Script issue: Checkbox is returning false, even when checked

I recommend you keep the checkbox value in a variable that you declare outside the ScriptUI Window scope. Then you make an event listener "onClick" that updates it whenever user clicks the checkbox.

Here's one way to code it:

var myCheckBoxValue = false;

var myWindow = new Window("dialog");
myWindow.orientation = "column";

var test = '';
var button = myWindow.add("button", undefined, "Run");
var checkbox = myWindow.add("checkbox", undefined, "Checkbox");

checkbox.onClick = function () { myCheckBoxValue = this.value };
button.onClick = function () { test = '0'; myWindow.close() };
myWindow.show();

if (test != '') main(test);

function main() {

    if (myCheckBoxValue == true) {
        alert("Checkbox returned true");
    } else {
        alert("Checkbox returned false");
    }
}

 - Mark

You need to check checkbox.value