javascript - Setting zoom level doesn't work on Google Map -


i'm learning web developing , i'm using javascript show google map. here code:

<!doctype html> <html> <head>     <title>google map</title>     <script type="text/javascript" src="http://maps.googleapis.com/maps/api/js?sensor=false"></script>     <script type="text/javascript">         function loaddata(callback) {             var xobj = new xmlhttprequest();             xobj.overridemimetype("application/json");             xobj.onreadystatechange = function () {                 if (xobj.readystate == 4 && xobj.status == "200")                     callback(xobj.responsetext);             }             xobj.open("get", "data.json", true);             xobj.send(null);         }          window.onload = function () {             loaddata(function(response) {                 markers = json.parse(response);              var mapoptions = {                 center: new google.maps.latlng(markers[0].lat, markers[0].lng),                 zoom: 2,                 maptypeid: google.maps.maptypeid.roadmap             };             var infowindow = new google.maps.infowindow();             var latlngbounds = new google.maps.latlngbounds();             var map = new google.maps.map(document.getelementbyid("map-canvas"), mapoptions);              (var = 0; < markers.length; i++) {                 var data = markers[i]                 var mylatlng = new google.maps.latlng(data.lat, data.lng);                 var marker = new google.maps.marker({                     position: mylatlng,                     map: map,                     title: data.title                 });                 (function (marker, data) {                     google.maps.event.addlistener(marker, "click", function (e) {                         infowindow.setcontent("<div style = 'width:200px;min-height:40px'>" + data.title + "</div>");                         infowindow.open(map, marker);                     });                 })(marker, data);                 latlngbounds.extend(marker.position);             }             var bounds = new google.maps.latlngbounds();             map.setcenter(latlngbounds.getcenter());             map.fitbounds(latlngbounds);             });         }     </script>     <style>     /* style settings google map */     #map-canvas {         width : 1200px; /* map width */         height: 600px;  /* map height */     }     </style> </head> <body>      <!-- dislay google map here -->     <div id='map-canvas' ></div> </body> </html>

i'm trying change zoom level, doesn't work. tried set, example, 6 or 8 doesn't change. reason?

the .fitbounds method resets viewport , zoom level not taken in account. here minimal working example: https://jsfiddle.net/pdnsown1/1/.

if comment line containing call .fitbounds , change zoom level, see applied. however, if leave line uncommented, zoom level not taken in account.

(see https://developers.google.com/maps/documentation/javascript/reference#map)

edit: limit map position given bounds, have listen drag event , reset position within bounds whenever user drags outside of them (see https://stackoverflow.com/a/9103195/3452708).

i updated fiddle show how: https://jsfiddle.net/pdnsown1/2/.


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