Inline class CSS in Vue is a game-changer for developers.
It allows you to write more concise and readable code by eliminating the need for class names.
By using the `v-bind:class` directive, you can dynamically apply styles to your components.
This is especially useful when working with conditional statements or loops.
For example, you can use the `is-active` class to highlight the active menu item.
This can be achieved by binding the `class` attribute to a boolean variable in your Vue instance.
Advanced Optimizations
You can speed up the download of your global CSS files by using a CDN, compressing your assets with Brotli, and hosting them on the same domain.
Use a CDN so the files are physically closer to your users, compress your assets ideally using Brotli, and use HTTP2/HTTP3 for delivery.
Most of these things should be done for you automatically if you're using modern platforms like Cloudflare, Netlify, or Vercel.
You can find an LCP optimization guide on web.dev.
If all of your CSS is inlined by Nuxt, you can experimentally completely stop external CSS files from being referenced in your rendered HTML.
You can achieve that with a hook, that you can place in a module, or in your Nuxt configuration file.
Nuxt file-system routing creates a route for every file in the pages/ directory.
Expand your knowledge: Css in Html File
Dynamic CSS
Dynamic CSS is a powerful feature in Vue that allows you to modify CSS styles and classes dynamically.
You can use Vue to modify CSS by using v-bind on the style and class attributes.
In-line styling with v-bind:style is a technique we've already seen in this tutorial, and it's a great way to change CSS dynamically.
Assigning a class with v-bind:class is another technique that's been explained in this tutorial, and it's useful for adding or removing classes dynamically.
We've also seen examples of Vue changing CSS in this tutorial, where v-bind is used to bind data to the style and class attributes.
If this caught your attention, see: Css Selector That Targets a Specific Property Declaration
Assign a Class
You can assign a class to an HTML element in Vue using the v-bind:class directive. This allows you to dynamically apply classes based on your application's state.
To assign a single class, simply use the v-bind:class directive with a string value, like this: v-bind:class="className".
Multiple classes can be assigned by separating them with commas: v-bind:class="className1, className2".
Vue will merge classes assigned with both the class attribute and the v-bind:class directive.
Here's an example of how to use array syntax to assign multiple classes:
With array syntax, you can use both classes that depend on a Vue property and classes that don't depend on a Vue property.
Related reading: Add Css Property to a Predefined Class Javascript
Alternative Style Options
You can directly write CSS or preprocessor code in the style block of your components file, making for a great developer experience without needing to use CSS-in-JS.
If you do want to use CSS-in-JS, there are third-party libraries and modules available, such as pinceau.
Vue merges CSS classes assigned to an HTML tag with both class="" and v-bind:class="", so you can use both methods together.
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Here are some ways to use v-bind:class and v-bind:style:
Frequently Asked Questions
How to write inline CSS in Vue?
To write inline CSS in Vue, use the v-bind:style directive. This allows you to dynamically apply styles to HTML elements directly in your Vue template.
How to apply CSS class conditionally in Vue?
To apply a CSS class conditionally in Vue, bind a JavaScript object to the class, where properties correspond to classes and values are JavaScript expressions that determine application. This approach allows for dynamic and flexible styling.
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