loading multiple files from custom action with SP.ClientContext

I made a custom action that calls GetSelectedListItemAsString(). it should load the files 1 by 1 but somehow it does not load the files can somebody help me with it underneat a code snippet of the code which errors.

var clientContext = '';
var web = '';
var list = '';
var items = '';
var item = '';

function GetSelectedListItemsAsString() {
    SP.SOD.executeOrDelayUntilScriptLoaded(initialize, 'SP.js');
}

function initialize() {
   
    this.clientContext = new SP.ClientContext.get_current();
    this.web = this.clientContext.get_web();
    this.clientContext.load(web);
    this.clientContext.executeQueryAsync(Function.createDelegate(this, getRelativeUrl), Function.createDelegate(this, getFailed));
    try {
        this.list = this.web.get_lists().getByTitle('Deliverables');

        this.items = SP.ListOperation.Selection.getSelectedItems(this.clientContext);
        var count = CountDictionary(this.items);
      
        for (var i in this.items) {
           // alert(i);
            if (this.items[i].fsObjType == 0) {
                this.item = this.list.getItemById(this.items[i].id);
                this.clientContext.load(this.item, 'FileLeafRef');
                
            }
        }

        clientContext.executeQueryAsync(onItemsLoaded, onError);
    }
    catch (e) {
        alert('Exception: ' + e);
    }
}

function getRelativeUrl(ctx) {
  //  alert('web.get_serverRelativeUrl() ' + web.get_serverRelativeUrl());
}

function getFailed() {
    alert('Failed to retrieve the server relative URL.');
}

function onItemsLoaded() {
    alert('onItemsLoaded');
    alert(this.item.get_item('Status'));
    for (var i in this.items) {
        alert(i);
    }
}

function onError(e) {
    alert('Error: ' + e);
}

thanks in advance.

Paul

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