一.Cascader

Cascader 级联选择器

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

vue

<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>

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663

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"

index.ts

代码

import "@element-plus/components/base/style"
import "@element-plus/theme-chalk/src/cascader.less"
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"

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

一.Cascader ​

输出 ​

一.Cascader

输出