how to pass value dropdown using javascript

Mar 11 2015 7:50 AM

i am create google map using javascript.1st coding am using textbox to pass latitude and longitude value ,map is show correct way.

But ,that some work in 2coding . am modify to drop down control to pass latitude and longitude value .not working.
please help me..

1.Text box coding:

<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>Show Google Map with Latitude and Longitude in asp.net website</title>
<style type="text/css">
html { height: 100% }
body { height: 100%; margin: 0; padding: 0 }
#map_canvas { height: 100% }
</style>
<script type="text/javascript"
src="https://maps.googleapis.com/maps/api/js?key=AIzaSyC6v5-2uaq_wusHDktM9ILcqIrlPtnZgEk&sensor=false">
</script>
<script language="javascript" type="text/javascript">
    function initialize() {
        var selectQueryString = "SELECT * FROM Product ORDER BY Name";
        var lat = document.getElementById('txtlat').value;
        var lon = document.getElementById('txtlon').value;
        var myLatlng = new google.maps.LatLng(lat, lon) // This is used to center the map to show our markers
        var mapOptions = {
            center: myLatlng,
            zoom: 6,
            mapTypeId: google.maps.MapTypeId.ROADMAP,
            marker: true
        };
        var map = new google.maps.Map(document.getElementById("map_canvas"), mapOptions);
        var marker = new google.maps.Marker({
            position: myLatlng
        });
        marker.setMap(map);
    }
</script>

</head>
<body >
<form id="form1" runat="server">
<table>
<tr>
<td>Enter Latitude:</td>
<td><input type="text" id="txtlat" value="13.053147716796578" /> </td>
</tr>
<tr>
<td>Enter Longitude:</td>
<td><input type="text" id="txtlon" value="80.2501953125" /> </td>
</tr>
<tr>
<td></td>
<td><input type="button" value="Submit" onclick="javascript:initialize()" /> </td>
</tr><tr>
</tr>
</table>
<div id="map_canvas" style="width: 500px; height: 400px"></div>
</form>
</body>
</html>

working this code.

2.dropdown coding:

<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>Show Google Map with Latitude and Longitude in asp.net website</title>
<style type="text/css">
html { height: 100% }
body { height: 100%; margin: 0; padding: 0 }
#map_canvas { height: 100% }
</style>
<script type="text/javascript"
src="https://maps.googleapis.com/maps/api/js?key=AIzaSyC6v5-2uaq_wusHDktM9ILcqIrlPtnZgEk&sensor=false">
</script>
<script language="javascript" type="text/javascript">
    function listBoxSelectedIndexChanged() {
        var ddcID = '<%= ddcity.ClientID %>'
       if (document.getElementById(ddcID).selectedIndex >= 0)
        {
        var selectQueryString = "SELECT lat_val,lon_val FROM TBLmap where t_description='abu'";
        //var lat = document.getElementById('txtlat').value;
        //var lon = document.getElementById('txtlon').value;
        var myLatlng = new google.maps.LatLng(selectQueryString) // This is used to center the map to show our markers
        var mapOptions = {
            center: myLatlng,
            zoom: 6,
            mapTypeId: google.maps.MapTypeId.ROADMAP,
            marker: true
        }
        };
        var map = new google.maps.Map(document.getElementById("map_canvas"), mapOptions);
        var marker = new google.maps.Marker({
            position: myLatlng
        });
        marker.setMap(map);
    }
</script>
<body >
<form id="form1" runat="server">
<table>
<tr>
<asp:DropDownList ID="ddcity" AutoPostBack="true" onchange="listBoxSelectedIndexChanged()" runat="server">
</asp:DropDownList>
</tr>
</table>
<div id="map_canvas" style="width: 500px; height: 400px"></div>
</form>
</body>
</html>
this code not working..

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