import { createApp } from 'vue';
import { Cascader } from 'vant';

const app = createApp();
app.use(Cascader);

<van-field
  v-model="fieldValue"
  is-link
  readonly
  label="Area"
  placeholder="Select Area"
  @click="show = true"
/>
<van-popup v-model="show" round position="bottom">
  <van-cascader
    v-model="cascaderValue"
    title="Select Area"
    :options="options"
    @close="show = false"
    @finish="onFinish"
  />
</van-popup>

import { ref } from 'vue';

export default {
  setup() {
    const show = ref(false);
    const fieldValue = ref('');
    const cascaderValue = ref('');
    const options = [
      {
        text: 'Zhejiang',
        value: '330000',
        children: [{ text: 'Hangzhou', value: '330100' }],
      },
      {
        text: 'Jiangsu',
        value: '320000',
        children: [{ text: 'Nanjing', value: '320100' }],
      },
    ];
    const onFinish = ({ selectedOptions }) => {
      show.value = false;
      fieldValue.value = selectedOptions.map((option) => option.text).join('/');
    };

    return {
      show,
      options,
      onFinish,
      fieldValue,
      cascaderValue,
    };
  },
};

<van-cascader
  v-model="cascaderValue"
  title="Select Area"
  :options="options"
  active-color="#ee0a24"
  @close="show = false"
  @finish="onFinish"
/>

<van-field
  v-model="fieldValue"
  is-link
  readonly
  label="Area"
  placeholder="Select Area"
  @click="show = true"
/>
<van-popup v-model="show" round position="bottom">
  <van-cascader
    v-model="cascaderValue"
    title="Select Area"
    :options="options"
    @close="show = false"
    @change="onChange"
    @finish="onFinish"
  />
</van-popup>

import { ref } from 'vue';
import { closeToast, showLoadingToast } from 'vant';

export default {
  setup() {
    const show = ref(false);
    const fieldValue = ref('');
    const cascaderValue = ref('');
    const options = ref([
      {
        text: 'Zhejiang',
        value: '330000',
        children: [],
      },
    ]);
    const onChange = ({ value }) => {
      if (
        value === options.value[0].value &&
        options.value[0].children.length === 0
      ) {
        showLoadingToast('Loading...');
        // mock data request
        setTimeout(() => {
          options.value[0].children = [
            { text: 'Hangzhou', value: '330100' },
            { text: 'Ningbo', value: '330200' },
          ];
          closeToast();
        }, 1000);
      }
    };
    const onFinish = ({ selectedOptions }) => {
      show.value = false;
      fieldValue.value = selectedOptions.map((option) => option.text).join('/');
    };

    return {
      show,
      options,
      onFinish,
      fieldValue,
      cascaderValue,
    };
  },
};

<van-cascader
  v-model="code"
  title="Select Area"
  :options="options"
  :field-names="fieldNames"
/>

import { ref } from 'vue';

export default {
  setup() {
    const code = ref('');
    const fieldNames = {
      text: 'name',
      value: 'code',
      children: 'items',
    };
    const options = [
      {
        name: 'Zhejiang',
        code: '330000',
        items: [{ name: 'Hangzhou', code: '330100' }],
      },
      {
        name: 'Jiangsu',
        code: '320000',
        items: [{ name: 'Nanjing', code: '320100' }],
      },
    ];

    return {
      code,
      options,
      fieldNames,
    };
  },
};

<van-cascader v-model="code" title="Select Area" :options="options">
  <template #options-top="{ tabIndex }">
    <div class="current-level">Current level is {{ tabIndex + 1 }}</div>
  </template>
</van-cascader>

<style>
  .current-level {
    font-size: 14px;
    padding: 16px 16px 0;
    color: var(--van-gray-6);
  }
</style>

import { ref } from 'vue';

export default {
  setup() {
    const code = ref('');
    const options = [
      {
        name: 'Zhejiang',
        code: '330000',
        items: [{ name: 'Hangzhou', code: '330100' }],
      },
      {
        name: 'Jiangsu',
        code: '320000',
        items: [{ name: 'Nanjing', code: '320100' }],
      },
    ];

    return {
      code,
      options,
    };
  },
};

import type { CascaderProps, CascaderOption, CascaderFieldNames } from 'vant';