# 一.Cascader

Cascader 级联选择器 (opens new window)

element-plus

packages

components

cascader 【Cascader 级联选择器】

__tests__

cascader.spec.ts

测试用例

import { nextTick } from "vue"
import { mount } from "@vue/test-utils"
import Cascader from "../src/index.vue"

const OPTIONS = [
  {
    value: "zhejiang",
    label: "Zhejiang",
    children: [
      {
        value: "hangzhou",
        label: "Hangzhou",
      },
      {
        value: "ningbo",
        label: "Ningbo",
      },
    ],
  },
]

const AXIOM = "Rem is the best girl"

const TRIGGER = ".el-cascader"
const DROPDOWN = ".el-cascader__dropdown"
const NODE = ".el-cascader-node"
const ARROW = ".el-icon-arrow-down"
const CLEAR_BTN = ".el-icon-circle-close"
const TAG = ".el-tag"
const SUGGESTION_ITEM = ".el-cascader__suggestion-item"
const CHECK_ICON = ".el-icon-check"

const _mount: typeof mount = (options) =>
  mount(
    {
      components: {
        Cascader,
      },
      ...options,
    },
    {
      attachTo: "body",
    }
  )

afterEach(() => {
  document.body.innerHTML = ""
})

describe("Cascader.vue", () => {
  test("toggle popper visible", async () => {
    const handleVisibleChange = jest.fn()
    const wrapper = _mount({
      template: `
       <cascader @visible-change="handleVisibleChange" />
     `,
      methods: {
        handleVisibleChange,
      },
    })
    const trigger = wrapper.find(TRIGGER)
    const dropdown = document.querySelector(
      DROPDOWN
    ) as HTMLDivElement

    await trigger.trigger("click")
    expect(dropdown.style.display).not.toBe("none")
    expect(handleVisibleChange).toBeCalledWith(true)
    await trigger.trigger("click")
    expect(handleVisibleChange).toBeCalledWith(false)
    await trigger.trigger("click")
    document.body.click()
    expect(handleVisibleChange).toBeCalledWith(false)
  })

  test("expand and check", async () => {
    const handleChange = jest.fn()
    const handleExpandChange = jest.fn()
    const wrapper = _mount({
      template: `
       <cascader
         v-model="value"
         :options="options"
         @change="handleChange"
         @expand-change="handleExpandChange"
       />
     `,
      data() {
        return {
          value: [],
          options: OPTIONS,
        }
      },
      methods: {
        handleChange,
        handleExpandChange,
      },
    })
    const trigger = wrapper.find(TRIGGER)
    const dropdown = document.querySelector(
      DROPDOWN
    ) as HTMLDivElement
    const vm = wrapper.vm as any

    await trigger.trigger("click")
    ;(dropdown.querySelector(
      NODE
    ) as HTMLElement).click()
    await nextTick()
    expect(handleExpandChange).toBeCalledWith([
      "zhejiang",
    ])
    ;(dropdown.querySelectorAll(
      NODE
    )[1] as HTMLElement).click()
    await nextTick()
    expect(handleChange).toBeCalledWith([
      "zhejiang",
      "hangzhou",
    ])
    expect(vm.value).toEqual(["zhejiang", "hangzhou"])
    expect(wrapper.find("input").element.value).toBe(
      "Zhejiang / Hangzhou"
    )
  })

  test("with default value", async () => {
    const wrapper = mount(Cascader, {
      props: {
        options: OPTIONS,
        modelValue: ["zhejiang", "hangzhou"],
      },
    })
    await nextTick()
    expect(wrapper.find("input").element.value).toBe(
      "Zhejiang / Hangzhou"
    )
    await wrapper.setProps({
      modelValue: ["zhejiang", "ningbo"],
    })
    expect(wrapper.find("input").element.value).toBe(
      "Zhejiang / Ningbo"
    )
  })

  test("options change", async () => {
    const wrapper = mount(Cascader, {
      props: {
        options: OPTIONS,
        modelValue: ["zhejiang", "hangzhou"],
      },
    })
    await wrapper.setProps({ options: [] })
    expect(wrapper.find("input").element.value).toBe("")
  })

  test("disabled", async () => {
    const handleVisibleChange = jest.fn()
    const wrapper = _mount({
      template: `
       <cascader disabled @visible-change="handleVisibleChange" />
     `,
      methods: {
        handleVisibleChange,
      },
    })
    await wrapper.find(TRIGGER).trigger("click")
    expect(handleVisibleChange).not.toBeCalled()
    expect(
      wrapper.find("input[disabled]").exists()
    ).toBe(true)
  })

  test("custom placeholder", async () => {
    const wrapper = mount(Cascader, {
      props: {
        placeholder: AXIOM,
      },
    })
    expect(
      wrapper.find("input").attributes().placeholder
    ).toBe(AXIOM)
  })

  test("clearable", async () => {
    const wrapper = mount(Cascader, {
      props: {
        options: OPTIONS,
        clearable: true,
        modelValue: ["zhejiang", "hangzhou"],
      },
    })
    const trigger = wrapper.find(TRIGGER)
    expect(wrapper.find(ARROW).exists()).toBe(true)
    await trigger.trigger("mouseenter")
    expect(wrapper.find(ARROW).exists()).toBe(false)
    await wrapper.find(CLEAR_BTN).trigger("click")
    expect(wrapper.find("input").element.value).toBe("")
    expect(
      (wrapper.vm as any).getCheckedNodes().length
    ).toBe(0)
    await trigger.trigger("mouseleave")
    await trigger.trigger("mouseenter")
    await expect(wrapper.find(CLEAR_BTN).exists()).toBe(
      false
    )
  })

  test("show last level label", async () => {
    const wrapper = mount(Cascader, {
      props: {
        options: OPTIONS,
        showAllLevels: false,
        modelValue: ["zhejiang", "hangzhou"],
      },
    })
    await nextTick()
    expect(wrapper.find("input").element.value).toBe(
      "Hangzhou"
    )
  })

  test("multiple mode", async () => {
    const wrapper = _mount({
      template: `
       <cascader
         v-model="value"
         :options="options"
         :props="props"
       />
     `,
      data() {
        return {
          options: OPTIONS,
          props: { multiple: true },
          value: [
            ["zhejiang", "hangzhou"],
            ["zhejiang", "ningbo"],
          ],
        }
      },
    })
    await nextTick()
    const tags = wrapper.findAll(TAG)
    const [firstTag, secondTag] = tags
    expect(tags.length).toBe(2)
    expect(firstTag.text()).toBe("Zhejiang / Hangzhou")
    expect(secondTag.text()).toBe("Zhejiang / Ningbo")
    await firstTag
      .find(".el-tag__close")
      .trigger("click")
    expect(wrapper.findAll(TAG).length).toBe(1)
    expect(wrapper.vm.value).toEqual([
      ["zhejiang", "ningbo"],
    ])
  })

  test("collapse tags", async () => {
    const wrapper = mount(Cascader, {
      props: {
        options: OPTIONS,
        props: { multiple: true },
        collapseTags: true,
        modelValue: [
          ["zhejiang", "hangzhou"],
          ["zhejiang", "ningbo"],
        ],
      },
    })
    await nextTick()
    const [firstTag, secondTag] = wrapper.findAll(TAG)
    expect(firstTag.text()).toBe("Zhejiang / Hangzhou")
    expect(secondTag.text()).toBe("+ 1")
  })

  test("filterable", async () => {
    const wrapper = _mount({
      template: `
       <cascader
         v-model="value"
         :options="options"
         filterable
       />
     `,
      data() {
        return {
          options: OPTIONS,
          value: [],
        }
      },
    })

    const input = wrapper.find("input")
    const dropdown = document.querySelector(DROPDOWN)
    input.element.value = "Ha"
    await input.trigger("input")
    const suggestions = dropdown.querySelectorAll(
      SUGGESTION_ITEM
    ) as NodeListOf<HTMLElement>
    const hzSuggestion = suggestions[0]
    expect(suggestions.length).toBe(1)
    expect(hzSuggestion.textContent).toBe(
      "Zhejiang / Hangzhou"
    )
    hzSuggestion.click()
    await nextTick()
    expect(
      hzSuggestion.querySelector(CHECK_ICON)
    ).toBeTruthy()
    expect(wrapper.vm.value).toEqual([
      "zhejiang",
      "hangzhou",
    ])
    hzSuggestion.click()
    await nextTick()
    expect(wrapper.vm.value).toEqual([
      "zhejiang",
      "hangzhou",
    ])
  })

  test("filterable in multiple mode", async () => {
    const wrapper = _mount({
      template: `
       <cascader
         v-model="value"
         :options="options"
         :props="props"
         filterable
       />
     `,
      data() {
        return {
          options: OPTIONS,
          props: { multiple: true },
          value: [],
        }
      },
    })

    const input = wrapper.find(
      ".el-cascader__search-input"
    )
    const dropdown = document.querySelector(DROPDOWN)
    ;(input.element as HTMLInputElement).value = "Ha"
    await input.trigger("input")
    await nextTick()
    const hzSuggestion = dropdown.querySelector(
      SUGGESTION_ITEM
    ) as HTMLElement
    hzSuggestion.click()
    await nextTick()
    expect(wrapper.vm.value).toEqual([
      ["zhejiang", "hangzhou"],
    ])
    hzSuggestion.click()
    await nextTick()
    expect(wrapper.vm.value).toEqual([])
  })

  test("filter method", async () => {
    const filterMethod = jest.fn((node, keyword) => {
      const { text, value } = node
      return (
        text.includes(keyword) ||
        value.includes(keyword)
      )
    })
    const wrapper = mount(Cascader, {
      props: {
        options: OPTIONS,
        filterable: true,
        filterMethod,
      },
    })

    const input = wrapper.find("input")
    const dropdown = document.querySelector(DROPDOWN)
    input.element.value = "ha"
    await input.trigger("input")
    const hzSuggestion = dropdown.querySelector(
      SUGGESTION_ITEM
    ) as HTMLElement
    expect(filterMethod).toBeCalled()
    expect(hzSuggestion.textContent).toBe(
      "Zhejiang / Hangzhou"
    )
  })
})

src

index.vue

代码

<template>
  <el-popper
    ref="popper"
    v-model:visible="popperVisible"
    manual-mode
    :append-to-body="popperAppendToBody"
    placement="bottom-start"
    :popper-class="
      `el-cascader__dropdown ${popperClass}`
    "
    :popper-options="popperOptions"
    :fallback-placements="[
      'bottom-start',
      'top-start',
      'right',
      'left',
    ]"
    :stop-popper-mouse-event="false"
    transition="el-zoom-in-top"
    :gpu-acceleration="false"
    :effect="Effect.LIGHT"
    pure
    @after-leave="hideSuggestionPanel"
  >
    <template #trigger>
      <div
        v-clickoutside:[popperPaneRef]="
          () => togglePopperVisible(false)
        "
        :class="[
          'el-cascader',
          realSize && `el-cascader--${realSize}`,
          { 'is-disabled': isDisabled },
        ]"
        @click="
          () =>
            togglePopperVisible(
              readonly ? undefined : true
            )
        "
        @keydown="handleKeyDown"
        @mouseenter="inputHover = true"
        @mouseleave="inputHover = false"
      >
        <el-input
          ref="input"
          v-model.trim="inputValue"
          :placeholder="inputPlaceholder"
          :readonly="readonly"
          :disabled="isDisabled"
          :validate-event="false"
          :size="realSize"
          :class="{ 'is-focus': popperVisible }"
          @focus="(e) => $emit('focus', e)"
          @blur="(e) => $emit('blur', e)"
          @input="handleInput"
        >
          <template #suffix>
            <i
              v-if="clearBtnVisible"
              key="clear"
              class="el-input__icon el-icon-circle-close"
              @click.stop="handleClear"
            ></i>
            <i
              v-else
              key="arrow-down"
              :class="[
                'el-input__icon',
                'el-icon-arrow-down',
                popperVisible && 'is-reverse',
              ]"
              @click.stop="togglePopperVisible()"
            ></i>
          </template>
        </el-input>

        <div
          v-if="multiple"
          ref="tagWrapper"
          class="el-cascader__tags"
        >
          <el-tag
            v-for="tag in presentTags"
            :key="tag.key"
            type="info"
            :size="tagSize"
            :hit="tag.hitState"
            :closable="tag.closable"
            disable-transitions
            @close="deleteTag(tag)"
          >
            <span>{{ tag.text }}</span>
          </el-tag>
          <input
            v-if="filterable && !isDisabled"
            v-model.trim="searchInputValue"
            type="text"
            class="el-cascader__search-input"
            :placeholder="
              presentText ? '' : inputPlaceholder
            "
            @input="
              (e) => handleInput(searchInputValue, e)
            "
            @click.stop="togglePopperVisible(true)"
            @keydown.delete="handleDelete"
          />
        </div>
      </div>
    </template>

    <template #default>
      <el-cascader-panel
        v-show="!filtering"
        ref="panel"
        v-model="checkedValue"
        :options="options"
        :props="props"
        :border="false"
        :render-label="$slots.default"
        @expand-change="handleExpandChange"
        @close="togglePopperVisible(false)"
      />
      <el-scrollbar
        v-if="filterable"
        v-show="filtering"
        ref="suggestionPanel"
        tag="ul"
        class="el-cascader__suggestion-panel"
        view-class="el-cascader__suggestion-list"
      >
        <template v-if="suggestions.length">
          <li
            v-for="item in suggestions"
            :key="item.uid"
            :class="[
              'el-cascader__suggestion-item',
              item.checked && 'is-checked',
            ]"
            :tabindex="-1"
            @click="handleSuggestionClick(item)"
          >
            <span>{{ item.text }}</span>
            <i
              v-if="item.checked"
              class="el-icon-check"
            ></i>
          </li>
        </template>
        <slot v-else name="empty">
          <li class="el-cascader__empty-text">
            {{ t("el.cascader.noMatch") }}
          </li>
        </slot>
      </el-scrollbar>
    </template>
  </el-popper>
</template>

<script lang="ts">
import {
  computed,
  defineComponent,
  inject,
  nextTick,
  onMounted,
  onBeforeUnmount,
  Ref,
  ref,
  watch,
} from 'vue'
import { isPromise } from '@vue/shared'
import debounce from 'lodash/debounce'

import ElCascaderPanel, {
  CommonProps,
} from '@element-plus/components/cascader-panel'
import ElInput from '@element-plus/components/input'
import ElPopper from '@element-plus/components/popper'
import ElScrollbar from '@element-plus/components/scrollbar'
import ElTag from '@element-plus/components/tag'
import { elFormKey, elFormItemKey } from '@element-plus/tokens'

import { ClickOutside as Clickoutside } from '@element-plus/directives'
import { useLocaleInject } from '@element-plus/hooks'

import { EVENT_CODE } from '@element-plus/utils/aria'
import { UPDATE_MODEL_EVENT, CHANGE_EVENT } from '@element-plus/utils/constants'
import isServer from '@element-plus/utils/isServer'
import { useGlobalConfig } from '@element-plus/utils/util'
import {
  addResizeListener,
  removeResizeListener,
} from '@element-plus/utils/resize-event'
import { isValidComponentSize } from '@element-plus/utils/validators'
import { Effect, Options } from '@element-plus/components/popper'

import type { ComputedRef, PropType } from 'vue'
import type { ElFormContext, ElFormItemContext } from '@element-plus/tokens'
import type {
  CascaderValue,
  CascaderNode,
  Tag,
} from '@element-plus/components/cascader-panel'
import type { ComponentSize } from '@element-plus/utils/types'

const DEFAULT_INPUT_HEIGHT = 40

const INPUT_HEIGHT_MAP = {
  medium: 36,
  small: 32,
  mini: 28,
}

const popperOptions: Partial<Options> = {
  modifiers: [
    {
      name: 'arrowPosition',
      enabled: true,
      phase: 'main',
      fn: ({ state }) => {
        const { modifiersData, placement } = state
        if (['right', 'left'].includes(placement)) return
        modifiersData.arrow.x = 35
      },
      requires: ['arrow'],
    },
  ],
}

export default defineComponent({
  name: 'ElCascader',

  components: {
    ElCascaderPanel,
    ElInput,
    ElPopper,
    ElScrollbar,
    ElTag,
  },

  directives: {
    Clickoutside,
  },

  props: {
    ...CommonProps,
    size: {
      type: String as PropType<ComponentSize>,
      validator: isValidComponentSize,
    },
    placeholder: {
      type: String,
    },
    disabled: Boolean,
    clearable: Boolean,
    filterable: Boolean,
    filterMethod: {
      type: Function as PropType<
        (node: CascaderNode, keyword: string) => boolean
      >,
      default: (node: CascaderNode, keyword: string) =>
        node.text.includes(keyword),
    },
    separator: {
      type: String,
      default: ' / ',
    },
    showAllLevels: {
      type: Boolean,
      default: true,
    },
    collapseTags: Boolean,
    debounce: {
      type: Number,
      default: 300,
    },
    beforeFilter: {
      type: Function as PropType<(value: string) => boolean | Promise<any>>,
      default: () => true,
    },
    popperClass: {
      type: String,
      default: '',
    },
    popperAppendToBody: {
      type: Boolean,
      default: true,
    },
  },

  emits: [
    UPDATE_MODEL_EVENT,
    CHANGE_EVENT,
    'focus',
    'blur',
    'visible-change',
    'expand-change',
    'remove-tag',
  ],

  setup(props, { emit }) {
    let inputInitialHeight = 0
    let pressDeleteCount = 0

    const { t } = useLocaleInject()
    const $ELEMENT = useGlobalConfig()
    const elForm = inject(elFormKey, {} as ElFormContext)
    const elFormItem = inject(elFormItemKey, {} as ElFormItemContext)

    const popper = ref(null)
    const input = ref(null)
    const tagWrapper = ref(null)
    const panel = ref(null)
    const suggestionPanel = ref(null)
    const popperVisible = ref(false)
    const inputHover = ref(false)
    const filtering = ref(false)
    const inputValue = ref('')
    const searchInputValue = ref('')
    const presentTags: Ref<Tag[]> = ref([])
    const suggestions: Ref<CascaderNode[]> = ref([])

    const isDisabled = computed(() => props.disabled || elForm.disabled)
    const inputPlaceholder = computed(
      () => props.placeholder || t('el.cascader.placeholder')
    )
    const realSize: ComputedRef<ComponentSize> = computed(
      () => props.size || elFormItem.size || $ELEMENT.size
    )
    const tagSize = computed(() =>
      ['small', 'mini'].includes(realSize.value) ? 'mini' : 'small'
    )
    const multiple = computed(() => !!props.props.multiple)
    const readonly = computed(() => !props.filterable || multiple.value)
    const searchKeyword = computed(() =>
      multiple.value ? searchInputValue.value : inputValue.value
    )
    const checkedNodes: ComputedRef<CascaderNode[]> = computed(
      () => panel.value?.checkedNodes || []
    )
    const clearBtnVisible = computed(() => {
      if (
        !props.clearable ||
        isDisabled.value ||
        filtering.value ||
        !inputHover.value
      )
        return false

      return !!checkedNodes.value.length
    })
    const presentText = computed(() => {
      const { showAllLevels, separator } = props
      const nodes = checkedNodes.value
      return nodes.length
        ? multiple.value
          ? ' '
          : nodes[0].calcText(showAllLevels, separator)
        : ''
    })

    const checkedValue = computed<CascaderValue>({
      get() {
        return props.modelValue
      },
      set(val) {
        emit(UPDATE_MODEL_EVENT, val)
        emit(CHANGE_EVENT, val)
        elFormItem.formItemMitt?.emit('el.form.change', [val])
      },
    })

    const popperPaneRef = computed(() => {
      return popper.value?.popperRef
    })

    const togglePopperVisible = (visible?: boolean) => {
      if (isDisabled.value) return

      visible = visible ?? !popperVisible.value

      if (visible !== popperVisible.value) {
        popperVisible.value = visible
        input.value.input.setAttribute('aria-expanded', visible)

        if (visible) {
          updatePopperPosition()
          nextTick(panel.value.scrollToExpandingNode)
        } else if (props.filterable) {
          const { value } = presentText
          inputValue.value = value
          searchInputValue.value = value
        }

        emit('visible-change', visible)
      }
    }

    const updatePopperPosition = () => {
      nextTick(popper.value.update)
    }

    const hideSuggestionPanel = () => {
      filtering.value = false
    }

    const genTag = (node: CascaderNode): Tag => {
      const { showAllLevels, separator } = props
      return {
        node,
        key: node.uid,
        text: node.calcText(showAllLevels, separator),
        hitState: false,
        closable: !isDisabled.value && !node.isDisabled,
      }
    }

    const deleteTag = (tag: Tag) => {
      const { node } = tag
      node.doCheck(false)
      panel.value.calculateCheckedValue()
      emit('remove-tag', node.valueByOption)
    }

    const calculatePresentTags = () => {
      if (!multiple.value) return

      const nodes = checkedNodes.value
      const tags: Tag[] = []

      if (nodes.length) {
        const [first, ...rest] = nodes
        const restCount = rest.length

        tags.push(genTag(first))

        if (restCount) {
          if (props.collapseTags) {
            tags.push({
              key: -1,
              text: `+ ${restCount}`,
              closable: false,
            })
          } else {
            rest.forEach((node) => tags.push(genTag(node)))
          }
        }
      }

      presentTags.value = tags
    }

    const calculateSuggestions = () => {
      const { filterMethod, showAllLevels, separator } = props
      const res = panel.value
        .getFlattedNodes(!props.props.checkStrictly)
        .filter((node) => {
          if (node.isDisabled) return false
          node.calcText(showAllLevels, separator)
          return filterMethod(node, searchKeyword.value)
        })

      if (multiple.value) {
        presentTags.value.forEach((tag) => {
          tag.hitState = false
        })
      }

      filtering.value = true
      suggestions.value = res
      updatePopperPosition()
    }

    const focusFirstNode = () => {
      let firstNode = null

      if (filtering.value && suggestionPanel.value) {
        firstNode = suggestionPanel.value.$el.querySelector(
          '.el-cascader__suggestion-item'
        )
      } else {
        firstNode = panel.value?.$el.querySelector(
          '.el-cascader-node[tabindex="-1"]'
        )
      }

      if (firstNode) {
        firstNode.focus()
        !filtering.value && firstNode.click()
      }
    }

    const updateStyle = () => {
      const inputInner = input.value.input
      const tagWrapperEl = tagWrapper.value
      const suggestionPanelEl = suggestionPanel.value?.$el

      if (isServer || !inputInner) return

      if (suggestionPanelEl) {
        const suggestionList = suggestionPanelEl.querySelector(
          '.el-cascader__suggestion-list'
        )
        suggestionList.style.minWidth = inputInner.offsetWidth + 'px'
      }

      if (tagWrapperEl) {
        const { offsetHeight } = tagWrapperEl
        const height =
          presentTags.value.length > 0
            ? Math.max(offsetHeight + 6, inputInitialHeight) + 'px'
            : `${inputInitialHeight}px`
        inputInner.style.height = height
        updatePopperPosition()
      }
    }

    const getCheckedNodes = (leafOnly: boolean) => {
      return panel.value.getCheckedNodes(leafOnly)
    }

    const handleExpandChange = (value: CascaderValue) => {
      updatePopperPosition()
      emit('expand-change', value)
    }

    const handleKeyDown = (e: KeyboardEvent) => {
      switch (e.code) {
        case EVENT_CODE.enter:
          togglePopperVisible()
          break
        case EVENT_CODE.down:
          togglePopperVisible(true)
          nextTick(focusFirstNode)
          e.preventDefault()
          break
        case EVENT_CODE.esc:
        case EVENT_CODE.tab:
          togglePopperVisible(false)
          break
      }
    }

    const handleClear = () => {
      panel.value.clearCheckedNodes()
      togglePopperVisible(false)
    }

    const handleSuggestionClick = (node: CascaderNode) => {
      const { checked } = node

      if (multiple.value) {
        panel.value.handleCheckChange(node, !checked, false)
      } else {
        !checked && panel.value.handleCheckChange(node, true, false)
        togglePopperVisible(false)
      }
    }

    const handleDelete = () => {
      const tags = presentTags.value
      const lastTag = tags[tags.length - 1]
      pressDeleteCount = searchInputValue.value ? 0 : pressDeleteCount + 1

      if (!lastTag || !pressDeleteCount) return

      if (lastTag.hitState) {
        deleteTag(lastTag)
      } else {
        lastTag.hitState = true
      }
    }

    const handleFilter = debounce(() => {
      const { value } = searchKeyword

      if (!value) return

      const passed = props.beforeFilter(value)

      if (isPromise(passed)) {
        passed.then(calculateSuggestions).catch(() => {
          /* prevent log error */
        })
      } else if (passed !== false) {
        calculateSuggestions()
      } else {
        hideSuggestionPanel()
      }
    }, props.debounce)

    const handleInput = (val: string, e: KeyboardEvent) => {
      !popperVisible.value && togglePopperVisible(true)

      if (e?.isComposing) return

      val ? handleFilter() : hideSuggestionPanel()
    }

    watch(filtering, updatePopperPosition)

    watch([checkedNodes, isDisabled], calculatePresentTags)

    watch(presentTags, () => nextTick(updateStyle))

    watch(presentText, (val) => (inputValue.value = val), { immediate: true })

    onMounted(() => {
      const inputEl = input.value.$el
      inputInitialHeight =
        inputEl?.offsetHeight ||
        INPUT_HEIGHT_MAP[realSize.value] ||
        DEFAULT_INPUT_HEIGHT
      addResizeListener(inputEl, updateStyle)
    })

    onBeforeUnmount(() => {
      removeResizeListener(input.value.$el, updateStyle)
    })

    return {
      Effect,
      popperOptions,
      popper,
      popperPaneRef,
      input,
      tagWrapper,
      panel,
      suggestionPanel,
      popperVisible,
      inputHover,
      inputPlaceholder,
      filtering,
      presentText,
      checkedValue,
      inputValue,
      searchInputValue,
      presentTags,
      suggestions,
      isDisabled,
      realSize,
      tagSize,
      multiple,
      readonly,
      clearBtnVisible,
      t,
      togglePopperVisible,
      hideSuggestionPanel,
      deleteTag,
      focusFirstNode,
      getCheckedNodes,
      handleExpandChange,
      handleKeyDown,
      handleClear,
      handleSuggestionClick,
      handleDelete,
      handleInput,
    }
  },
})
</script>

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style

css.ts

代码

import "@element-plus/components/base/style/css"
import "@element-plus/theme-chalk/el-cascader.css"
import "@element-plus/components/input/style/css"
import "@element-plus/components/popper/style/css"
import "@element-plus/components/tag/style/css"
import "@element-plus/components/cascader-panel/style/css"

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index.ts

代码

import "@element-plus/components/base/style"
import "@element-plus/theme-chalk/src/cascader.scss"
import "@element-plus/components/input/style/index"
import "@element-plus/components/popper/style/index"
import "@element-plus/components/tag/style/index"
import "@element-plus/components/cascader-panel/style/index"

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index.ts

组件入口

import { App } from 'vue'
import type { SFCWithInstall } from '@element-plus/utils/types'
import Cascader from './src/index.vue'

Cascader.install = (app: App): void => {
  app.component(Cascader.name, Cascader)
}

const _Cascader = Cascader as SFCWithInstall<typeof Cascader>

export default _Cascader
export const ElCascader = _Cascader

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