微信小程序中添加刻度滑块

新遇到一个需求，希望在选择重量的时候，通过滑块的方式来获取。结合小程序通用组件slider和大佬们的经验，通过css简单实现了一个，做个记录。

• ruler.wxml

<view class='wrapper horizontal-box' id='scale-wrapper'>
  <view>{{weight}}kg</view>
  <view class='weight-wrapper' id='scale-wrapper'>
      <!-- 标尺容器 -->
    <view  class='scale-container'>
      <view class='scale-wrapper' id='scaleWrapper'>
        <view class="slider-active" id="sliderActive" style="width: {{sliderActive}}rpx;"></view>
        <view class='scale-grip-item scale-grip-item-first' style="width:{{single}}rpx;height:14rpx;border-color:{{styles.line}};"> </view>
        <view class='scale-grip'
          wx:for="{{grid}}"
          wx:key="{{index}}"
          style='height:{{h}}rpx;border-color:{{styles.line}};'>
          <view class='scale-grip-item' 
          wx:for-item="it"
          wx:for-index="itx"
          wx:for="{{5}}" 
          wx:key="itx"
          style="width:{{single}}rpx;height:{{itx==4?'33':'14'}}%;border-color:{{styles.line}};"
          ></view>
          <view class='scale-grip-vaule'>{{min+5*(index)}}</view>
        </view>
        <view class='scale-grip scale-grip-last' style='height:{{h}}rpx;border-color:{{styles.line}};'>
          <view class='scale-grip-vaule'>{{max}}</view>
        </view>
      </view>
    </view>
    <view class='weight-slider-bar' style="margin-left: {{sliderActive}}rpx;"></view>
    <slider class='weight-slider' style="margin-left: {{circleWidth}}rpx;"  min='4' max='20' value='{{weight}}' 
      activeColor="#FF6A00" backgroundColor='#F8F8F8' color="#F8F8F8"
      bindchange="chooseWeight" bindchanging="changeingWeight" block-size="28" ></slider>
  </view>
</view>

• ruler.wxss

view,text{
  box-sizing: border-box;
}
.wrapper{
  position: relative;
}
.weight-wrapper{
  position: relative;
}
.horizontal-box .scale-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  
}
.horizontal-box .scroll-wrapper {
  position: relative;
  display: flex;
}
.horizontal-box .zz{
  position: absolute;
  left: 50%;
  top: 0;
  transform: translate(-50%);
  height: 40%;
  width: 2px;
  background-color: #5b73f2;
  z-index: 10;
}
.horizontal-box .scale-wrapper{
  display: flex;
  width: 100%;
  height: 90rpx;
  background: #F8F8F8;
  align-items: flex-end;
  border-radius: 90rpx;
  justify-content: center;
}
.horizontal-box .scale-grip{
  position: relative;
  height: 100rpx;
  display: flex;
  align-items: flex-end;
}
.horizontal-box .scale-grip::before{
  content: "";
  position: absolute;
  bottom: 0;
  border-width: 2rpx;
  border-color: inherit;
  border-style: solid;
  height: 100%;
  transform: translateX(-50%);
  left: 0rpx;
}

.horizontal-box .scale-grip-vaule{
  position: absolute;
  bottom: -20px;
  width: 80rpx;
  height: 30rpx;
  text-align: center;
  transform: translateX(-50%);
}

.horizontal-box .scale-grip-item{
  height: 60%;
  padding-top: 10rpx;
}

.horizontal-box .scale-grip-item:not(:last-child){
  border-right: 2rpx solid #000000;
}
.horizontal-box .scale-grip-item-first{
  height: 60%;
  padding-top: 10rpx;
  border-left: 2rpx solid #000000;
  border-right: none;
}
.horizontal-box .scale-vaule-wrapper{
  position: relative;
  display: flex;
  text-align: center;
}
.horizontal-box .scale-vaule{
  text-align: left;
  width: 180rpx;
}
.horizontal-box .scale-vaule:last-child{
  text-align: right;
}
.horizontal-box .first-scale-value{
  position: absolute;
  left: 0;
  bottom: 0;
  transform: translateX(-50%);
}
.weight-slider {
  width: 576rpx;
  margin: 0rpx;
  position: absolute;
  top: 32rpx;
  opacity: 0.01;
}
.weight-slider-bar {
  position: absolute;
  top: -10rpx;
  width: 18rpx;
  height: 110rpx;
  border: 2rpx solid #D0D0D0;
  background: #FFFFFF;
  box-shadow: 0 8px 20px 0 rgba(0,0,0,0.14);
  border-radius: 10px;
  transform: translateX(-50%);
}
.slider-active {
  position: absolute;
  top: 0;
  left: 0;
  border-top-left-radius: 90rpx;
  border-bottom-left-radius: 90rpx;
  height: 90rpx;
  background: #FF6A00;
}

• ruler.ts

const defaultStyles = {
  line: '#D9D9D9', // 刻度颜色
  fontSize: 16, //字体大小
};

Component({
  attached() {
    // 获取两端宽度
    const query = wx.createSelectorQuery().in(this);
    const that = this;
    query
      .select('.scale-wrapper')
      .boundingClientRect(function(rects) {
        const { width } = rects;
        // 获取两端半圆的宽度
        const circleWidth = width - 16 * 18;
        that.setData({
          circleWidth,
          sliderActive: circleWidth,
        });
      })
      .exec();
  },
  /**
   * 组件的属性列表
   */
  properties: {
    // 最小值
    min: {
      type: Number,
      value: 0,
    },
    //最大值
    max: {
      type: Number,
      value: 100,
    },
    // 每个格子的实际行度 （单位rpx ，相对默认值）
    single: {
      type: Number,
      value: 36,
    },
    styles: {
      type: Object,
      value: defaultStyles,
    },
  },
  data: {
    circleWidth: 0,
    weight: 1,
  },

  ready() {
    this.init();
  },
  methods: {
    init() {
      // 设置默认值
      const min = this.data.min || 0;
      const max = this.data.max || 0;
      const grid = (max - min) / 5;
      const styles = Object.assign(defaultStyles, this.data.styles);
      this.setData({ grid, styles });
    },
    // 选择重量
    chooseWeight(e) {
      const weight = e.detail.value === 4 ? 1 : e.detail.value;
      const { circleWidth } = this.data;
      const sliderActive = weight < 5 ? circleWidth : circleWidth + (weight - 4) * 36;
      this.setData({
        weight,
        sliderActive,
      });
      this.triggerEvent('set-weight', weight);
    },
    // 滑动选择重量
    changeingWeight(e) {
      const { circleWidth } = this.data;
      const weight = e.detail.value === 4 ? 1 : e.detail.value;
      const sliderActive = weight < 5 ? circleWidth : circleWidth + (weight - 4) * 36;
      this.setData({
        weight,
        sliderActive,
      });
      this.triggerEvent('set-weight', weight);
    },
  },
});

• 使用

<weight-ruler min="5" max="20" single="36" bind:set-weight="setWeight"></weight-ruler>