有没有办法在HTML5 datalist选项上应用CSS样式？

Question

我想修改显示我的datalist的不同选项列表的方式.是否可以在其上应用一些CSS属性？

<input list="languages" id="language_id">
<datalist id="languages">
      <option value="html">HTML</option>
      <option value="java">Java</option>
      <option value="perl">Perl</option>
      <option value="php">PHP</option>
      <option value="ruby-on-rails">Ruby on Rails</option>
</datalist>

我试过了

option {
    background: red;
}

但它似乎没有用.

Answer 1

与select元素一样,datalist元素在样式上几乎没有灵活性.如果这是您的问题,那么您无法设置任何建议的术语.

浏览器为这些元素定义自己的样式.

Answer 2

我在有人这样做的地方找到了这个codepen：https://codepen.io/sidd_dev/pen/qBRWNQQ ?editors=1010

我用它测试了

• Chrome 108.0.5359.99（官方版本）（64 位）
• 火狐浏览器 107.0.1（64 位

您应该检查https://caniuse.com/?search=datalist了解有关浏览器支持的更多详细信息。

input.onfocus = function () {
  browsers.style.display = 'block';
  input.style.borderRadius = "5px 5px 0 0";  
};
for (let option of browsers.options) {
  option.onclick = function () {
    input.value = option.value;
    browsers.style.display = 'none';
    input.style.borderRadius = "5px";
  }
};

input.oninput = function() {
  currentFocus = -1;
  var text = input.value.toUpperCase();
  for (let option of browsers.options) {
    if(option.value.toUpperCase().indexOf(text) > -1){
      option.style.display = "block";
  }else{
    option.style.display = "none";
    }
  };
}
var currentFocus = -1;
input.onkeydown = function(e) {
  if(e.keyCode == 40){
    currentFocus++
   addActive(browsers.options);
  }
  else if(e.keyCode == 38){
    currentFocus--
   addActive(browsers.options);
  }
  else if(e.keyCode == 13){
    e.preventDefault();
        if (currentFocus > -1) {
          /*and simulate a click on the "active" item:*/
          if (browsers.options) browsers.options[currentFocus].click();
        }
  }
}

function addActive(x) {
    if (!x) return false;
    removeActive(x);
    if (currentFocus >= x.length) currentFocus = 0;
    if (currentFocus < 0) currentFocus = (x.length - 1);
    x[currentFocus].classList.add("active");
  }
  function removeActive(x) {
    for (var i = 0; i < x.length; i++) {
      x[i].classList.remove("active");
    }
  }

fieldset {
  border: 1px solid blue;
  width: 360px;
  border-radius: 5px;
}

legend, label{
  color: blue; 
  font-size: 24px;
  font-family: sans-serif;
}

input {
  font-size: 18px;
  padding: 5px;
  height: 35px;
  width: 350px;
  border: 1px solid blue;
  outline: none;
  border-radius: 5px;
  color: blue;
/*   border-bottom: none; */
}
datalist {
  position: absolute;
  background-color: white;
  border: 1px solid blue;
  border-radius: 0 0 5px 5px;
  border-top: none;
  font-family: sans-serif;
  width: 350px;
  padding: 5px;
  max-height: 10rem;
  overflow-y: auto
  
}

option {
  background-color: white;
  padding: 4px;
  color: blue;
  margin-bottom: 1px;
   font-size: 18px;
  cursor: pointer;
}

option:hover,  .active{
  background-color: lightblue;
}

  <fieldset>
    <legend>
      Datalist Form
    </legend>
    <label>Select Browser</label>
    <input  autocomplete="off" role="combobox" list="" id="input" name="browsers" placeholder="Select your fav browser">
  <!-- Its important that you keep list attribute empty to hide the default dropdown icon and the browser's default datalist -->

  <datalist id="browsers" role="listbox">
    <option value="Internet Explorer">Internet Explorer</option>
  <option value="Chrome">Chrome</option>
  <option value="Safari">Safari</option>
    <option value="Microsoft Edge">Microsoft Edge</option>
    <option value="Firefox">Firefox</option><option value="Microsoft Edge">Microsoft Edge</option>
    <option value="Firefox">Firefox</option><option value="Microsoft Edge">Microsoft Edge</option>
    <option value="Firefox">Firefox</option><option value="Microsoft Edge">Microsoft Edge</option>
    <option value="Firefox">Firefox</option><option value="Microsoft Edge">Microsoft Edge</option>
    <option value="Firefox">Firefox</option><option value="Microsoft Edge">Microsoft Edge</option>
    <option value="Firefox">Firefox</option><option value="Microsoft Edge">Microsoft Edge</option>
    <option value="Firefox">Firefox</option><option value="Microsoft Edge">Microsoft Edge</option>
    <option value="Firefox">Firefox</option><option value="Microsoft Edge">Microsoft Edge</option>
    <option value="Firefox">Firefox</option><option value="Microsoft Edge">Microsoft Edge</option>
    <option value="Firefox">Firefox</option>
  </datalist>
<!--     <br>
    <br>
    <label for="pwd"> Password </label>
    <input id="pwd" type="password">
     -->
  </fieldset>