Kutengeneza: Kichwaaji cha menyu cha kuchagua

Mwongoza kuhusiana na kufanya kichwaaji cha kuchagua kwa CSS na JavaScript.

创建自定义选择菜单

第一步 - 添加 HTML：

<!-- 用 "custom-select" DIV 元素包围 select 框。记得设置宽度： -->
<div class="custom-select" style="width:200px;">
  <select>
    <option value="0">Select car:</option>
    <option value="1">Audi</option>
    <option value="2">BMW</option>
    <option value="3">Citroen</option>
    <option value="4">Ford</option>
    <option value="5">Honda</option>
    <option value="6">Jaguar</option>
    <option value="7">Land Rover</option>
    <option value="8">Mercedes</option>
    <option value="9">Mini</option>
    <option value="10">Nissan</option>
    <option value="11">Toyota</option>
    <option value="12">Volvo</option>
  </select>
</div>

第二步 - 添加 CSS：

/* 容器必须相对定位： */
.custom-select {
  position: relative;
  font-family: Arial;
}
.custom-select select {
  display: none; /* 隐藏原始 SELECT 元素： */
}
.select-selected {
  mabaki ya rangi: DodgerBlue;
}
/* 设置选择元素内箭头的样式： */
.select-selected:after {
  pewa: binafsi;
  content: "";
  top: 14px;
  right: 10px;
  kubadilika: 0;
  kubadilika: 0;
  mabaki: 6px solid transparent;
  mabaki ya rangi: #fff transparent transparent transparent;
}
/* Kama kifungu chukuliwa (kina) kina kuelekea juu: */
.select-selected.select-arrow-active:after {
  mabaki ya rangi: transparent transparent #fff transparent;
  kimoja: 7px;
}
/* Mifano ya majadiliano (mawili) ya mifano, ikiwemo mifano ya chaguo: */
.select-items div,.select-selected {
  mabaki ya rangi: #ffffff;
  kuchukua: 8px 16px;
  mabaki: 1px solid transparent;
  mabaki ya rangi: transparent transparent rgba(0, 0, 0, 0.1) transparent;
  kifunzi: pointer;
}
/* Mifano ya majadiliano (mawili) ya mifano: */
.select-items {
  pewa: binafsi;
  mabaki ya rangi: DodgerBlue;
  kimoja: 100%;
  kulia: 0;
  kushoto: 0;
  kazi: 99;
}
/* Hifadhi majadiliano kama kifungu chukuliwa: */
.select-hide {
  kutoka: none;
}
.select-items div:hover, .same-as-selected {
  mabaki ya rangi: rgba(0, 0, 0, 0.1);
}

Taratibu tatu - Ongeza JavaScript:

var x, i, j, l, ll, selElmnt, a, b, c;
/* Chukua elementi yenye kikoa "custom-select": */
x = document.getElementsByClassName("custom-select");
l = x.length;
for (i = 0; i < l; i++) {
  selElmnt = x[i].getElementsByTagName("select")[0];
  ll = selElmnt.length;
  /* Kwa kila element, naunda kipengele cha kipengele kinao kuingia kama item ya chaguo: */
  a = document.createElement("DIV");
  a.setAttribute("class", "select-selected");
  a.innerHTML = selElmnt.options[selElmnt.selectedIndex].innerHTML;
  x[i].appendChild(a);
  /* Kwa kila element, naunda kipengele cha kipengele kinao kuingia kama orodha ya chaguo: */
  b = document.createElement("DIV");
  b.setAttribute("class", "select-items select-hide");
  for (j = 1; j < ll; j++) {
    /* Kwa kila chaguo cha kichwa cha chaguo cha kwanza, naunda kipengele cha kipengele kinao kuingia kama item ya chaguo: */
    c = document.createElement("DIV");
    c.innerHTML = selElmnt.options[j].innerHTML;
    c.addEventListener("click", function(e) {
        /* Kwa kila item iliyotukia, naambia kikurahishe cha chaguo cha kwanza,
        na kwa item auo hili: */
        var y, i, k, s, h, sl, yl;
        s = this.parentNode.parentNode.getElementsByTagName("select")[0];
        sl = s.length;
        h = this.parentNode.previousSibling;
        for (i = 0; i < sl; i++) {
          if (s.options[i].innerHTML == this.innerHTML) {
            s.selectedIndex = i;
            h.innerHTML = this.innerHTML;
            y = this.parentNode.getElementsByClassName("same-as-selected");
            yl = y.length;
            for (k = 0; k < yl; k++) {
              y[k].removeAttribute("class");
            }
            this.setAttribute("class", "same-as-selected");
            break;
          }
        }
        h.click();
    });
    b.appendChild(c);
  }
  x[i].appendChild(b);
  a.addEventListener("click", function(e) {
    /* Ikiwe kama chaguo cha kikuu cha chaguo anafikia, inasema chaguo zingine na inafungua/kufunga chaguo hii: */
    e.stopPropagation();
    closeAllSelect(this);
    this.nextSibling.classList.toggle("select-hide");
    this.classList.toggle("select-arrow-active");
  });
}
function closeAllSelect(elmnt) {
  /* Inafikia kufunga chaguo zote cha chakula cha kitabu, chaguo cha hii inapunguza: */
  var x, y, i, xl, yl, arrNo = [];
  x = document.getElementsByClassName("select-items");
  y = document.getElementsByClassName("select-selected");
  xl = x.length;
  yl = y.length;
  for (i = 0; i < yl; i++) {
    if (elmnt == y[i]) {
      arrNo.push(i);
    }
      y[i].classList.remove("select-arrow-active");
    }
  }
  for (i = 0; i < xl; i++) {
    if (arrNo.indexOf(i)) {
      x[i].classList.add("select-hide");
    }
  }
}
/* Ikiwe kama mtu anafikia kikuu cha chaguo kwenye eneo lake laji, inasema chaguo zote: */
document.addEventListener("click", closeAllSelect);

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