Last Updated on: October 10, 2022
One big difficulty is the lack of an effective display of debugging messages. You can overcome these limitations with the help of external debuggers.
You can install Firebug in the same way as any other Firefox plug-in, simply go to the Firefox add-ins tools, search for it and then follow the prompts to install the software,
Once installed, you can activate Firebug when you press the F12 key. You are now ready to debug your code.
A good way to start is to create breakpoints in your script. These breakpoints allow you to run through the code and pause so you can examine the value of each variable to help you find the problem. To create a breakpoint:
- Click on the green check button to toggle the Firebug debug panel
- Switch to the script tab
- Scroll to the desired line and set a breakpoint by clicking on the left sidebar
- Reload the page
You can step through your code one line at a time using the step-over function. With each line, you can check the current value of any variables to help you determine if any of them are the cause of the problem.
An alternative method that you can use to set breakpoints is to use the following line in your code:
Another useful feature of Firebug is the ability to display script output. You can use an alert message box to pause script execution or the console.log function. This example demonstrates the use of this function:
console.log(“Start”); console.log(“Title: %s, page: %d”, title, page);
Good debugging skills can save a lot of time the next time you need to locate a bug.
Get notified of new posts: