Trying to save to Calender List SharePoint-Hosted App

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application

SharePoint2013

I am trying to add to a Calender List but dont get it to work, i dont get any value either,

Can someone help me?

function createItem() {

   var targetList = list.getByTitle('AppbokningarList');
    var listItemTitle = document.getElementById('Textrubrik').value;
    alert(listItemTitle);
    var listItemCustom = document.getElementById('datepicker').value;
    alert(listItemCustom);
    var listItemFromTime = document.getElementById('timepicker').value;
    alert(listItemFromTime);
    var listItemtoDate = document.getElementById('datepickerto').value;
    alert(listItemtoDate);
    var listItemToTime = document.getElementById('timepickerTo').value;
    alert(listItemToTime);
    var listItemBeskrivning = document.getElementById('Textbeskrivning').value;
    alert(listItemBeskrivning);
    var result = listItemCustom + "T" + listItemFromTime +":00" + "Z";
    var result2 = listItemtoDate + "T" + listItemToTime + ":00" + "Z";


    var camlQuery = new SP.CamlQuery();
    camlQuery.set_viewXml('<View><Query><Where><And><Eq><FieldRef Name=\'EventDate\' /><Value IncludeTimeValue=\'TRUE\' Type=\'DateTime\'>' + result + '</Value></Eq><Eq><FieldRef Name=\'EndDate\' /><Value IncludeTimeValue=\'TRUE\' Type=\'DateTime\'>' + result2 + 'Z</Value></Eq></And></Where></Query></View>');
    this.collListItem = targetList.getItems(camlQuery);
    context.load(collListItem);


    context.executeQueryAsync(
        function() {
            var itemCount = collListItem.get_count();
            if (itemCount > 0) {

                alert(itemCount);   

            } else {
                alert('go ahead and create the event the user wants');

                var listItemCreateInfo = new SP.ListItemCreationInformation();
                var newItem = targetList.addItem(listItemCreateInfo);
                newItem.set_item('Title', listItemTitle);
                newItem.set_item('EventDate', result);
                newItem.set_item('EndDate', result2);
                newItem.set_item('Description', listItemBeskrivning);

                newItem.update();
                context.load(newItem);
                context.executeQueryAsync(

        function () {
            alert("update");
                },
                function(sender, args) {
                    alert(args.get_message());


                }
    );

            }
        },
        function(sender, args) {
            alert(args.get_message());


        }
    );


}