Question

I’m looking for a way to handle calls to undefined methods and properties in JavaScript.

These would be similar to the PHP magic methods __call, __callStatic, __get.

An example of the code using this might be:

var myObject = {};
myObject.__call = function (called, args) {
    alert(called);
    alert(args);
    return(true);
}

myObject.meow("kitty", "miau");

This would result in the first alert dialog displaying “meow” and the second to display “kitty, miau”.

Answer 1

There is a magic function in Javascript called __noSuchMethod__. Here’s an example:

var foo = { __noSuchMethod__ : function(name,params) { alert('invalid function call'); } }
foo.bar();

EDIT: As @jldupont mentioned, this is actually only in Rhino and SpiderMonkey (Mozilla’s JS engine); it is not supported in the ECMAScript standard. There are some requests that it be in ECMAScript 4.