A Vue.js directive for animating an element from height: auto to height: 0px and vice-versa.

• 👻 3kb (1kb gzipped)
• 📦 No dependencies
• 🌚 TypeScript support
• ⚙ Uses CSS transitions
• 🕺 Support for custom easings

• Overview
• Demo
• Installation
• Usage
• Accessibility
• Browser Support
• Support
• Contributing

There is no pure CSS way to animate an element to or from height: auto, this Vue.js directive solves this. It works the same way as v-show but will show the element with a sliding animation.

Demo can be viewed here: http://v-show-slide.peterhegman.com/
Source code for demo can be viewed in src/Demo.vue

yarn add v-show-slide

npm install v-show-slide --save

In your main JS file first import this plugin

import VShowSlide from 'v-show-slide'

Install the plugin

Vue.use(VShowSlide)

Once the plugin is installed the v-show-slide directive can be used in any of your components. This directive works the same way as v-show. If the value is true the element will slide open, if the value is false the element will slide closed.

Example:

<template>
  <div id="app" class="app">
    <ul id="features" v-show-slide="featuresOpen" class="features">
      <li>Aliquam lorem</li>
      <li>Praesent porttitor nulla vitae posuere</li>
      <li>Suspendisse nisl elit rhoncus</li>
      <li>Donec mi odio faucibus</li>
      <li>Curabitur suscipit suscipit</li>
    </ul>
    <button
      @click="toggleFeatures"
      class="toggle-features"
      aria-controls="features"
      :aria-expanded="featuresOpen ? 'true' : 'false'"
    >
      {{ featuresOpen ? 'Hide Features' : 'View Features' }}
    </button>
  </div>
</template>

<script>
export default {
  name: 'App',
  data() {
    return {
      featuresOpen: false,
    }
  },
  methods: {
    toggleFeatures() {
      this.featuresOpen = !this.featuresOpen
    },
  },
}
</script>

By default duration is set to 300ms and easing is set to ease.

To override this, duration and easing can be passed as arguments to the directive. Duration should be defined in milliseconds. Built in easing options are: linear, ease, ease-in, ease-out, ease-in-out

Duration and easing can be set in this format v-show-slide:duration:easing

Example:

<ul v-show-slide:400:ease-in="featuresOpen" class="features">
  <li>Aliquam lorem</li>
  <li>Praesent porttitor nulla vitae posuere</li>
  <li>Suspendisse nisl elit rhoncus</li>
  <li>Donec mi odio faucibus</li>
  <li>Curabitur suscipit suscipit</li>
</ul>

If you want to define custom easing using cubic-bezier this can be done when installing the plugin. Pass an options object as the second parameter in Vue.use.

Example:

Vue.use(VShowSlide, {
  customEasing: {
    exampleEasing: 'cubic-bezier(0.68, -0.55, 0.265, 1.55)',
  },
})

Your custom easing can then be used like so (make sure to convert easing name to kebab-case):

v-show-slide:400:example-easing

Events are fired on the same element the directive was defined on. Below are the available events:

Example:

<template>
  <div id="app" class="app">
    <ul
      id="features"
      v-show-slide="featuresOpen"
      class="features"
      @slide-open-start="slideOpenStart"
      @slide-open-end="slideOpenEnd"
      @slide-close-start="slideCloseStart"
      @slide-close-end="slideCloseEnd"
    >
      <li>Aliquam lorem</li>
      <li>Praesent porttitor nulla vitae posuere</li>
      <li>Suspendisse nisl elit rhoncus</li>
      <li>Donec mi odio faucibus</li>
      <li>Curabitur suscipit suscipit</li>
    </ul>
    <button
      @click="toggleFeatures"
      class="toggle-features"
      aria-controls="features"
      :aria-expanded="featuresOpen ? 'true' : 'false'"
    >
      {{ featuresOpen ? 'Hide Features' : 'View Features' }}
    </button>
  </div>
</template>

<script>
export default {
  name: 'App',
  data() {
    return {
      featuresOpen: false,
    }
  },
  methods: {
    toggleFeatures() {
      this.featuresOpen = !this.featuresOpen
    },
    slideOpenStart() {
      console.log('Slide Open Start')
    },
    slideOpenEnd() {
      console.log('Slide Open End')
    },
    slideCloseStart() {
      console.log('Slide Close Start')
    },
    slideCloseEnd() {
      console.log('Slide Close End')
    },
  },
}
</script>

This directive will prevent child elements of the sliding element from being focusable when closed. Other than that it does not handle any other aspects of a11y such as adding or removing of aria attributes. Check out the WAI-ARIA Authoring Practices for more information. The most basic setup is to use aria-expanded and aria-controls as shown in the above example.

IE / Edge	Firefox	Chrome	Safari	iOS Safari
IE11, Edge	✅	✅	✅	> iOS 9

Please open an issue for support.

Please contribute using Github Flow. Create a branch, add commits, and open a pull request.