6 回答

TA貢獻1828條經(jīng)驗 獲得超3個贊
這if (txtValue.toUpperCase().indexOf(filter) > -1)應(yīng)該改為
if (txtValue.toUpperCase().indexOf(filter) === 0)
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) === 0) {
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>

TA貢獻1805條經(jīng)驗 獲得超10個贊
// 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"))

TA貢獻1864條經(jīng)驗 獲得超6個贊
您可以使用startsWith()函數(shù)來獲取結(jié)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>

TA貢獻1943條經(jīng)驗 獲得超7個贊
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";
}
}
}

TA貢獻1765條經(jīng)驗 獲得超5個贊
你應(yīng)該使用startsWith()
而不是indexOf()
在你的JS中替換if (txtValue.toUpperCase().indexOf(filter) > -1)
和if (txtValue.toUpperCase().startsWith(filter))
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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