How to select and display a collection

Hey Mark, thanks for the answer.

I'll post the next question as a new topic.

The script looks for proxy files (JPEG) that are stored in a different folder than the working files (PSD).

The logic should be simple: get selection -> find matching JPEG for each selected file -> go to JPEG folder and select corresponding files.

The part I am unsure about is how to navigate to the JPEG folder then select the corresponding files.

My first issue is how to create an event handler that has access to the scope of my function, it needs to know the array of files to select.

I solved that by declaring the handler inside my function, which seems to work. Is that a good solution?

The second issue is how to let the handler know when we need to select the files. Obviously I don't want this to happen every time I open a folder.

I solved that by un-registering the handler at the end of it's function, that makes it a single use handler? This seems dodgy as the pop method doesn't take an argument and I can't specify which handler to pop.

I also don't know whether it's good to register a new handler every time I run the script? Is it slow? will they add up in the memory?

Lastly, I'm unsure of what the line "return { handler:false }" does, it's found at the end of every event handler.

I've edited the code to help:

function select_proxys(){

     
    // get selection
    if (app.document.selectionLength > 0){ 
        var thumb_array = app.document.getSelection("psd,jpg,png,swf,fla,ai");
    } 
     
    // find corresponding proxys
    var proxy_array = find_proxys( thumb_array );


    if (proxy_array > 0) 
    { 
        // define event handler function
        function onDocLoaded( event ){ 
            if ( event.object instanceof Document && event.type == 'loaded' )
            { 
                // select the proxy thumbnails
                for (var i = 0; i < proxy_array.length; i++){
                    app.document.select (proxy_array) 

                }; 
                // un-register the event handler
                app.eventHandlers.pop(); 
            } 
            return { handled: false }; 
        };
        
        // register the event handler
        app.eventHandlers.push( { handler: onDocLoaded } ); 
        // navigate to the proxy parent folder, triggering the event handler.
        app.document.thumbnail = proxy_array[0].parent; 
    };
};

select_proxys();