Is there a way to turn off vue.js transitions specifically for testing purposes?

Question

Is there a way to turn off vue.js transitions specifically for testing purposes?

I'm utilizing a vue.js component with the <transition> element for show/hide animations. However, I want to disable the animation for faster testing. How can I achieve this?

The solution proposed is

* { transition: none !important }

in this link: https://github.com/vuejs/vue/issues/463, but it doesn't seem to work.

You can check out my fiddle here: https://jsfiddle.net/z11fe07p/2268/

When running the "test," the final output shows "3. Display should be 'none', it is: block." Increasing the timeout or removing the <transition> element gives the expected result of "3. Display should be 'none,' it is: none."

Could someone guide me on how to disable the animation and eliminate the need for setTimeout calls?

UPDATE:

I've tried removing all CSS styling without any success. Hence, the issue seems to stem from having the <transition> element alone.

UPDATE 2:

I've revised the fiddle to contain only the <transition> element along with calls to $nextTick() to rule out any odd behavior causes.

If you modify the call from wait100 to wait10, you'll notice that the test begins to fail.

https://jsfiddle.net/z11fe07p/2270/

UPDATE 3:

Sharing the example code below for easier experimentation :)

new Vue({
  el: '#app',
  template: `
    <span>
      <button @click="test()">Run test</button>
      <transition>
        <p v-show="show">Hello, world!</p>
      </transition>
    </span>
  `,
  data() {
    return {
      show: false,
    };
  },
  methods: {
    test() {
      const wait10 = _ => new Promise(resolve => setTimeout(resolve, 10));
      const wait100 = _ => new Promise(resolve => setTimeout(resolve, 100));
      const showParagraph = _ => this.show = true;
      const hideParagraph = _ => this.show = false;
      const p = document.querySelector('p');

      showParagraph();

      this.$nextTick()
        .then(wait10)
        .then(() => {
          const display = getComputedStyle(p).display;
          assertEqual(display, 'block');
        })
        .then(hideParagraph)
        .then(this.$nextTick)
        .then(wait100)
        .then(() => {
          const display = getComputedStyle(p).display;
          assertEqual(display, 'none');
        });
    }
  }
});

function assertEqual(a, b) { 
  if (a !== b) {
    console.error('Expected "' + a + '" to equal "' + b + '"');
  }
};

<script src="//cdnjs.cloudflare.com/ajax/libs/vue/2.3.4/vue.min.js"></script>
<div id="app"></div>

javascript css animation vue.js vuejs2

Answer 1

Answer №1

Whenever the environment is set to testing, I convert all my transition and transition-group elements into a div using render functions.

if (process.env.NODE_ENV === 'testing') {
  const div = {
    functional: true,
    render: (h, { data, children }) => h('div', data, children),
  }

  Vue.component('transition', div)
  Vue.component('transition-group', div)
}

Answer 2

Whenever the environment is set to testing, I convert all my transition and transition-group elements into a div using render functions.

if (process.env.NODE_ENV === 'testing') {
  const div = {
    functional: true,
    render: (h, { data, children }) => h('div', data, children),
  }

  Vue.component('transition', div)
  Vue.component('transition-group', div)
}

Answer 3

Answer №2

Encountered an issue with the <transition-group> element, and my workaround involved substituting it during testing using the provided code snippet.

Vue.component('transition-group', {
    props: ['tag'],
    render(createElement) {
        return createElement(this.tag || this.$vnode.data.tag || 'span', this.$slots.default);
    },
});

This script essentially transforms <transition-group> into a replica of <slot> with an optional tag that can be defined dynamically.

A similar approach might be necessary for <transition>, although it could be even more straightforward as <transition> lacks the tag prop altogether.

Answer 4

Encountered an issue with the <transition-group> element, and my workaround involved substituting it during testing using the provided code snippet.

Vue.component('transition-group', {
    props: ['tag'],
    render(createElement) {
        return createElement(this.tag || this.$vnode.data.tag || 'span', this.$slots.default);
    },
});

This script essentially transforms <transition-group> into a replica of <slot> with an optional tag that can be defined dynamically.

A similar approach might be necessary for <transition>, although it could be even more straightforward as <transition> lacks the tag prop altogether.

Answer 5

Answer №3

Although my use case was a bit different, the end goal remained the same: I needed to disable specific transition effects on mobile devices.

The solution I came up with was to encapsulate the functionality into a component. This approach would also be beneficial for testing purposes (especially if the 'disable' property was set based on something like process.env.NODE_ENV === 'testing').

<template>
  <transition v-if="!disable" :name="name" :mode="mode">
    <slot></slot>
  </transition>
  <div v-else>
    <slot></slot>
  </div>
</template>

<script>
export default {
  props: {
    disable: Boolean,
    name: String,
    mode: String,
  },
};
</script>

For testing purposes only, I believe that Bill Criswell's answer is likely the most straightforward and elegant solution.

Answer 6

Although my use case was a bit different, the end goal remained the same: I needed to disable specific transition effects on mobile devices.

The solution I came up with was to encapsulate the functionality into a component. This approach would also be beneficial for testing purposes (especially if the 'disable' property was set based on something like process.env.NODE_ENV === 'testing').

<template>
  <transition v-if="!disable" :name="name" :mode="mode">
    <slot></slot>
  </transition>
  <div v-else>
    <slot></slot>
  </div>
</template>

<script>
export default {
  props: {
    disable: Boolean,
    name: String,
    mode: String,
  },
};
</script>

For testing purposes only, I believe that Bill Criswell's answer is likely the most straightforward and elegant solution.

Answer 7

Answer №4

If you want to indicate testing in Vue, you can set a variable and configure transition hooks to stop when testing. A useful approach is using a checkbox to toggle the testing variable for consistent test results.

In my case, I made adjustments to my code by separating the fadeTransition into its own component with a slot. However, I still have not figured out how to remove the extra markup in the template.

new Vue({
  el: '#app',
  template: `
    <span>
      <input type="checkbox" v-model="Vue.testing"> Testing<br>
      <button @click="test()">Run test</button>
      <fade-transition>
        <p id="transition" v-show="show">Hello, world!</p>
      </fade-transition>
    </span>
  `,
  components: {
    fadeTransition: {
      template: `
      <transition name="fade"
        @enter="killTransition"
        @leave="killTransition"
      ><slot></slot>
      </transition>
      `,
      methods: {
        killTransition(el, done) {
          if (Vue.testing) done();
        }
      }
    }
  },
  data() {
    return {
      show: false,
      testing: true
    };
  },
  methods: {
    test() {
      const p = document.querySelector('#transition');

      let display = getComputedStyle(p).display;
      console.log('1. Display should be "none", it is:', display);

      this.show = true;
      this.$nextTick(() => {
        display = getComputedStyle(p).display;
        console.log('2. Display should be "block", it is:', display);

        this.show = false;

        this.$nextTick(() => {
          display = getComputedStyle(p).display;
          console.log('3. Display should be "none", it is:', display);
        });
      });
    }
  }
});

.fade-enter-active,
.fade-leave-active{
  transition: opacity .5s;
}

.fade-enter,
.fade-leave-to{
  opacity: 0
}

<script src="//cdnjs.cloudflare.com/ajax/libs/vue/2.3.4/vue.min.js"></script>
<div id="app"></div>

Answer 8

If you want to indicate testing in Vue, you can set a variable and configure transition hooks to stop when testing. A useful approach is using a checkbox to toggle the testing variable for consistent test results.

In my case, I made adjustments to my code by separating the fadeTransition into its own component with a slot. However, I still have not figured out how to remove the extra markup in the template.

new Vue({
  el: '#app',
  template: `
    <span>
      <input type="checkbox" v-model="Vue.testing"> Testing<br>
      <button @click="test()">Run test</button>
      <fade-transition>
        <p id="transition" v-show="show">Hello, world!</p>
      </fade-transition>
    </span>
  `,
  components: {
    fadeTransition: {
      template: `
      <transition name="fade"
        @enter="killTransition"
        @leave="killTransition"
      ><slot></slot>
      </transition>
      `,
      methods: {
        killTransition(el, done) {
          if (Vue.testing) done();
        }
      }
    }
  },
  data() {
    return {
      show: false,
      testing: true
    };
  },
  methods: {
    test() {
      const p = document.querySelector('#transition');

      let display = getComputedStyle(p).display;
      console.log('1. Display should be "none", it is:', display);

      this.show = true;
      this.$nextTick(() => {
        display = getComputedStyle(p).display;
        console.log('2. Display should be "block", it is:', display);

        this.show = false;

        this.$nextTick(() => {
          display = getComputedStyle(p).display;
          console.log('3. Display should be "none", it is:', display);
        });
      });
    }
  }
});

.fade-enter-active,
.fade-leave-active{
  transition: opacity .5s;
}

.fade-enter,
.fade-leave-to{
  opacity: 0
}

<script src="//cdnjs.cloudflare.com/ajax/libs/vue/2.3.4/vue.min.js"></script>
<div id="app"></div>

Answer 9

Answer №5

While not the most straightforward approach for testing, there are alternative scenarios where utilizing v-bind to connect a transition name without an associated CSS transition can be beneficial.

v-bind:name="my-var"

this.myVar = “None”

Answer 10

While not the most straightforward approach for testing, there are alternative scenarios where utilizing v-bind to connect a transition name without an associated CSS transition can be beneficial.

v-bind:name="my-var"

this.myVar = “None”

Is there a way to turn off vue.js transitions specifically for testing purposes?

Answer №1

Answer №2

Answer №3

Answer №4

Answer №5

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