code: function (target, e) {
              e.preventDefault();
              var x = e.pageX || e.originalEvent.touches && e.originalEvent.touches[0].pageX;
              if (e.button === 2) {
                  return;
              }
  
              this.current_plugin = this.plugin_count;
              this.target = target;
  
              this.is_click = true;
              this.coords.x_gap = this.$cache.rs.offset().left;
              this.coords.x_pointer = +(x - this.coords.x_gap).toFixed();
  
              this.force_redraw = true;
              this.calc();
  
              this.$cache.line.trigger("focus");
          }
docs: Mousedown or touchstart
  for other slider elements, like diapason line
  
  @param target {String}
  @param e {Object} event object