I want to update the markers on google map. Google map div is inside a updatepanel. I tried calling map loading JavaScript function by various means but no luck. function is getting called but map showing only old markers not updated one. To regenerate the scenario, i am doing it on tick of timer in below. Ontick, repeater datasource table is getting updated but not markers data.
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<script type="text/javascript" src="https://maps.googleapis.com/maps/api/js?key=Key"></script>
<script type="text/javascript">
var markers = [
<asp:Repeater ID="rptMarkers" runat="server">
<ItemTemplate>
{
"title": '<%# Eval("Name") %>',
"lat": '<%# Eval("Latitude") %>',
"lng": '<%# Eval("Longitude") %>',
"description": '<%# Eval("Description") %>'
}
</ItemTemplate>
<SeparatorTemplate>
,
</SeparatorTemplate>
</asp:Repeater>
];
</script>
<script type="text/javascript">
window.onload = function () {
LoadMap();
};
var prm = Sys.WebForms.PageRequestManager.getInstance();
if (prm != null) {
prm.add_endRequest(function (sender, e) {
if (sender._postBackSettings.panelsToUpdate != null) {
LoadMap();
}
});
};
function LoadMap() {
var mapOptions = {
center: new google.maps.LatLng(markers[0].lat, markers[0].lng),
zoom: 8,
mapTypeId: google.maps.MapTypeId.ROADMAP
};
var infoWindow = new google.maps.InfoWindow();
var map = new google.maps.Map(document.getElementById("dvMap"), mapOptions);
for (i = 0; i < markers.length; i++) {
var data = markers[i]
var myLatlng = new google.maps.LatLng(data.lat, data.lng);
var marker = new google.maps.Marker({
position: myLatlng,
map: map,
title: data.title
});
(function (marker, data) {
google.maps.event.addListener(marker, "click", function (e) {
infoWindow.setContent(data.description);
infoWindow.open(map, marker);
});
})(marker, data);
}
};
</script>
<asp:ScriptManager ID="ScriptManager1" runat="server">
</asp:ScriptManager>
<asp:UpdatePanel ID="UpdatePanel1" runat="server" UpdateMode="Conditional">
<ContentTemplate>
<asp:Timer ID="Timer1" runat="server" Interval="30000" OnTick="Timer1_Tick">
</asp:Timer>
<div id="dvMap" style="width: 500px; height: 500px">
</div>
</ContentTemplate>
<Triggers>
<asp:AsyncPostBackTrigger ControlID="Timer1" EventName="Tick" />
</Triggers>
</asp:UpdatePanel>
</form>
</body>
</html>
Following is my code behind:
protected void Page_Load(object sender, EventArgs e)
{
if (!this.IsPostBack)
{
DataTable dt = this.GetData("SELECT top 2 Name,lat as Latitude,long as Longitude,id as Description FROM tma_dump2 where city='Delhi' and id>10 ORDER BY Id");
rptMarkers.DataSource = dt;
rptMarkers.DataBind();
}
}
protected void Timer1_Tick(object sender, EventArgs e)
{
DataTable dt = this.GetData("SELECT top 2 Name,lat as Latitude,long as Longitude,id as Description FROM tma_dump2 where city='Mumbai' and id>10 ORDER BY Id");
rptMarkers.DataSource = dt;
rptMarkers.DataBind();
UpdatePanel1.Update();
}
private DataTable GetData(string query)
{
string conString = ConfigurationManager.ConnectionStrings["TMA"].ConnectionString;
SqlCommand cmd = new SqlCommand(query);
using (SqlConnection con = new SqlConnection(conString))
{
using (SqlDataAdapter sda = new SqlDataAdapter())
{
cmd.Connection = con;
sda.SelectCommand = cmd;
using (DataTable dt = new DataTable())
{
sda.Fill(dt);
return dt;
}
}
}
}
It's evident that i am doing something horribly wrong. Please enlighten me.
What I have tried:
I tried my best to resolve this case but didn't get any clue from here.
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