Lightning Components Developer Guide
jNewer Version Available
eval() Function is Limited by Locker Service
In Locker Service, use of the eval() function is supported to enable use of third-party libraries that evaluate
code dynamically. However, it is limited to work only in the global scope of the namespace.
The eval() function can’t access the local variables
within the scope in which it’s called.
Normally, eval() has two modes of execution. When you invoke eval() directly, it works in the local scope. When you invoke it via a reference, it works in the global scope. Locker Service only supports the latter.
For example, suppose that you execute the following code:
1window.foo = 1;
2function bar() {
3 var foo = 2;
4 return eval("foo");
5}A call to bar() returns 2 when evaluation is performed in the local scope, and returns 1 when it’s performed in the global scope. If you must use variables from the local scope, refactor your code. Use a Function(), declare the local variables as parameters, pass them as arguments, and add a return statement:
1window.foo = 1;
2function bar() {
3 var foo = 2;
4 return Function("foo","return foo")(foo);
5}