在youtube上看了一个基本的表单验证视频，似乎我的javascript文件中没有一条消息实际上是通过测试被推到网站上的......我希望登录表单上方显示错误消息，但我的代码中肯定有一些错误。
const username = document.getElementById('Username')
const password = document.getElementById('Password')
const form = document.getElementById('form')
const errorElement = document.getElementById('error')
form.addEventListener ('Login', (e) => {
let messages =[]
if (username.value === '' || username.value == null){
messages.push('username is required')
}
if (password.value.length <= 6){
messages.push('Password must be longer than 6 characters')
}
if (password.value.length >= 20){
messages.push('Password is too long')
}
if (password.value == 'password'){
messages.push('Password cant be password')
}
if (messages.length > 0){
e.preventDefault()
errorElement.innerText = messages.join(', ')
}
})body {
font-family: "Lato", sans-serif;
}
.main-head {
height: 150px;
background: #FFF;
}
.sidenav {
height: 100%;
background-color: #680C07;
overflow-x: hidden;
padding-top: 20px;
width: 100%;
}
.main {
padding: 0px 10px;
}
@media screen and (max-height: 450px) {
.sidenav {
padding-top: 15px;
}
}
@media screen and (max-width: 450px) {
.login-form {
margin-top: 10%;
}
.register-form {
margin-top: 10%;
}
}
@media screen and (min-width: 768px) {
.sidenav {
position: fixed;
z-index: 1;
top: 0;
left: 0;
}
.login-form {
margin-top: 80%;
}
.register-form {
margin-top: 20%;
}
}
.login-main-text {
margin-top: 20%;
padding: 60px;
color: #fff;
}
.login-main-text h2 {
font-weight: 300;
}
.btn-black {
background-color: #000 !important;
color: #fff;
}
.login-form {
margin-top: 20%;
padding: 20px;
}
.form-group {
margin-bottom: 20px;
}
.btn {
margin-top: 20px;
}
.alert {
color: #31708F;
background-color: #D9EDF7;
border-color: #BCE8F1;
}<!DOCTYPE HTML>
<html lang="en">
<head>
<link href="https://cdn.jsdelivr.net/npm/bootstrap@5.0.2/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-EVSTQN3/azprG1Anm3QDgpJLIm9Nao0Yz1ztcQTwFspd3yD65VohhpuuCOmLASjC" crossorigin="anonymous">
<link href="sitestyle.css" rel="stylesheet" type="text/css">
<script defer src="C:\Users\John\Downloads\capstone project\sitescript.js"></script>
<title>Excell Visualizer</title>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
</head>
<body>
<div class="sidenav">
<div class="login-main-text">
<h2>Chartcel <br> Login Page </h2>
<p>Login or register from here to upload your desired spreadsheet.</p>
</div>
<div class="main">
<div class="col-md-6 col-sm-12">
<div class="login-form">
<form id="form">
<div id="error"></div>
<div class="form-group">
<label for="username"> Username </label>
<input type="text" class="form-control" id="Username">
</div>
<div class="form-group">
<label>Password</label>
<input type="password" class="form-control" id="Password">
</div>
<button type="submit" onclick="check(this.form)" class="btn btn-black">Login</button>
<button type="submit" onclick="check(this.form)" class="btn btn-secondary"> Register</button>
</form>
</div>
</div>
</div>
</div>
</body>
</html>
1条答案
按热度按时间oknwwptz1#
尝试将JS代码中的行更改为：
在HTML DOM事件中没有'login'事件。所以你应该使用'submit'。