Marker Clusterer in DevExtreme Mobile - mobile

Question

I'm developing an application in DevExtreme Mobile. In application, I use DXMap in this application. How can I use the marker clusterer structure in DevExtreme Mobile App?

Answer 1

You can use Google Maps Marker Clusterer API to create and manage per-zoom-level clusters for a large number of DevExtreme dxMap markers. Here is an example:
 dxMap Marker Clusterer
This example is based on the approach described in the Google Too Many Markers! article
Here is sample code:
$("#dxMap").dxMap({
zoom: 3,
width: "100%",
height: 800,
onReady: function (s) {
var map = s.originalMap;
var markers = [];
for (var i = 0; i < 100; i++) {
var dataPhoto = data.photos[i];
var latLng = new google.maps.LatLng(dataPhoto.latitude, dataPhoto.longitude);
var marker = new google.maps.Marker({
position: latLng
});
markers.push(marker);
}
var markerCluster = new MarkerClusterer(map, markers);
}
});

Answer 2

The kry is to use the google maps api. I did it for my app, here how.
This the html, very simple:
<div data-options="dxView : { name: 'map', title: 'Punti vendita', pane: 'master', secure:true } ">
<div data-bind="dxCommand: { id: 'back', behavior: 'back', type: 'back', visible: false }"></div>
<div data-options="dxContent : { targetPlaceholder: 'content' } ">
<div style="width: 100%; height: 100%;">
<div data-bind="dxMap:options"></div> <!--this for the map-->
<div id="large-indicator" data-bind="dxLoadIndicator: {height: 60,width: 60}" style="display:inline;z-index:99;" />
<div data-bind="dxPopover: {
width: 200,
height: 'auto',
visible: visible,
}">
</div>
</div>
</div>
</div>
When the page loads, the app read the gps coordinates:
function handleViewShown() {
navigator.geolocation.getCurrentPosition(onSuccess, onError, options);
jQuery("#large-indicator").css("display", "none"); //this is just a gif to indicate the user to wait the end of the operation
}
If the gps location is correctly read, I save the coordinates (the center of the map):
function onSuccess(position) {
var lat1 = position.coords.latitude;
var lon1 = position.coords.longitude;
center([lat1, lon1]);
}
And these are the options I set to my dxMap:
options: {
showControls: true,
key: { google: "myGoogleApiKey" },
center: center,
width: "100%",
height: "100%",
zoom: zoom,
provider: "google",
mapType: "satellite",
autoAdjust: false,
onReady: function (s) {
LoadPoints();
var map = s.originalMap;
var markers = [];
for (var i = 0; i < MyPoints().length; i++) {
var data = MyPoints()[i];
var latLng = new google.maps.LatLng(data.location[0], data.location[1]);
var marker = createMarker(latLng, data.title, map, data.idimp);
markers.push(marker);
}
var markerCluster = new MarkerClusterer(map, markers, { imagePath: 'images/m' });
}
},
Where MyPoints is populated calling LoadPoints:
function LoadPoints() {
$.ajax({
type: "POST",
async:false,
contentType: "application/json",
dataType: "json",
url: myApiUrl,
success: function (Response) {
var tempArray = [];
for (var point in Response) {
var location = [Response[p]["latitudine"], Response[p]["longitudine"]];
var title = Response[p]["name"] + " - " + Response[p]["city"];
var temp = { title: title, location: location, tooltip: title, onClick: GoToNavigator, idpoint: Response[p]["id"] };
tempArray.push(temp);
}
MyPoints(tempArray);
},
error: function (Response) {
jQuery("#large-indicator").css("display", "none");
var mex = Response["responseText"];
DevExpress.ui.notify(mex, "error");
}
});
}
Note that in the folder Myproject.Mobile/images I included the images m1.png, m2.png, m3.png, m4.png and m5.png.
You can found them here.