小程式中多滑桿的實作程式碼

不言原創: 2018-09-11 17:22:582904瀏覽

這篇文章帶給大家的內容是關於小程式中多滑桿的實現程式碼，有一定的參考價值，有需要的朋友可以參考一下，希望對你有幫助。

最近在用原生的程式碼開發小程序，需要用到多滑塊的slider，但是官方的api只支援單滑塊，所以就在原來的基礎上草草的寫了一個。有什麼不足的地方還請大家多多指教，想封裝成組件的也可自行封裝，我這就不講了。 ;

話不多說，上程式碼：

html:

<view class=&#39;sliderHCon&#39;>
  <view class=&#39;showMoney&#39;>
    <text class=&#39;MoneyValue&#39;>￥{{leftShowValue}}</text>
    <text class=&#39;MoneyValue&#39;>￥{{rightShowValue}}</text>
  </view>

  <view class=&#39;twoSlider&#39;>
    <slider class=&#39;slider-left&#39; min=&#39;{{Min}}&#39; max=&#39;{{Max}}&#39; value=&#39;{{leftValue}}&#39; activeColor=&#39;#ccc&#39; backgroundColor=&#39;#ccc&#39; block-size=&#39;{{blockSize}}&#39; step=&#39;{{step}}&#39; bindchanging="leftChange" rightChange=&#39;leftChange&#39;>
      <em class=&#39;slider-bg&#39; style=&#39;left:{{setSliderLeftX}};width:{{setSliderWidthX}}&#39;></em>
    </slider>
    <slider class=&#39;slider-right&#39; min=&#39;{{Min}}&#39; max=&#39;{{Max}}&#39; value=&#39;{{rightValue}}&#39; activeColor=&#39;#ccc&#39; backgroundColor=&#39;#ccc&#39; block-size=&#39;{{blockSize}}&#39; step=&#39;{{step}}&#39; bindchanging="rightChange" bindchange=&#39;rightChange&#39;/>
  </view>
</view>

css

.sliderHCon {
  height: 250rpx;
  width: 100%;
  margin: auto;
  display: flex;
  justify-content: center;
  align-items: center;
  flex-direction: column;
}

.MoneyValue {
  font-size: 30rpx;
  text-align: center;
  color: #999;
  margin-top: 15rpx;
}

.showMoney text {
  margin-right: 30rpx;
}

.twoSlider {
  width: 100%;
  height:100px;
  display: flex;
  flex-direction: row;
  justify-content: center;
  align-items: center;
  position: relative;
}
.slider-left,.slider-right{position: absolute;left:0;right:0;}
.slider-bg{position: absolute;top:50%;margin-top:-1px;left:0;width:100%;height:2px;background: blue;z-index: 9;}

data: {
      blockSize:20,
      step:10,
      Min: 0, //最小值
      Max: 1000, //最大值
      leftValue: 0, //左边滑块默认值
      rightValue: 1000, //右边滑块默认值
      leftShowValue: 0, //界面显示左边滑块默认值
      rightShowValue: 1000, //界面显示右边滑块默认值
      leftWidth: &#39;50&#39;, //左边滑块可滑动长度：百分比
      rightWidth: &#39;50&#39;, //右边滑块可滑动长度：百分比
      sliderWidth:0, // slider的宽度；
      setSliderLeftX: 0, // 设置的sliderp的left
      setSliderWidthX: 0// 设置的sliderp的width
    },

onLoad(options) {
      var query = wx.createSelectorQuery(); // 如果是封装的组件的话，这边请注意写法不同哦；
      query.select(&#39;.slider-left&#39;).boundingClientRect((rect) => {        
        this.setData({
          sliderWidth: rect.width,
          setSliderLeftX: (rect.width / this.data.Max * this.data.leftValue) + this.data.blockSize/2 + &#39;px&#39;,
          setSliderWidthX: rect.width / this.data.Max * (this.data.rightValue - this.data.leftValue) - this.data.blockSize + &#39;px&#39;,
        })
        
      }).exec();
        
    },

 // 左边滑块滑动的值
  leftChange(e){
    
    var that = this;
    that.setData({
      leftValue: e.detail.value //设置左边当前值
    })
    this.setSliderBgColor(e,&#39;left&#39;);
  },
  // 右边滑块滑动的值
  rightChange: function (e) {
    var that = this;
    that.setData({
      rightValue: e.detail.value,
    })
    this.setSliderBgColor(e, &#39;right&#39;);
  },

  setSliderBgColor(e, type){
      if (type == &#39;left&#39;) { // 左边
        if (this.data.leftValue < this.data.rightValue) {
          console.log(&#39;拖左不超右边&#39;);
          this.setData({ 
            leftShowValue: e.detail.value,
          })
          this.setData({ 
            rightShowValue: this.data.rightValue,
          })
        } else {
          console.log(&#39;拖左超右边&#39;);
          this.setData({ 
            leftShowValue: this.data.rightValue,
          })
          this.setData({ 
            rightShowValue: e.detail.value,
          })
        }
      } else { // 右边
        if (this.data.leftValue < this.data.rightValue) {
          console.log(&#39;拖右不超右边&#39;);
          this.setData({ 
            rightShowValue: e.detail.value,
          })
          this.setData({
            leftShowValue: this.data.leftValue,
          })
        } else {
          console.log(&#39;拖右超右边&#39;)
          this.setData({ 
            leftShowValue: e.detail.value,
          })
          this.setData({ 
            rightShowValue: this.data.leftValue,
          })
        }
      }


     const v = this.data.sliderWidth / this.data.Max 
      
      if (v * (this.data.rightShowValue - this.data.leftShowValue) - this.data.blockSize >= 0) {
        this.setData({
          setSliderLeftX: (v * this.data.leftShowValue) + this.data.blockSize / 2 + &#39;px&#39;,
          setSliderWidthX: v * (this.data.rightShowValue - this.data.leftShowValue) - this.data.blockSize + &#39;px&#39;,
        })
       // console.log(1)
      } else {
        this.setData({
          setSliderLeftX: (v * this.data.leftShowValue) + this.data.blockSize / 2 + &#39;px&#39;,
          setSliderWidthX: 0 + &#39;px&#39;,
        })
     
      }
    
   
  }

小程式中多滑桿的實作程式碼

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