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HTML

              
                <div id="app">
  <div class="container">
    <Calendar />
  </div>
</div>
              
            
!

CSS

              
                html, body {
  margin: 0;
  font-family: 'Google Sans', 'Avenir';
}

#app {
  height: 100vh;
  width: 100%;
  background-color: #db3955;
  display: flex;
  justify-content: center;
  box-sizing: border-box;
  padding: 10vh 0;
  .container {
    width: 300px;
    height: auto;
    font-size: 20px;
    text-align: center;
    border-radius: 4px;
    padding: 20px;
  }
  input[type="text"] {
    width: 100%;
    box-sizing: border-box;
    padding: 10px;
    background: #db3955;
    border: 2px solid #fff;
    border-radius: 4px;
    color: #fff;
    font-family: 'Google Sans';
    &:focus {
      outline: none;
      border: 2px solid #fff;
    }
    &::placeholder {
      color: #e9e9e9;
      font-style: italic;
    }
  }
}

.calendar {
  width: 100%;
  position: relative;
  .calendar-layout {
    position: absolute;
    z-index: 1;
    width: 100%;
    display: flex;
    flex-direction: column;
    animation: appear .3s ease forwards;
    .calendar-header {
      width: 100%;
      background-color: #FF4364;
      height: 60px;
      display: flex;
      flex-direction: column;
      align-items: center;
      color: #fff;
      box-sizing: border-box;
      padding: 0 4px;
      .row {
        width: 100%;
        height: 40px;
        display: flex;
        flex-direction: row;
        justify-content: space-between;
        align-items: center;
        .calendar-title {
          font-size: 16px;
        }
        i {
          font-size: 16px;
          cursor: pointer;
        }
      }
      .calendar-days {
        display: flex;
        justify-content: space-between;
        width: 100%;
        font-size: 14px;
        .day {
          max-width: calc(100% / 7);
          padding: 4px;
          text-overflow: ellipsis;
          overflow: hidden;
        }
      }
    }
    .calendar-body {
      display: flex;
      flex-direction: column;
      background-color: #fff;
      overflow: hidden;
      .calendar-row {
        display: flex;
        flex-direction: row;
        transition: all .150s ease;
        .calendar-day {
          width: calc(100% / 7);
          display: flex;
          justify-content: center;
          align-items: center;
          border: 1px solid #f9f9f9;
          font-size: 14px;
          color: #606060;
          position: relative;
          cursor: pointer;
          transition: all .3s ease;
          &.disabled {
            background-color: #f3f3f3 !important;
          }
          &.selected {
            color: #FF4364;
            &:after {
              width: 100%;
            }
          }
          &:after {
            content: "";
            height: 3px;
            width: 0px;
            background: #FF4364;
            position: absolute;
            bottom: 0;
            transition: all .3s ease;
          }
          &:hover {
            color: #FF4364;
          }
          &:hover:after {
            width: 100%;
          }
        }
        &.swipe-left {
          opacity: 0;
          transform: translateX(10px);
        }
        &.swipe-right {
          opacity: 0;
          transform: translateX(-10px);
        }
      }
    }
    .calendar-footer {
    }
  }
}

@keyframes appear {
  from {
    transform: translateY(-10px);
    opacity: 0;
  } to {
    transform: translateY(5px);
    opacity: 1;
  }
}

              
            
!

JS

              
                Vue.component("calendar", {
  template: `
  <div class="calendar">
    <input
      type="text"
      v-model="date"
      @focus="focus()"
      @blur="blur()"
      placeholder="Pick a date"
    >
    <div 
      class="calendar-layout"
      v-if="active"
      @mousedown.prevent
    >
      <div class="calendar-header">
        <div class="row">
          <i 
            class="material-icons"
            @click="setPreviousMonth()"
          >
            chevron_left
          </i>
          <div class="calendar-title">
            {{ monthYearFormatted }}
          </div>
          <i
            class="material-icons"
            @click="setNextMonth()"
          >
            chevron_right
          </i>
        </div>
        <div class="calendar-days">
          <div 
            class="day"
            v-for="day in days"
            :key="day"
          >
            {{ day | trimThreeChar }}
          </div>
        </div>
      </div>
      <div class="calendar-body">
        <div 
          class="calendar-row"
          v-bind:class="{ 'swipe-left': swipeLeft, 'swipe-right': swipeRight }"
          v-for="(row, index) in calendarDays"
          :key="index"
        >
          <div 
            class="calendar-day"
            :class="{disabled: isDisabled(cell), selected: isSelected(cell)}"
            v-bind:style="{height: cellHeightUnit}"
            v-for="(cell, index) in row"
            :key="index"
            @click="selectDay(cell)"
          >
            {{ cell.day }}
          </div>
        </div>
      </div>
      <div class="calendar-footer">
      </div>
    </div>
  </div>
  `,
  data: () => ({
    date: '',
    activeDate: '201901',
    activeDay: '',
    active: false,
    days: ['Lundi', 'Mardi', 'Mercredi', 'Jeudi', 'Vendredi', 'Samedi', 'Dimanche'],
    monthes: {
      '01': 'Janvier',
      '02': 'Février',
      '03': 'Mars',
      '04': 'Avril',
      '05': 'Mai',
      '06': 'Juin',
      '07': 'Juillet',
      '08': 'Août',
      '09': 'Septembre',
      '10': 'Octobre',
      '11': 'Novembre',
      '12': 'Décembre',
    },
    calendarDays: [],
    cellHeight: '',
    swipeLeft: false,
    swipeRight: false
  }),
  filters: {
    trimThreeChar(item) {
      return item.substr(0, 3);
    }
  },
  computed: {
    monthYearFormatted() {
      // Returns the current month name followed by the current year
      return this.monthes[this.activeDate.substr(4, 2)] + ' ' + this.activeDate.substr(0, 4);
    },
    cellHeightUnit() {
      return this.cellHeight + 'px';
    }
  },
  methods: {
    focus() {
      this.active = true;
      this.cellHeight = (this.$el.querySelector('input').offsetWidth) / 7;
    },
    blur() {
      this.active = false;
    },
    getCurrentDate() {
      // Returns today's date with format YYYY/MM/DD
      return new Date().toJSON().slice(0,10).replace(/-/g,'/');
    },
    getCurrentDay() {
      // Returns current day within range 1-31
      return new Date().getDate();
    },
    getCurrentMonth() {
      // Returns the current month as a 2 digits number
      return ( "0" + (new Date().getMonth() + 1)).slice(-2);
    },
    getPreviousMonth(month) {
      if (parseInt(month) == 1)
        return '12';
      else 
        return ( "0" + (parseInt(month) - 1)).slice(-2);
    },
    getNextMonth(month) {
      if (parseInt(month) == 12)
        return '01';
      else 
        return ( "0" + (parseInt(month) + 1)).slice(-2);
    },
    getCurrentYear() {
      // Returns the current year as a 4 digits number
      return new Date().getFullYear();
    },
    getNumberOfDaysInMonth(year, month) {
      return new Date(year, month, 0).getDate();
    },
    getNumberOfDaysInPreviousMonth(year, month) {
        if (month == '01') 
          return new Date(year - 1, this.getPreviousMonth(month), 0).getDate();
        else
          return new Date(year, this.getPreviousMonth(month), 0).getDate();
    },
    getNumberOfDaysInNextMonth() {
      if (this.getNextMonth() == '12')
        return new Date(this.getCurrentYear() + 1, this.getNextMonth(), 0).getDate();
      else
        return new Date(this.getCurrentYear(), this.getNextMonth(), 0).getDate();
    },
    getFirstDayOfMonth(year, month) {
      if (new Date(year, parseInt(month) - 1, 1).getDay() - 1 == -1)
        return 6
      else 
        return new Date(year, parseInt(month) - 1, 1).getDay() - 1;
    },
    getLastDayOfMonth(year, month) {
      return new Date(year, parseInt(month) + 1, 0).getDay();
    },
    populateCalendar(year, month) {
      this.calendarDays = [];
      const firstDayOfMonth = this.getFirstDayOfMonth(year, month);
      const numberOfRows = Math.ceil(this.getNumberOfDaysInMonth(year, month) / 7);
      let dayNumber = 1;
      // Number of rows to display
      let increment = 1;
      for (let x = 0; x <= numberOfRows; x++) {
        let decrement = 0;
        let row = [];
        let endOfMonth = false;
        // Fills the first row with previous month ending days
        if (x == 0) {
          for (let i = 0; i < firstDayOfMonth; i++) {
            if (parseInt(month) == 1)
              row.push({ day: this.getNumberOfDaysInPreviousMonth(year, month) - decrement, month: this.getPreviousMonth(month), year: parseInt(year) - 1});
            else 
              row.push({ day: this.getNumberOfDaysInPreviousMonth(year, month) - decrement, month: this.getPreviousMonth(month), year: parseInt(year)});
            decrement++;
          }
          row.reverse();
        }
        // Fills the rest of the rows
        for (let y = row.length; y < 7  && y < this.getNumberOfDaysInMonth(year, month); y++) {
          // While current month days are not excedeed
          if (dayNumber <= this.getNumberOfDaysInMonth(year, month)) {
            row.push({day: dayNumber, month: month, year: year});
            dayNumber++;
          } else {
            // Fills space left 
            for (let j = row.length; j < 7; j++) {
              if (parseInt(month) == 12) 
                row.push({day: increment, month: this.getNextMonth(month), year: parseInt(year) + 1});
              else
                row.push({day: increment, month: this.getNextMonth(month), year: year});
              increment++;
              let t = row;
            }
          } 
        }
        this.calendarDays.push(row);
      }
    },
    setPreviousMonth() {
      let activeYear = this.activeDate.substr(0, 4);
      let activeMonth = this.activeDate.substr(4, 2);
      if (parseInt(activeMonth) == 1) {
        activeYear = parseInt(activeYear) - 1;
        activeMonth = '12';
      } else {
        activeMonth = ('0' + (parseInt(activeMonth) - 1)).slice(-2);
      }
      this.activeDate = activeYear + activeMonth;
      this.populateCalendar(activeYear, activeMonth);
      this.animeSwipeRight()
    },
    setNextMonth() {
      let activeYear = this.activeDate.substr(0, 4);
      let activeMonth = this.activeDate.substr(4, 2);
      if (parseInt(activeMonth) == 12) {
        activeYear = parseInt(activeYear) + 1;
        activeMonth = '01';
      } else {
        activeMonth = ('0' + (parseInt(activeMonth) + 1)).slice(-2);
      }
      this.activeDate = activeYear + activeMonth;
      this.populateCalendar(activeYear, activeMonth);
      this.animeSwipeLeft()
    },
    selectDay(cell) {
      if (cell.month == this.getPreviousMonth(this.activeDate.substr(4, 2))) {
        this.setPreviousMonth();
      } else if (cell.month == this.getNextMonth(this.activeDate.substr(4, 2))) {
        this.setNextMonth();
      }
      this.activeDay = ("0" + cell.day).slice(-2) + cell.month + cell.year;
      this.date = ("0" + cell.day).slice(-2) + '/' + cell.month + '/' + cell.year; 
    },
    isSelected(cell) {
      if (("0" + cell.day).slice(-2) + cell.month + cell.year == this.activeDay)
        return true;
    },
    isDisabled(cell) {
      if (parseInt(cell.month) !== parseInt(this.activeDate.substr(4, 2)))
        return true;
    },
    animeSwipeLeft() {
      this.swipeLeft = true;
      setTimeout(() => {
        this.swipeLeft = false;
      }, 300)
    },
    animeSwipeRight() {
      this.swipeRight = true;
      setTimeout(() => {
        this.swipeRight = false;
      }, 300)
    }
  },
  mounted() {
    this.populateCalendar(2019, 1);
    this.activeDate = this.getCurrentYear() + this.getCurrentMonth();
  }
})

const vm = new Vue({
  el: "#app",
});
              
            
!
999px

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