目录

一、Picker 选择器

1.1、数组对象处理

1.2、每个选项颜色设置

二、滚动分页加载列表

三、Calendar 日历(可选范围限制)

四、input值过滤

官网：Vant 2 - Mobile UI Components built on Vue

一、Picker 选择器

官网示例数据：

columns: ['杭州', '宁波', '温州', '绍兴', '湖州', '嘉兴', '金华', '衢州'],

1.1、数组对象处理

  一般接口返回格式是数组对象，在项目中van-picker的数组如果含有对象，则需要包含 text 属性用于显示的文本、value 属性作为选择器的值，如果接口返回的结果中属性名和我们期望的不一样，就自己map设置一下。

<template>
      <van-field
        v-model="segmentSign.text"
        clearable
        label="所属列表"
        placeholder="点击选择所属列表"
      >
        <template #right-icon>
          <van-icon name="arrow" @click="showPicker = true" />
        </template>
      </van-field>
    <!-- 复杂数组的选择器 -->
    <van-popup v-model="showPicker" position="bottom" :lazy-render="false">
      <van-picker
        show-toolbar
        :columns="segmentList"
        @confirm="onConfirm"
        @cancel="showPicker = false"
      >
      </van-picker>
    </van-popup>
</template>
<script>
  data() {
      showPicker: false,
      segmentList: [],
      segmentSign: {},
    };
  },
  methods: {
    onConfirm(val) {
      this.segmentSign = val;
      this.showPicker = false;
    },
    async getDepartList() {
      let res = await findDepartList();
      if (res.data.code == 200) {
        let data = res.data.result || [];
        if (data.length > 0) {
          let result = data.map((item) => {
            let res = {};
            res.text = item.deptName;
            res.value = item.deptId;
            res.teacherId = item.teacherId;
            return res;
          });
          this.segmentList = result;
          if (this.segmentList && this.segmentList.length > 0) {
            this.segmentSign = this.segmentList[0];
          }
        }
      } else {
        Toast(res.data.message);
      }
    },
}
</script>

1.2、每个选项颜色设置

#option="option"里面放个div，是为了让每一行的样式可以自己设置，也可以加更多内容！

<template>
        <van-picker
          :columns="columns"
          ref="van_picker"
          :default-index="StatusVal.status"
          @change="PickerChange"
        >
          <template #option="option">
            <div
              style="display: flex; flex-direction: column; align-items: center"
            >
              <div :style="'color:' + colorType(option.id)">
                {{ option.value }}
              </div>
            </div>
          </template>
        </van-picker>
</template>
<script>
  data() {
      columns: [
        { id: 0, value: "出勤" },
        { id: 1, value: "迟到" },
        { id: 2, value: "旷课" },
        { id: 3, value: "早退" },
        { id: 4, value: "请假" },
      ],
      StatusVal: {},
      selectId: "",
    };
  },
  methods: {
    // picker选项改变
    PickerChange(val, index) {
      this.selectId = index.id;
    },
    colorType(index) {
      const colors = ["#6BC25E", "#F0A55C", "#E77575", "#F0A55C", "#6FBFF1"];
      return colors[index] || "";
    },
}
</script>

列表默认值属性 :default-index结合setIndexes才能将默认值修改自己想要的结果

      this.$nextTick(() => {
        this.$refs.van_picker.setIndexes([this.StatusVal.status]); // 注意这里是数组[索引值]
      });

二、滚动分页加载列表

  页面初始化时加载初始列表方法，随着页面向下滚动和刷新，页面递增，此时发送请求，获取下一页数据，这个适用于vue2，只需要换成自己的接口和循环组件即可！

<template>
          <!-- 下拉刷新 -->
          <van-pull-refresh v-model="isLoading" @refresh="onRefresh">
            <!-- 列表 -->
            <van-list
              v-if="valueLists.length > 0"
              v-model="loading"
              :finished="finished"
              finished-text="没有更多了"
              :immediate-check="false"
              offset="50"
              @load="onLoad"
            >
              <group-items
                v-for="(item, index) in valueLists"
                :key="index"
                :infoItems="item"
              ></group-items>
            </van-list>
            <van-empty
              image-size="150"
              v-else
              :image="
                require('../../../../static/images/courseSelection/wu.png')
              "
              description="暂无数据"
              class="empty"
            />
            <!-- end -->
          </van-pull-refresh>
</template>
<script>
  data() {
    return {
      finished: false,
      loading: false,
      isLoading: false,
      valueLists: [],
      pageNum: 1,
      pageSize: 10,
      pages: 0,
    };
  },
  created() {
    this.findRecordPageFun();
  },
  methods: {
    // 下拉刷新
    onRefresh() {
      // 重置页码
      this.pageNum = 1;
      // 重置刷新状态
      this.finished = false;
      this.loading = false;
      // 请求列表
      this.findRecordPageFun();
    },
    // 加载更多
    onLoad() {
      this.findRecordPageMore();
    },
    // 获取初始列表
    findRecordPageFun() {
      let params = {
        pageNo: this.pageNum,
        pageSize: this.pageSize,
      };
      this.invokeApi(findRecordPage, params).then((res) => {
        if (res.data.code == 200) {
          this.valueLists = res && res.data.result.records;
          this.pages = res && res.data.result.pages;
          if (this.isLoading) return (this.isLoading = false);
        } else {
          Toast(res.data.message);
          this.valueLists = [];
          this.pages = 0;
          this.pageNum = 1;
          this.finished = false;
          this.loading = false;
        }
      });
    },
    async findRecordPageMore() {
      // 请求页码+1
      let finePage = this.pageNum + 1;
      // 判断页码极限
      if (finePage > this.pages) return (this.finished = true);
      let params = {
        pageNo: this.pageNum,
        pageSize: this.pageSize,
      };
      this.invokeApi(findRecordPage, params).then((res) => {
        if (res.data.code == 200) {
          this.pages = res.data.result.pages;
          this.valueLists.push(...res.data.result.records);
          this.pageNum = finePage;
          this.loading = false;
        } else {
          Toast(res.data.message);
          this.valueLists = [];
          this.pages = 0;
          this.pageNum = 1;
          this.finished = false;
          this.loading = false;
        }
      });
    },
}
</script>

三、Calendar 日历(可选范围限制)

<template>
      <van-field
        v-model="times"
        readonly
        clearable
        placeholder="点击选择日期"
        class="custom-field"
      >
        <template #right-icon>
          <van-icon name="arrow" @click="showDate = true" />
        </template>
      </van-field>
      <!-- 日历 -->
      <van-calendar
        v-model="showDate"
        @confirm="dateConfirm"
        color="#1989fa"
        :min-date="minDate"
        :max-date="maxDate"
      />
</template>
<script>
  data() {
    return {
      times:'',
      showDate: false,
      minDate: this.getStartOfWeek(new Date()),
      maxDate: this.getEndOfWeek(new Date()),
    };
  },
  methods: {
    getStartOfWeek(date) {
      const day = date.getDay();
      const diff = date.getDate() - day + (day === 0 ? -6 : 1);
      return new Date(date.setDate(diff));
    },
    getEndOfWeek(date) {
      const startOfWeek = this.getStartOfWeek(date);
      const endOfWeek = new Date(startOfWeek);
      endOfWeek.setDate(endOfWeek.getDate() + 6);
      return endOfWeek;
    },
    dateConfirm(time) {
      const date = new Date(time);
      const year = date.getFullYear();
      const month = (date.getMonth() + 1).toString().padStart(2, "0");
      const day = date.getDate().toString().padStart(2, "0");
      this.times = `${year}-${month}-${day}`;
      this.showDate = false;
    },
}
</script>

场景介绍：

点击field栏，选择本周时间，选中后将值回显（minDate和maxDate在方法里限制了范围，在确定事件里整理格式，然后赋值给field栏绑定的值）

四、input值过滤

为啥不用  v-model.trim="xx",因为它只能过滤头部和尾部的空格，而不能过滤中间的，所以自己再写了个方法。

          <van-search
            v-model="searchValue"
            placeholder="请输入姓名"
            show-action
            @input="trimLR"
          >
            <template #action>
              <div @click="getCheckList">搜索</div>
            </template>
          </van-search>
    // 过滤空格
    trimLR() {
      this.searchValue = this.searchValue.replace(/\s+/g, "");
    },