CODEWITHSUNDEEP
javascriptcssgoogle-maps-api-3
Rounin
Rounin

Reputation: 29463

Changing the color of Google Maps API marker labels after map initialization

I have a Google Maps API initialization function, where the Marker label color (for an array of markerPins) is set to transparent:

    markerPins[i] = new google.maps.Marker({

        position: position,
        map: map,
        optimized: false,
        icon: myPin,
        label: {
          color: 'transparent', // <= HERE
          fontSize: '11px',
          fontWeight: '900',
          text: 'Example Label'
        }
    });

This works. So far, so good.

At a later point (following a user action etc.) I would like to change the Marker label color.

I have written the following function:

// CHANGE MARKER LABEL COLOR
function changeMarkerLabelColor(labelColor) {

    for (let i = 0; i < markerPins.length; i++ ) {

        markerPins[i].label.color = labelColor;

    }
}

And it does work. But seemingly only as the map is being initialised.

How is it possible to get and set the Marker label color after the map has initialized?

I am happy to deploy a javascript approach, a CSS approach, or any other approach - but I've been searching and testing and experimenting for hours and so far come up empty-handed.

Upvotes: 2

Views: 4318

Answers (1)

geocodezip
geocodezip

Reputation: 161334

There is no documented label property of a marker. Use the (documented) .setLabel and .getLabel functions:

function changeMarkerLabelColor(labelColor) {
  for (let i = 0; i < markerPins.length; i++ ) {
    var label = markerPins[i].getLabel();
    label.color = labelColor;
    markerPins[i].setLabel(label);
  }
}

proof of concept fiddle

screenshot of resulting map after setTimeout runs

code snippet:

var locations = [
  { position: {lat: 37.4419, lng: -122.1419}}, 
  { position: {lat: 37.4529598, lng: -122.1817252}},
  { position: {lat: 37.4688273, lng: -122.141075}},
  ];
var markerPins = [];

function initialize() {
  var map = new google.maps.Map(
    document.getElementById("map_canvas"), {
      center: new google.maps.LatLng(37.4419, -122.1419),
      zoom: 13,
      mapTypeId: google.maps.MapTypeId.ROADMAP
    });
  for (var i = 0; i < locations.length; i++) {
    markerPins[i] = new google.maps.Marker({

      position: locations[i].position,
      map: map,
      optimized: false,
      label: {
        color: 'transparent', // <= HERE
        fontSize: '11px',
        fontWeight: '900',
        text: 'Example Label'
      }
    });
  }
  setTimeout(function() {
    changeMarkerLabelColor("blue");
  }, 5000)
}
google.maps.event.addDomListener(window, "load", initialize);

function changeMarkerLabelColor(labelColor) {
  for (let i = 0; i < markerPins.length; i++) {
    var label = markerPins[i].getLabel();
    label.color = labelColor;
    markerPins[i].setLabel(label);

  }
}
html,
body,
#map_canvas {
  height: 100%;
  width: 100%;
  margin: 0px;
  padding: 0px
}
<script src="https://maps.googleapis.com/maps/api/js?key=AIzaSyCkUOdZ5y7hMm0yrcCQoCvLwzdM6M8s5qk"></script>
<div id="map_canvas"></div>

Upvotes: 7

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