What is the reason for the prohibition of style tags in a Vue template, while they are permitted in a .vue file?

While browsing through the Vue documentation, I noticed that Vue appears to automatically remove <style> tags from your template. For instance, if you have a component in a .js file like...

export default {
   template: (
      `<section>
         <style scoped>
            header { color: blue; }
         </style>
         <header>Hello!</header>
         ...
      </section>`
   ),
   // data, methods, etc.
};

...then the style declaration for the header will not be applied; it will simply vanish with a message stating

"Tags with side effect (<script> and <style>) are ignored in client component templates."

However, when using a .vue file along with the vue cli, it is recommended to separate your CSS within a <style scoped> tag, JavaScript within a <script> tag, and HTML template within a <template> tag.

If there is no other documented way to include styling via a component's configuration parameters, then we seem to have two distinct paradigms - one for components in JS files, and another for Vue components. Is there any alternative method for those who do not use the vue-cli to implement component-scoped styles in their Vue application?

Answer №1

If you're feeling like it's too late to find a solution, don't worry! While I may not have the answer for you right now, there's hope for others who might face similar challenges in the future.

One workaround for the issue involves utilizing Vue's <component> tag, as shown below:

<component is="style" scoped>
    .pager.inactive {
        display: none;
    }
</component>

This approach should work well for the <style> tag, although other elements could present difficulties. Furthermore, loading an external CSS file may not be advisable. It's generally best to avoid this practice and instead consider breaking down your component into smaller ones if it grows too large.

Answer №2

The explanation lies in the divergence between pre-compiled and run-time-compiled paths for rendering content.

When utilizing the CLI to compile SFCs (Single File Components, such as `.vue` files), the compiler will generate necessary css file(s) and convert template content into JavaScript code. This results in the elimination of HTML template code during compilation, with rendering carried out via the generated js bundle.

In contrast, if relying on vue for run-time compilation of templates, css compilation is not supported due to various reasons like additional dependencies requirements and inability to generate a css file, leading to ambiguity in css injection.

To enable css injection into the page, manual injection can be performed without constraints. This involves defining a <template> (or similar tag) to contain the style, followed by component insertion of a scoping id before each selector and script injection into the html. While this method may require fine-tuning for comprehensive management of all selectors, it remains feasible.

Answer №3

In Short:

"Templates in Vue are optimized during compile-time."

Source

Delving Deeper:

"Although Vue's declarative rendering handles most DOM operations, there are situations where direct access to DOM elements is necessary. This can be achieved using the special ref attribute:"

<input ref="input">

"The ref attribute is similar to the key attribute in v-for loop, providing a way to get a reference to a specific element or component instance after it's been mounted. This comes in handy for tasks like focusing an input element programmatically on mount or initializing external libraries on elements."

I also came across this discussion on the Vue forums

Aug '19 Both vue-loader and Vue template compiler will omit any style tags encountered.

A workaround is to utilize Vue’s built-in component feature

API v2 Reference

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