单击和拖动日期选择器

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html

css

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html

<div class="calendar">

  <div class="day" data-day="1"><span class="number">1</span></div>
  <div class="day" data-day="2"><span class="number">2</span></div>
  <div class="day" data-day="3"><span class="number">3</span></div>
  <div class="day" data-day="4"><span class="number">4</span></div>
  <div class="day" data-day="5"><span class="number">5</span></div>
  <div class="day" data-day="6"><span class="number">6</span></div>
  <div class="day" data-day="7"><span class="number">7</span></div>
  <div class="day" data-day="8"><span class="number">8</span></div>
  <div class="day" data-day="9"><span class="number">9</span></div>
  <div class="day" data-day="10"><span class="number">10</span></div>
  <div class="day" data-day="11"><span class="number">11</span></div>
  <div class="day" data-day="12"><span class="number">12</span></div>
  <div class="day" data-day="13" data-selected="start"><span class="number" >13</span></div>
  <div class="day" data-day="14"><span class="number">14</span></div>
  <div class="day" data-day="15"><span class="number">15</span></div>
  <div class="day" data-day="16"><span class="number">16</span></div>
  <div class="day" data-day="17"><span class="number">17</span></div>
  <div class="day" data-day="18"><span class="number">18</span></div>
  <div class="day" data-day="19"><span class="number">19</span></div>
  <div class="day" data-day="20"><span class="number">20</span></div>
  <div class="day" data-day="21"><span class="number">21</span></div>
  <div class="day" data-day="22"><span class="number">22</span></div>
  <div class="day" data-day="23" data-selected="end"><span class="number" >23</span></div>
  <div class="day" data-day="24"><span class="number">24</span></div>
  <div class="day" data-day="25"><span class="number">25</span></div>
  <div class="day" data-day="26"><span class="number">26</span></div>
  <div class="day" data-day="27"><span class="number">27</span></div>
  <div class="day" data-day="28"><span class="number">28</span></div>
  <div class="day" data-day="29"><span class="number">29</span></div>
  <div class="day" data-day="30"><span class="number">30</span></div>
  <div class="day" data-day="31"><span class="number">31</span></div>
</div>

css

*,
*::before,
*::after {
  position: relative;
  box-sizing: border-box;
}

html {
  height: 100%;
  display: flex;
  background: #eee;
}

body {
  margin: auto;
}

:root {
  --color-primary: #00AEF2;
}

.calendar {
  font-size: 3vw;
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  grid-gap: 0.25em 0;
  margin: auto;
  padding: 1em;
  background: #FFF;
  box-shadow: 0 1em 2em rgba(0, 0, 0, 0.25);
  border-radius: .5em;
  -webkit-user-select: none;
     -moz-user-select: none;
      -ms-user-select: none;
          user-select: none;
}

.day:first-child {
  grid-column-start: 4;
}

.day {
  padding: 0.5em;
  text-align: center;
}
.day::before {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  margin: auto;
}
.day[data-selected]::before {
  border-radius: .5em;
}
.day[data-selected="start"]::before {
  border-top-right-radius: 0;
  border-bottom-right-radius: 0;
}
.day[data-selected], .day[data-selected] ~ .day {
  color: white;
}
.day[data-selected]::before, .day[data-selected] ~ .day::before {
  background-color: var(--color-primary);
}
.day[data-selected="start"] ~ .day:not([data-selected="end"])::before {
  opacity: 0.5;
}
.day[data-selected="end"][data-selected="end"]::before {
  border-top-left-radius: 0;
  border-bottom-left-radius: 0;
}
.day[data-selected="end"] ~ .day {
  color: inherit;
}
.day[data-selected="end"] ~ .day::before {
  background-color: transparent;
}

JavaScript

console.clear();

// idle
// -> onPointerDown
// dragging
// -> onPointerMove / onPointerOver
// <- onPointerUp

/*注意：我们根据第一选择和第二选择对数据进行了重新处理。稍后，我们将在"updateDOM"函数中计算哪个是开始日期和结束日期。*/
const data = {
  firstDate: null,
  secondDate: null
};

// idle
let currentState = machine.initial;

function send(event) {
  const transition = machine
    .states[currentState]
    .on[event.type];

if (typeof transition === 'function') {
    currentState = transition(data, event);
    updateDOM();
  } else if (transition) {
    currentState = transition;
    updateDOM();
  }
}

/* ---------------------------------- */

const allDayEls = document.querySelectorAll('[data-day]');

allDayEls.forEach(dayEl => {
  dayEl.addEventListener('pointerdown', send);
  dayEl.addEventListener('pointerover', send);
});

document.body.addEventListener('pointerup', send);

/* ---------------------------------- */

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