Tips for using Chrome Dev Tools to troubleshoot JavaScript code embedded in a webpage

Currently, I am deeply involved in a project at my workplace where I am tasked with fixing tickets and debugging issues. I have reached a point where I need to understand what values the Javascript code is returning.

Here's the problem I am facing:

The Javascript code is embedded within the jsp file that is being displayed, meaning it is not in a separate file. As a result, Chrome's Dev Tool is unable to display it and does not allow me to set breakpoints in the jsp file on the page itself. I am looking to inspect the values and ensure everything is functioning correctly within the local scope. Since I did not write the code, I am hoping to make minimal modifications to it.

Now, my question is whether there is a way, besides refactoring and moving the Javascript to a separate file, to monitor its execution. I might be missing some features within Chrome's Dev Tool as I am not well-versed in all of its functionalities.

Thank you for your assistance in advance! If anything is unclear, please let me know so I can clarify it.

Answer №1

If you want to set a breakpoint, you need to follow these steps: Check out this useful resource: https://developers.google.com/web/tools/chrome-devtools/debug/breakpoints/add-breakpoints?hl=en

To set a breakpoint, simply click on the line number on the left side of the code.

Answer №2

For optimal performance, it's recommended to keep your JavaScript code in a separate file from your JSP and simply include the file path in a <script> tag. This way, you can leverage the caching capabilities of the browser.

Nevertheless, you can still debug your JavaScript code within the JSP file. By inserting a debugger; statement in the JavaScript section of your JSP, the debugger will pause when the browser processes the code, granting you access to your client-side scope for debugging purposes.

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