[Vuejs]-V-calendar datepicker date range event after first date is picked

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In the end I solved this by doing the following:

  1. Add an @input event to handle when date range is selected properly
  2. Add a @dayclick event to add the entered class when a day is selected
  3. Add a timeout to the handleBlur method (the @dayClick event seemed to take a bit of time to fire so the blur animation started before it kicked in)
  4. Add a mutation observer to see if the calendar closes – as the calendar doesn’t have a close event, I needed to see if the calendar was closed without valid date range selected – if this happened and the inputs were emptied, this observer removed the entered class
new Vue({
  el: "#app",
  data() {
    return {
      range: {
        start: null,
        end: null
      }
    };
  },
  mounted() {
    const overlay = document.querySelector('.filter__overlay');

    const config = {
      attributes: false,
      childList: true,
      subtree: true
    };

    // watch to see if calendar is closed
    const observer = new MutationObserver(mutationsList => {
      mutationsList.forEach(mutation => {
        if (mutation.type === 'childList' &&
          mutation.removedNodes.length > 0 &&
          mutation.removedNodes[0].classList &&
          mutation.removedNodes[0].classList.contains('vc-popover-content')) {
          removeClass(this.$refs.filterDateForm);
          removeClass(this.$refs.filterDateTo);
        }
      });
    });

    observer.observe(overlay, config);
  },
  methods: {
    handleBlur(event) {
      const input = event.currentTarget;
      setTimeout(() => {
        removeClass(input);
      }, 150);

    },
    handleFocus(event) {
      event.currentTarget.parentNode.classList.add("entered");
    },
    handleCalendarBlur() {
      changeClass(this.$refs.filterDateForm);
      changeClass(this.$refs.filterDateTo);
    },
    handleCalendarClick() {
      this.$refs.filterDateForm.parentNode.classList.add("entered");
      this.$refs.filterDateTo.parentNode.classList.add("entered");
    },
  }
});

function removeClass(input) {
  if (input.value === '') {
    input.parentNode.classList.remove("entered");
  }
}

function changeClass(input) {
  if (input.value === '') {
    input.parentNode.classList.remove("entered");
  } else {
    input.parentNode.classList.add("entered");
  }
}
@import url 'https://unpkg.com/v-calendar@2.3.4/lib/v-calendar.min.css';
.filter__date-range-holder {
  display: flex;
  justify-content: space-between;
  width: 95%;
}

.filter__date-range-column {
  width: calc(50% - 15px);
}

.form__row {
  position: relative;
  margin: 1.5em 0;
  background: white;
}

.form__control {
  width: 100%;
  border: 1px solid grey;
  font-size: 1rem;
  line-height: 1.5rem;
  color: black;
  padding: 0.75em;
  background: transparent;
}

.invalid .form__control {
  border-color: red;
  outline-color: red;
}

.form__control:focus {
  border-radius: 0;
}

.form__label {
  display: inline-block;
  position: absolute;
  top: 50%;
  left: calc(0.75em + 1px);
  transform: translateY(-50%);
  z-index: 1;
  color: black;
  background: white;
  transition: all 0.25s ease-in-out;
  pointer-events: none;
}

.entered .form__label {
  top: 0;
  left: 0.5rem;
  font-size: 0.6875rem;
  line-height: 0.6875rem;
  padding: 0.2em;
}

.invalid .form__label {
  color: red;
}
<script src="https://unpkg.com/vue@2.6.14/dist/vue.js"></script>
<script src="https://unpkg.com/v-calendar@2.3.4/lib/v-calendar.umd.min.js"></script>
<div id='app'>
  <div class="filter__overlay">
    <v-date-picker v-model="range" :popover="{ visibility: 'focus' }" is-range @input="handleCalendarBlur" @dayclick="handleCalendarClick">
      <template #default="{ inputValue, inputEvents }">
          <div class="filter__date-range-holder">
            <div class="filter__date-range-column">
              <div class="form__row filter__date-range-row">
                <label class="form__label filter__date-range-label" for="filter-date-from">From</label>
                <input id="filter-date-from" ref="filterDateForm" type="text" name="from" class="form__control form__control--textbox" :value="inputValue.start" v-on="inputEvents.start" @focus="handleFocus" @blur="handleBlur">
              </div>
            </div>
            <div class="filter__date-range-column">
              <div class="form__row filter__date-range-row">
                <label class="form__label filter__date-range-label" for="filter-date-to">To</label>
                <input id="filter-date-to" ref="filterDateTo" type="text" name="to" class="form__control form__control--textbox" :value="inputValue.end" v-on="inputEvents.start" @focus="handleFocus" @blur="handleBlur">
              </div>
            </div>
          </div>
        </template>
    </v-date-picker>
  </div>
</div>

Please note this example works differently to the one in my site – for some reason the one in my site will remove the dates from the inputs if only one date is selected – this one seems to keep it

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