The core of using dynamic components in Vue is to achieve flexible component switching. 1. Use the tag to bind component names, objects or variables with: is attributes to realize Tab switching and other scenarios; 2. Components need to be registered first, supporting asynchronous loading; 3. Use <keep-alive> to cache states to avoid duplicate loading; 4. Pass parameters to dynamic components through v-bind or v-model; 5. It is recommended to store component names in variables to improve flexibility and maintainability. The rational use of dynamic components can simplify interface switching logic, but attention should be paid to avoid excessive caching and component splitting.

Use dynamic components in Vue, mainly to achieve flexible switching between components. The most common scenarios are Tab tab switching, conditional rendering of different interface elements, etc. Vue provides built-in <component></component> tags and :is attributes to support dynamic component rendering.

How to use <component :is="xxx"></component>

Vue's dynamic component mechanism is very simple, the core is to use the <component></component> tag and bind the :is attribute. :is can be a component name, imported component object, or it can be the result of a variable or computed attribute.

For example:

 <template>
  <component :is="currentComponent" />
</template>

<script>
export default {
  data() {
    return {
      currentComponent: &#39;Home&#39;
    }
  },
  components: {
    Home: () => import(&#39;./components/Home.vue&#39;),
    About: () => import(&#39;./components/About.vue&#39;)
  }
}
</script>

In this example, just by modifying the currentComponent value, you can dynamically switch to display different component contents. This is very useful for building multiple tab pages or displaying different content based on user permissions.

What should be noted is:

• Components must be registered first, whether they are local or global.
• If you use an asynchronous component (such as the arrow function above), Vue will automatically handle the loading process.

Dynamic components and keep-alive cache status

If you want to switch components not to reload but retain the previous state, you can use it in conjunction with Vue's <keep-alive> .

For example:

 <keep-alive>
  <component :is="currentComponent" v-if="shouldRenderComponent" />
</keep-alive>

The advantage of this is that when the component is switched out, its state will not be lost. When it switches back again, it can be restored to its original state, such as form input, scrolling position, etc.

But be aware:

• Not all components need to be cached, and some components should be refreshed every time they switch, such as the data board page.
• Excessive use of keep-alive can lead to increased memory footprint, especially components that contain large amounts of data or resources.

Dynamic components and parameter delivery

Dynamic components are not isolated, and many times we need to pass parameters to it. It can be done by v-bind or v-model :

 <component :is="currentComponent" :user="currentUser" @update="handleUpdate" />

If multiple components accept the same props, this way allows the code to be kept neat and does not require writing a separate template structure for each component.

Some FAQs:

• Make sure that the incoming props are defined in the target component.
• When props types are inconsistent between different components, it is best to make an adaptation layer to avoid directly exposing the differences.

Tips: Use variables to control component names more flexible

Sometimes we want to decide which component to display based on the user's actions or some business logic. At this time, you can store the component name in a variable instead of writing it in a template.

for example:

 data() {
  return {
    currentComponent: this.getComponentName()
  }
},
methods: {
  getComponentName() {
    if (this.user.isAdmin) return 'AdminPanel'
    return 'UserDashboard'
  }
}

This approach makes component choices more dynamic and easier to scale. For example, if you add a new role type in the future, you only need to modify the judgment logic without touching the template structure.

Basically that's it. Dynamic components are a very practical function in Vue. Mastering them well can simplify a lot of UI switching logic. However, you should also pay attention to reasonable use, do not abuse cache or excessively split components, otherwise it will increase maintenance costs.

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