When working on JavaScript code using Chrome's developer tools, debugging is an essential part of ensuring your code works as intended. However, sometimes keeping track of breakpoints can be a bit tricky, especially if you need to save them between page refreshes or trigger them programmatically. In this guide, we'll walk you through how to save breakpoints in Chrome's developer tools and trigger them via code.
### Saving Breakpoints Between Page Refreshes:
1. Navigate to the "Sources" tab in Chrome's developer tools.
2. Set your breakpoints as you would normally by clicking on the line number where you want to pause the code execution.
3. Right-click on the breakpoint bubble and select "Edit breakpoint."
4. In the breakpoint settings, you'll see an option to "Automatically continue after evaluating."
5. Uncheck this option to ensure that the breakpoint persists even after page reloads.
By following these steps, you can save your breakpoints between page refreshes and continue debugging without the need to reset them every time.
### Triggering Breakpoints via Code:
Sometimes, you may want to trigger breakpoints in your JavaScript code based on certain conditions. Here's how you can do that:
1. Insert the `debugger;` statement in your code where you want to trigger the breakpoint.
function myFunction() {
// Some code
debugger; // This will trigger a breakpoint here
// More code
}
// Call the function
myFunction();By adding the `debugger;` statement in your code, Chrome's developer tools will pause the execution at that point, allowing you to inspect variables, trace the flow of your code, and troubleshoot any issues.
### Bonus Tip - Using Conditional Breakpoints:
Another handy feature in Chrome's developer tools is conditional breakpoints. This allows you to set conditions under which a breakpoint will be triggered. Here's how to set a conditional breakpoint:
1. Right-click on an existing breakpoint and select "Edit breakpoint."
2. In the breakpoint settings, enter your condition in the provided input field.
3. Click "Save" to apply the condition to the breakpoint.
Conditional breakpoints can be incredibly useful when you want to pause the code execution only when specific conditions are met, saving you time and allowing for more focused debugging.
In conclusion, being able to save breakpoints between page refreshes and trigger them via code in Chrome's developer tools can significantly improve your debugging workflow. By following the steps outlined in this article, you'll be better equipped to tackle bugs and optimize your JavaScript code effectively. Happy debugging!