_handleRangeMousedownTouchstart(e) {
      // Set indicator value
      $(this.value).html(this.$el.val());

      this._mousedown = true;
      this.$el.addClass('active');

      if (!$(this.thumb).hasClass('active')) {
        this._showRangeBubble();
      }

      if (e.type !== 'input') {
        let offsetLeft = this._calcRangeOffset();
        $(this.thumb)
          .addClass('active')
          .css('left', offsetLeft + 'px');
      }
    }
Handle Range Mousedown and Touchstart
@param {Event} e