Question

我想创建一个多选的保管箱列表。实际上我必须使用下拉菜单选择多个选项。当我这样做时，如下所示：

<select>
 <option><input type="checkbox"></option>
</select>

然后复选框显示在下拉字段前面。但我想为每个选项创建它而不是作为一个整体，以便我可以选择多个选项。有没有办法做到这一点？

Answer 1

这是一个简单的下拉列表

CSS

.dropdown-check-list {
  display: inline-block;
}
.dropdown-check-list .anchor {
  position: relative;
  cursor: pointer;
  display: inline-block;
  padding: 5px 50px 5px 10px;
  border: 1px solid #ccc;
}
.dropdown-check-list .anchor:after {
  position: absolute;
  content: "";
  border-left: 2px solid black;
  border-top: 2px solid black;
  padding: 5px;
  right: 10px;
  top: 20%;
  -moz-transform: rotate(-135deg);
  -ms-transform: rotate(-135deg);
  -o-transform: rotate(-135deg);
  -webkit-transform: rotate(-135deg);
  transform: rotate(-135deg);
}
.dropdown-check-list .anchor:active:after {
  right: 8px;
  top: 21%;
}
.dropdown-check-list ul.items {
  padding: 2px;
  display: none;
  margin: 0;
  border: 1px solid #ccc;
  border-top: none;
}
.dropdown-check-list ul.items li {
  list-style: none;
}
.dropdown-check-list.visible .anchor {
  color: #0094ff;
}
.dropdown-check-list.visible .items {
  display: block;
}

//标记和脚本

<body>

    <div id="list1" class="dropdown-check-list" tabindex="100">
        <span class="anchor">Select Fruits</span>
        <ul class="items">
            <li><input type="checkbox" />Apple </li>
            <li><input type="checkbox" />Orange</li>
            <li><input type="checkbox" />Grapes </li>
            <li><input type="checkbox" />Berry </li>
            <li><input type="checkbox" />Mango </li>
            <li><input type="checkbox" />Banana </li>
            <li><input type="checkbox" />Tomato</li>
        </ul>
    </div>

    <script type="text/javascript">

        var checkList = document.getElementById('list1');
        checkList.getElementsByClassName('anchor')[0].onclick = function (evt) {
            if (checkList.classList.contains('visible'))
                checkList.classList.remove('visible');
            else
                checkList.classList.add('visible');
        }

        checkList.onblur = function(evt) {
            checkList.classList.remove('visible');
        }
    </script>

</body>

Answer 2

这不能仅用HTML（将表单元素转换为option元素）来完成。有一个不错的jQuery小部件可以实现所需的效果，你可以找到here。

或者您可以使用标准select multiple字段。

<select multiple>
  <option value="a">a</option>
  <option value="b">b</option>
  <option value="c">c</option>
</select>

Answer 3

您可以随时将 multiple 或 multiple = "true" 选项与select标签一起使用，但有一个jquery插件可以让它更漂亮。它被称为选择，可以找到here。

This fiddle-example might help you to get started

谢谢。

Answer 4

带有复选框和jQuery的多个下拉菜单。

<div id="list3" class="dropdown-check-list" tabindex="100">
<span class="anchor">Which development(s) are you interested in?</span>
  <ul class="items">
      <li><input id="answers_2529_the-lawns" name="answers[2529][answers][]" type="checkbox" value="The Lawns"/><label for="answers_2529_the-lawns">The Lawns</label></li>
      <li><input id="answers_2529_the-residence" name="answers[2529][answers][]" type="checkbox" value="The Residence"/><label for="answers_2529_the-residence">The Residence</label></li>
  </ul>
</div>

<style>
.dropdown-check-list{
display: inline-block;
width: 100%;
}
.dropdown-check-list:focus{
outline:0;
}
.dropdown-check-list .anchor {
width: 98%;
position: relative;
cursor: pointer;
display: inline-block;
padding-top:5px;
padding-left:5px;
padding-bottom:5px;
border:1px #ccc solid;
}
.dropdown-check-list .anchor:after {
position: absolute;
content: "";
border-left: 2px solid black;
border-top: 2px solid black;
padding: 5px;
right: 10px;
top: 20%;
-moz-transform: rotate(-135deg);
-ms-transform: rotate(-135deg);
-o-transform: rotate(-135deg);
-webkit-transform: rotate(-135deg);
transform: rotate(-135deg);
}
.dropdown-check-list .anchor:active:after {
right: 8px;
top: 21%;
}
.dropdown-check-list ul.items {
padding: 2px;
display: none;
margin: 0;
border: 1px solid #ccc;
border-top: none;
}
.dropdown-check-list ul.items li {
list-style: none;
}
.dropdown-check-list.visible .anchor {
color: #0094ff;
}
.dropdown-check-list.visible .items {
display: block;
}
</style>

<script>
jQuery(function ($) {
        var checkList = $('.dropdown-check-list');
        checkList.on('click', 'span.anchor', function(event){
            var element = $(this).parent();

            if ( element.hasClass('visible') )
            {
                element.removeClass('visible');
            }
            else
            {
                element.addClass('visible');
            }
        });
    });
</script>

Answer 5

var expanded = false;

function showCheckboxes() {
  var checkboxes = document.getElementById("checkboxes");
  if (!expanded) {
    checkboxes.style.display = "block";
    expanded = true;
  } else {
    checkboxes.style.display = "none";
    expanded = false;
  }
}

.multiselect {
  width: 200px;
}

.selectBox {
  position: relative;
}

.selectBox select {
  width: 100%;
  font-weight: bold;
}

.overSelect {
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  bottom: 0;
}

#checkboxes {
  display: none;
  border: 1px #dadada solid;
}

#checkboxes label {
  display: block;
}

#checkboxes label:hover {
  background-color: #1e90ff;
}

<form>
  <div class="multiselect">
    <div class="selectBox" onclick="showCheckboxes()">
      <select>
        <option>Select an option</option>
      </select>
      <div class="overSelect"></div>
    </div>
    <div id="checkboxes">
      <label for="one">
        <input type="checkbox" id="one" />First checkbox</label>
      <label for="two">
        <input type="checkbox" id="two" />Second checkbox</label>
      <label for="three">
        <input type="checkbox" id="three" />Third checkbox</label>
    </div>
  </div>
</form>

Answer 6

使用Bootstrap和JQuery编写的非常简单的代码，没有任何其他javascript代码：

HTML：

<div class="dropdown">
  <button class="btn btn-secondary dropdown-toggle" type="button" id="dropdownMenuButton" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
    Dropdown button
  </button>
  <form class="dropdown-menu" aria-labelledby="dropdownMenuButton">
    <label class="dropdown-item"><input type="checkbox" name="" value="one">First checkbox</label>
    <label class="dropdown-item"><input type="checkbox" name="" value="two">Second checkbox</label>
    <label class="dropdown-item"><input type="checkbox" name="" value="three">Third checkbox</label>
  </form>
</div>

CSS：

.dropdown-menu label {
  display: block;
}

https://codepen.io/funkycram/pen/joVYBv

Answer 7

只需使用bootstrap-multiselect，即可在其中使用multiselect选项和更多功能填充下拉列表。

对于文档和教程，您可以访问下面的链接

https://www.npmjs.com/package/bootstrap-multiselect

http://davidstutz.de/bootstrap-multiselect/

如何在下拉列表中创建复选框？

7 个答案: