我有一个HTML格式的文本区域。当用户开始输入内容时,我想根据预填充列表(JSON)自动填充可能的匹配项列表。最后,用户可以only从这些选项之一中进行选择。如果没有超过一千种选择,那么使用下拉菜单是可行的。关于如何实现这一点的任何想法?还是从哪里开始?谢谢!
[W3Schools中查看此示例。
我已经对其进行了修改,以从JS-Array创建Dropdown。我希望这是一个很好的起点。
var list = [{name: "Foo", link: "#foo"}, {name: "Bar", link: "#bar"}]
function myFunction() {
var dopdownEl = document.getElementById("myDropdown");
dopdownEl.classList.toggle("show");
list.forEach(o => {
var el = document.createElement('a');
el.innerHTML = o.name;
el.href = o.link;
dopdownEl.appendChild(el);
});
}
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";
}
}
}
#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;}
<div>
<button onclick="myFunction()">Dropdown</button>
<div id="myDropdown" class="dropdown-content">
<input type="text" placeholder="Search.." id="myInput" onkeyup="filterFunction()">
</div>
</div>