2
Good morning, everyone,
I’m developing a C# web application that uses GMAPS to add comments to addresses.
I have a page on which the user inserts comments (and the page captures latitude and longitude) and saves to a Mysql database.
I found a nice tutorial that shows how to insert the points through a JSON document.
The problem is that in the tutorial’s JSON file, the latitude and longitude are added manually in JSON and in my case, I need to add points from the database.
Follows my code:
index aspx.
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="index.aspx.cs" Inherits="testeMapa.index" %>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
<link rel="stylesheet" type="text/css" href="css/estilo.css">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div id="mapa" style="height: 500px; width: 700px">
</div>
<script src="js/jquery.min.js"></script>
<!-- Maps API Javascript -->
<script src="http://maps.googleapis.com/maps/api/js?sensor=false"> </script>
<!-- Caixa de informação -->
<script src="js/infobox.js"></script>
<!-- Agrupamento dos marcadores -->
<script src="js/markerclusterer.js"></script>
<!-- Arquivo de inicialização do mapa -->
<script src="js/mapa.js"></script>
<asp:GridView ID="gvTeste" runat="server"></asp:GridView>
<asp:Label ID="lblteste" runat="server" Text="Label"></asp:Label>
</form>
</body>
</html>
index.aspx.Cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Text;
using System.Web.Services;
using System.Web.Script.Services;
using System.Web.Script.Serialization;
using System.Data;
using MySql.Data.MySqlClient;
using System.Reflection;
namespace testeMapa
{
public partial class index : System.Web.UI.Page
{
private MySqlConnection mConn;
private MySqlDataAdapter mAdapter;
private DataSet mDataSet;
protected void Page_Load(object sender, EventArgs e)
{
mConn = new MySqlConnection("server=192.185.176.186;User Id= ***** ;database=ondli012_buscmob; password=****");
mConn.Open();
MySqlCommand com = new MySqlCommand();
com.Connection = mConn;
com.CommandText = "Select idDado, latitudeEnd, longitudeEnd, enderecoDado from inserirDados";
MySqlDataReader dr = com.ExecuteReader();
DataTable dt = new DataTable();
dt.Load(dr);
}
[WebMethod]
static public string Carregar(DataTable dt )
{
JavaScriptSerializer jsSerializer = new JavaScriptSerializer();
List<Dictionary<string, object>> parentRow = new List<Dictionary<string, object>>();
Dictionary<string, object> childRow;
foreach (DataRow row in dt.Rows)
{
childRow = new Dictionary<string, object>();
foreach (DataColumn col in dt.Columns)
{
childRow.Add(col.ColumnName, row[col]);
}
parentRow.Add(childRow);
}
var pontos = jsSerializer.Serialize(parentRow);
return pontos;
}
}
}
And finally the Javascript:
var map;
var idInfoBoxAberto;
var infoBox = [];
var markers = [];
function initialize() {
var latlng = new google.maps.LatLng(-18.8800397, -47.05878999999999);
var options = {
zoom: 5,
center: latlng,
mapTypeId: google.maps.MapTypeId.ROADMAP
};
map = new google.maps.Map(document.getElementById("mapa"), options);
}
initialize();
function abrirInfoBox(id, marker) {
if (typeof (idInfoBoxAberto) == 'number' && typeof (infoBox[idInfoBoxAberto]) == 'object') {
infoBox[idInfoBoxAberto].close();
}
infoBox[id].open(map, marker);
idInfoBoxAberto = id;
}
function carregarPontos() {
$.ajax({
type: 'POST',
url: '/index.aspx/Carregar',
contentType: 'application/json; charset=utf-8',
dataType: 'json',
success: function (pontos) {
var latlngbounds = new google.maps.LatLngBounds();
$(pontos).each(function (i) {
var lat = pontos[i].latitudeEnd;
var long = pontos[i].longitudeEnd;
var endereco = pontos[i].enderecoDado;
var idDados = pontos[i].idDado;
var marker = new google.maps.Marker({
position: new google.maps.LatLng(lat, long),
title: "Meu ponto personalizado! :-D",
icon: 'img/marcador.png'
});
var myOptions = {
content: "<p>" + endereco + "</p>",
pixelOffset: new google.maps.Size(-150, 0)
};
infoBox[idDados] = new InfoBox(myOptions);
infoBox[idDados].marker = marker;
infoBox[idDados].listener = google.maps.event.addListener(marker, 'click', function (e) {
abrirInfoBox(idDados, marker);
});
markers.push(marker);
latlngbounds.extend(marker.position);
});
var markerCluster = new MarkerClusterer(map, markers);
map.fitBounds(latlngbounds);
} });
}
carregarPontos();
I tested the return of JSON and it stays like this:
[
{
"idDado": 11,
"latitudeEnd": "-22.8668838",
"longitudeEnd": "-43.307824100000005",
"enderecoDado": "R. Limeira, 16 - Tomás Coelho, Rio de Janeiro - RJ, 21370- 460, Brasil"
},
{
"idDado": 10,
"latitudeEnd": "-22.9501581",
"longitudeEnd": "-43.18422179999999",
"enderecoDado": "Botafogo - Botafogo, Rio de Janeiro - RJ, Brasil"
},
{
"idDado": 24,
"latitudeEnd": "-20.1940458",
"longitudeEnd": "-44.935004400000025",
"enderecoDado": "R. Limeira - Floresta, Divinópolis - MG, Brasil"
},
{
"idDado": 17,
"latitudeEnd": "-22.878278665030688",
"longitudeEnd": "-43.2732975914364",
"enderecoDado": "Av. Pastor Martin Luther King Junior, 4667-4713 - Inhaúma, Rio de Janeiro - RJ, Brasil"
}
]
I copy this return and put it in a file. JSON and change the javascript, it works perfectly... but if I try to get JSON created dynamically, does not load the points..
Someone has some light?
Thanks in advance!
Already tried parse the data and transform it into an array?
– Marconi