Javascript-使用不同的值和选项创建dropdownlist_Javascript

Javascript-使用不同的值和选项创建dropdownlist

javascript

Javascript-使用不同的值和选项创建dropdownlist,javascript,Javascript,我需要创建一个下拉列表，如下所示： <option value="http://multirbl.valli.org/lookup/img.snd1.ch.html">img.snd1.ch</option> <option value="http://multirbl.valli.org/lookup/img.snd15.ch.html">img.snd15.ch</option> <option value="http://multirb

我需要创建一个下拉列表，如下所示：

<option value="http://multirbl.valli.org/lookup/img.snd1.ch.html">img.snd1.ch</option>
<option value="http://multirbl.valli.org/lookup/img.snd15.ch.html">img.snd15.ch</option>
<option value="http://multirbl.valli.org/lookup/img.snd17.ch.html">img.snd17.ch</option>
<option value="http://multirbl.valli.org/lookup/img.snd2.ch.html">img.snd2.ch</option>
<option value="http://multirbl.valli.org/lookup/img.snd34.ch.html">img.snd34.ch</option>
<option value="http://multirbl.valli.org/lookup/img.snd35.ch.html">img.snd35.ch</option>
<option value="http://multirbl.valli.org/lookup/img.snd36.ch.html">img.snd36.ch</option>
<option value="http://multirbl.valli.org/lookup/img.snd37.ch.html">img.snd37.ch</option>
<option value="http://multirbl.valli.org/lookup/img.snd38.ch.html">img.snd38.ch</option>
<option value="http://multirbl.valli.org/lookup/img.snd39.ch.html">img.snd39.ch</option>
<option value="http://multirbl.valli.org/lookup/img.snd40.ch.html">img.snd40.ch</option>
<option value="http://multirbl.valli.org/lookup/img.snd41.ch.html">img.snd41.ch</option>
<option value="http://multirbl.valli.org/lookup/img.snd42.ch.html">img.snd42.ch</option>
<option value="http://multirbl.valli.org/lookup/img.snd43.ch.html">img.snd43.ch</option>
<option value="http://multirbl.valli.org/lookup/img.snd44.ch.html">img.snd44.ch</option>
<option value="http://multirbl.valli.org/lookup/img.snd45.ch.html">img.snd45.ch</option>
<option value="http://multirbl.valli.org/lookup/img.snd46.ch.html">img.snd46.ch</option>
<option value="http://multirbl.valli.org/lookup/img.snd47.ch.html">img.snd47.ch</option>

img.snd1.ch
img.snd15.ch
img.snd17.ch
img.snd2.ch
img.snd34.ch
img.snd35.ch
img.snd36.ch
img.snd37.ch
img.snd38.ch
img.snd39.ch
img.snd40.ch
img.snd41.ch
img.snd42.ch
img.snd43.ch
img.snd44.ch
img.snd45.ch
img.snd46.ch
img.snd47.ch

我想用Javascript来实现这一点，但我怎么能做到呢

你们能帮帮我吗？非常感谢

试试jQuery

JS:

var选项=”；
对于（变量i=1；i<48；i++）{
选项+='img.snd'+i+'.ch'
}
$（'select'）.html（选项）；

HTML:

或者如果索引是预定义的

JS:

var选项=”；
var指数=[1,15,17,2,34,35,36,37,38,39,40,41,42,43,44,45,46,47]
对于（var i=0；i

这里是一个纯javascript解决方案

var-select=document.querySelector（'select'）；
如果（选择）{
var skip_数=[3,4,5]；
var计数=45；
对于（变量i=0；i


请找到以下代码，通过javascript和css创建下拉列表
您可以添加您的样式
<!DOCTYPE html>
<html>
<head>
<style>
.dropbtn {
    background-color: #4CAF50;
    color: white;
    padding: 16px;
    font-size: 16px;
    border: none;
    cursor: pointer;
}

.dropbtn:hover, .dropbtn:focus {
    background-color: #3e8e41;
}

.dropdown {
    position: relative;
    display: inline-block;
}

.dropdown-content {
    display: none;
    position: absolute;
    background-color: #f9f9f9;
    min-width: 160px;
    overflow: auto;
    box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
}

.dropdown-content a {
    color: black;
    padding: 12px 16px;
    text-decoration: none;
    display: block;
}

.dropdown a:hover {background-color: #f1f1f1}

.show {display:block;}
</style>
</head>
<body>

<h2>Clickable Dropdown</h2>
<p>Click on the button to open the dropdown menu.</p>

<div class="dropdown">
<button onclick="myFunction()" class="dropbtn">Dropdown</button>
<div id="myDropdown" class="dropdown-content">
<a href="http://multirbl.valli.org/lookup/img.snd1.ch.html">img.snd1.ch</a>
<a href="http://multirbl.valli.org/lookup/img.snd15.ch.html">img.snd15.ch</a>
<a href="http://multirbl.valli.org/lookup/img.snd17.ch.html">img.snd17.ch</a>
<a href="http://multirbl.valli.org/lookup/img.snd2.ch.html">img.snd2.ch</a>
<a href="http://multirbl.valli.org/lookup/img.snd34.ch.html">img.snd34.ch</a>
<a href="http://multirbl.valli.org/lookup/img.snd35.ch.html">img.snd35.ch</a>
<a href="http://multirbl.valli.org/lookup/img.snd36.ch.html">img.snd36.ch</a>
<a href="http://multirbl.valli.org/lookup/img.snd37.ch.html">img.snd37.ch</a>
<a href="http://multirbl.valli.org/lookup/img.snd38.ch.html">img.snd38.ch</a>
<a href="http://multirbl.valli.org/lookup/img.snd39.ch.html">img.snd39.ch</a>
<a href="http://multirbl.valli.org/lookup/img.snd40.ch.html">img.snd40.ch</a>
<a href="http://multirbl.valli.org/lookup/img.snd41.ch.html">img.snd41.ch</a>
<a href="http://multirbl.valli.org/lookup/img.snd42.ch.html">img.snd42.ch</a>
<a href="http://multirbl.valli.org/lookup/img.snd43.ch.html">img.snd43.ch</a>
<a href="http://multirbl.valli.org/lookup/img.snd44.ch.html">img.snd44.ch</a>
<a href="http://multirbl.valli.org/lookup/img.snd45.ch.html">img.snd45.ch</a>
<a href="http://multirbl.valli.org/lookup/img.snd46.ch.html">img.snd46.ch</a>
<a href="http://multirbl.valli.org/lookup/img.snd47.ch.html">img.snd47.ch</a>

</div>
</div>

<script>
/* When the user clicks on the button,
toggle between hiding and showing the dropdown content */
function myFunction() {
    document.getElementById("myDropdown").classList.toggle("show");
}

// Close the dropdown if the user clicks outside of it
window.onclick = function(event) {
  if (!event.target.matches('.dropbtn')) {

    var dropdowns = document.getElementsByClassName("dropdown-content");
    var i;
    for (i = 0; i < dropdowns.length; i++) {
      var openDropdown = dropdowns[i];
      if (openDropdown.classList.contains('show')) {
        openDropdown.classList.remove('show');
      }
    }
  }
}
</script>

</body>
</html>


.dropbtn{
背景色：#4CAF50；
颜色：白色；
填充：16px；
字体大小：16px；
边界：无；
光标：指针；
}
.dropbtn:悬停，.dropbtn:焦点{
背景色：#3e8e41；
}
.下拉列表{
位置：相对位置；
显示：内联块；
}
.下拉内容{
显示：无；
位置：绝对位置；
背景色：#f9f9f9；
最小宽度：160px；
溢出：自动；
盒影：0px 8px 16px 0px rgba（0,0,0,0.2）；
}
.下拉内容a{
颜色：黑色；
填充：12px 16px；
文字装饰：无；
显示：块；
}
.下拉列表a:悬停{背景色：#f1f1}
.show{display:block；}
可点击下拉列表
单击按钮打开下拉菜单
下拉列表
/*当用户单击按钮时，
在隐藏和显示下拉内容之间切换*/
函数myFunction（）{
document.getElementById（“myDropdown”）.classList.toggle（“show”）；
}
//如果用户在下拉列表之外单击，请关闭下拉列表
window.onclick=函数（事件）{
如果（！event.target.matches（'.dropbtn'））{
var dropdowns=document.getElementsByClassName（“下拉内容”）；
var i；
对于（i=0；i

<select></select>

var options = '';

var indexes = [1, 15, 17, 2, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47]

for (var i = 0; i < indexes.length; i++) {
    options += '<option value="http://multirbl.valli.org/lookup/img.snd' + indexes[i] + '.ch.html">img.snd' + indexes[i] + '.ch</option>'
}

$('select').html(options);

<!DOCTYPE html>
<html>
<head>
<style>
.dropbtn {
    background-color: #4CAF50;
    color: white;
    padding: 16px;
    font-size: 16px;
    border: none;
    cursor: pointer;
}

.dropbtn:hover, .dropbtn:focus {
    background-color: #3e8e41;
}

.dropdown {
    position: relative;
    display: inline-block;
}

.dropdown-content {
    display: none;
    position: absolute;
    background-color: #f9f9f9;
    min-width: 160px;
    overflow: auto;
    box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
}

.dropdown-content a {
    color: black;
    padding: 12px 16px;
    text-decoration: none;
    display: block;
}

.dropdown a:hover {background-color: #f1f1f1}

.show {display:block;}
</style>
</head>
<body>

<h2>Clickable Dropdown</h2>
<p>Click on the button to open the dropdown menu.</p>

<div class="dropdown">
<button onclick="myFunction()" class="dropbtn">Dropdown</button>
<div id="myDropdown" class="dropdown-content">
<a href="http://multirbl.valli.org/lookup/img.snd1.ch.html">img.snd1.ch</a>
<a href="http://multirbl.valli.org/lookup/img.snd15.ch.html">img.snd15.ch</a>
<a href="http://multirbl.valli.org/lookup/img.snd17.ch.html">img.snd17.ch</a>
<a href="http://multirbl.valli.org/lookup/img.snd2.ch.html">img.snd2.ch</a>
<a href="http://multirbl.valli.org/lookup/img.snd34.ch.html">img.snd34.ch</a>
<a href="http://multirbl.valli.org/lookup/img.snd35.ch.html">img.snd35.ch</a>
<a href="http://multirbl.valli.org/lookup/img.snd36.ch.html">img.snd36.ch</a>
<a href="http://multirbl.valli.org/lookup/img.snd37.ch.html">img.snd37.ch</a>
<a href="http://multirbl.valli.org/lookup/img.snd38.ch.html">img.snd38.ch</a>
<a href="http://multirbl.valli.org/lookup/img.snd39.ch.html">img.snd39.ch</a>
<a href="http://multirbl.valli.org/lookup/img.snd40.ch.html">img.snd40.ch</a>
<a href="http://multirbl.valli.org/lookup/img.snd41.ch.html">img.snd41.ch</a>
<a href="http://multirbl.valli.org/lookup/img.snd42.ch.html">img.snd42.ch</a>
<a href="http://multirbl.valli.org/lookup/img.snd43.ch.html">img.snd43.ch</a>
<a href="http://multirbl.valli.org/lookup/img.snd44.ch.html">img.snd44.ch</a>
<a href="http://multirbl.valli.org/lookup/img.snd45.ch.html">img.snd45.ch</a>
<a href="http://multirbl.valli.org/lookup/img.snd46.ch.html">img.snd46.ch</a>
<a href="http://multirbl.valli.org/lookup/img.snd47.ch.html">img.snd47.ch</a>

</div>
</div>

<script>
/* When the user clicks on the button,
toggle between hiding and showing the dropdown content */
function myFunction() {
    document.getElementById("myDropdown").classList.toggle("show");
}

// Close the dropdown if the user clicks outside of it
window.onclick = function(event) {
  if (!event.target.matches('.dropbtn')) {

    var dropdowns = document.getElementsByClassName("dropdown-content");
    var i;
    for (i = 0; i < dropdowns.length; i++) {
      var openDropdown = dropdowns[i];
      if (openDropdown.classList.contains('show')) {
        openDropdown.classList.remove('show');
      }
    }
  }
}
</script>

</body>
</html>