如何在 sidenav 中自动对焦文本框

Question

所以我使用的是带有文本框的 sidenav，类似于 w3schools 中的示例代码：

 <!DOCTYPE html>
    <html>
    <head>
    <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <style>
    body {
        font-family: "Lato", sans-serif;
    }
    
    .sidenav {
        height: 100%;
        width: 0;
        position: fixed;
        z-index: 1;
        top: 0;
        left: 0;
        background-color: #111;
        overflow-x: hidden;
        transition: 0.5s;
        padding-top: 60px;
    }
    
    .sidenav a {
        padding: 8px 8px 8px 32px;
        text-decoration: none;
        font-size: 25px;
        color: #818181;
        display: block;
        transition: 0.3s;
    }
    
    .sidenav a:hover {
        color: #f1f1f1;
    }
    
    .sidenav .closebtn {
        position: absolute;
        top: 0;
        right: 25px;
        font-size: 36px;
        margin-left: 50px;
    }
    
    @media screen and (max-height: 450px) {
      .sidenav {padding-top: 15px;}
      .sidenav a {font-size: 18px;}
    }
    </style>
    </head>
    <body>
    
    <div id="mySidenav" class="sidenav">
      <a href="javascript:void(0)" class="closebtn" onclick="closeNav()">&times;</a>
      <a href="#"><input type="text" autofocus="autofocus"/></a>
    </div>
    
    <span style="font-size:30px;cursor:pointer" onclick="openNav()">&#9776; open</span>
    
    <script>
    function openNav() {
        document.getElementById("mySidenav").style.width = "250px";
    }
    
    function closeNav() {
        document.getElementById("mySidenav").style.width = "0";
    }
     $(document).keyup(function(e) {
      if (e.keyCode == 27) {closeNav()} // escape
      if (e.keyCode == 83) {openNav()}  //s
    });
    </script>

   
         
    </body>
    </html>

我想在 sidenav 打开时自动聚焦文本框。使用 autofocus = "autofocus" 似乎不起作用（就像我在上面的示例中尝试的那样）。我还希望它与我在代码中定义的 keyup 函数结合使用（按 'esc' 关闭，按 's' 打开）。提前致谢。

Answer 1

您可以将 openNav() 函数更改为类似这样的内容

function openNav() {
    var sideNav = document.getElementById("mySidenav");
    sideNav.style.width = "250px";
    
    var input = sideNav.getElementsByTagName("input")
    
    if (input && input[0]) {
      input[0].focus()
    }
}

你会很高兴的:)

Answer 2

给id="f"到input标签和在打开导航功能中

document.getElementById("f").focus();

<!DOCTYPE html>
    <html>
    <head>
    <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <style>
    body {
        font-family: "Lato", sans-serif;
    }
    
    .sidenav {
        height: 100%;
        width: 0;
        position: fixed;
        z-index: 1;
        top: 0;
        left: 0;
        background-color: #111;
        overflow-x: hidden;
        transition: 0.5s;
        padding-top: 60px;
    }
    
    .sidenav a {
        padding: 8px 8px 8px 32px;
        text-decoration: none;
        font-size: 25px;
        color: #818181;
        display: block;
        transition: 0.3s;
    }
    
    .sidenav a:hover {
        color: #f1f1f1;
    }
    
    .sidenav .closebtn {
        position: absolute;
        top: 0;
        right: 25px;
        font-size: 36px;
        margin-left: 50px;
    }
    
    @media screen and (max-height: 450px) {
      .sidenav {padding-top: 15px;}
      .sidenav a {font-size: 18px;}
    }
    </style>
    </head>
    <body>
    
    <div id="mySidenav" class="sidenav">
      <a href="javascript:void(0)" class="closebtn" onclick="closeNav()">&times;</a>
      <a href="#"><input type="text" id="f"></a>
    </div>
    
    <span style="font-size:30px;cursor:pointer" onclick="openNav()">&#9776; open</span>
    
    <script>
    function openNav() {
        document.getElementById("mySidenav").style.width = "250px";
        document.getElementById("f").focus();
    }
    
    function closeNav() {
        document.getElementById("mySidenav").style.width = "0";
    }
     $(document).keyup(function(e) {
      if (e.keyCode == 27) {closeNav()} // escape
      if (e.keyCode == 83) {openNav()}  //s
    });
    </script>

   
         
    </body>
    </html>

如何在 sidenav 中自动对焦文本框

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