vue.js - How to re-mount a component in VueJS?

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vue.js - How to re-mount a component in VueJS?

posted Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

vue.js - How to re-mount a component in VueJS?

I have a component which is mounted as part of the DOM rendering. The skeleton of the application is

<!DOCTYPE html>
<html>
  <head>
    <meta charset="UTF-8">
    <title>title</title>
  </head>
  <body>
    <div id="app">
      <my-component></my-component>
      <button>press this button to reload the component</button>
    </div>
  </body>
</html>

<my-component> is functional (it displays a few form inputs) and $emit data to the parent.

Is there a way to re-mount it? The goal is to have a component content and setup as if it was just rendered for the first time (including a reset of the data() elements which hold its state).

There are some solutions to that but they all assume a rewrite of data(), which I would like to avoid.

My understanding is that a component is actuall HTML/CSS/JS code injected in the dom in the right place during the rendering so I fear that the concept of "re-mounting" it does not exist - I just wanted to make sure before going the data()-rewrite way.

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1 Reply

深蓝 · Answer 1 · 2021-10-17T01:03:58+0000

The trick is to alter the key

When the key changes, vue regards it as a new component, so it will unmount the "old" component, and mount a "new" component.

See example, the created() hook will only run once, so if you see the value change, you're seeing a brand new object.

example:

Vue.component('my-component', {
  template: `<div>{{ rand }}</div>`,
  data() {
    return {
      rand: ''
    }
  },
  created() {
    this.rand = Math.round(Math.random() * 1000)
  }
});

new Vue({
  el: '#app',
  data: {
    componentKey:0
  }
})

<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.5.8/vue.min.js"></script>

<div id="app">
  <my-component :key="componentKey"></my-component>
  <button @click="componentKey=!componentKey">press this button to reload the component</button>
</div>

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vue.js - How to re-mount a component in VueJS?

vue.js - How to re-mount a component in VueJS?

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The trick is to alter the key

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