How to solve the problem that uniapp custom components are not displayed after being packaged

With the rapid development of front-end development technology, more and more developers choose to use the uniapp framework for multi-end development. However, when using uniapp custom components, sometimes we encounter the problem that the components are not displayed after packaging. Next, let’s take a closer look at the solution to the problem that uniapp’s custom components are not displayed after being packaged.

Before starting to solve the problem, you need to understand the packaging process of uniapp custom components. When using uniapp to write a custom component, we need to write the logic of the component in the vue file of the component, use the export default statement to export and register the current component when exporting the component, and finally introduce the component into the vue file that needs to use the component. That’s it. This process may involve component style sheets, templates, etc.

When we use npm run build or package the uniapp project in HBuilderX, we actually package all the source code of the current project into a static resource file and generate the corresponding manifest.json file. Finally, the packaged The resource files and the manifest.json file are placed in the dist directory. These packaged files are the files we ultimately need to deploy to the server.

When we introduce a uniapp custom component into a web page, a Vue component is actually dynamically generated through JS, and the generated component is inserted into the DOM of the current vue file as a subcomponent. When packaging uniapp, the packaging tool will extract all static resources introduced by the current project (including component style sheets, templates, JS logic, etc.) and package them into an independent .css and .js files, and then introduce these files through link or script tags in the index.html file. These generated .css and .js files are the files we need to introduce when using custom components.

However, in some cases, we found that the packaged components were not displayed successfully. This is generally caused by the following reasons:

1. The style sheet of the component is not packaged correctly

In custom components, we sometimes use the import statement to introduce some The style sheet of the third-party component library and applies it to the current component. However, after packaging, these imported style sheets may not be correctly packaged into the final uniapp component style sheet due to path problems. At this time, we need to check whether the component's style sheet file exists in the packaged component .css file.

2. The component name is not named according to the specification

In uniapp, each component must have a unique name. The name is separated by lowercase letters and underscores, such as 'custom-component', and the name must be globally unique. If the component name is not named according to the specification, the component may not be displayed after packaging. At this time, we need to check whether the component name conforms to the naming convention and whether it conflicts with other component names.

3. The template or script tag of the component is not parsed correctly

When we use special syntax or coding style during the development process, it may cause the packaged component to fail. The template or script tag was not parsed correctly. For example, if you use syntax such as v-for loop in vue, you also need to use special syntax format in uniapp. If it is not written in accordance with the specifications, the component may not be displayed correctly after packaging. At this time, we need to check whether the component's template and script tags comply with uniapp's syntax specifications.

4. The component is not exported correctly

Finally, the export of the component is also a problem that may cause the component to not be displayed. If the component we export is not correctly registered in the global component of uniapp according to the specification, it may cause the component to not be displayed correctly. At this time, we need to check whether the component is exported correctly and whether the component is registered globally.

To sum up, the above four situations are all possible reasons why uniapp custom components cannot be displayed normally after being packaged. When we use custom components, we need to pay attention to the above issues and write and package them according to uniapp's specifications. Only in this way can the custom component be guaranteed to be used normally in uniapp.

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