Leaflet changing Marker color

Question

Is there a way to randomly change marker-colors in native Leaflet  I m using svg elements which could be styled  I know that it is possible with mapbox js EDIT  To clarify what I intend to do  If you add markers to the map via a doubleclick or something it should have random colors  To achieve this I wanted to use svg icons for the markers to style them  This is my code      myIcon   L icon         iconUrl   quot icon 33997 svg quot         iconAnchor  pinAnchor              newMarker   L marker lat  long           icon  myIcon

User · Answer

Here is the SVG of the icon    lt svg width  28  height  41  xmlns  http   www w3 org 2000 svg  xmlns xlink  http   www w3 org 1999 xlink  gt    lt defs gt     lt linearGradient id  b  gt      lt stop stop-color   2e6c97  offset  0   gt      lt stop stop-color   3883b7  offset  1   gt     lt  linearGradient gt     lt linearGradient id  a  gt      lt stop stop-color   126fc6  offset  0   gt      lt stop stop-color   4c9cd1  offset  1   gt     lt  linearGradient gt     lt linearGradient y2  -0 004651  x2  0 498125  y1  0 971494  x1  0 498125  id  c  xlink href   a   gt     lt linearGradient y2  -0 004651  x2  0 415917  y1  0 490437  x1  0 415917  id  d  xlink href   b   gt    lt  defs gt    lt g gt     lt title gt Layer 1 lt  title gt     lt rect id  svg 1  fill   fff  width  12 625  height  14 5  x  411 279  y  508 575   gt     lt path stroke  url  d   id  svg 2  stroke-linecap  round  stroke-width  1 1  fill  url  c   d  m14 095833 1 55c-6 846875 0 -12 545833 5 691 -12 545833 11 866c0 2 778 1 629167 6 308 2 80625 8 746l9 69375 17 872l9 647916 -17 872c1 177083 -2 438 2 852083 -5 791 2 852083 -8 746c0 -6 175 -5 607291 -11 866 -12 454166 -11 866zm0 7 155c2 691667 0 017 4 873958 2 122 4 873958 4 71s-2 182292 4 663 -4 873958 4 679c-2 691667 -0 017 -4 873958 -2 09 -4 873958 -4 679c0 -2 588 2 182292 -4 693 4 873958 -4 71z   gt     lt path id  svg 3  fill  none  stroke-opacity  0 122  stroke-linecap  round  stroke-width  1 1  stroke   fff  d  m347 488007 453 719c-5 944 0 -10 938 5 219 -10 938 10 75c0 2 359 1 443 5 832 2 563 8 25l0 031 0 031l8 313 15 969l8 25 -15 969l0 031 -0 031c1 135 -2 448 2 625 -5 706 2 625 -8 25c0 -5 538 -4 931 -10 75 -10 875 -10 75zm0 4 969c3 168 0 021 5 781 2 601 5 781 5 781c0 3 18 -2 613 5 761 -5 781 5 781c-3 168 -0 02 -5 75 -2 61 -5 75 -5 781c0 -3 172 2 582 -5 761 5 75 -5 781z   gt    lt  g gt   lt  svg gt

User · Answer

Since you are working with svg elements you could feed your leaflet marker s icon with L divIcon s html property instead of using iconUrl from L icon to link your image   L marker latlng        icon  L divIcon           className   ship-div-icon           html    lt svg gt     lt  svg gt             addTo map     Then use CSS fill property to color your svg shape  It could be useful to add a class es to svg s path s to have precise control   lt svg      gt       lt g gt           lt path class  ship-icon        gt       lt  g gt           lt  svg gt    At the end  as I also needed to randomly change the marker color I changed directly the path s fill property at the time of creating the marker  var pathFillColor        Math random   0xFFFFFF lt  lt 0  toString 16    L marker latlng        icon  L divIcon           className   ship-div-icon           html    lt svg      gt  lt g gt  lt path fill    pathFillColor          gt   lt  g gt  lt  svg gt             addTo map

User · Answer

A cheap way to change the Leaflet marker colour is to use the CSS filter property  Give the icon an extra class and then change its colour in the stylesheet    lt style gt  img huechange   filter  hue-rotate 120deg      lt  style gt   lt script gt  var marker   L marker  y  x   addTo map   marker  icon classList add  huechange     lt  script gt    and this will produce a red marker  alter the value given to hue-rotate to alter the colour

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You can also use the Google Charts API to get icons  just change  abcdef  with the hexadecimal color you want   Examples    Color   abcdef     URL  http   chart apis google com chart chst d map pin letter amp chld  E2 80 A2 abcdef amp chf a s ee00FFFF Output    Color   e85141     URL  http   chart apis google com chart chst d map pin letter amp chld  E2 80 A2 e85141 amp chf a s ee00FFFF Output    Color   2ecc71     URL  http   chart apis google com chart chst d map pin letter amp chld  E2 80 A2 2ecc71 amp chf a s ee00FFFF Output

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Bind in the icons from this site  https   github com pointhi leaflet-color-markers Detailed how-to information included on the website  Edit  Use the code below to add a marker icon and just replace the link to the one with the color of your choice   i e  marker-icon-2x-green png to some other image  var greenIcon   new L Icon     iconUrl   https   raw githubusercontent com pointhi leaflet-color-markers master img marker-icon-2x-green png     shadowUrl   https   cdnjs cloudflare com ajax libs leaflet 0 7 7 images marker-shadow png     iconSize   25  41     iconAnchor   12  41     popupAnchor   1  -34     shadowSize   41  41       L marker  51 5  -0 09    icon  greenIcon   addTo map

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adding to  tutts excelent answer  I modified it to this       includes a caption - where you can use FontAwesome icons or alike      var myCustomColour     334455d0      d0 - gt  alpha value     lat   5 5      lon   5 5   var caption            lt i class  fa fa-eye    gt   or  abc  or         size   10        size of the marker     border   2       border thickness  var markerHtmlStyles           background-color      myCustomColour            width      size   3    px        height      size   3    px        display  block        left      size   -1 5    px        top      size   -1 5    px        position  relative        border-radius      size   3    px     size   3    px 0        transform  rotate 45deg         border    border  px solid  FFFFFF           var captionStyles          transform  rotate -45deg         display block        width      size   3    px        text-align  center        line-height      size   3    px            var icon   L divIcon       className   color-pin-    myCustomColour replace                   on another project this is needed   0  size 2   border 2      iconAnchor   border  size 2   border 2         labelAnchor   - size 2   0       popupAnchor   0  - size 3   border        html    lt span style      markerHtmlStyles      gt  lt span style    captionStyles    gt    caption     lt  span gt  lt  span gt        var marker   L marker  lat  lon    icon  icon    addTo mymap     and the ES6 version  like  tutts     I am using it with vue-leaflet   x000D   x000D     caption could be    lt i class  fa fa-eye    gt    x000D  function makeMarkerIcon color  caption    x000D   let myCustomColour   color    d0   x000D   x000D   let size   10        size of the marker x000D    border   2       border thickness x000D   x000D   let markerHtmlStyles     x000D    background-color    myCustomColour   x000D    width    size   3 px  x000D    height    size   3 px  x000D    display  block  x000D    left    size   -1 5 px  x000D    top    size   -1 5 px  x000D    position  relative  x000D    border-radius    size   3 px   size   3 px 0  x000D    transform  rotate 45deg   x000D    border    border px solid  FFFFFF  x000D       x000D   x000D   let captionStyles     x000D    transform  rotate -45deg   x000D    display block  x000D    width    size   3 px  x000D    text-align  center  x000D    line-height    size   3 px  x000D       x000D   x000D   let icon   L divIcon   x000D    className   color-pin-    myCustomColour replace           x000D    iconAnchor   border  size 2   border 2   x000D    labelAnchor   - size 2   0   x000D    popupAnchor   0  - size 3   border    x000D   x000D    html    lt span style    markerHtmlStyles   gt  lt span style    captionStyles   gt   caption        lt  span gt  lt  span gt   x000D       x000D   x000D   return icon  x000D    x000D   x000D  var marker   L marker  lat  lon    icon  makeMarkerIcon   123456d0          x000D   addTo mymap   x000D   x000D   x000D

User · Answer

In addition to the way  guillermogfer describe  this is the way to do it if you don t want to paste your whole svg code into your react component  You can just place your svg code in a separate file and load it into your code file as a React Component like this   import   ReactComponent as SatelliteIcon   from     assets icons satellite svg     After you do this you can just use your svg as if it is a react component  so like this     lt SatelliteIcon className  svg-icon light-blue    gt    What we ended up doing is define some standard svg colors that are used in our application so we can pass them as a class in order to change the color of the svg  If you don t know the color beforehand or don t have a defined set of colors you can dynamically overwrite the properties in your svg file by using the style attribute  something like this     lt SatelliteIcon style    stroke   black      gt    In order for this to work it is important that the attributes you are trying to overwrite are set on the  element in your svg and not on the individual paths   In order to get this svg icon to display in leaflet you can use the divIcon as described by  guillermogfer  However  because the html attribute of the divIcon doesn t understand jsx we need to convert it to string first   L divIcon       className   div-icon       html  ReactDOMServer renderToString           lt SatelliteIcon className  svg-icon light-blue    gt

User · Answer

Try the Leaflet awesome-markers lib -- it allows you to set colors and other styles

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So this is one of the top hits in Google for styling Leaflet Icon  but it didn t have a solution that worked without third parties  and I was having this problem in React as we needed dynamic colours for our routes and icons   The solution I came up with was to use Leaflet DivIcon html attribute  it allows you to pass a string which is evaluated into a DOM element   So for example I created a marker style follows     const myCustomColour     583470   const markerHtmlStyles       background-color    myCustomColour     width  3rem    height  3rem    display  block    left  -1 5rem    top  -1 5rem    position  relative    border-radius  3rem 3rem 0    transform  rotate 45deg     border  1px solid  FFFFFF   const icon   Leaflet divIcon     className   my-custom-pin     iconAnchor   0  24     labelAnchor   -6  0     popupAnchor   0  -36     html    lt span style    markerHtmlStyles     gt        Change background-color in markerHtmlStyles to your custom colour and you re good to go

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1  Add the marker 2  find the backgroundcolor attribute for the css and change it   Here it is   JS  var myIcon   L divIcon         className   my-div-icon         iconSize   5  5          var marker   L marker  50 -20    icon  myIcon   addTo map       marker valueOf    icon style backgroundColor    green     or any color

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Html code for adding map  lt div id  quot map quot  style  quot height 480px  width 360px  quot  gt  lt  div gt   css for loading map  leaflet-div-icon       background-image  url  http   cloudmade com images layout cm-logo png       Logic for changing marker colour  var map   L map  map   setView  51 5  -0 09   13            L marker  51 49  -0 09   addTo map       bindPopup  Demo CSS3 popup   lt br gt  Easily customizable              const myCustomColour     5f93ed           const markerHtmlStyles         background-color    myCustomColour       width  15px      height  15px      font-size 15px      text-align center      display  block              function thing ct        return L divIcon           className   quot box quot           iconAnchor   12  25           labelAnchor   -6  0           popupAnchor   0  -15           html    lt span style  quot   markerHtmlStyles  quot   gt M lt  span gt                    L marker  51 51  -0 09         icon  thing  quot hello quot      addTo map       bindPopup  divIcon CSS3 popup   lt br gt  Supposed to be easily stylable

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I found the SVG marker icon to be best one yet  It is very flexible and allows any color you like  You can customize the entire icon without much of a hassle   function createIcon markerColor            Code ommitted           return new L DivIcon SVGIcon               color  markerColor              iconSize   15 30               circleRatio  0 35

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In R  use the addAwesomeMarkers   function  Sample code producing red marker    leaflet     gt   addTiles     gt   addAwesomeMarkers lng   -77 03654  lat   38 8973  icon   awesomeIcons icon    ion-ionic   library    ion   markerColor    red      Link for ion icons  http   ionicons com

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Ahh an event listener and change the icon through setIcon   method   createdMarker on  dblclick   function evt             var myIcon   L icon               iconUrl   res marker-icon-red png               shadowUrl   res marker-shadow png                      this setIcon myIcon

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Write a function which  given a color  or any other characteristics   returns an SVG representation of the desired icon   Then  when creating the marker  reference this function with the appropriate parameter s

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Leaflet Markers are stored as files unlike other objects  like Polylines  etc    If you want your own markers  you can find The official Leaflet Tutorial that explains how to do it   EDIT    After reading this conversation with the main developer I searched for the marker SVG and here it is   With this you should be able to color the marker the way you want and randomly set their color   EDIT AGAIN    You can use MakiMarkers to set the color of a marker and use this extension to make some random stuffs   It s simple and well explained

[leaflet] Leaflet changing Marker color

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