demarches-normaliennes/app/assets/javascripts/api_carto/lib/easy-button.js

if (typeof L != 'undefined') {
  L.Control.EasyButtons = L.Control.extend({
      options: {
          position: 'topleft',
          title: '',
          intendedIcon: 'fa-circle-o'
      },

      onAdd: function () {
          var container = L.DomUtil.create('div', 'leaflet-bar leaflet-control');

          this.link = L.DomUtil.create('a', 'leaflet-bar-part', container);
          this._addImage()
          this.link.href = '#';

          L.DomEvent.on(this.link, 'click', this._click, this);
          this.link.title = this.options.title;

          return container;
      },

      intendedFunction: function(){ alert('no function selected');},

      _click: function (e) {
          L.DomEvent.stopPropagation(e);
          L.DomEvent.preventDefault(e);
          this.intendedFunction();
          this.link.blur();
      },

      _addImage: function () {
          var extraClasses = this.options.intendedIcon.lastIndexOf('fa', 0) === 0 ? ' fa fa-lg' : ' glyphicon';

          var icon = L.DomUtil.create('i', this.options.intendedIcon + extraClasses, this.link);
          icon.id = this.options.id;
      }
  });

  L.easyButton = function( btnIcon , btnFunction , btnTitle , btnMap , btnId) {
    var newControl = new L.Control.EasyButtons();

    if (btnIcon) newControl.options.intendedIcon = btnIcon;
    if (btnId) newControl.options.id = btnId;

    if ( typeof btnFunction === 'function'){
      newControl.intendedFunction = btnFunction;
    }

    if (btnTitle) newControl.options.title = btnTitle;

    if ( btnMap === '' ){
      // skip auto addition
    } else if ( btnMap ) {
      btnMap.addControl(newControl);
    } else {
      map.addControl(newControl);
    }
    return newControl;
  };
}