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Refreshing Markers Postions on Map

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  • Refreshing Markers Postions on Map

    Hi,

    On a map component, I run a javascript to place several markers from a list control linked to a database table.

    Periodically, every minute, the same javascript is automatically run to update the locations of the markers as per the list updated values.

    The javascript first removes all markers using removeMarkersGroup, adds each marker in the group, and then places the markers group on the map using viewMarkersGroup function.

    My problem is, whenever user has either zoomed in or out and the script is run again, viewMarkersGroup function will resize and center the map to show all the updated markers to be in view.

    Is there a way to retain the position, zoom level, and scale of the map while redrawing (placing) the markers again.

    Thanks,
    Sami

  • #2
    Re: Refreshing Markers Postions on Map

    Sami,

    You'll need to save your map object settings before your viewMarkerGroups function... and then restore your settings after your new markers are set.

    Wherever, you're setting the new markers... do something like this...

    Code:
    var mapObj = {dialog.object}.getControl('map1');
    var currZoom = mapObj.map.zoom;
    var centerLat = mapObj.map.center.lat();
    var centerLng = mapObj.map.center.lng();
    {dialog.Object}.ajaxCallback('','','convertSeries','');
    
    setTimeout(function(){
    
    	mapObj.setZoom(currZoom);
    	mapObj.setCenter([centerLat,centerLng]);
    
    },5000);
    Here we are getting a pointer to the map object... getting the current zoom level and center location lat and lng. Then I make an ajax callback to set a bunch of markers... which.... as you point out... resets my map... which is what it's supposed to do.

    Then... restore the zoom and center. I wrapped the reset in a setTimeout to give the map time to display after the new markers are set.

    In this case, my ajax callback is returning a Javascript function which then calls viewMarkerGroups... so really... I should put my reset code into that Javascript function and make use of dialog namespace variables... like this...

    Code:
    var mapObj = {dialog.object}.getControl('map1');
    {dialog.Object}.__mapInfo = {};
    {dialog.Object}.__mapInfo.currZoom = mapObj.map.zoom;
    {dialog.Object}.__mapInfo.mapCenter = [mapObj.map.center.lat(),mapObj.map.center.lng()];
    And then... when I'm ready to reset my map...

    Code:
    var mapObj = {dialog.object}.getControl('map1');
    mapObj.setZoom({dialog.Object}.__mapInfo.currZoom);
    mapObj.setCenter({dialog.Object}.__mapInfo.mapCenter);

    Comment


    • #3
      Re: Refreshing Markers Postions on Map

      Thanks a lot David for the valuable tip .....

      Will give it a try and let you know how it went ...

      Cheers,
      Sami

      Comment


      • #4
        Re: Refreshing Markers Postions on Map

        Hi David,

        Thanks again for your help ... I tried out your code ... and it worked beautifully as intended ...

        Much appreciated ....

        Sami

        Comment

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