Pass an arbitrary number of parameters into a JavaScript function

Question

My JavaScript code is barely an Ajax request that expects XML to be returned from back-end. The back-end can return execute_callback as one of XML tags like thi

Answer 1

Instead of calling the function, reference your function as an element in an associative array by name:

var funcName = // parse your xml for function name
var params = new Array();
params[0] = 10.2; // from your parsed xml
params[1] = 'some text'; // also from your parsed xml

// functions are attached to some Object o:

o[funcName](params); // equivalent to o.funcName(params);

I wrote an example of the above here: http://jsbin.com/ewuqur/2/edit

Answer 2

You could refer to Function.apply. Assuming the callback functions are declared in global object (window in browser).

var callback_function = window[function_name];
if (callback_function) { // prevent from calling undefined functions
    callback_function.apply(window, params);  // params is an array holding all parameters
}

Answer 3

You can just pass them all into your function:

function someFunction(){
    for(i = 0; i < arguments.length; i++)
        alert(arguments[i]);
}

Javascript functions have an arguments array-like object, and it is syntactically correct to call a javascript function with any number of arguments.

someFunction(1, 2, 'test', ['test', 'array'], 5, 0);

is a valid call to that function.