I am looking for an equivalent in Chrome to the "break on all errors" functionality of Firebug. In the Scripts tab, Chrome has a "pause on all exceptions", but this is not quite the same as breaking on all errors.
For instance, when loading a page with the following code, I would like Chrome to break on the line foo.bar = 42. Instead, even when enabling the "Pause on all exceptions", I don't get the expected result.
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
<script type="text/javascript">
function doError() {
foo.bar = 42;
}
window.onload = function() {
try {
doError();
} catch (e) {
console.log("Error", e);
}
}
</script>
</head>
<body>
</body>
</html>
You can try the code pasted above on this page or using this jsFiddle.
This question is related to
javascript
google-chrome
debugging
webkit
The answer is
Unfortunately, it the Developer Tools in Chrome seem to be unable to "stop on all errors", as Firebug does.
This is now supported in Chrome by the "Pause on all exceptions" button.
To enable it:
- Go to the "Sources" tab in Chrome Developer Tools
- Click the "Pause" button at the bottom of the window to switch to "Pause on all exceptions mode".
Note that this button has multiple states. Keep clicking the button to switch between
- "Pause on all exceptions" - the button is colored light blue
- "Pause on uncaught exceptions", the button is colored purple.
- "Dont pause on exceptions" - the button is colored gray
Just about any error will throw an exceptions. The only errors I can think of that wouldn't work with the "pause on exceptions" option are syntax errors, which happen before any of the code gets executed, so there's no place to pause anyway and none of the code will run.
Apparently, Chrome won't pause on the exception if it's inside a try-catch block though. It only pauses on uncaught exceptions. I don't know of any way to change it.
If you just need to know what line the exception happened on (then you could set a breakpoint if the exception is reproducible), the Error object given to the catch block has a stack property that shows where the exception happened.
I got trouble to get it so I post pictures showing different options:
Chrome 75.0.3770.142 [29 July 2018]
Very very similar UI since at least Chrome 38.0.2125.111 [11 December 2014]
In tab Sources :
When button is activated, you can Pause On Caught Exceptions with the checkbox below:
Previous versions
Chrome 32.0.1700.102 [03 feb 2014]
Source: Stackoverflow.com