What is causing my Vue leave transition to malfunction?

Question

What is causing my Vue leave transition to malfunction?

Currently, I am utilizing vee validate for my form validation. Specifically, I have implemented vue transition to handle the display of validation errors in the following manner:

 <input type="text" name="name" v-validate="'required'">
<transition name="slide-fade">
  <div v-show="errors.has('name')">{{ errors.first('name') }}</div>
</transition>

For the CSS styling:

    .slide-fade-enter-active {
  transition: all .3s ease;
}
.slide-fade-leave-active {
  transition: all .8s cubic-bezier(1.0, 0.5, 0.8, 1.0);
}
.slide-fade-enter, .slide-fade-leave-to
/* .slide-fade-leave-active below version 2.1.8 */ {
  transform: translateX(10px);
  opacity: 0;
}

My concern lies in the fact that while the transition works smoothly when an error message is entering the screen, it fails to do so when the error message disappears. What could be causing this issue?

javascript vue.js vee-validate

Answer 1

Answer №1

The transition is in action. It may seem to disappear suddenly because there's no longer any errors.first('name') being displayed.

By adding another string alongside errors.first('name'), such as Error:, the situation becomes clearer.

Vue.use(VeeValidate);
new Vue({
  el: '#demo'
})

.slide-fade-enter-active {
  transition: all .3s ease;
}
.slide-fade-leave-active {
  transition: all .8s cubic-bezier(1.0, 0.5, 0.8, 1.0);
}
.slide-fade-enter, .slide-fade-leave-to
/* .slide-fade-leave-active below version 2.1.8 */ {
  transform: translateX(10px);
  opacity: 0;
}

<script src="https://unpkg.com/vue"></script>
<script src="https://cdn.jsdelivr.net/npm/vee-validate@latest/dist/vee-validate.js"></script>

<div id="demo">
  Type something and then erase. And then type again.
  <input type="text" name="name" v-validate="'required'">
  <transition name="slide-fade">
    <div v-show="errors.has('name')">Errors: {{ errors.first('name') }}</div>
  </transition>
</div>

If absolutely necessary...

Take into account the added complexity of the code, but if it cannot be avoided, you must include a watcher for the value of the input and capture the first error when it occurs.

As vee-validate does not offer error listeners, this is the current workaround. Refer to the demonstration below.

Vue.use(VeeValidate);
new Vue({
  el: '#demo',
  data: {
    name: "Erase me",
    nameError: ""
  },
  watch: {
    name() {
      // Wait for at least two ticks, as vee-validate requires one tick for validation
      Vue.nextTick().then(Vue.nextTick()).then(() => {
        if (this.errors.has('name')) { this.nameError = this.errors.first('name'); }
      });
    }
  }
})

.slide-fade-enter-active {
  transition: all .3s ease;
}
.slide-fade-leave-active {
  transition: all .8s cubic-bezier(1.0, 0.5, 0.8, 1.0);
}
.slide-fade-enter, .slide-fade-leave-to
/* .slide-fade-leave-active below version 2.1.8 */ {
  transform: translateX(10px);
  opacity: 0;
}

<script src="https://unpkg.com/vue"></script>
<script src="https://cdn.jsdelivr.net/npm/vee-validate@latest/dist/vee-validate.js"></script>

<div id="demo">
  Erase and an error will appear. Type again and the error will disappear.<br>
  <input type="text" name="name" v-validate="'required'" v-model="name">
  <transition name="slide-fade">
    <div v-show="errors.has('name')">Errors: {{ nameError }}</div>
  </transition>
</div>

Answer 2

The transition is in action. It may seem to disappear suddenly because there's no longer any errors.first('name') being displayed.

By adding another string alongside errors.first('name'), such as Error:, the situation becomes clearer.

Vue.use(VeeValidate);
new Vue({
  el: '#demo'
})

.slide-fade-enter-active {
  transition: all .3s ease;
}
.slide-fade-leave-active {
  transition: all .8s cubic-bezier(1.0, 0.5, 0.8, 1.0);
}
.slide-fade-enter, .slide-fade-leave-to
/* .slide-fade-leave-active below version 2.1.8 */ {
  transform: translateX(10px);
  opacity: 0;
}

<script src="https://unpkg.com/vue"></script>
<script src="https://cdn.jsdelivr.net/npm/vee-validate@latest/dist/vee-validate.js"></script>

<div id="demo">
  Type something and then erase. And then type again.
  <input type="text" name="name" v-validate="'required'">
  <transition name="slide-fade">
    <div v-show="errors.has('name')">Errors: {{ errors.first('name') }}</div>
  </transition>
</div>

If absolutely necessary...

Take into account the added complexity of the code, but if it cannot be avoided, you must include a watcher for the value of the input and capture the first error when it occurs.

As vee-validate does not offer error listeners, this is the current workaround. Refer to the demonstration below.

Vue.use(VeeValidate);
new Vue({
  el: '#demo',
  data: {
    name: "Erase me",
    nameError: ""
  },
  watch: {
    name() {
      // Wait for at least two ticks, as vee-validate requires one tick for validation
      Vue.nextTick().then(Vue.nextTick()).then(() => {
        if (this.errors.has('name')) { this.nameError = this.errors.first('name'); }
      });
    }
  }
})

.slide-fade-enter-active {
  transition: all .3s ease;
}
.slide-fade-leave-active {
  transition: all .8s cubic-bezier(1.0, 0.5, 0.8, 1.0);
}
.slide-fade-enter, .slide-fade-leave-to
/* .slide-fade-leave-active below version 2.1.8 */ {
  transform: translateX(10px);
  opacity: 0;
}

<script src="https://unpkg.com/vue"></script>
<script src="https://cdn.jsdelivr.net/npm/vee-validate@latest/dist/vee-validate.js"></script>

<div id="demo">
  Erase and an error will appear. Type again and the error will disappear.<br>
  <input type="text" name="name" v-validate="'required'" v-model="name">
  <transition name="slide-fade">
    <div v-show="errors.has('name')">Errors: {{ nameError }}</div>
  </transition>
</div>

Answer 3

Answer №2

While this topic may be considered old, I have come up with a simpler solution that requires minimal code. This solution is perfect for those who are still on the lookout.

The concept behind this solution involves checking for error messages every time a key is pressed in the input field using the @keypress event. The error message is then saved in a variable and displayed along with the actual error message in a div using an OR operator. This ensures that the error.message variable is never set to undefined. Even if the VeeValidate error message is not available, something will still be displayed until the animation completes.

Vue.use(VeeValidate);
new Vue({
  el: '#demo',

  data() {
    return {
      error: {
        name: null,
      },
    }
  },

  methods: {
    updateError() {
      const message = this.errors.first('name');

      if (message) { // check if message isn't undefined
        this.error.name = message;
      }
    },
  },
});

.slide-fade-enter-active {
  transition: all .3s ease;
}

.slide-fade-leave-active {
  transition: all .8s cubic-bezier(1.0, 0.5, 0.8, 1.0);
}

.slide-fade-enter,
.slide-fade-leave-to {
  transform: translateX(10px);
  opacity: 0;
}

<script src="https://unpkg.com/vue"></script>
<script src="https://cdn.jsdelivr.net/npm/vee-validate@latest/dist/vee-validate.js"></script>

<div id="demo">
  Type something and then erase. And then type again.
  <input type="text" name="name" v-validate="'required'" @keypress="updateError()"><!-- added keypress event -->
  <transition name="slide-fade">
    <div v-show="errors.has('name')">Errors: {{ errors.first('name') || error.name }}</div><!-- OR -->
  </transition>
</div>

If you have multiple inputs, you can modify the solution by passing the '$event' variable in the updateError() function (changing it to updateError($event)) and handling it in the declaration. By using srcElement, you can identify the source element of the keypress event (in our case, an input) and then manipulate its respective variables (such as error.name and error.email) based on its name/class/id. The process remains straightforward.

Vue.use(VeeValidate);
new Vue({
  el: '#demo',

  data() {
    return {
      error: {
        name: null,
        email: null,
      },
    }
  },

  methods: {
    updateError(e) {
      const input = e.srcElement.name;
      const message = this.errors.first(input);

      if (message) { // check if message isn't undefined
        if (input === 'name') {
          this.error.name = message;
        } else if (input === 'email') {
          this.error.email = message;
        }
      }
    },
  },
});

.row {
  display: flex;
  flex-wrap: wrap;
}

.col {
  flex: 0 0 45%;
  max-width: 45%;
}

.slide-fade-enter-active {
  transition: all .3s ease;
}

.slide-fade-leave-active {
  transition: all .8s cubic-bezier(1.0, 0.5, 0.8, 1.0);
}

.slide-fade-enter,
.slide-fade-leave-to {
  transform: translateX(10px);
  opacity: 0;
}

<script src="https://unpkg.com/vue"></script>
<script src="https://cdn.jsdelivr.net/npm/vee-validate@latest/dist/vee-validate.js"></script>

<div id="demo" class="row">
  <div class="col">
    Type a name and then erase. And then type again.
    <input type="text" name="name" v-validate="'required'" @keypress="updateError($event)">
    <!-- added keypress event -->
    <transition name="slide-fade">
      <div v-show="errors.has('name')">Errors: {{ errors.first('name') || error.name }}</div>
      <!-- OR -->
    </transition>
  </div>

  <div class="col" style="border-left: 2px solid black; padding-left: 10px">
    Type an email and then erase. And then type again.
    <input type="text" name="email" v-validate="'required'" @keypress="updateError($event)">
    <!-- added keypress event -->
    <transition name="slide-fade">
      <div v-show="errors.has('email')">Errors: {{ errors.first('email') || error.email }}</div>
      <!-- OR -->
    </transition>
  </div>
</div>

I trust this explanation has been beneficial to you!

Answer 4

While this topic may be considered old, I have come up with a simpler solution that requires minimal code. This solution is perfect for those who are still on the lookout.

The concept behind this solution involves checking for error messages every time a key is pressed in the input field using the @keypress event. The error message is then saved in a variable and displayed along with the actual error message in a div using an OR operator. This ensures that the error.message variable is never set to undefined. Even if the VeeValidate error message is not available, something will still be displayed until the animation completes.

Vue.use(VeeValidate);
new Vue({
  el: '#demo',

  data() {
    return {
      error: {
        name: null,
      },
    }
  },

  methods: {
    updateError() {
      const message = this.errors.first('name');

      if (message) { // check if message isn't undefined
        this.error.name = message;
      }
    },
  },
});

.slide-fade-enter-active {
  transition: all .3s ease;
}

.slide-fade-leave-active {
  transition: all .8s cubic-bezier(1.0, 0.5, 0.8, 1.0);
}

.slide-fade-enter,
.slide-fade-leave-to {
  transform: translateX(10px);
  opacity: 0;
}

<script src="https://unpkg.com/vue"></script>
<script src="https://cdn.jsdelivr.net/npm/vee-validate@latest/dist/vee-validate.js"></script>

<div id="demo">
  Type something and then erase. And then type again.
  <input type="text" name="name" v-validate="'required'" @keypress="updateError()"><!-- added keypress event -->
  <transition name="slide-fade">
    <div v-show="errors.has('name')">Errors: {{ errors.first('name') || error.name }}</div><!-- OR -->
  </transition>
</div>

If you have multiple inputs, you can modify the solution by passing the '$event' variable in the updateError() function (changing it to updateError($event)) and handling it in the declaration. By using srcElement, you can identify the source element of the keypress event (in our case, an input) and then manipulate its respective variables (such as error.name and error.email) based on its name/class/id. The process remains straightforward.

Vue.use(VeeValidate);
new Vue({
  el: '#demo',

  data() {
    return {
      error: {
        name: null,
        email: null,
      },
    }
  },

  methods: {
    updateError(e) {
      const input = e.srcElement.name;
      const message = this.errors.first(input);

      if (message) { // check if message isn't undefined
        if (input === 'name') {
          this.error.name = message;
        } else if (input === 'email') {
          this.error.email = message;
        }
      }
    },
  },
});

.row {
  display: flex;
  flex-wrap: wrap;
}

.col {
  flex: 0 0 45%;
  max-width: 45%;
}

.slide-fade-enter-active {
  transition: all .3s ease;
}

.slide-fade-leave-active {
  transition: all .8s cubic-bezier(1.0, 0.5, 0.8, 1.0);
}

.slide-fade-enter,
.slide-fade-leave-to {
  transform: translateX(10px);
  opacity: 0;
}

<script src="https://unpkg.com/vue"></script>
<script src="https://cdn.jsdelivr.net/npm/vee-validate@latest/dist/vee-validate.js"></script>

<div id="demo" class="row">
  <div class="col">
    Type a name and then erase. And then type again.
    <input type="text" name="name" v-validate="'required'" @keypress="updateError($event)">
    <!-- added keypress event -->
    <transition name="slide-fade">
      <div v-show="errors.has('name')">Errors: {{ errors.first('name') || error.name }}</div>
      <!-- OR -->
    </transition>
  </div>

  <div class="col" style="border-left: 2px solid black; padding-left: 10px">
    Type an email and then erase. And then type again.
    <input type="text" name="email" v-validate="'required'" @keypress="updateError($event)">
    <!-- added keypress event -->
    <transition name="slide-fade">
      <div v-show="errors.has('email')">Errors: {{ errors.first('email') || error.email }}</div>
      <!-- OR -->
    </transition>
  </div>
</div>

I trust this explanation has been beneficial to you!

What is causing my Vue leave transition to malfunction?

Answer №1

If absolutely necessary...

Answer №2

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