如何创建：树视图

学习如何使用 CSS 和 JavaScript 创建树视图。

树视图

第一步 - 添加 HTML：

<ul id="myUL">
  <li><span class="caret">Beverages</span>
    <ul class="nested">
      <li>Water</li>
      <li>Coffee</li>
      <li><span class="caret">Tea</span>
        <ul class="nested">
          <li>Black Tea</li>
          <li>White Tea</li>
          <li><span class="caret">Green Tea</span>
            <ul class="nested">
              <li>Sencha</li>
              <li>Gyokuro</li>
              <li>Matcha</li>
              <li>Pi Lo Chun</li>
            </ul>
          </li>
        </ul>
      </li>
    </ul>
  </li>
</ul>

Tathmini ya pili - Ongeza CSS:

/* Kupunguza ujumbe wa yaani kwa orodha kwa kawaida */
ul, #myUL {
  list-style-type: none;
}
/* Kupunguza kimaumaa na kimaeneo ya ulinganisho wa kina cha kina cha maelezo */
#myUL {
  margin: 0;
  padding: 0;
}
/* Kustahili stili za caret/nyota */
.caret {
  cursor: pointer;
  user-select: none; /* Kupunguza upeleziwa wa matukio */
}
/* Tumia unicode kubuni caret/nyota, na kustahili stili zake */
.caret::before {
  content: "\25B6";
  color: black;
  display: inline-block;
  margin-right: 6px;
}
/* Kama mtu anafikia ikona caret/nyota, tukiozea ita (kwa JavaScript) */
.caret-down::before {
  transform: rotate(90deg);
}
/* Onyesha orodha yenye */
.nested {
  taarifu: none;
}
/* Kama mtu anafikia caret/nyota, onyesha orodha yenye (kwa JavaScript) */
.active {
  taarifu: block;
}

Tathmini ya tatu - Ongeza JavaScript:

var toggler = document.getElementsByClassName("caret");
var i;
for (i = 0; i < toggler.length; i++) {
  toggler[i].addEventListener("click", function() {
    this.parentElement.querySelector(".nested").classList.toggle("active");
    this.classList.toggle("caret-down");
  });
}

Tukijifanya kwa urahisi

Chagua cha kikuu cha kizazi

Kwenye mifano hii, tunatumia 'kikaburi cha kura' kina unicode kina 'kikuria':

Mifano

Tukijifanya kwa urahisi