javascript 基于首字母的过滤器搜索

nwlqm0z1 于 2023-02-02 发布在 Java

关注(0)|答案(6)|浏览(175)

问题是我想以首字母优先的格式过滤列表中的单词。
正如你现在看到的，我在我的搜索字段中输入字母“a”，结果是所有与“a”相关的单词。2但是我只想要“a”开头的单词。
然后我输入“an”，结果应该是“an”开头的单词。

function myFunction() {
    var input, filter, ul, li, a, i, txtValue;
    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];
        txtValue = a.textContent || a.innerText;
        if (txtValue.toUpperCase().indexOf(filter) > -1) {
            li[i].style.display = "";
        } else {
            li[i].style.display = "none";
        }
    }
}

<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1">

</head>
<body>

<h2>My Phonebook</h2>

<input type="text" id="myInput" onkeyup="myFunction()" placeholder="Search for names.." title="Type in a name">

<ul id="myUL">
  <li><a href="#">Adele</a></li>
  <li><a href="#">Agnes</a></li>
  <li><a href="#">Agitha</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>

JavaScript

来源：https://stackoverflow.com/questions/65246748/first-letter-based-filter-search

6条答案

按热度按时间

nr9pn0ug1#

此if (txtValue.toUpperCase().indexOf(filter) > -1)应更改为

if (txtValue.toUpperCase().indexOf(filter) === 0)

x一个一个一个一个x一个一个二个x

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f45qwnt82#

您可以使用startsWith()函数来获得结果。

function myFunction() {
  var input, filter, ul, li, a, i, txtValue;
  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];
    txtValue = a.textContent || a.innerText;
    if (txtValue.toUpperCase().startsWith(filter)) {
      li[i].style.display = "";
    } else {
      li[i].style.display = "none";
    }
  }
}

<!DOCTYPE html>
<html>

<head>
  <meta name="viewport" content="width=device-width, initial-scale=1">

</head>

<body>

  <h2>My Phonebook</h2>

  <input type="text" id="myInput" onkeyup="myFunction()" placeholder="Search for names.." title="Type in a name">

  <ul id="myUL">
    <li><a href="#">Adele</a></li>
    <li><a href="#">Agnes</a></li>
    <li><a href="#">Agitha</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>

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qkf9rpyu3#

您可以改用startsWith。

if (txtValue.toUpperCase().startsWith(filter))

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yeotifhr4#

您应该使用startsWith()而不是indexOf()
在JS中替换if (txtValue.toUpperCase().indexOf(filter) > -1)
带有if (txtValue.toUpperCase().startsWith(filter))
阅读更多关于String.prototype.startsWith()

function myFunction() {
  var input, filter, ul, li, a, i, txtValue;
  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];
    txtValue = a.textContent || a.innerText;
    if (txtValue.toUpperCase().startsWith(filter)) {
      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>My Phonebook</h2>

  <input type="text" id="myInput" onkeyup="myFunction()" placeholder="Search for names.." title="Type in a name">

  <ul id="myUL">
    <li><a href="#">Adele</a></li>
    <li><a href="#">Agnes</a></li>
    <li><a href="#">Agitha</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>

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1cklez4t5#

function myFunction() {
    var input, filter, ul, li, a, i, txtValue;
    input = document.getElementById("myInput");
    filter = input.value.toUpperCase();
    let filterLength = filter.length;
    ul = document.getElementById("myUL");
    li = ul.getElementsByTagName("li");
    for (i = 0; i < li.length; i++) {
        a = li[i].getElementsByTagName("a")[0];
        txtValue = a.textContent || a.innerText;
        if (txtValue.substr(0, filterLength).toUpperCase() === filter) {
            li[i].style.display = "";
        } else {
            li[i].style.display = "none";
        }
    }
}

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qc6wkl3g6#

// this function will help you to filter array on the basis of first // letter or word
const collections = ["Ali","Ali and Asif", "Umar OR usman"];
const searchByMultipleWords = (
  collections,
  value
) => {
  return collections.filter((collection) => {
    const collectionName = collection
      ? collection.toLowerCase()
      : "";

    return collectionName.startsWith(value.toLowerCase());
  });
};
console.log(searchByMultipleWords(collections,"ali"))

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javascript 基于首字母的过滤器搜索

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