时间戳

首页 > 解决方案 > 如何在 Javascript 中创建搜索栏以检查项目是否与输入匹配？

javascript - 如何在 Javascript 中创建搜索栏以检查项目是否与输入匹配？

问题描述

我正在尝试用 Javascript 制作一个搜索栏，到目前为止它只工作了一点。它将检查 a 标签中是否有输入值，但它也会显示在单词末尾找到它的时间 - 例如 c 将匹配 CSS 和 Javascript（因为 Javascript 中也有 ac）。

function myFunction() {
  var input, filter, ul, li, a, i;
  input = document.getElementById("mySearch");
  filter = input.value.toUpperCase();
  ul = document.getElementById("myMenu");
  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";
    }
  }
}
body {
  font-family: Arial, Helvetica, sans-serif;
}

* {
  box-sizing: border-box;
}

.row {
  display: flex;
}

.left {
  flex: 35%;
  padding: 15px 0;
}

.left h2 {
  padding-left: 8px;
}

.right {
  flex: 65%;
  padding: 15px;
}

#mySearch {
  width: 100%;
  font-size: 18px;
  padding: 11px;
  border: 1px solid #ddd;
}

#myMenu {
  list-style-type: none;
  padding: 0;
  margin: 0;
}

#myMenu li a {
  padding: 12px;
  text-decoration: none;
  color: black;
  display: block
}

#myMenu li a:hover {
  background-color: #eee;
}
<h2>Search Menu</h2>
<p>Start to type for a specific category inside the search bar to "filter" the search options.</p>

<div class="row">
  <div class="left" style="background-color:#bbb;">
    <h2>Menu</h2>
    <input type="text" id="mySearch" onkeyup="myFunction()" placeholder="Search.." title="Type in a category">
    <ul id="myMenu">
      <li><a href="#">HTML</a></li>
      <li><a href="#">CSS</a></li>
      <li><a href="#">JavaScript</a></li>
      <li><a href="#">PHP</a></li>
      <li><a href="#">Python</a></li>
      <li><a href="#">jQuery</a></li>
      <li><a href="#">SQL</a></li>
      <li><a href="#">Bootstrap</a></li>
      <li><a href="#">Node.js</a></li>
    </ul>
  </div>
  
  <div class="right" style="background-color:#ddd;">
    <h2>Page Content</h2>
    <p>Start to type for a specific category inside the search bar to "filter" the search options.</p>
    <p>Some text..Some text..Some text..Some text..Some text..Some text..Some text..Some text..</p>
    <p>Some other text..Some text..Some text..Some text..Some text..Some text..Some text..Some text..</p>
    <p>Some text..</p>
  </div>
</div>

我尝试检查以确保找到的值的索引小于值的长度，但它只工作一次。

function myFunction() {
  var input, filter, ul, li, a, i;
  input = document.getElementById("mySearch");
  filter = input.value.toUpperCase();
  ul = document.getElementById("myMenu");
  li = ul.getElementsByTagName("li");
  for (i = 0; i < li.length; i++) {
    a = li[i].getElementsByTagName("a")[0];
    if (a.innerHTML.toUpperCase().indexOf(filter) > -1 && a.innerHTML.toUpperCase().indexOf(filter) < input.value.length) {
      li[i].style.display = "";
    } else {
      li[i].style.display = "none";
    }
  }
}
body {
  font-family: Arial, Helvetica, sans-serif;
}

* {
  box-sizing: border-box;
}

.row {
  display: flex;
}

.left {
  flex: 35%;
  padding: 15px 0;
}

.left h2 {
  padding-left: 8px;
}

.right {
  flex: 65%;
  padding: 15px;
}

#mySearch {
  width: 100%;
  font-size: 18px;
  padding: 11px;
  border: 1px solid #ddd;
}

#myMenu {
  list-style-type: none;
  padding: 0;
  margin: 0;
}

#myMenu li a {
  padding: 12px;
  text-decoration: none;
  color: black;
  display: block
}

#myMenu li a:hover {
  background-color: #eee;
}
<h2>Search Menu</h2>
<p>Start to type for a specific category inside the search bar to "filter" the search options.</p>

<div class="row">
  <div class="left" style="background-color:#bbb;">
    <h2>Menu</h2>
    <input type="text" id="mySearch" onkeyup="myFunction()" placeholder="Search.." title="Type in a category">
    <ul id="myMenu">
      <li><a href="#">HTML</a></li>
      <li><a href="#">CSS</a></li>
      <li><a href="#">JavaScript</a></li>
      <li><a href="#">PHP</a></li>
      <li><a href="#">Python</a></li>
      <li><a href="#">jQuery</a></li>
      <li><a href="#">SQL</a></li>
      <li><a href="#">Bootstrap</a></li>
      <li><a href="#">Node.js</a></li>
    </ul>
  </div>
  
  <div class="right" style="background-color:#ddd;">
    <h2>Page Content</h2>
    <p>Start to type for a specific category inside the search bar to "filter" the search options.</p>
    <p>Some text..Some text..Some text..Some text..Some text..Some text..Some text..Some text..</p>
    <p>Some other text..Some text..Some text..Some text..Some text..Some text..Some text..Some text..</p>
    <p>Some text..</p>
  </div>
</div>

有没有办法做到这一点？

标签： javascripthtmlcss

解决方案

改变这个

if (a.innerHTML.toUpperCase().indexOf(filter) > -1)

对此

if (a.innerHTML.toUpperCase().indexOf(filter) === 0)

推荐阅读