Teleport function in Vue3: convenient component rendering position control

Vue3 is one of the more popular front-end frameworks currently. In its 2.x version, it allows us to render component content outside the component through the portal and teleport functions. In Vue3, the portal function is replaced by the teleport function and optimized to make it easier to use and able to accurately control the position of components. This article will introduce the usage of the teleport function to help you better master this function.

1. Introduction to telelport function

The teleport function is a new component rendering method in Vue3, which can transfer the content of the component to other locations on the page. The teleport function can be regarded as the controller of the component rendering position in Vue3. Through it, we can easily control the component to be rendered to any position on the page.

2. Using the teleport function

Below, we will introduce the use of the teleport function through an example. Suppose we have a need to pop up a dialog box somewhere on the page and render a component in the dialog box. We can use the teleport function anywhere on the page to achieve this requirement.

Let’s first take a look at the definition of the teleport function:

<teleport to="CSS 选择器">
  <!-- 将组件的内容转移至此处 -->
  <template v-slot:teleport>
    <!-- 组件的内容 -->
  </template>
</teleport>

As can be seen from the above code, the teleport function needs to specify the target position of the component rendering through the to attribute. Inside the component, we need to use the template tag and use the v-slot:teleport command to specify the component content.

Now, let us take a look at its specific implementation. First, we need to introduce the teleport function inside the component:

<template>
  <teleport to="#dialog">
    <template v-slot:teleport>
      <!-- dialog组件的内容 -->
    </template>
  </teleport>
</template>

In the above code, the to attribute value is "#dialog", which means that we render the component content to the element with the id "dialog" on the page . We can add an element with the id "dialog" anywhere on the page, and use the teleport function in the component to render the component inside the element.

3. Additional parameters of teleport function

In addition to the to attribute, the teleport function can also pass other parameters. Below, we will introduce two of the commonly used parameters.

1. disabled

By adding the disabled attribute to the teleport function, we can disable the effects of the teleport function. For example, in some cases, we want to force the dialog box to be disabled when it is not displayed:

<template>
  <teleport to="#dialog" :disabled="!show">
    <template v-slot:teleport>
      <!-- dialog组件的内容 -->
    </template>
  </teleport>
</template>

In the above code, we add a disabled attribute to the teleport function and bind it to On the show attribute, the teleport function is disabled when show is false.

2. multiple

teleport function can also achieve the target position of rendering multiple different components as needed. We only need to add a * sign after the to attribute, and then specify a different name for each teleport function.

<template>
  <teleport to="#dialog1">
    <template v-slot:teleport>
      <!-- dialog1组件的内容 -->
    </template>
  </teleport>
  <teleport to="#dialog2">
    <template v-slot:teleport>
      <!-- dialog2组件的内容 -->
    </template>
  </teleport>
</template>

In the above code, we specify the to attributes of the two teleport functions as elements with IDs "dialog1" and "dialog2" respectively, thereby rendering different components in different locations.

4. Summary

The teleport function in Vue3 provides a convenient way to help us realize the need to render components anywhere on the page, and can pass different parameters , flexibly control the position and quantity of component rendering under different circumstances. Mastering the use of the teleport function can greatly improve the efficiency of developing complex applications in Vue3.

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