Convert string (was a function) back to function in Javascript

Question

I have this function below as a string. How would I convert it back into a function? I am pulling event handlers from JQuery events and I want to store them as string then convert them back because they will be saved in mySQL

function () {

    if (!GActiveClick) {
        return;
    }
    SaveProduct();
}

Answer 1

var func = new Function(theFunctionString);
func();

MDN:

new Function ([arg1[, arg2[, ... argN]],] functionBody)

Parameters

arg1, arg2, ... argN
Names to be used by the function as formal argument names. Each must be a string that corresponds to a valid JavaScript identifier or a list of such strings separated with a comma; for example "x", "theValue", or "a,b".

functionBody
A string containing the JavaScript statements comprising the function definition.

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Update:

All this a very bad practice!
You should have a generic function that get parameters that build what you want. The only thing that change are the parameters. Store those parameters in the DB you have.

Answer 2

Use the return when using new Function() and execute it, like this

new Function('return ' + fn_string)();

Example:

function hackerAll(a, b) {
  var result = a*b
  return result
}

class Doggy{
  method1(){
    return 123123*342343
  }
}

var fn_string = hackerAll.toString()
var back_to_fn = new Function(`return ${fn_string}`)() //This restore the function with name, params and all, even es7 class works

var class_string = Doggy.toString()
var back_to_class = new Function(`return ${class_string}`)()

console.log('fn as it', hackerAll)
console.log('fn string', fn_string)
console.log('restored fn', back_to_fn)
console.log('restored class', back_to_class)