How to use recursive components in Vue?

Vue is one of the most popular front-end frameworks. It is easy to use and very flexible. In Vue, recursive components are a very useful technology that can help us use components within components and avoid the trouble of passing data between components.

Now, let’s take a closer look at how to use recursive components in Vue.

1. What are recursive components?

First of all, we need to understand what recursive components are. Recursive components are a technique that allows you to reuse yourself repeatedly within a component. For example, there may be such a requirement in a component: we need to present a set of tree-structured data, and each node and its child nodes are the same component. At this time, we can use recursive components to achieve this.

2. How to use recursive components

In Vue, there are two ways to use recursive components. Below we introduce them one by one.

2.1. Use your own component directly

We can use ourselves directly in the template of the component, and pass in the current data through props to let the component itself perform recursion.

The following is an example of using recursive components to present a tree structure:

<template>
  <div>
    <div v-for="item in list" :key="item.id">
      <TreeNode :node="item" :children="item.children" />
    </div>
  </div>
</template>

<script>
export default {
  name: 'Tree',
  props: {
    list: Array,
  },
  components: {
    TreeNode: {
      name: 'TreeNode',
      props: {
        node: Object,
        children: Array,
      },
      template: `
        <div>
          <div>{{node.title}}</div>
          <Tree v-if="children" :list="children" />
        </div>
      `,
    },
  },
};
</script>

In the above example, we created a Tree component to present tree structure data, and the TreeNode component is a recursive component , which will call itself when needed.

2.2. Use the name attribute

In addition to using its own component directly, we can also use the name attribute to avoid infinite loop calls of components. By doing this, we can make Vue cache an instance for each component, avoiding unnecessary rendering costs.

We can write a custom tag in the component's template, and then specify the name of the tag in the component's name attribute. This requires us to divide the component into two parts: one is the root component marked by the name attribute, and the other is the child component presented recursively. In the child component, when we need to use itself recursively, we can directly use the name of the root component.

The following is an example of using recursive components to present a tree structure. Similar to the above example, we use the name attribute to avoid infinite loop calls.

<template>
  <div>
    <div v-for="item in list" :key="item.id">
      <tree-node :node="item" />
    </div>
  </div>
</template>

<script>
export default {
  name: 'Tree',
  props: {
    list: Array,
  },
  components: {
    TreeNode: {
      name: 'tree-node',
      props: {
        node: Object,
      },
      template: `
        <div>
          <div>{{node.title}}</div>
          <tree v-if="node.children" :list="node.children" />
        </div>
      `,
    },
  },
};
</script>

In the above example, we created a Tree component to present tree-structured data, and the TreeNode component uses the name attribute to avoid infinite loop calls of the component.

3. Summary

Above, we introduced how to use recursive components in Vue. Recursive components are a very flexible technology that allows us to pass data more freely between components. It should be noted that when using recursive components, you must avoid infinite loop calls and try to use the name attribute to avoid this situation.

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