Solved

Google Maps Count Marker Script

Posted on 2013-02-06
2
2,346 Views
Last Modified: 2013-02-07
Hi EE,

I've been following https://developers.google.com/maps/articles/phpsqlsearch_v3 and i've got it working great.

However i just want to count all the markers that have been created on the map regardless of zoom level.

i tried using MarkerManager but everything i try it fails.

MarkerManager

Can anyone help me modify the script below to pass the count of the markers to div id Count

<html xmlns="http://www.w3.org/1999/xhtml">
  <head>
    <meta http-equiv="content-type" content="text/html; charset=utf-8"/>
    <meta name="viewport" content="initial-scale=1.0, user-scalable=no" />
    <title>Google Maps AJAX + mySQL/PHP Example</title>
    <script src="http://maps.googleapis.com/maps/api/js?sensor=false"
            type="text/javascript"></script>
    <script type="text/javascript">
    //<![CDATA[
    var map;
    var markers = [];
    var infoWindow;
    var locationSelect;

    function load() {
      map = new google.maps.Map(document.getElementById("map"), {
        center: new google.maps.LatLng(40, -100),
        zoom: 4,
        mapTypeId: 'roadmap',
        mapTypeControlOptions: {style: google.maps.MapTypeControlStyle.DROPDOWN_MENU}
      });
      infoWindow = new google.maps.InfoWindow();

      locationSelect = document.getElementById("locationSelect");
      locationSelect.onchange = function() {
        var markerNum = locationSelect.options[locationSelect.selectedIndex].value;
        if (markerNum != "none"){
          google.maps.event.trigger(markers[markerNum], 'click');
        }
      };
   }

   function searchLocations() {
     var address = document.getElementById("addressInput").value;
     var geocoder = new google.maps.Geocoder();
     geocoder.geocode({address: address}, function(results, status) {
       if (status == google.maps.GeocoderStatus.OK) {
        searchLocationsNear(results[0].geometry.location);
       } else {
         alert(address + ' not found');
       }
     });
   }

   function clearLocations() {
     infoWindow.close();
     for (var i = 0; i < markers.length; i++) {
       markers[i].setMap(null);
     }
     markers.length = 0;

     locationSelect.innerHTML = "";
     var option = document.createElement("option");
     option.value = "none";
     option.innerHTML = "See all results:";
     locationSelect.appendChild(option);
   }

   function searchLocationsNear(center) {
     clearLocations();

     var radius = document.getElementById('radiusSelect').value;
     var searchUrl = 'phpsqlsearch_genxml.php?lat=' + center.lat() + '&lng=' + center.lng() + '&radius=' + radius;
     downloadUrl(searchUrl, function(data) {
       var xml = parseXml(data);
       var markerNodes = xml.documentElement.getElementsByTagName("marker");
       var bounds = new google.maps.LatLngBounds();
       for (var i = 0; i < markerNodes.length; i++) {
         var name = markerNodes[i].getAttribute("name");
         var address = markerNodes[i].getAttribute("address");
         var distance = parseFloat(markerNodes[i].getAttribute("distance"));
         var latlng = new google.maps.LatLng(
              parseFloat(markerNodes[i].getAttribute("lat")),
              parseFloat(markerNodes[i].getAttribute("lng")));

         createOption(name, distance, i);
         createMarker(latlng, name, address);
         bounds.extend(latlng);
       }
       map.fitBounds(bounds);
       locationSelect.style.visibility = "visible";
       locationSelect.onchange = function() {
         var markerNum = locationSelect.options[locationSelect.selectedIndex].value;
         google.maps.event.trigger(markers[markerNum], 'click');
       };
      });
    }

    function createMarker(latlng, name, address) {
      var html = "<b>" + name + "</b> <br/>" + address;
      var marker = new google.maps.Marker({
        map: map,
        position: latlng
      });
      google.maps.event.addListener(marker, 'click', function() {
        infoWindow.setContent(html);
        infoWindow.open(map, marker);
      });
      markers.push(marker);
    }

    function createOption(name, distance, num) {
      var option = document.createElement("option");
      option.value = num;
      option.innerHTML = name + "(" + distance.toFixed(1) + ")";
      locationSelect.appendChild(option);
    }

    function downloadUrl(url, callback) {
      var request = window.ActiveXObject ?
          new ActiveXObject('Microsoft.XMLHTTP') :
          new XMLHttpRequest;

      request.onreadystatechange = function() {
        if (request.readyState == 4) {
          request.onreadystatechange = doNothing;
          callback(request.responseText, request.status);
        }
      };

      request.open('GET', url, true);
      request.send(null);
    }

    function parseXml(str) {
      if (window.ActiveXObject) {
        var doc = new ActiveXObject('Microsoft.XMLDOM');
        doc.loadXML(str);
        return doc;
      } else if (window.DOMParser) {
        return (new DOMParser).parseFromString(str, 'text/xml');
      }
    }

    function doNothing() {}

    //]]>
  </script>
  </head>

  <body style="margin:0px; padding:0px;" onload="load()">
    <div>
     <input type="text" id="addressInput" size="10"/>
    <select id="radiusSelect">
      <option value="25" selected>25mi</option>
      <option value="100">100mi</option>
      <option value="200">200mi</option>
    </select>

    <input type="button" onclick="searchLocations()" value="Search"/>
    </div>
    <div><select id="locationSelect" style="width:100%;visibility:hidden"></select></div>
    <div id="map" style="width: 100%; height: 80%"></div>
<div id="Count></div>
  </body>
</html>

Open in new window


Many Thanks in Advance.....

Ross
0
Comment
Question by:Ross Turner
2 Comments
 
LVL 38

Accepted Solution

by:
Tom Beck earned 500 total points
ID: 38859526
EDIT:

Adding this line to the end of your createMarker function should be all you need.
...
          markers.push(marker);
        document.getElementById('Count').innerHTML = markers.length;
    }
0
 
LVL 7

Author Closing Comment

by:Ross Turner
ID: 38863446
Perfect and Simple
0

Featured Post

Courses: Start Training Online With Pros, Today

Brush up on the basics or master the advanced techniques required to earn essential industry certifications, with Courses. Enroll in a course and start learning today. Training topics range from Android App Dev to the Xen Virtualization Platform.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

International Data Corporation (IDC) prognosticates that before the current the year gets over disbursing on IT framework products to be sent in cloud environs will be $37.1B.
Building a website can seem like a daunting task to the uninitiated but it really only requires knowledge of two basic languages: HTML and CSS.
The viewer will learn how to dynamically set the form action using jQuery.
The viewer will receive an overview of the basics of CSS showing inline styles. In the head tags set up your style tags: (CODE) Reference the nav tag and set your properties.: (CODE) Set the reference for the UL element and styles for it to ensu…

776 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question