Question

I’ve just asked about calling functions by name, now I want to process return statement after SetTimeout:

function ECall(funcName, arg)
{
    command += "(";
    for (var i=1; i<arguments.length; i++) 
    {
        command += "'" + arguments[i] + "'";
        if (i != arguments.length-1) command += ',';
    }
    command += ")";

    //var funcPtr = eval(funcName);
    //return funcPtr(arg); // This works, but I need SetTimeout

    setTimeout('window[\'' + funcName + '\']' + command, 1000);
}

setTimeout works great, but I have to save return value of called function. When I write: setTimeout('alert(window[\'' + funcName + '\']' + command + ')', 1000);
It alerts return value of function. How can I store it?

Answer 1

You don’t need to use any of this string manipulation. Just pass a function reference to window.setTimeout(). To store the returned value of the function, simply assign it to a variable in the function you pass to window.setTimeout()

var savedValue;

function ECall(funcName)
{
    var args = Array.prototype.slice.call(arguments, 1);
    var func = window[funcName];

    window.setTimeout(function() {
        savedValue = func.apply(this, args);
    }, 1000);
}