[Solved-6 Solutions] Find out caller function in javascript - javascript tutorial
Problem
How to find out the caller function in JavaScript ?
Solution 1:
This code checks the value a function's caller property.
function myFunc() {
if (myFunc.caller == null) {
return 'The function was called from the top!';
} else {
return 'This function\'s caller was ' + myFunc.caller;
}
}Solution 2:
Just console log your error stack.
const hello = () => {
console.log(new Error('I was called').stack)
}
const sello = () => {
hello()
}
sello()Solution 3:
Try this:
function Hello()
{
alert("caller is " + Hello.caller);
}function Hello()
{
alert("caller is " + arguments.callee.caller.toString());
}
Read Also
Call and applySolution 4:
You can use this code:
function Hello() {
alert("caller is " + arguments.callee.caller.toString());
}
is equivalent to this:
function Hello() {
alert("caller is " + Hello.caller.toString());
}
In case we decide to refactor the name of the invoked function (Hello), we would have to change all its occurrences.
Solution 5:
We can get the full stacktrace:
arguments.callee.caller
arguments.callee.caller.caller
arguments.callee.caller.caller.caller
Until caller is null.
It cause an infinite loop on recursive function.
Solution 6:
We can use Function.Caller to get the calling function. The following code illustrates its use:
function Hello() { return Hello.caller;}
Hello2 = function NamedFunc() { return NamedFunc.caller; };
function main()
{
Hello(); //both return main()
Hello2();
}