Develop Reference

how to load vb.net variable to javascript

I'm trying to add google maps to my website, but instead of fixing a latitude and longitude for the location, I would like to be able to load the values from database. How do I get a variable from vb.net and pass it to javascript? I've tried:
<% Response.Write("<script>
function initialize() {
var myLatlng = new google.maps.LatLng(1.123456, 1.123456);
var mapOptions = {
zoom: 16,
center: myLatlng,
mapTypeId: google.maps.MapTypeId.ROADMAP
}
var map = new google.maps.Map(document.getElementById('map-canvas'), mapOptions);
var marker = new google.maps.Marker({
position: myLatlng,
map: map,
title: 'KH Automotive Location'
});
}
google.maps.event.addDomListener(window, 'load', initialize);
</script>")%>
and
new google.maps.LatLng(<%=latitude%>, <%=longitude%>);
Please help. Thanks

Sometimes, when I need to make absolutely sure (like with translated/localized strings) that the content comes across, I'll write it out to a hidden DIV somewhere on the page (or a hidden INPUT).
<div style='display:none' id='my_data'>stuffstuffstuff</div>
Then I just read the contents of the DIV (or INPUT, whatever I used). Slap a "runat=server" in it, and be able to write to it from your code-behind.

Should be able to write it in:
<% Response.Write("..
..
var myLatlng = new google.maps.LatLng(" & latitude & ", " & longitude & ");
..
")%>

Different marker for each location in Google Maps JavaScript API v3

Noob here, trying to do something simple-yet-complicated. On this page I have succeeded in placing a red 52 of a certain size where I want it. I have done this by making my own changes to a no doubt familiar-looking code sample from the Google Developers site:
function initialize() {
var mapOptions = {
zoom: 12,
center: new google.maps.LatLng(-38.153470, 145.141425)
}
var map = new google.maps.Map(document.getElementById('map-canvas'),
mapOptions);
var image = 'http://pollbludger.0catch.com/numbers/alp-52-07.png';
var myLatLng = new google.maps.LatLng(-38.148594, 145.126124);
var beachMarker = new google.maps.Marker({
position: myLatLng,
map: map,
icon: image
});
}
google.maps.event.addDomListener(window, 'load', initialize);
What I want to do now is add nine other markers at different points on the map, each different in some way from all the others. Like my red 52, each marker I propose to use has its own PNG stored at pollbludger.0catch.com. Can I just do this by coding each marker sequentially, rather than have it go through a loop?

You need use the property "icon" with "url" property and change the new coordinates in "position". use icons with the size of 32x32.
If you do not know how to get the positions use this example and copy the values lat,lng
var beachMarker = new google.maps.Marker({
position: myLatLng,
map: map,
icon : {
url: 'img/yourimageurl.png',//full path of your image
scaledSize: new google.maps.Size(30,40)//this control the size of your icon
}
});

How to mark a place using google map

I'm trying to set a contact page in which I display google's map to indicate the place of a meet. I'm currently using using these codes:
js
(function(){
document.getElementById('map_canvas').style.display="block";
var myOptions = {
zoom: 14,
center: new google.maps.LatLng(0.0, 0.0)
}
map = new google.maps.Map(document.getElementById("map_canvas"), myOptions);
})();
html
<script type="application/javascript" src="/js/google-map.js">
<div id="map_canvas" style="width:80%; height: 400px; margin:auto;"></div>
The problem is that I couldn't be able to mark the indicated place like in google map to precise to the user the indicated place. Any brilliant idea, please?

First you need to define the Latitude and Longitude of the mark
var myLatlng = new google.maps.LatLng(-25.363882,131.044922);
Then you need to add a marker:
var marker = new google.maps.Marker({
position: myLatlng,
map: map,
title: 'Hello World!'
});
Take a look at
https://developers.google.com/maps/documentation/javascript/examples/marker-simple?hl=es

Hyperlink Google Maps Marker to Coordinates

Is there a way to hyperlink a custom marker on google maps marker to its coordinates on Google Maps itself? In this case link to LatLng. Also, is there a way to open it in a new tab using target="_blank" or javascript with the same effect?
function initialize() {
var mapOptions = {
zoom: 14,
center: new google.maps.LatLng(-29.528000, 31.194881)
}
var map = new google.maps.Map(document.getElementById('ContactMap'),
mapOptions);
var image = '/Assets/Images/Pages/Marker.png';
var myLatLng = new google.maps.LatLng(-29.528000, 31.194881);
var beachMarker = new google.maps.Marker({
position: myLatLng,
map: map,
icon: image
});
}
google.maps.event.addDomListener(window, 'load', initialize);

A real hyperlink is not possible, but of course you may set up a click-listener to achieve a similar behaviour:
google.maps.event.addListener(beachMarker,'click',function(){
window.open('https://maps.google.com/maps?q=' +
this.getPosition().toUrlValue() +
'&z='+this.getMap().getZoom(),'google');
});

Google custom Icon not loading

I am trying to load a custom icon for Google Maps API v3. The code I have is as follows:
$(function(){
function initialize() {
var mapOptions = {
center: new google.maps.LatLng(42.2542586, -83.8873974),
zoom: 10
};
var map = new google.maps.Map(document.getElementById("map-canvas"),
mapOptions);
}
google.maps.event.addDomListener(window, 'load', initialize);
$('.valley').on('click', function(){
var myLatlng = new google.maps.LatLng(42.000, -83.0073974);
var mapOptions = {
zoom: 14,
center: myLatlng
}
var map = new google.maps.Map(document.getElementById("map-canvas"), mapOptions);
var iconMarker = 'pin2.jpg'
var marker = new google.maps.Marker({
position: myLatlng,
animation: google.maps.Animation.DROP,
icon: iconMarker,
map: map,
title:"Hello"
});
});
});
The following script is in the 'application.html.erb' file (i've taken out my apikey)
<script type="text/javascript"
src="https://maps.googleapis.com/maps/api/js?key=APIKEY&sensor=false"></script>
Pretty straight forward and the actual map loads, but for some reason the rails app is not finding the .jpgfor the icon. I've placed it in various locations, currently it is in the root folder. For some reason it is trying to load the file as a text/html file instead of an image. I replaced the image with another image that is loading properly on the web page, and I still get a 404 with the browser trying to load it as an text/html
Here is the error in the console

Try with:
var iconMarker = '/assets/pin2.jpg';