我在页脚中有一个表单，现在我只想记录name字段的值。为此，我在queryselector的末尾添加了.value属性。不幸的是，这无法正常工作。
我的JS看起来像这样
submit.addEventListener('click', function(e) {
e.preventDefault();
let name = document.querySelector('#name').value;
console.log(name);
})
由于某种原因，我得到一个空字符串。任何想法
const navLinks = document.querySelectorAll('.nav-links .link');
const linksArray = Array.from(document.querySelectorAll('.links div'));
const header = document.querySelector('header');
const submit = document.querySelector('#submit');
for (var i = 0; i < navLinks.length; i++) {
navLinks[i].addEventListener('click', changeColor);
}
for (var i = 0; i < linksArray.length; i++) {
linksArray[i].addEventListener('click', shuffle);
}
function changeColor() {
let hexArray = [0, 1, 2, 3, 4, 5, 6, 'A', 'B', 'C', 'D', 'E', 'F'];
let hexColor = '#';
for(let i = 0; i < 6; i++) {
let random = Math.floor(Math.random()*hexArray.length);
hexColor += hexArray[random];
}
header.style.background = hexColor;
setTimeout(function() {
header.style.backgroundImage = 'url(img/canada.jpeg)';
}, 2000);
}
function shuffle() { // Fisher-Yates shuffle algorithm
for (let i = linksArray.length - 1; i > 0; i--) {
let j = Math.floor(Math.random() * (i + 1));
[linksArray[i].innerHTML, linksArray[j].innerHTML] = [linksArray[j].innerHTML, linksArray[i].innerHTML];
}
}
submit.addEventListener('click', function(e) {
e.preventDefault();
let name = document.querySelector('#name').value;
console.log(name);
})html, body {
margin: 0;
padding: 0;
}
body {
font-family: 'Verdana';
box-sizing: border-box;
color: #63889b;
}
/*
* {
outline: 1px solid red;
}*/
/*------NAV-----*/
nav {
display: flex;
justify-content: space-between;
font-size: 1.8rem;
padding: 25px 0;
position: fixed;
background-color: #fff;
width: 100%;
top: 0;
left: 0;
right: 0;
z-index: 10;
}
.brand, .nav-links {
display: flex;
align-items: center;
}
.brand {
margin-left: 6%;
}
.logo {
max-width: 70px;
max-height: 45px;
margin-right: 25px;
}
.nav-links {
position: relative;
margin-right: 6%;
}
.nav-links .link {
text-transform: uppercase;
margin-right: 20px;
cursor: pointer;
transition: all .2s ease;
}
.nav-links .link:hover {
color: #014263;
}
/*-----HEADER-----*/
header {
margin-top: 92px;
background-image: url(img/canada.jpeg);
/*background-position: center;
background-size: cover;*/
padding-top: 7%;
padding-bottom: 25%;
}
.header-info {
color: #fff;
font-size: 1.5rem;
width: 22.5%;
background-color: rgba(0,0,0,0.6);
padding: 35px;
margin-left: 10%;
}
header p {
margin: 0;
padding: 0;
}
header p:first-child {
margin-bottom: 25px;
}
/*-----MAIN-----*/
main {
display: flex;
background-color: #fff;
}
.col {
flex-basis: 33.33%;
padding: 50px 0;
}
.col p {
width: 65%;
font-size: 1.25rem;
text-align: center;
margin-left: auto;
margin-right: auto;
}
.col img {
display: block;
margin: 0 auto;
}
.col-3 img {
width: 280px;
height: 155px;
}
.col-3 img, .col-3 h3, .col-3 p {
position: relative;
top: -8px;
}
.col-2 img, .col-2 h3, .col-2 p {
position: relative;
top: 30px;
}
.col-1 {
margin-left: 7%;
}
.col-3 {
margin-right: 7%;
}
h3 {
text-align: center;
}
/*------FOOTER-----*/
footer {
font-family: 'Helvetica';
background-color: #63889b;
display: flex;
justify-content: space-between;
color: #fff;
padding-bottom: 30px;
}
.internal-links {
padding-left: 15%;
font-size: 1.5rem;
}
.links div {
margin:2px 0;
cursor: pointer;
}
.internal-links h4 {
text-decoration: underline;
text-align: center;
margin-bottom: 8px;
margin-top: 30PX;
color: #fff;
}
.links {
font-size: 1.2rem;
display: flex;
flex-direction: column;
}
.form-wrap {
padding-top: 30px;
display: flex;
align-items: flex-end;
flex-basis: 50%;
}
form {
margin: 0 100px 0 0;
display: flex;
flex-direction: column;
width: 100%;
}
input {
border: none;
outline: none;
font-size: 1.6rem;
}
label {
font-size: 1.3rem;
padding: 3px 0;
}
button {
margin-top: 20px;
border: 1px solid #fff;
width: 50%;
font-size: 1.3rem;
background-color: #1090d1;
align-self: flex-end;
color: #fff;
padding: 4px 30px;
}
/*.dialog-wrap {
background-color: rgba(0,0,0,0.7);
position: fixed;
width: 100%;
height: 100%;
top: 0px;
left: 0px;
z-index: 1000;
}*/
/*dialog {
position: fixed;
top: 0;
left: 0;
right: 0;
bottom: 0;
width: 500px;
height: 215px;
border: none;
display: flex;
flex-direction: column;
justify-content: flex-start;
}
dialog div {
font-size: 1.4rem;
color: #fff;
margin: 10px 0;
outline: 1px solid #63889b;
}
dialog div:first-child {
margin-top: 0px;
}
dialog .label {
background-color: #63889b;
padding: 7px;
display: inline-block;
width: 30%;
margin: 0;
text-align: center;
}
dialog .info {
display: inline-block;
}
dialog .buttons {
outline: none;
display: flex;
justify-content: space-between;
}
dialog button {
border: none;
width: 49%;
margin: 0;
}*/<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Chapman Automotive Skills Assessment</title>
<link rel="stylesheet" href="style.css">
</head>
<body>
<nav>
<div class="brand">
<img src="img/Logo.png" alt="logo" class="logo">
<div class="comp-name">CHAPMAN</div>
</div>
<div class="nav-links">
<div class="link">Home</div>
<div class="link">Sales</div>
<div class="link">Blog</div>
<div class="link">Login</div>
</div>
</nav>
<header>
<div class="header-info">
<p>We are a company that does stuff.</p>
<p>Car and web stuff.</p>
</div>
</header>
<main>
<div class="col col-1">
<img src="img/car1.jpg" alt="car1">
<h3>Some Header</h3>
<p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Explicabo tempore quia enim quod, perferendis illum quae id, natus dolores temporibus. Lorem ipsum dolor sit amet, consectetur adipisicing elit. Obcaecati, rem. Lorem ipsum dolor sit amet, consectetur adipisicing elit. Necessitatibus tenetur mollitia officiis laudantium dolore ipsa.</p>
</div>
<div class="col col-2">
<img src="img/car2.jpg" alt="car2">
<h3>More Stuff</h3>
<p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Explicabo tempore quia enim quod, perferendis illum quae id, natus dolores temporibus. Lorem ipsum dolor sit amet, consectetur adipisicing elit. Illo, dolor. Lorem ipsum dolor sit amet, consectetur adipisicing elit. Perspiciatis, neque. Corporis quisquam eligendi libero omnis.</p>
</div>
<div class="col col-3">
<img src="img/car3.jpg" alt="car3">
<h3>Last Column</h3>
<p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Explicabo tempore quia enim quod, perferendis illum quae id, natus dolores temporibus. Lorem ipsum dolor sit amet, consectetur adipisicing elit. Esse, ipsa. Lorem ipsum dolor sit amet, consectetur adipisicing elit. Quod quae, nihil error delectus voluptatum deserunt.</p>
</div>
</main>
<footer id="footer">
<div class="internal-links">
<h4>Internal Links</h4>
<div class="links">
<div>Page One</div>
<div>Another Page</div>
<div>Sales Page</div>
<div>Page Three</div>
<div>Keep Going</div>
<div>Last One</div>
<div>Just Kidding</div>
</div>
</div>
<div class="form-wrap">
<form>
<label for="Name">Name</label>
<input type="text" id="Name" required>
<label for="Name">Address</label>
<input type="text" id="Address" required>
<label for="Name">City</label>
<input type="text" id="City" required>
<button type="submit" id="submit">Submit Form</button>
</form>
<div class="dialog-wrap">
<dialog>
<div><span class="label">Name:</span><input type="text" class="info"></div>
<div><span class="label">Address:</span><input type="text" class="info"></div>
<div><span class="label">City:</span><input type="text" class="info"></div>
<div class="buttons"><button>Edit</button><button>Correct</button></div>
</dialog>
</div>
</footer>
<script src="script.js"></script>
</body>
</html>
答案 0 :(得分：1)
您没有得到一个空字符串，它引发了TypeError: Cannot read property 'value' of null错误，因为元素的ID为“ Name”并且查询选择器为'#name'（而不是"Name"）。
这是您代码的有效版本：
const navLinks = document.querySelectorAll('.nav-links .link');
const linksArray = Array.from(document.querySelectorAll('.links div'));
const header = document.querySelector('header');
const submit = document.querySelector('#submit');
for (var i = 0; i < navLinks.length; i++) {
navLinks[i].addEventListener('click', changeColor);
}
for (var i = 0; i < linksArray.length; i++) {
linksArray[i].addEventListener('click', shuffle);
}
function changeColor() {
let hexArray = [0, 1, 2, 3, 4, 5, 6, 'A', 'B', 'C', 'D', 'E', 'F'];
let hexColor = '#';
for(let i = 0; i < 6; i++) {
let random = Math.floor(Math.random()*hexArray.length);
hexColor += hexArray[random];
}
header.style.background = hexColor;
setTimeout(function() {
header.style.backgroundImage = 'url(img/canada.jpeg)';
}, 2000);
}
function shuffle() { // Fisher-Yates shuffle algorithm
for (let i = linksArray.length - 1; i > 0; i--) {
let j = Math.floor(Math.random() * (i + 1));
[linksArray[i].innerHTML, linksArray[j].innerHTML] = [linksArray[j].innerHTML, linksArray[i].innerHTML];
}
}
submit.addEventListener('click', function(e) {
e.preventDefault();
let name = document.querySelector('#Name').value;
console.log(name);
})html, body {
margin: 0;
padding: 0;
}
body {
font-family: 'Verdana';
box-sizing: border-box;
color: #63889b;
}
/*
* {
outline: 1px solid red;
}*/
/*------NAV-----*/
nav {
display: flex;
justify-content: space-between;
font-size: 1.8rem;
padding: 25px 0;
position: fixed;
background-color: #fff;
width: 100%;
top: 0;
left: 0;
right: 0;
z-index: 10;
}
.brand, .nav-links {
display: flex;
align-items: center;
}
.brand {
margin-left: 6%;
}
.logo {
max-width: 70px;
max-height: 45px;
margin-right: 25px;
}
.nav-links {
position: relative;
margin-right: 6%;
}
.nav-links .link {
text-transform: uppercase;
margin-right: 20px;
cursor: pointer;
transition: all .2s ease;
}
.nav-links .link:hover {
color: #014263;
}
/*-----HEADER-----*/
header {
margin-top: 92px;
background-image: url(img/canada.jpeg);
/*background-position: center;
background-size: cover;*/
padding-top: 7%;
padding-bottom: 25%;
}
.header-info {
color: #fff;
font-size: 1.5rem;
width: 22.5%;
background-color: rgba(0,0,0,0.6);
padding: 35px;
margin-left: 10%;
}
header p {
margin: 0;
padding: 0;
}
header p:first-child {
margin-bottom: 25px;
}
/*-----MAIN-----*/
main {
display: flex;
background-color: #fff;
}
.col {
flex-basis: 33.33%;
padding: 50px 0;
}
.col p {
width: 65%;
font-size: 1.25rem;
text-align: center;
margin-left: auto;
margin-right: auto;
}
.col img {
display: block;
margin: 0 auto;
}
.col-3 img {
width: 280px;
height: 155px;
}
.col-3 img, .col-3 h3, .col-3 p {
position: relative;
top: -8px;
}
.col-2 img, .col-2 h3, .col-2 p {
position: relative;
top: 30px;
}
.col-1 {
margin-left: 7%;
}
.col-3 {
margin-right: 7%;
}
h3 {
text-align: center;
}
/*------FOOTER-----*/
footer {
font-family: 'Helvetica';
background-color: #63889b;
display: flex;
justify-content: space-between;
color: #fff;
padding-bottom: 30px;
}
.internal-links {
padding-left: 15%;
font-size: 1.5rem;
}
.links div {
margin:2px 0;
cursor: pointer;
}
.internal-links h4 {
text-decoration: underline;
text-align: center;
margin-bottom: 8px;
margin-top: 30PX;
color: #fff;
}
.links {
font-size: 1.2rem;
display: flex;
flex-direction: column;
}
.form-wrap {
padding-top: 30px;
display: flex;
align-items: flex-end;
flex-basis: 50%;
}
form {
margin: 0 100px 0 0;
display: flex;
flex-direction: column;
width: 100%;
}
input {
border: none;
outline: none;
font-size: 1.6rem;
}
label {
font-size: 1.3rem;
padding: 3px 0;
}
button {
margin-top: 20px;
border: 1px solid #fff;
width: 50%;
font-size: 1.3rem;
background-color: #1090d1;
align-self: flex-end;
color: #fff;
padding: 4px 30px;
}
/*.dialog-wrap {
background-color: rgba(0,0,0,0.7);
position: fixed;
width: 100%;
height: 100%;
top: 0px;
left: 0px;
z-index: 1000;
}*/
/*dialog {
position: fixed;
top: 0;
left: 0;
right: 0;
bottom: 0;
width: 500px;
height: 215px;
border: none;
display: flex;
flex-direction: column;
justify-content: flex-start;
}
dialog div {
font-size: 1.4rem;
color: #fff;
margin: 10px 0;
outline: 1px solid #63889b;
}
dialog div:first-child {
margin-top: 0px;
}
dialog .label {
background-color: #63889b;
padding: 7px;
display: inline-block;
width: 30%;
margin: 0;
text-align: center;
}
dialog .info {
display: inline-block;
}
dialog .buttons {
outline: none;
display: flex;
justify-content: space-between;
}
dialog button {
border: none;
width: 49%;
margin: 0;
}*/<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Chapman Automotive Skills Assessment</title>
<link rel="stylesheet" href="style.css">
</head>
<body>
<nav>
<div class="brand">
<img src="img/Logo.png" alt="logo" class="logo">
<div class="comp-name">CHAPMAN</div>
</div>
<div class="nav-links">
<div class="link">Home</div>
<div class="link">Sales</div>
<div class="link">Blog</div>
<div class="link">Login</div>
</div>
</nav>
<header>
<div class="header-info">
<p>We are a company that does stuff.</p>
<p>Car and web stuff.</p>
</div>
</header>
<main>
<div class="col col-1">
<img src="img/car1.jpg" alt="car1">
<h3>Some Header</h3>
<p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Explicabo tempore quia enim quod, perferendis illum quae id, natus dolores temporibus. Lorem ipsum dolor sit amet, consectetur adipisicing elit. Obcaecati, rem. Lorem ipsum dolor sit amet, consectetur adipisicing elit. Necessitatibus tenetur mollitia officiis laudantium dolore ipsa.</p>
</div>
<div class="col col-2">
<img src="img/car2.jpg" alt="car2">
<h3>More Stuff</h3>
<p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Explicabo tempore quia enim quod, perferendis illum quae id, natus dolores temporibus. Lorem ipsum dolor sit amet, consectetur adipisicing elit. Illo, dolor. Lorem ipsum dolor sit amet, consectetur adipisicing elit. Perspiciatis, neque. Corporis quisquam eligendi libero omnis.</p>
</div>
<div class="col col-3">
<img src="img/car3.jpg" alt="car3">
<h3>Last Column</h3>
<p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Explicabo tempore quia enim quod, perferendis illum quae id, natus dolores temporibus. Lorem ipsum dolor sit amet, consectetur adipisicing elit. Esse, ipsa. Lorem ipsum dolor sit amet, consectetur adipisicing elit. Quod quae, nihil error delectus voluptatum deserunt.</p>
</div>
</main>
<footer id="footer">
<div class="internal-links">
<h4>Internal Links</h4>
<div class="links">
<div>Page One</div>
<div>Another Page</div>
<div>Sales Page</div>
<div>Page Three</div>
<div>Keep Going</div>
<div>Last One</div>
<div>Just Kidding</div>
</div>
</div>
<div class="form-wrap">
<form>
<label for="Name">Name</label>
<input type="text" id="Name" required>
<label for="Name">Address</label>
<input type="text" id="Address" required>
<label for="Name">City</label>
<input type="text" id="City" required>
<button type="submit" id="submit">Submit Form</button>
</form>
<div class="dialog-wrap">
<dialog>
<div><span class="label">Name:</span><input type="text" class="info"></div>
<div><span class="label">Address:</span><input type="text" class="info"></div>
<div><span class="label">City:</span><input type="text" class="info"></div>
<div class="buttons"><button>Edit</button><button>Correct</button></div>
</dialog>
</div>
</footer>
<script src="script.js"></script>
</body>
</html>
答案 1 :(得分：0)
我发现您的代码在控制台中显示此错误：
TypeError：无法读取空错误的属性“值”
这意味着，当您尝试检索#name的值时，会得到一个空字符串，这是因为您定义的元素的ID在此处Name是<input type="text" id="Name" required>。
只需将您的id定义替换为name，address和city：
<input type="text" id="name" required>
<input type="text" id="address" required>
<input type="text" id="city" required>
这是一个示例：
const submit = document.querySelector('#submit');
submit.addEventListener('click', function(e) {
e.preventDefault();
let name = document.querySelector('#name').value;
let address = document.querySelector('#address').value;
let city = document.querySelector('#city').value;
console.log({name: name, address: address, city: city});
})html,
body {
margin: 0;
padding: 0;
}
body {
font-family: 'Verdana';
box-sizing: border-box;
color: #63889b;
}
/*
* {
outline: 1px solid red;
}*/
/*------NAV-----*/
nav {
display: flex;
justify-content: space-between;
font-size: 1.8rem;
padding: 25px 0;
position: fixed;
background-color: #fff;
width: 100%;
top: 0;
left: 0;
right: 0;
z-index: 10;
}
.brand,
.nav-links {
display: flex;
align-items: center;
}
.brand {
margin-left: 6%;
}
.logo {
max-width: 70px;
max-height: 45px;
margin-right: 25px;
}
.nav-links {
position: relative;
margin-right: 6%;
}
.nav-links .link {
text-transform: uppercase;
margin-right: 20px;
cursor: pointer;
transition: all .2s ease;
}
.nav-links .link:hover {
color: #014263;
}
/*------FOOTER-----*/
footer {
font-family: 'Helvetica';
background-color: #63889b;
display: flex;
justify-content: space-between;
color: #fff;
padding-bottom: 30px;
}
.internal-links {
padding-left: 15%;
font-size: 1.5rem;
}
.links div {
margin: 2px 0;
cursor: pointer;
}
.internal-links h4 {
text-decoration: underline;
text-align: center;
margin-bottom: 8px;
margin-top: 30PX;
color: #fff;
}
.links {
font-size: 1.2rem;
display: flex;
flex-direction: column;
}
.form-wrap {
padding-top: 30px;
display: flex;
align-items: flex-end;
flex-basis: 50%;
}
form {
margin: 0 100px 0 0;
display: flex;
flex-direction: column;
width: 100%;
}
input {
border: none;
outline: none;
font-size: 1.6rem;
}
label {
font-size: 1.3rem;
padding: 3px 0;
}
button {
margin-top: 20px;
border: 1px solid #fff;
width: 50%;
font-size: 1.3rem;
background-color: #1090d1;
align-self: flex-end;
color: #fff;
padding: 4px 30px;
}<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Chapman Automotive Skills Assessment</title>
<link rel="stylesheet" href="style.css">
</head>
<body>
<footer id="footer">
<div class="internal-links">
<h4>Internal Links</h4>
<div class="links">
<div>Page One</div>
</div>
</div>
<div class="form-wrap">
<form>
<label for="Name">Name</label>
<input type="text" id="name" required>
<label for="Name">Address</label>
<input type="text" id="address" required>
<label for="Name">City</label>
<input type="text" id="city" required>
<button type="submit" id="submit">Submit Form</button>
</form>
<div class="dialog-wrap">
<dialog>
<div><span class="label">Name:</span><input type="text" class="info"></div>
<div><span class="label">Address:</span><input type="text" class="info"></div>
<div><span class="label">City:</span><input type="text" class="info"></div>
<div class="buttons"><button>Edit</button><button>Correct</button></div>
</dialog>
</div>
</footer>
<script src="script.js"></script>
</body>
</html>