code: function () {
          L.DomUtil.empty(this._container);
          var legends = this.options.legends;
  
          if (!legends) return;
  
          legends.forEach(function(legend) {
              if (!legend.elements) return;
              var elements = legend.elements;
  
              var className = 'legend-block';
  
              if (this.options.detectStretched) {
                  if (elements.length === 3  && elements[0].label !== '' && elements[1].label === '' && elements[2].label !== ''){
                      legend.type = 'stretched';
                  }
              }
  
              if (legend.type === 'stretched') {
                  className += ' legend-stretched';
              }
  
              var block = L.DomUtil.create('div', className, this._container);
  
              if (this.options.collapseSimple && elements.length == 1 && !elements[0].label){
                  this._addElement(elements[0].imageData, legend.name, block);
                  return;
              }
  
              if (legend.name) {
                  var header = L.DomUtil.create('h4', null, block);
                  L.DomUtil.create('div', 'caret', header);
                  L.DomUtil.create('span', null, header).innerHTML = legend.name;
  
                  L.DomEvent.on(header, 'click', function() {
                      if (L.DomUtil.hasClass(header, 'closed')) {
                          L.DomUtil.removeClass(header, 'closed');
                      }
                      else {
                          L.DomUtil.addClass(header, 'closed');
                      }
                  }, this);
              }
              var elementContainer = L.DomUtil.create('div', 'legend-elements', block);
  
              elements.forEach(function (element) {
                  this._addElement(element.imageData, element.label, elementContainer);
              }, this);
          }, this);
      }
docs: render this.options.entries