如何使用javascript显示数据列表? [英] How to show datalist with javascript?

问题描述

嘿，我想在单击按钮时显示特定输入的数据列表，但找不到方法.

Hey I want to show datalist of specific input on click of button but I cannot find how to.

HTML

<input type="text" name="" value="" list="list" id='input'>
<datalist id='list'>
  <option value="aaa">
  <option value="bb">
</datalist>
<div onclick="showDataList(event,'input')">
  Click
</div>

JS

function showDataList(e,id) {
  document.getElementById(id).list.show()
}

我尝试过两次focus()，focus()和click()，并检查哪个事件数据列表show函数会触发但无济于事.

I have tried double focus(), focus() and click() and checking on which event datalist show function fires but to no avail.

推荐答案

要使用有效的下拉菜单，可以使用诸如material-ui/semantic-ui之类的第三方库更加简单.
但是，如果您想要干净的解决方案，则此默认方法可能会很有用.

To have working dropdown menu it's just simpler to use 3rd party libs such as material-ui/semantic-ui.
But if you want clean solution, this default approach might be useful.

/* 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');
      }
    }
  }
}

.dropbtn {
  background-color: #3498DB;
  color: white;
  padding: 16px;
  font-size: 16px;
  border: none;
  cursor: pointer;
}

.dropbtn:hover, .dropbtn:focus {
  background-color: #2980B9;
}

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

.dropdown-content {
  display: none;
  position: absolute;
  background-color: #f1f1f1;
  min-width: 160px;
  overflow: auto;
  box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
  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;}

<div class="dropdown">
  <button onclick="myFunction()" class="dropbtn">Dropdown</button>
  <div id="myDropdown" class="dropdown-content">
    <a href="#aaa">aaa</a>
    <a href="#bb">bb</a>
  </div>
</div>

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