Question

Is there a way to call a function (or a property) on an object via reflection, in JavaScript?

Lets say that during run-time, my code has already determined that objectFoo indeed has a property called ‘bar’. Now that my code knows that, the next thing I want to do is invoke that. Normally i would do this: var x = objectFoo.bar. But ‘bar’ was determined at run time, so I need to invoke it using reflection.

Answer 1

EVAL:
http://www.w3schools.com/jsref/jsref_eval.asp

Eval will allow you to run any javascript code by passing in a string and having the javascript engine evaluate it as javascript code.

If you mean that you want to first search a list properties of an object, then look at this:

var o = {}
for(att in o){
    alert(o[att]);
}

If you do this, you can even set the property’s value by accessing it as if it were an array (all objects are actually associative arrays).

obj["propertyName"] = "new value";
obj["MethodName"]();