The title should be self explanatory, and I wonder if there is a workaround for this.
Window.call.apply;
>> function apply()
Window.call.apply();
>> Uncaught TypeError: Window.call.apply is not a function
at <anonymous>:2:13
at Object.InjectedScript._evaluateOn (<anonymous>:895:140)
at Object.InjectedScript._evaluateAndWrap (<anonymous>:828:34)
at Object.InjectedScript.evaluate (<anonymous>:694:21)
Basically, I am surprised that apply works on every function except one.
I am writing some higher level VM that needs to call native javascript functions (sadly, Function.prototype.call is one of them), so I need the function apply to be able to pass my this context and array of arguments.
Updated:
It seems that this is just some weird error message.
I found this when I wanted to be able to call a constructor with variable number of arguments and passing this explicitly, which is an object instead of the expected function.
Perhaps below is a more realistic example:
function Fruit(name) {
this.name = name;
}
var x = {};
Fruit.call(x, "Apple");
// I thought this would also work, but it throws above error message
(Fruit.call).apply(x, ["Apple"]);
// Should instead use the constructor directly
Fruit.apply(x, ["Apple"]);
// or
(Fruit.call).apply(someFunction, [x, "Apple"]);
You are getting the error because you are not passing an argument to .apply. Firefox throws a more reasonable error:
TypeError: Function.prototype.call called on incompatible undefined
It works fine in both browsers if you actually pass a function that should be called:
Window.call.apply(function foo() { console.log('foo'); });
Note: If you actually want to apply the Window function to an arbitrary object, this probably won't work. Host objects/functions are often more restrictive, especially when it involves the DOM.
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