Vue.js 3.0 Tutorial

Vue.js 3.0 Component Advanced

Vue.js 3.0 Transitions & Animations

Vue.js 3.0 Reusable & Combinable

Vue.js 3.0 Advanced

Vue.js 3.0 Tools

Vue.js 3.0 Scale

Vue.js 3.0 Accessibility

Vue.js 3.0 Migrating from Vue2

Vue.js 3.0 Contribute Documentation

Vue.js 3.0 API References

Vue.js 3.0 Style Guide

Vue 3.0 Style Guide

Vue 3.0 state transitions

Transitioning state changes can greatly improve the user experience of your application. Vue provides a variety of ways to apply transition effects when items are inserted, updated, or removed from the DOM.

In Vue 3, we can use the built-in <transition> and <transition-group> components to apply automatic transition effects.

Here is a simple example of a fade transition on a Vue 3 component:

<template>
  <button @click="show = !show">
    Toggle
  </button>
  <transition name="fade">
    <p v-if="show">hello</p>
  </transition>
</template>

<script>
import { ref } from 'vue';

export default {
  setup() {
    const show = ref(true);
    return { show };
  }
}
</script>

<style scoped>
.fade-enter-active, .fade-leave-active {
  transition: opacity .5s;
}
.fade-enter, .fade-leave-to {
  opacity: 0;
}
</style>

In the example above, we have a paragraph that we want to show and hide with a fade effect. We use the <transition> component to wrap the paragraph, and give the transition a name "fade". The name "fade" will be used to generate CSS classes that apply during the transition.

Let's break down the generated CSS classes:

.fade-enter-active and .fade-leave-active: These classes are added during the entire entering and leaving phases. It's a good place to set the duration, delay and easing curve for the transition.
.fade-enter and .fade-leave-to: These classes are added at the start of the entering phase and at the end of the leaving phase. It's a good place to define the starting state of your transition.

In this case, we're using these classes to animate the opacity of the paragraph from 0 to 1 when entering, and from 1 to 0 when leaving. The transition lasts for .5s as defined in .fade-enter-active and .fade-leave-active.

This is a basic example of how you can transition state changes in Vue 3. The <transition> component is quite flexible and can handle more complex animations and even integrate with JavaScript animation libraries. For more advanced usage, check out the Vue documentation.

Handling State Transitions in Vue 3.0: Vue 3.0 provides built-in transition features to animate state changes.
```
<transition name="fade" mode="out-in">
 I will fade
</transition>
```
Vue 3.0 Transition Modes: The mode attribute in <transition> determines how elements are inserted/removed. Modes include "in-out" and "out-in."
```
<transition name="fade" mode="out-in">
 I will fade
</transition>
```

CSS Transitions in Vue 3.0: Use CSS for transition effects. Vue adds classes like v-enter, v-enter-active, v-enter-to, etc.

<style>
  .fade-enter-active, .fade-leave-active {
    transition: opacity 1s;
  }
  .fade-enter, .fade-leave-to {
    opacity: 0;
  }
</style>

Vue 3.0 Transition Events: Vue emits transition events like @before-enter, @enter, @after-enter, etc., for custom logic.

<transition
  @before-enter="beforeEnter"
  @enter="enter"
  @after-enter="afterEnter"
>
  <p v-if="show">I will fade</p>
</transition>

Vue 3.0 Transition Hooks: Utilize transition hooks (beforeEnter, enter, afterEnter, etc.) for custom logic.
```
methods: {
  beforeEnter(el) {
    // ...
  },
  enter(el, done) {
    // ...
    done();
  },
}
```

Vue 3.0 Transition CSS Classes Binding: Dynamically bind CSS classes based on transition states.

<transition :class="{ 'fade-custom': isCustomFade }">
  <p v-if="show">I will fade</p>
</transition>

Dynamic State Transitions in Vue 3.0: Change transition type dynamically based on data.
```
<transition :name="transitionType">
 I will fade
</transition>
```

Customizing Transition Duration in Vue 3.0: Customize transition duration dynamically.

<transition :duration="{ enter: 1000, leave: 500 }">
  <p v-if="show">I will fade</p>
</transition>

Vue 3.0 transition-group Component: Use <transition-group> for lists, applying transitions to each item.

<transition-group name="list" tag="ul">
  <li v-for="item in items" :key="item.id">{{ item.text }}</li>
</transition-group>

Vue 3.0 Handling Enter and Exit Transitions: Handle enter and exit transitions separately using @before-enter, @enter, etc.
```
<transition
 @before-enter="beforeEnter"
 @enter="enter"
>
 I will fade
</transition>
```
Vue 3.0 Conditional State Transitions: Use conditional rendering for dynamic state transitions.
```
<transition name="fade">
 I will fade
</transition>
```

Staggering State Transitions in Vue 3.0: Apply staggering to transitions using v-enter and v-leave classes.

<transition name="fade" @before-enter="beforeEnter">
  <p v-if="show" v-for="item in items" :key="item.id">{{ item.text }}</p>
</transition>