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How to Trace Caller Function Details (Line Number and Source URL) in JavaScript?
How to Trace Caller Function Details (Line Number and Source URL) in JavaScript?
Oct 20, 2024 pm 09:53 PM
Tracing Caller Details in JavaScript: Line Number and Source URL
To trace the caller function's details, including the line number and source URL, consider the following approach:
Getting the Caller Function Name:
<br>var callerFunc = arguments.callee.caller.toString();<br>callerFuncName = (callerFunc.substring(callerFunc.indexOf("function") 8, callerFunc.indexOf("(")) || "anoynmous")<br>
This code snippet obtains the name of the caller function.
Retrieving the Caller Line Number:
To get the line number from which the caller function was invoked:
function getErrorObject() {
try {
throw Error('');
} catch (err) {
return err;
}
}
var err = getErrorObject();
var caller_line = err.stack.split("\n")[4];
var index = caller_line.indexOf("at ");
var clean = caller_line.slice(index + 2, caller_line.length);
This method leverages the JavaScript error object's stack property to access the caller's line number.
Determining the Caller Source URL:
Unfortunately, it is not straightforward to obtain the source URL directly from the caller function. However, you can use a bundler like webpack with source maps to generate a mapping between the bundled code and the source files, allowing you to map the caller's line number to its original source location.
The above is the detailed content of How to Trace Caller Function Details (Line Number and Source URL) in JavaScript?. For more information, please follow other related articles on the PHP Chinese website!
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