What is the proper way to implement /deep/, >>>, or ::v-deep in Vue.js?

After doing some research, I came across this article explaining how in Vue.js, you can use either /deep/ or >>> in a selector to apply style rules to elements inside child components. However, when trying to implement this in my styles using SCSS or plain CSS, it doesn't seem to work as expected. Instead of applying the styles as intended, they are being sent directly to the browser without any effect. For example:

home.vue:

<style lang="css" scoped>
.autocomplete >>> .autocomplete-input 
{
// ...
}
</style>

generated css:

<style type="text/css">
.autocomplete >>> .autocomplete-input[data-v-2bda0c9a]
{
//...
}
</style>

desired result:

<style type="text/css">
.autocomplete[data-v-2bda0c9a] .autocomplete-input
{
//...
}
</style>

I've also shared my webpack configuration related to vue-loader:

// ...
{
    test: /\.vue$/,
    loader: "vue-loader",
    options: {
        loaders: {
            scss: "vue-style-loader!css-loader!sass-loader"
        }
    }
}
// ...

So my main question is, how can I make the >>> operator work properly?

Although I came across this solution, implementing it isn't yielding the desired outcome for me...

Answer №1

Guide to Styling in Vue

Make sure to follow the correct styling conventions based on your Vue version.

Sass:   To style an element with a specific class, use ::v-deep

::v-deep .child-class {
    background-color: #000;
}

If you are not using Sass:   Use >>>

>>> .child-class {
    background-color: #000;
}

Regardless of the syntax used, remember to scope the styles within the <style> tag for the component:

<style scoped>

New Features in Vue 3 (and Vue 2.7)

In Vue 3, there is a new way to target elements for styling and the usage of deprecated selectors has changed.

Now, you can simply use the selector :deep(.child-class). This approach is recommended even if you are not using Sass.

:deep(.child-class) {
    background-color: #000;
}

This updated selector is also compatible with Vue 2.7.


Additional Selectors in Vue 3

Vue 3 introduces more advanced features for styling components that have slots or require global styles.

For slot content: Use :slotted(.child-class)

:slotted(.slot-class) {
    background-color: #000;
}

Moreover, Vue 3 allows registering global styles from a scoped component using :global(.my-class).

:global(.my-class) {
    background-color: #000;
}

To ensure consistency, always remember to scope the styles within the <style> tag for the component:

<style scoped>

Summary of Style Directives

In Vue 2:

  • Avoid using the deprecated /deep/ syntax
  • Utilize ::v-deep with Sass and >>> without Sass

In Vue 3:

  • Replace ::v-deep .child-class with :deep(.child-class)
  • Transition from ::v- prefix to :
  • Discontinue the use of >>>
  • Avoid relying on the deprecated /deep/ syntax
  • Embrace the new :slotted and :global selectors

Remember, regardless of the version or syntax, maintain scoped styles within the <style> tag:

<style scoped>

Answer №2

It is recommended to avoid using /deep/ and switch to ::v-deep

You can alter the CSS of any scoped component by utilizing a deep selector, although /deep/ will soon be deprecated.

For more information, refer to Vue's Github page - https://github.com/vuejs/vue-loader/issues/913

Opt for ::v-deep in this scenario, steering clear of the outdated /deep/ usage

Additional resources - Deep Selector

Simply inspect the class of the displayed element that you wish to modify using devtools in Chrome or any other browser console.

Then, within your consuming component, make the necessary modifications

<style scoped>
::v-deep .custom-component-class {
   background: red; //
}
</style>

Answer №3

After exploring various options, I found a successful way to implement /deep/ in Vue's scoped SCSS stylesheets using the following structure:

.main-wrapper {
  & /deep/ .inner-content {
    color: #333;
  }
}

Note: It's worth noting that /deep/ is on its way out, so if you encounter any issues with it, consider checking out the alternative method discussed in another answer involving ::v-deep.

Answer №4

The use of ::v-deep as a combinator is no longer supported. Please use the :deep() function instead.

:deep(.child-class) {
    background-color: #000;
}

Answer №5

In my experience, the solution that proved effective was

<style scoped>.  // tried sass and scss but they weren't effective
  >>> .deep-selector {
    ...
  }
</style>

Answer №6

While you won't find it in the official Documentation, the solution lies in ensuring that the component you're trying to access is not the root component. Simply wrap your single component in a <div> and apply ::v-deep on scoped scss as outlined by others.

Answer №7

To tackle this issue, I resolved it by including the following:

options: { styleIsolation: 'shared' }, // include this
methods: {
  yourFunc1 () {
  }
}
.pet-info{
  ::v-deep .title {
    width: 51px !important;
    background-color: red !important
  }
}

Implement this configuration within the components, similar to how methods are structured.

Answer №8

If you need to modify CSS properties for a specific element in Vue.js using Vuetify, the following methods have worked well for me:

<style scoped>
::v-deep .v-overlay__content {
    contain: none !important;
}
</style>

Alternatively, you can also use:

<style scoped>
>>> .v-overlay__content {
    contain: none !important;
}
</style>

Answer №9

Imagine you have a modal labeled 'approval modal' with the following HTML:

<v-dialog v-model="requestForApproveModal" class="approval-modal">
...
</v-dialog> 

To target child elements within this modal, you can use the following CSS code in the scoped style block:

<style scoped>
.approval-modal:deep(.v-alert__content){
  font-size: 18px;
}
</style>

It's worth mentioning that in this example, 'v-alert__content' selected with the deep selector pertains to Vuetify's alert component.

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