Total newbie question. how do i get the following code to work.
var f_str = "function test(msg) { alert(msg) }"
var f = eval(f_str)
f("hello")
The idea is to have the function test as a string, and be able to execute it as a function. eval doesn't seem to work, and i have tried JSON.parse too, without luck..
Add parentheses around f_str, so that it's interpreted as a function expression.
var f_str = "(function test(msg) { alert(msg) })";
var f = eval(f_str);
f("hello");
In your current code, the code is interpreted as a function declaration. You can see this by printing / using the value of test:
var f_str = "function test(msg) { alert(msg) }";
var f = eval(f_str);//^^^^
test("hello"); // <--
This is usually a bad idea; if you want to execute dynamic JavaScript, you can use a snippet like this:
(function() {
var code = document.createElement('script');
code.type = 'text/javascript';
code.async = true;
code.src = '/path/to/script';
var s = document.getElementsByTagName('script')[0];
s.parentNode.insertBefore(code, s);
}());
Or use jQuery.getScript():
$.getScript('/path/to/script');
