Question

function myFunction() {
    var input, filter, ul, li, a, i;
    input = document.getElementById("myInput");
    filter = input.value.toUpperCase();
    ul = document.getElementById("myUL");
    li = ul.getElementsByTagName("li");

    for (i = 0; i < li.length; i++) {
        a = li[i].getElementsByTagName("a")[0];
        if (a.innerHTML.toUpperCase().indexOf(filter) > -1) {
            li[i].style.display = "";
        } else {
            li[i].style.display = "none";

        }
    }
}

* {
  box-sizing: border-box;
}

#myInput {
  background-image: url('/css/searchicon.png');
  background-position: 10px 12px;
  background-repeat: no-repeat;
  width: 100%;
  font-size: 16px;
  padding: 12px 20px 12px 40px;
  border: 1px solid #ddd;
  margin-bottom: 12px;
}

#myUL {
  list-style-type: none;
  padding: 0;
  margin: 0;
}

#myUL li a {
  border: 1px solid #ddd;
  margin-top: -1px; /* Prevent double borders */
  background-color: #f6f6f6;
  padding: 12px;
  text-decoration: none;
  font-size: 18px;
  color: black;
  display: block
}

#myUL li a:hover:not(.header) {
  background-color: #eee;
}

<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1">
</head>
<body>

<h2>Branch Email</h2>

<input type="text" id="myInput" onkeyup="myFunction()" placeholder="Enter your branch code..." title="Type in a name">

<ul id="myUL">
  <li><a href="#">Adele</a></li>
  <li><a href="#">Agnes</a></li>

  <li><a href="#">Billy</a></li>
  <li><a href="#">Bob</a></li>

  <li><a href="#">Calvin</a></li>
  <li><a href="#">Christina</a></li>
  <li><a href="#">Cindy</a></li>
</ul>



</body>
</html>

如何修改我的代码，以便在用户搜索某些内容之前不显示列表项？

Answer 1

隐藏所有li个。默认情况下

#myUL li{
  display:none;
}

在input的按键上，将其显示更改为block而不是""

if (a.innerHTML.toUpperCase().indexOf(filter) > -1) {
  li[i].style.display = "block";
} else {
  li[i].style.display = "none";
}

function myFunction() {
  var input, filter, ul, li, a, i;
  input = document.getElementById("myInput");
  filter = input.value.toUpperCase();
  ul = document.getElementById("myUL");
  li = ul.getElementsByTagName("li");

  for (i = 0; i < li.length; i++) {

    a = li[i].getElementsByTagName("a")[0];
    if (filter!== "" && a.innerHTML.toUpperCase().indexOf(filter) > -1) {
      li[i].style.display = "block";
    } else {
      li[i].style.display = "none";
    }
  }
}

* {
  box-sizing: border-box;
}

#myInput {
  background-image: url('/css/searchicon.png');
  background-position: 10px 12px;
  background-repeat: no-repeat;
  width: 100%;
  font-size: 16px;
  padding: 12px 20px 12px 40px;
  border: 1px solid #ddd;
  margin-bottom: 12px;
}

#myUL {
  list-style-type: none;
  padding: 0;
  margin: 0;
}

#myUL li a {
  border: 1px solid #ddd;
  margin-top: -1px;
  /* Prevent double borders */
  background-color: #f6f6f6;
  padding: 12px;
  text-decoration: none;
  font-size: 18px;
  color: black;
  display: block
}

#myUL li {
  display: none;
}

#myUL li a:hover:not(.header) {
  background-color: #eee;
}

<!DOCTYPE html>
<html>

<head>
  <meta name="viewport" content="width=device-width, initial-scale=1">
</head>

<body>

  <h2>Branch Email</h2>

  <input type="text" id="myInput" onkeyup="myFunction()" placeholder="Enter your branch code..." title="Type in a name">

  <ul id="myUL">
    <li><a href="#">Adele</a></li>
    <li><a href="#">Agnes</a></li>

    <li><a href="#">Billy</a></li>
    <li><a href="#">Bob</a></li>

    <li><a href="#">Calvin</a></li>
    <li><a href="#">Christina</a></li>
    <li><a href="#">Cindy</a></li>
  </ul>



</body>

</html>

<强>更新

将if条件更新为

filter!== "" && a.innerHTML.toUpperCase().indexOf(filter) > -1

处理退格时的情况并清空输入值。

Answer 2

您需要设置要隐藏的初始显示项，然后让if语句不仅检查它是否包含您要查找的字符串，还要检查过滤器是否为空字符串。

function myFunction() {
    var input, filter, ul, li, a, i;
    input = document.getElementById("myInput");
    filter = input.value.toLowerCase();
    ul = document.getElementById("myUL");
    li = ul.getElementsByTagName("li");

    for (i = 0; i < li.length; i++) {
        a = li[i].getElementsByTagName("a")[0];
        if (a.innerHTML.toLowerCase().includes(filter) && filter !== "") {
            li[i].style.display = "block";
        } else {
            li[i].style.display = "none";
        }
    }
}

* {
  box-sizing: border-box;
}

#myInput {
  background-image: url('/css/searchicon.png');
  background-position: 10px 12px;
  background-repeat: no-repeat;
  width: 100%;
  font-size: 16px;
  padding: 12px 20px 12px 40px;
  border: 1px solid #ddd;
  margin-bottom: 12px;
}

#myUL li {
  display: none;
}

#myUL {
  list-style-type: none;
  padding: 0;
  margin: 0;
}

#myUL li a {
  border: 1px solid #ddd;
  margin-top: -1px; /* Prevent double borders */
  background-color: #f6f6f6;
  padding: 12px;
  text-decoration: none;
  font-size: 18px;
  color: black;
  display: block
}

#myUL li a:hover:not(.header) {
  background-color: #eee;
}

<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1">
</head>
<body>

<h2>Branch Email</h2>

<input type="text" id="myInput" onkeyup="myFunction()" placeholder="Enter your branch code..." title="Type in a name">

<ul id="myUL">
  <li><a href="#">Adele</a></li>
  <li><a href="#">Agnes</a></li>

  <li><a href="#">Billy</a></li>
  <li><a href="#">Bob</a></li>

  <li><a href="#">Calvin</a></li>
  <li><a href="#">Christina</a></li>
  <li><a href="#">Cindy</a></li>
</ul>



</body>
</html>

如何隐藏列表结果，直到在搜索框中收到输入？

2 个答案: