I am trying to make a site which uses different Fusion Tables. There is a dropdown menu which has several states. Each state has its own Fusion Table
I would like to make it so that when you pick a state, the map loads up that state’ Fusion Table.
How do I do that?
Below is my JavaScript code so far (filename is ‘script.js’). Below that is the HTML code.
When I change the state via dropdown, I’d like the map to load up the Fusion Table map of the state in the dropdown. Right now, it does not do that.
$(document).ready(function(){
var states = {
'Alabama':'3348442',
'Alaska':'3370522'
};
// SECTION 1: ADDING HTML TO DOM
var bodyDivs = [
'<div id="map-canvas" />',
'<div id="address-form-container" />',
'<div id="state-select-container"><select id="state-select" /></div>'
];
var addressContainer = [
'<span id="form pretext"> Enter a city name or address </span>',
'<input id="address" type="textbox" />',
'<input type="button" value="Search" />'
];
// Append the body to <html>
$('html').append('<body />');
for (var i=0; i<bodyDivs.length; i++){
$('body').append(bodyDivs[i]);
};
// Append the address form to <body>
for (var i=0; i<addressContainer.length; i++){
$('div#address-form-container').append(addressContainer[i]);
};
// Append state names to the body
for (var state in states){
$('select').append('<option value='+state+'>'+state+'</option>');
};
// DONE ADDING HTML TO DOM
// SECTION 2: Create the Google map with the coordinates and add the Fusion Tables layer to it. Plus, it zooms and centers to whatever state is selected.
var geocoder;
var gmap;
var locationColumn = "'geometry'";
var condition = "'Median income (dollars)'>0";
var selectedState = document.getElementById("state-select").value;
var tableId = states[selectedState];
var mapOptions = {
mapTypeId: google.maps.MapTypeId.ROADMAP
};
function initialize(){
geocoder = new google.maps.Geocoder(); // This variables is used to automate zooming and centering in this script
gmap = new google.maps.Map(document.getElementById("map-canvas"), mapOptions); // Removing this removes the Google Maps layer, but would keep any layers on top of it
// The Fusion Tables layer variable
var layer = new google.maps.FusionTablesLayer({
query: {
select: locationColumn,
from: tableId,
where: condition
}
});
// This code snippet centers and zooms the map to the selected state.
geocoder.geocode(
{
'address':selectedState
},
function(results,status){
var sw = results[0].geometry.viewport.getSouthWest();
var ne = results[0].geometry.viewport.getNorthEast();
var bounds = new google.maps.LatLngBounds(sw,ne);
gmap.fitBounds(bounds)
}
);
layer.setMap(gmap);
google.maps.event.addDomListener(selectedState,'change',function(){
updateMap(layer,tableId,locationColumn);
});
}
// SECTION 3: Find the address once the button is clicked
$(':button').click(
function codeAddress(){
var address = document.getElementById("address").value;
geocoder.geocode(
{
'address':address
},
function(results,status){
if(status===google.maps.GeocoderStatus.OK){
var addressSW = results[0].geometry.viewport.getSouthWest();
var addressNE = results[0].geometry.viewport.getNorthEast();
var bounds = new google.maps.LatLngBounds(addressSW,addressNE);
gmap.fitBounds(bounds);
} else {
alert("Couldn't find address for the following reason: " + status + ". Sorry about that. Please try another address.");
}
}
);
}
);
function updateMap(layer,tableId,locationColumn){
if (selectedState) {
tableId = states[selectedState];
layer.setOptions({
query: {
select: locationColumn,
from: tableId,
where: condition
}
});
geocoder.geocode(
{
'address':selectedState
},
function(results,status){
var sw = results[0].geometry.viewport.getSouthWest();
var ne = results[0].geometry.viewport.getNorthEast();
var bounds = new google.maps.LatLngBounds(sw,ne);
gmap.fitBounds(bounds)
}
);
}
}
google.maps.event.addDomListener(window, 'load', initialize);
});
CSS:
#map-canvas {
height: 800px;
width: 1000px;
}
HTML code:
<html>
<head>
<meta charset="utf8">
<title>TESTING THE MAPS</title>
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js"></script>
<script type="text/javascript" src="http://maps.google.com/maps/api/js?sensor=false"></script>
<script type="text/javascript" src="public/js/script.js"></script>
</head>
</html>
EDIT: Links to the HTML, CSS, and JS files—
http://speedy.sh/xRkZF/maptest.html
http://speedy.sh/zSt5p/script.js
http://speedy.sh/uCPxZ/style.css
You have hardcoded selectedState, but you need to get the current value when the dropdown changes.
Modify the change-listener to this:
google.maps.event.addDomListener(document.getElementById('state-select'), 'change', function(){ updateMap(layer,this.value,locationColumn); });Now the 2nd argument passed to updateMap will be the selected state from the dropdown.
Also modify updateMap, change the name of the 2nd argument to selectedState:
function updateMap(layer,selectedState,locationColumn){
//function code may stay as it is
}
Everything should work fine now.