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rated 0 times [  16] [ 3]  / answers: 1 / hits: 45010  / 15 Years ago, tue, march 3, 2009, 12:00:00

So, i have the following script to use the google maps API, its all fine, but i need to create a map that has more than one Marker (the balloon shaped icon pointing to something) and i need each of those markers to point on a different area of the map (i.e. different coordinates), how can i do it?



<script type=text/javascript>

function load() {

var map = new GMap2(document.getElementById(map));
var marker = new GMarker(new GLatLng(<%=coordinates%>));

var html=<img src='simplemap_logo.jpg' width='20' height='20'/> +
<%=maptitle%><br/> +
<%=text%>;



map.setCenter(new GLatLng(<%=coordinates%>), <%=zoom%>)
map.setMapType(G_HYBRID_MAP);
map.addOverlay(marker);
map.addControl(new GLargeMapControl());
map.addControl(new GScaleControl());
map.addControl(new GMapTypeControl());


marker.openInfoWindowHtml(html);
}

//]]>
</script>


One more question, if i pass the Script text as a variable, lets say something like:



<script type=text/javascript>
<%=ScriptText%>
</script>


and my <%=ScriptText%> will be a string which i will build and assign its value to a Friend or Public variable called ScriptText, will it still run and work properly? (i am doing this to make my script dynamic and different based on how i build it as a STRING, due to my illiteracy in javascripting ;P)


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 Answers
31

obeattie and gregers are both right. In general, you need to store the marker parameters in some kind of array which you will later use at-least twice:




  1. when adding the overlay to the map

  2. when adding it to a GLatLngBounds object to calculate the center point and zoom level



The array or markers would look like an array of objects, something like:



var latlng1 = [
new GLatLng( 48.1234, -120.1234 ),
new GLatLng( 48.5678, -120.5678 ),
new GLatLng( 48.9101, -120.9112 ),
new GLatLng( 48.1121, -120.1314 ),
new GLatLng( 48.3145, -120.1516 ),
new GLatLng( 48.1617, -120.1718 ),
new GLatLng( 48.1819, -120.1920 ),
new GLatLng( 48.2021, -120.2122 )
];


The code for adding markers would look something similar to:



  // assume that map1 is an instance of a GMap2 object

// #0 -- google maps api requires us to call setCenter first before calling any other operation on the map
map1.setCenter( new GLatLng( 0, 0 ), 0 );

// #1 -- add markers
for ( var i = 0; i < latlng1.length; i++ )
{
var marker = new GMarker( latlng1[ i ] );
map1.addOverlay( marker );
}

// #2a -- calculate center
var latlngbounds = new GLatLngBounds( );
for ( var i = 0; i < latlng1.length; i++ )
{
latlngbounds.extend( latlng1[ i ] );
}

// #2b -- set center using the calculated values
map1.setCenter( latlngbounds.getCenter( ), map1.getBoundsZoomLevel( latlngbounds ) );


As for your question about using server side script inside client side javascript, yes you can mix them together. Judging by your description, i think this is what you need to do:



<script type=text/javascript>
var latlng1 = new Array( );
</script>
<script type=text/javascript>
<%
do until rs.eof
%>
latlng1.push( new GLatLng( parseFloat( '<%= rs( Lat ) %>' ), parseFloat( '<%= rs( Lng ) %>' ) ) );
<%
rs.movenext
loop
%>
</script>


I've posted an article at: http://salman-w.blogspot.com/2009/03/zoom-to-fit-all-markers-polylines-or.html


[#99897] Thursday, February 26, 2009, 15 Years  [reply] [flag answer]
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