Stop script if something is missing

Question

Hello AEScripters,
can you tell me how to stop a script while running if a condition isn't right?
i tried stop() and exit() (normaly they do  the trick…)
But i get a alert that these functions are not defined?
i use them within  a function. Could this be the problem?
I have something like this:
main();
function main(){
if (something != null){
        if (selectedItems.length > 0) {
            // check to see if anything is selected
            targetItems = app.project.selection;
            // if so the use the selection
        else {
            alert("nothing is selected.");
                         exit(); // doesen't work
                         stop(); // doesen't work either
Thanx for you help.
:F
p.s. the whole code is here. -> https://github.com/fabiantheblind/compify2_slim/blob/master/compify2_slim.jsx

Answer 1

Hi,
Just call return at the point where you want to exit. It will not stop the running script, but since you're doing all the work inside main() it will exit from the function. And providing that you don't have any statements after the  call to main() the script will terminate.
main();
function main(){
if (something != null){
        if (selectedItems.length > 0) {
            // check to see if anything is selected
            targetItems = app.project.selection;
            // if so the use the selection
        else {
            alert("nothing is selected.");
            return;
regards
Ludde