Calling dynamic function with dynamic number of parameters

Question

I’m looking for a trick about this. I know how to call a dynamic, arbitrary function in JavaScript, passing specific parameters, something like this:

function mainfunc(func, par1, par2){
    window[func](par1, par2);
}

function calledfunc(par1, par2){
    // Do stuff here
}

mainfunc('calledfunc', 'hello', 'bye');

I know how to pass optional, unlimited parameters using the arguments collection inside mainfunc, but, I can’t figure how to send an arbitrary number of parameters to mainfunc to be sent to calledfunc dynamically; how can I accomplish something like this, but with any number of optional arguments (not using that ugly if–else)?

function mainfunc(func){
    if(arguments.length == 3)
        window[func](arguments[1], arguments[2]);
    else if(arguments.length == 4)
        window[func](arguments[1], arguments[2], arguments[3]);
    else if(arguments.length == 5)
        window[func](arguments[1], arguments[2], arguments[3], arguments[4]);
}

function calledfunc1(par1, par2){
    // Do stuff here
}

function calledfunc2(par1, par2, par3){
    // Do stuff here
}

mainfunc('calledfunc1', 'hello', 'bye');
mainfunc('calledfunc2', 'hello', 'bye', 'goodbye');

Answer 1

Use the apply method of a function:-

function mainfunc (func){
    window[func].apply(null, Array.prototype.slice.call(arguments, 1));
} 

Edit: It occurs to me that this would be much more useful with a slight tweak:-

function mainfunc (func){
    this[func].apply(this, Array.prototype.slice.call(arguments, 1));
} 

This will work outside of the browser (this defaults to the global space). The use of call on mainfunc would also work:-

function target(a) {
    alert(a)
}

var o = {
    suffix: " World",
    target: function(s) { alert(s + this.suffix); }
};

mainfunc("target", "Hello");

mainfunc.call(o, "target", "Hello");

Answer 2

Your code only works for global functions, ie. members of the window object. To use it with arbitrary functions, pass the function itself instead of its name as a string:

function dispatch(fn, args) {
    fn = (typeof fn == "function") ? fn : window[fn];  // Allow fn to be a function object or the name of a global function
    return fn.apply(this, args || []);  // args is optional, use an empty array by default
}

function f1() {}

function f2() {
    var f = function() {};
    dispatch(f, [1, 2, 3]);
}

dispatch(f1, ["foobar"]);
dispatch("f1", ["foobar"]);

f2();  // calls inner-function "f" in "f2"
dispatch("f", [1, 2, 3]);  // doesn't work since "f" is local in "f2"

Answer 3

You could use .apply()

You need to specify a this... I guess you could use the this within mainfunc.

function mainfunc (func)
{
    var args = new Array();
    for (var i = 1; i < arguments.length; i++)
        args.push(arguments[i]);

    window[func].apply(this, args);
}

Answer 4

Here's what you need:

function mainfunc (){
    window[Array.prototype.shift.call(arguments)].apply(null, arguments);
}

The first argument is used as the function name and all of the remaining ones are used as arguments to the called function...

We're able to use the shift method to return and then delete the first value from the arguments array. Note that we've called it from the Array prototype since, strictly speaking, 'arguments' is not a real array and so doesn't inherit the shift method like a regular array would.

---

You can also call the shift method like this:

[].shift.call(arguments);

Answer 5

The simplest way might be:

var func='myDynamicFunction_'+myHandler;
var arg1 = 100, arg2 = 'abc';

window[func].apply(null,[arg1, arg2]);

Assuming, that target function is already attached to a "window" object.

Answer 6

If you want to pass with "arguments" a few others, you have to create the array of all arguments together, i.e. like this:

var Log = {
    log: function() {
        var args = ['myarg here'];
        for(i=0; i<arguments.length; i++) args = args.concat(arguments[i]);
        console.log.apply(this, args);
    }
}

Answer 7

Now I'm using this:

Dialoglar.Confirm = function (_title, _question, callback_OK) {
    var confirmArguments = arguments;
    bootbox.dialog({
        title: "<b>" + _title + "</b>",
        message: _question,
        buttons: {
            success: {
                label: "OK",
                className: "btn-success",
                callback: function () {
                    if (typeof(callback_OK) == "function") {                            callback_OK.apply(this,Array.prototype.slice.call(confirmArguments, 3));
                    }
                }
            },
            danger: {
                label: "Cancel",
                className: "btn-danger",
                callback: function () {
                    $(this).hide();
                }
            }
        }
    });
};

Answer 8

function a(a, b) {
    return a + b
};

function call_a() {
    return a.apply(a, Array.prototype.slice.call(arguments, 0));
}

console.log(call_a(1, 2))

console: 3

Answer 9

Couldn't you just pass the arguments array along?

function mainfunc (func){
    // remove the first argument containing the function name
    arguments.shift();
    window[func].apply(null, arguments);
}

function calledfunc1(args){
    // Do stuff here
}

function calledfunc2(args){
    // Do stuff here
}

mainfunc('calledfunc1','hello','bye');
mainfunc('calledfunc2','hello','bye','goodbye');

Answer 10

In case somebody is still looking for dynamic function call with dynamic parameters -

callFunction("aaa('hello', 'world')");

    function callFunction(func) {
                try
                {
                    eval(func);
                }
                catch (e)
                { }
            }
    function aaa(a, b) {
                alert(a + ' ' + b);
            }