for building efficient and high performance Web-based applications that can enhance the overall end user experience.
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