Question

我不知道为什么，但是由于某种原因，即使我使用最简单的示例（常规HTML或引导程序），选项列表也位于select控件本身之上。不知道为什么。帮助别人吗？

我的代码如下

<form>
  <div class="form-group">
     <select class="custom-select" id="sel1">
        #foreach( $state in $stateList )
        <option value="$state">$state</option>
        #end
     </select>
  </div>
</form>



<select class="custom-select">
    <option value="volvo">Volvo</option>
    <option value="saab">Saab</option>
    <option value="vw">VW</option>
    <option value="audi" selected>Audi</option>
</select>

两个示例都给出了相同的视觉问题

enter image description here

Answer 1

这看起来很多。但是，这是您的代码的示例（虽然只有一个选择）。像您的示例一样，它并不是W3c的引导解决方案。

您可以尝试以下方法：

var x, i, j, selElmnt, a, b, c;
/* Look for any elements with the class "custom-select": */
x = document.getElementsByClassName("test-select");
for (i = 0; i < x.length; i++) {
  selElmnt = x[i].getElementsByTagName("select")[0];
  /* For each element, create a new DIV that will act as the selected item: */
  a = document.createElement("DIV");
  a.setAttribute("class", "select-selected");
  a.innerHTML = selElmnt.options[selElmnt.selectedIndex].innerHTML;
  x[i].appendChild(a);
  /* For each element, create a new DIV that will contain the option list: */
  b = document.createElement("DIV");
  b.setAttribute("class", "select-items select-hide");
  for (j = 1; j < selElmnt.length; j++) {
    /* For each option in the original select element,
    create a new DIV that will act as an option item: */
    c = document.createElement("DIV");
    c.innerHTML = selElmnt.options[j].innerHTML;
    c.addEventListener("click", function(e) {
        /* When an item is clicked, update the original select box,
        and the selected item: */
        var y, i, k, s, h;
        s = this.parentNode.parentNode.getElementsByTagName("select")[0];
        h = this.parentNode.previousSibling;
        for (i = 0; i < s.length; i++) {
          if (s.options[i].innerHTML == this.innerHTML) {
            s.selectedIndex = i;
            h.innerHTML = this.innerHTML;
            y = this.parentNode.getElementsByClassName("same-as-selected");
            for (k = 0; k < y.length; 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) {
    /* When the select box is clicked, close any other select boxes,
    and open/close the current select box: */
    e.stopPropagation();
    closeAllSelect(this);
    this.nextSibling.classList.toggle("select-hide");
    this.classList.toggle("select-arrow-active");
  });
}

function closeAllSelect(elmnt) {
  /* A function that will close all select boxes in the document,
  except the current select box: */
  var x, y, i, arrNo = [];
  x = document.getElementsByClassName("select-items");
  y = document.getElementsByClassName("select-selected");
  for (i = 0; i < y.length; i++) {
    if (elmnt == y[i]) {
      arrNo.push(i)
    } else {
      y[i].classList.remove("select-arrow-active");
    }
  }
  for (i = 0; i < x.length; i++) {
    if (arrNo.indexOf(i)) {
      x[i].classList.add("select-hide");
    }
  }
}

/* If the user clicks anywhere outside the select box,
then close all select boxes: */
document.addEventListener("click", closeAllSelect);

/* The container must be positioned relative: */
.test-select {
  position: relative;
  font-family: Arial;
}

.test-select select {
  display: none; /*hide original SELECT element: */
}

.select-selected {
  background-color: DodgerBlue;
}

/* Style the arrow inside the select element: */
.select-selected:after {
  position: absolute;
  content: "";
  top: 14px;
  right: 10px;
  width: 0;
  height: 0;
  border: 6px solid transparent;
  border-color: #fff transparent transparent transparent;
}

/* Point the arrow upwards when the select box is open (active): */
.select-selected.select-arrow-active:after {
  border-color: transparent transparent #fff transparent;
  top: 7px;
}

/* style the items (options), including the selected item: */
.select-items div,.select-selected {
  color: #ffffff;
  padding: 8px 16px;
  border: 1px solid transparent;
  border-color: transparent transparent rgba(0, 0, 0, 0.1) transparent;
  cursor: pointer;
}

/* Style items (options): */
.select-items {
  position: absolute;
  background-color: DodgerBlue;
  top: 100%;
  left: 0;
  right: 0;
  z-index: 99;
}

/* Hide the items when the select box is closed: */
.select-hide {
  display: none;
}

.select-items div:hover, .same-as-selected {
  background-color: rgba(0, 0, 0, 0.1);
}

<form>
  <div class="form-group">
    <div class="test-select">
      <select class="custom-select">
        <option value="0">Select car:</option>
        <option value="volvo">Volvo</option>
        <option value="saab">Saab</option>
        <option value="vw">VW</option>
        <option value="audi">Audi</option>
      </select>
    </div>
  </div>
</form>

选择列表选项位于控制之上

1 个答案: