带有过滤器的 HTML 选择字段

Question

我有一个选择字段，其中大量已发布的名称可能达到数百个。

我需要的是过滤字段，我的意思是：

如果选择并搜索了一个，则显示为表单的示例文本，并且可以编写新的搜索删除之前搜索的示例文本。

在框中键入文本时，栅栏将显示已过滤的文本选项列表。

一个例子是：如果我在文本框中输入 D 或 d，它会显示 Daniel Diego 的选项列表，所以对于所有的，如果您使用 Diego 进行搜索，那么在加载搜索文本框后会显示为示例 Diego .

<select id="id_name" name="name">
    <option value="3">Diego </option>
    <option value="4">Daniel  </option>
    <option value="5">Fernando  </option>
    <option value="6">Luz </option>
    <option value="7">Catherine  </option>
    <option value="8">Samuel  </option>
    <option value="10">Eduardo  </option>
</select>

Answer 1

试试这个。

Chosen 是一个用于<select> html 标签的 jQuery 插件。

它不仅让你的选择框看起来更漂亮，而且在选择框的顶部添加了一个非常棒的搜索功能。

源代码/演示在这里找到：http://harvesthq.github.com/chosen/

Answer 2

我猜这正是您要找的东西

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

function filterFunction() {
  var input, filter, ul, li, a, i;
  input = document.getElementById("myInput");
  filter = input.value.toUpperCase();
  div = document.getElementById("myDropdown");
  a = div.getElementsByTagName("a");
  for (i = 0; i < a.length; i++) {
    txtValue = a[i].textContent || a[i].innerText;
    if (txtValue.toUpperCase().indexOf(filter) > -1) {
      a[i].style.display = "";
    } else {
      a[i].style.display = "none";
    }
  }
}

/* Dropdown Button */
.dropbtn {
  background-color: #04AA6D;
  color: white;
  padding: 16px;
  font-size: 16px;
  border: none;
  cursor: pointer;
}

/* Dropdown button on hover & focus */
.dropbtn:hover, .dropbtn:focus {
  background-color: #3e8e41;
}

/* The search field */
#myInput {
  box-sizing: border-box;
  background-image: url('searchicon.png');
  background-position: 14px 12px;
  background-repeat: no-repeat;
  font-size: 16px;
  padding: 14px 20px 12px 45px;
  border: none;
  border-bottom: 1px solid #ddd;
}

/* The search field when it gets focus/clicked on */
#myInput:focus {outline: 3px solid #ddd;}

/* The container <div> - needed to position the dropdown content */
.dropdown {
  position: relative;
  display: inline-block;
}

/* Dropdown Content (Hidden by Default) */
.dropdown-content {
  display: none;
  position: absolute;
  background-color: #f6f6f6;
  min-width: 230px;
  border: 1px solid #ddd;
  z-index: 1;
}

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

/* Change color of dropdown links on hover */
.dropdown-content a:hover {background-color: #f1f1f1}

/* Show the dropdown menu (use JS to add this class to the .dropdown-content container when the user clicks on the dropdown button) */
.show {display:block;}

<div class="dropdown">
  <button onclick="myFunction()" class="dropbtn">Dropdown</button>
  <div id="myDropdown" class="dropdown-content">
    <input type="text" placeholder="Search.." id="myInput" onkeyup="filterFunction()">
    <a href="#about">About</a>
    <a href="#base">Base</a>
    <a href="#blog">Blog</a>
    <a href="#contact">Contact</a>
    <a href="#custom">Custom</a>
    <a href="#support">Support</a>
    <a href="#tools">Tools</a>
  </div>
</div>

Answer 3

如果你想使用 jQuery，那么这些是很好的 UI 选项：

https://select2.org/dropdown

https://jqueryui.com/selectmenu/

https://harvesthq.github.io/chosen/

---

如果你想使用 Vanilla JavaScript（没有 jQuery）。这是最好的选择。

您可以根据自己的选择自定义颜色和按钮布局。

More info

function myFunction() {
  document.getElementById("myDropdown").classList.toggle("show");
}

function filterFunction() {
  var input, filter, ul, li, a, i;
  input = document.getElementById("myInput");
  filter = input.value.toUpperCase();
  div = document.getElementById("myDropdown");
  a = div.getElementsByTagName("a");
  for (i = 0; i < a.length; i++) {
    txtValue = a[i].textContent || a[i].innerText;
    if (txtValue.toUpperCase().indexOf(filter) > -1) {
      a[i].style.display = "";
    } else {
      a[i].style.display = "none";
    }
  }
}

.dropbtn {
  background-color: #4CAF50;
  color: white;
  padding: 16px;
  font-size: 16px;
  border: none;
  cursor: pointer;
}

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

#myInput {
  box-sizing: border-box;
  background-image: url('searchicon.png');
  background-position: 14px 12px;
  background-repeat: no-repeat;
  font-size: 16px;
  padding: 14px 20px 12px 45px;
  border: none;
  border-bottom: 1px solid #ddd;
}

#myInput:focus {outline: 3px solid #ddd;}

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

.dropdown-content {
  display: none;
  position: absolute;
  background-color: #f6f6f6;
  min-width: 230px;
  overflow: auto;
  border: 1px solid #ddd;
  z-index: 1;
}

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

.dropdown a:hover {background-color: #ddd;}

.show {display: block;}

<!DOCTYPE html>
<h2>Basic Select Search/Filter Dropdown</h2>
<p>
Click to open the dropdown menu, and use the input field to search for a specific dropdown link.
</p>

<div class="dropdown">
  <button onclick="myFunction()" class="dropbtn">Select Here</button>
  <div id="myDropdown" class="dropdown-content">
    <input type="text" placeholder="Search.." id="myInput" onkeyup="filterFunction()">
    <a href="#about">About</a>
    <a href="#base">Base</a>
    <a href="#blog">Blog</a>
    <a href="#contact">Contact</a>
    <a href="#custom">Custom</a>
    <a href="#support">Support</a>
    <a href="#tools">Tools</a>
  </div>
</div>