docs: function (newValue) {
              var gaugeSpanIndex = this.showLabel ? 1 : 0;
              var barEl = this.getDom().childNodes[gaugeSpanIndex].firstChild;
              var calcValue = this.__calculateBarWidth(newValue);
              if (barEl !== null && calcValue !== null && calcValue != -1) {
                  barEl.style.width = calcValue + "%";
              }
              barEl = null;
          }