docs.vikingship.xyz/typescript.…

4-5columnList组件的编写

<template>
  <div class="row">
    <div v-for="column in columnList" :key="column._id" class="col-4 mb-4">
      <div class="card h-100 shadow-sm">
        <div class="card-body text-center">
          <img :src="column.avatar && column.avatar.fitUrl" :alt="column.title" class="rounded-circle border border-light my-3" >
          <h5 class="card-title">{{column.title}}</h5>
          <p class="card-text text-left">{{column.description}}</p>
          <router-link :to="`/column/${column._id}`" class="btn btn-outline-primary">进入专栏</router-link>
        </div>
      </div>
    </div>
  </div>
</template>


<script lang="ts">


import { defineComponent, PropType, computed } from 'vue'
import { ColumnProps } from '../store'
import { addColumnAvatar } from '../helper'


export default defineComponent({
  name: 'ColumnList',
  props: {
    list: {
      type: Array as PropType<ColumnProps[]>,
      required: true
    }
  },
  setup(props) {
    const columnList = computed(() => {
      return props.list.map(column => {
        addColumnAvatar(column, 50, 50)
        return column
      })
    })
    return {
      columnList
    }
  }
})
</script>
<style scoped>
.card-body img {
  width: 50px;
  height: 50px;
}
</style>

4-7globalHeader组件编写

<template>
  <nav class="navbar navbar-dark bg-primary justify-content-between mb-4 px-4">
    <router-link class="navbar-brand" to="/">者也专栏</router-link>
    <ul v-if="!user.isLogin" class="list-inline mb-0">
      <li class="list-inline-item"><router-link to="/login" class="btn btn-outline-light my-2">登陆</router-link></li>
      <li class="list-inline-item"><router-link to="/signup" class="btn btn-outline-light my-2">注册</router-link></li>
    </ul>
    <ul v-else class="list-inline mb-0">
      <li class="list-inline-item">
        <dropdown :title="`你好 ${user.nickName}`">
          <dropdown-item><router-link to="/create" class="dropdown-item">新建文章</router-link></dropdown-item>
          <dropdown-item><router-link :to="`/column/${user.column}`" class="dropdown-item">我的专栏</router-link></dropdown-item>
          <dropdown-item disabled><a href="#" class="dropdown-item">编辑资料</a></dropdown-item>
          <dropdown-item><a href="#" class="dropdown-item">退出登陆</a></dropdown-item>
        </dropdown>
      </li>
    </ul>
  </nav>
</template>


<script lang="ts">
import { defineComponent, PropType } from 'vue'
import Dropdown from './Dropdown.vue'
import DropdownItem from './DropdownItem.vue'
import { UserProps } from '../store'


export default defineComponent({
  name: 'GlobalHeader',
  components: {
    Dropdown,
    DropdownItem
  },
  props: {
    user: {
      type: Object as PropType<UserProps>,
      required: true
    }
  }
})
</script>

4-8-DropDown组件基本功能编码

<template>
<div class="dropdown" ref="dropdownRef">
  <a href="#" class="btn btn-outline-light my-2 dropdown-toggle" @click.prevent="toggleOpen">
    {{title}}
  </a>
  <ul class="dropdown-menu" :style="{display: 'block'}" v-if="isOpen">
    <slot></slot>
  </ul>
</div>
</template>


<script lang="ts">
import { defineComponent, ref, watch } from 'vue'
import useClickOutside from '../hooks/useClickOutside'
export default defineComponent({
  name: 'Dropdown',
  props: {
    title: {
      type: String,
      required: true
    }
  },
  setup() {
    const isOpen = ref(false)
    const dropdownRef = ref<null | HTMLElement>(null)
    const toggleOpen = () => {
      isOpen.value = !isOpen.value
    }
    const isClickOutside = useClickOutside(dropdownRef)


    watch(isClickOutside, () => {
      if (isOpen.value && isClickOutside.value) {
        isOpen.value = false
      }
    })
    return {
      isOpen,
      toggleOpen,
      dropdownRef
    }
  }
})
</script>

4-9-DropDownItem

<template>
  <li
    class="dropdown-option"
    :class="{'is-disabled': disabled}"
  >
    <slot></slot>
  </li>
</template>


<script lang="ts">
import { defineComponent } from 'vue'
export default defineComponent({
  props: {
    disabled: {
      type: Boolean,
      default: false
    }
  }
})
</script>


<style>
.dropdown-option.is-disabled * {
  color: #6c757d;
  pointer-events: none;
  background-color: transparent;
}
</style>

4-10dropdown组件点击外部区域自动隐藏

在mounted的时候添加click事件，在unmounted的事件将事件移除

拿到dropdown的dom元素从而判断点击的内容是否被包含

4-11-useClickOutSide第一个自定义函数

import { ref, onMounted, onUnmounted, Ref } from 'vue'

const useClickOutside = (elementRef: Ref<null | HTMLElement>) => {
  const isClickOutside = ref(false)
  const handler = (e: MouseEvent) => {
    if (elementRef.value) {
      if (elementRef.value.contains(e.target as HTMLElement)) {
        isClickOutside.value = false
      } else {
        isClickOutside.value = true
      }
    }
  }
  onMounted(() => {
    document.addEventListener('click', handler)
  })
  onUnmounted(() => {
    document.removeEventListener('click', handler)
  })
  return isClickOutside
}

export default useClickOutside