Turn a JavaScript local variable into a global variable

Question

I have a JavaScript function to generate a variable. That function is activated by an onclick button event.

After that variable is generated, I need to use it as a gl

Answer 1

Declare the variable outside the scope of the function:

var foo = null;

function myClickEvent() {
    foo = someStuffThatGetsValue;
}

Better yet, use a single global variable as the namespace ("MyApp") for your application, and store the value inside that:

var MyApp = {
    foo: null
};

function myClickEvent() {
    MyApp.foo = someStuffThatGetsValue;
}

The function itself could even be included in there.