vue cannot load the custom component dom

Recently, in the process of using Vue to develop projects, I encountered a difficult problem, that is, the DOM of custom components cannot be loaded. In this post, I want to share how I solved this problem.

1. Check the name and path of the component

First, we need to check whether the name and path of the custom component are correct. In Vue, we can register components in three ways: global registration, local registration and asynchronous registration. After determining the registration method, we need to check whether the name and path of the component are correct. Vue will fail to load the custom component's DOM if the name and path do not match.

2. Check if the component is exported correctly

Next, we need to make sure the component is exported correctly. In Vue, we can export components through export default or module.exports. If the component is not exported correctly, Vue will not load the custom component's DOM correctly.

3. Check the selector of the component

In Vue, we can use the template tag or the render function to define the component DOM. No matter which way we use, we need to define the name of the component in the component's picker, for example:

<template>
  <div class="my-custom-component">
    ...
  </div>
</template>

export default {
  name: 'my-custom-component',
  render() {
    return (
      <div class="my-custom-component">
        ...
      </div>
    )
  }
}

If the correct name is not defined in the component's picker, Vue will not be able to load the component's DOM.

4. Check the parent element of the component

If we place a custom component in a Vue instance, we need to ensure that the parent element of the component is correctly defined. For example:

<!-- 错误的写法 -->
<div>
  <my-custom-component />
</div>

<!-- 正确的写法 -->
<div id="app">
  <my-custom-component />
</div>

If we do not define the component correctly in the parent element of the Vue instance, Vue will not be able to load the component's DOM.

5. Check if the component is referenced correctly

Finally, we need to ensure that the custom component is referenced correctly in the component that needs to be used. In Vue, we can reference a component using its name or the name of a variable defined by the component. If a component is not referenced correctly, Vue will fail to load the component's DOM.

Summary

When developing a Vue project, it is not a rare situation to encounter the problem that custom components cannot be loaded. Usually, we can solve this problem by checking the component's name, path, selector, parent element and reference method. If the above steps cannot solve the problem, we can consider using console.log to debug in Vue's life cycle hook function to better understand the custom component rendering process and possible problems.

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