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Teleport

遇到的问题：

  • Dialog 被包裹在其他组件之中，容易被干扰
  • 样式也在其他组件中，容易变得非常混乱

新建src/components/Modal.vue:

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<template>
  <div id="center">
    <h2>this is a model</h2>
  </div>
</template>

<script lang="ts">
import { defineComponent } from 'vue';
export default defineComponent({
});
</script>

<style scoped>
  #center {
    width: 200px;
    height: 200px;
    border: 2px solid black;
    background: white;
    position: fixed;
    left: 50%;
    top: 50%;
    margin-left: -100px;
    margin-top: -100px;
  }
</style>

src/App.vue:

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<template>
  <div id="app">
    <img alt="Vue logo" src="./assets/logo.png">
    <h1>{{ count }}</h1>
    <h1>{{ double }}</h1>
    <h1>{{ greetings }}</h1>
    <h1 v-if="loading">Loading!...</h1>
    <img v-if="loaded" :src="result[0].url">
    <h1>X: {{ x }}, Y: {{ y }}</h1>
    <modal/>
    <button @click="increase">👍+1</button><br>
    <button @click="updateGreeting">Update Title</button>
  </div>
</template>

<script lang="ts">
import { ref, computed, reactive, toRefs, watch } from 'vue';
import useMousePosition from './hooks/useMousePosition'
import useURLLoader from './hooks/useURLLoader'
import Modal from './components/Modal.vue'


interface DataProps {
  count: number;
  double: number;
  increase: () => void;
}
interface DogResult {
  message: string;
  status: string;
}
interface CatResult {
  id: string;
  url: string;
  width: number;
  height: number;
}

export default ({
  name: 'App',
  components: {
    Modal
  },
  setup() {
    const data: DataProps = reactive({
      count: 0,
      increase: () => { data.count++ },
      double: computed(() => data.count * 2),
    })
    const { x, y } = useMousePosition()
    const { result, loading, loaded } = useURLLoader<CatResult[]>('https://api.thecatapi.com/v1/images/search?limit=1')
    watch(result, () => {
      if (result.value) {
        console.log(result.value[0].url)
      }
    })
    const greetings = ref('')
    const updateGreeting = () => {
      console.log('hhhh')
      greetings.value += 'Hello! '
    }
    watch([greetings, () => data.count], (newValue, oldValue) => {
      console.log('old', oldValue)
      console.log('new', newValue)
      document.title = 'updated' + greetings.value + data.count
    })
    const refData = toRefs(data)
    return {
      ...refData,
      greetings,
      updateGreeting,
      x,
      y,
      result,
      loading,
      loaded
    }
  }
});
</script>

<style>
#app {
  font-family: Avenir, Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-align: center;
  color: #2c3e50;
  margin-top: 60px;
}
</style>

此时的 dialog 嵌套在其他结构当中

使用 teleport 改造

teleport 为默认组件，可以直接使用

修改public/index.html:

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<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width,initial-scale=1.0">
    <link rel="icon" href="<%= BASE_URL %>favicon.ico">
    <title><%= htmlWebpackPlugin.options.title %></title>
  </head>
  <body>
    <noscript>
      <strong>We're sorry but <%= htmlWebpackPlugin.options.title %> doesn't work properly without JavaScript enabled. Please enable it to continue.</strong>
    </noscript>
    <div id="app"></div>
    <div id="modal"></div>
    <!-- built files will be auto injected -->
  </body>
</html>

修改src/components/Modal.vue:

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<template>
<teleport to="#modal">
  <div id="center">
    <h2>this is a model</h2>
  </div>
</teleport>
</template>

此时 dialog 在 modal 节点中，不在 app 中(从 app 节点传送到了 modal 节点)

src/components/Modal.vue:

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<template>
<teleport to="#modal">
  <div id="center" v-if="isOpen">
    <h2><slot>this is a model</slot></h2>
    <button @click="buttonClick">Close</button>
  </div>
</teleport>
</template>

<script lang="ts">
import { defineComponent } from 'vue';
export default defineComponent({
  props: {
    isOpen: Boolean
  },
  emits: {
    'close-modal': null
  },
  setup(props, context) {
    const buttonClick = () => {
      context.emit('close-modal')
    }
    return {
      buttonClick
    }
  }
});
</script>


<style scoped>
  #center {
    width: 200px;
    height: 200px;
    border: 2px solid black;
    background: white;
    position: fixed;
    left: 50%;
    top: 50%;
    margin-left: -100px;
    margin-top: -100px;
  }
</style>

src/App.vue:

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<template>
  <div id="app">
    <img alt="Vue logo" src="./assets/logo.png">
    <h1>{{ count }}</h1>
    <h1>{{ double }}</h1>
    <h1>{{ greetings }}</h1>
    <button @click="openModal">Open Modal</button><br>
    <h1 v-if="loading">Loading!...</h1>
    <img v-if="loaded" :src="result[0].url">
    <h1>X: {{ x }}, Y: {{ y }}</h1>
    <modal :isOpen="modalIsOpen" @close-modal="onModalClose"> My Modal !!!!</modal>
    <button @click="increase">👍+1</button><br>
    <button @click="updateGreeting">Update Title</button>
  </div>
</template>

<script lang="ts">
import { ref, computed, reactive, toRefs, watch } from 'vue';
import useMousePosition from './hooks/useMousePosition'
import useURLLoader from './hooks/useURLLoader'
import Modal from './components/Modal.vue'


interface DataProps {
  count: number;
  double: number;
  increase: () => void;
}
interface DogResult {
  message: string;
  status: string;
}
interface CatResult {
  id: string;
  url: string;
  width: number;
  height: number;
}

export default ({
  name: 'App',
  components: {
    Modal
  },
  setup() {
    const data: DataProps = reactive({
      count: 0,
      increase: () => { data.count++ },
      double: computed(() => data.count * 2),
    })
    const { x, y } = useMousePosition()
    const { result, loading, loaded } = useURLLoader<CatResult[]>('https://api.thecatapi.com/v1/images/search?limit=1')
    watch(result, () => {
      if (result.value) {
        console.log(result.value[0].url)
      }
    })
    const greetings = ref('')
    const updateGreeting = () => {
      console.log('hhhh')
      greetings.value += 'Hello! '
    }
    watch([greetings, () => data.count], (newValue, oldValue) => {
      console.log('old', oldValue)
      console.log('new', newValue)
      document.title = 'updated' + greetings.value + data.count
    })
    const refData = toRefs(data)
    const modalIsOpen = ref(false)
    const openModal = () => {
      modalIsOpen.value = true
    }
    const onModalClose = () => {
      modalIsOpen.value = false
    }
    return {
      ...refData,
      greetings,
      updateGreeting,
      x,
      y,
      result,
      loading,
      loaded,
      modalIsOpen,
      onModalClose,
      openModal
    }
  }
});
</script>

<style>
#app {
  font-family: Avenir, Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-align: center;
  color: #2c3e50;
  margin-top: 60px;
}
</style>