Textbox Autopostback not trigerring. Tried many solutions.

Hi, Please have a look at my code below. I have Google Places Search API on my page. I have a txtSearch textbox control that is linked with the Google API. When you start search it shows a list of suggestions from which you can select one.  I have a function FindCoordinates that gets the location from txtSearch and passed it to Google Maps API and gets the coordinates which are then used to populate the listview control. The problem here is that txtSearch won't trigger AutoPostback or textChanged functions. I've tried so many solutions, onBlur, onKeyup, tried calling a static function from JavaScript but nothing seems to work. I would really appreciate your help.
Front page:
<%@ Page Title="Search Reviews" Language="C#" MasterPageFile="~/Site.master" AutoEventWireup="true" CodeFile="SearchReviews.aspx.cs" Inherits="Content_SearchReviews" %> <%@ Registe ...