When loading a page for the first time, the Vue.js transition does not take effect

After setting up a navbar that switches between two components, I encountered an issue with the fade-in animation not running when the page is first opened. The animation only works when using the navbar links to switch components. Any suggestions on how to fix this?

P.S. The components in question are simply <h1>Home</h1> and <h1>About</h1>.

HTML:

<div id="app">
  <transition name="view">
      <router-view/>
  </transition>
</div>

JS (Router):

Vue.use(Router)

export default new Router({
  routes: [
    {
      path: '/',
      redirect: { name: 'home-route' }
    },
    {
      path: '/home',
      name: 'home-route',
      component: HomeComponent
    },
    {
      path: '/about',
      name: 'about-route',
      component: AboutComponent
    }
  ]
})

CSS (Animation):

.view-leave-active {
    transition: opacity 0.5s ease-in-out, transform 0.5s ease;
}

.view-enter-active {
    transition: opacity 0.5s ease-in-out, transform 0.5s ease;
    transition-delay: 0.5s;
}

.view-enter, .view-leave-to {
    opacity: 0;
}

.view-enter-to, .view-leave {
    opacity: 1;
}

Answer №1

To achieve a fade effect, simply include the "appear" attribute within the transition wrapper.
Additionally, make sure to have your own CSS classes defined for the animation or transition.
Here's an example:

<transition name="fade" appear></transition>

Answer №2

When a page loads, view transitions do not automatically work because the content has not been initialized yet.

To trigger the transition, you will need to find an alternative method. There are several options to consider.

  1. To hide the component by default using a data prop and then switch it to true in the mounted lifecycle. This should activate the transition.
<div v-if="show"></div>
data() {
    return {
      show: false
    }
  },
  mounted() {
    this.show = true; // may require this.$nextTick
  }

  1. You can also opt for a regular CSS transition.

Similar to the previous method, apply a class with styles to the parent element.

opacity: 0;
transition: opacity 0.5s ease-in-out;

Then, add a class on mount to change the opacity to 1.

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