prevent double meeting sharepoint calendar csom - sharepoint

Question

I am trying to make it if the date and time are already booked in the calender dont book, i am using this code and nothing get displayed? Any Sugestions?
var context = SP.ClientContext.get_current();
var web = context.get_web();
var list = web.get_lists();
var targetList;
function createItem() {
targetList = list.getByTitle("AppbokningarList");
var listItemCreation = new SP.ListItemCreationInformation();
var newItem = targetList.addItem(listItemCreation);
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);
newItem.set_item('Title', listItemTitle);
var result = listItemCustom + " " + listItemFromTime;
newItem.set_item('EventDate', result);
var result2 = listItemtoDate + " " + listItemToTime;
newItem.set_item('EndDate', result2);
newItem.set_item('Description', listItemBeskrivning);
var camlQuery = new SP.CamlQuery();
camlQuery.set_viewXml("<Where><Geq><FieldRef Name='EventDate' /><Value Type='DateTime'>" + result + "</Value></Geq><Leq><FieldRef Name='EndDate' /><Value Type='DateTime'>" + result2 + "</Value></Leq><FieldRef Name='RecurrenceID' /></Where>");
this.collListItem = targetList.getItems(camlQuery);
context.load(collListItem);
var property = new SP.EventProperties();
if (collListItem > 0) {
property.cancel = true;
}
newItem.update();
context.load(newItem);
context.executeQueryAsync(Function.createDelegate(this, this.onQuerySucceeded),Function.createDelegate(this, this.onQueryFailed));
}
function onQuerySucceeded(sender, args) {
var succeded = "Mötet är nu bokat!";
alert(succeded);
}
function onQueryFailed(sender, args) {
var failed = "Redan bokat!";
alert(failed);
}

Answer 1

Look at all your set_items. Most likely your date fields need an actual date object to be stored successfully to SP.
var currDate = new Date();
listItem.set_item('DateColumn',currDate);
listItem.update();
Cool stuff here to: http://alexeybbb.blogspot.com/2012/09/sharepoint15-js-update-datetime-field.html