【发布时间】：2017-11-06 13:02:56
【问题描述】：
我对 Javascript 很陌生。我已经做了一个登录模板，它就像一个魅力。我的问题是如何设置验证和导航，例如 if(username==root && password==root) 然后它应该重定向到其他页面。我只是发布我的代码。我没有包含css代码。然后我在 html 中编写了这段代码，因为我尝试编写 javascript，但我不知道如何处理。
我的代码：
<!DOCTYPE html>
<html>
<style>
/* Full-width input fields */
input[type=text], input[type=password] {
width: 100%;
padding: 12px 20px;
margin: 8px 0;
display: inline-block;
border: 1px solid #ccc;
box-sizing: border-box;
}
/* Set a style for all buttons */
button {
background-color: #0077B5;
color: white;
padding: 14px 20px;
margin: 8px 0;
border: none;
cursor: pointer;
width: 100%;
}
button:hover {
opacity: 0.8;
}
/* Extra styles for the cancel button */
.cancelbtn {
width: auto;
padding: 10px 18px;
background-color: #f44336;
}
/* Center the image and position the close button */
.imgcontainer {
text-align: center;
margin: 10px 0 5px 0;
position: relative;
}
img.cisco{
width: 30%;
border-radius: 30%;
}
.container {
padding: 10px;
}
span.psw {
float: right;
padding-top: 16px;
}
/* The Modal (background) */
.modal {
display: none; /* Hidden by default */
position: fixed; /* Stay in place */
z-index: 1; /* Sit on top */
left: 0;
top: 0;
width: 100%; /* Full width */
height: 100%; /* Full height */
/*overflow: auto; Enable scroll if needed */
background-color: rgb(0,0,0); /* Fallback color */
background-color: rgba(0,0,0,0.4); /* Black w/ opacity */
padding-top: 5px;
}
/* Modal Content/Box */
.modal-content {
background-color: #fefefe;
margin: 5% auto 15% auto; /* 5% from the top, 15% from the bottom and centered */
border: 1px solid #888;
width: 80%; /* Could be more or less, depending on screen size */
}
/* The Close Button (x) */
.close {
position: absolute;
right: 25px;
top: 0;
color: #000;
font-size: 35px;
font-weight: bold;
}
.close:hover,
.close:focus {
color: red;
cursor: pointer;
}
/* Add Zoom Animation */
.animate {
-webkit-animation: animatezoom 0.6s;
animation: animatezoom 0.6s
}
@-webkit-keyframes animatezoom {
from {-webkit-transform: scale(0)}
to {-webkit-transform: scale(1)}
}
@keyframes animatezoom {
from {transform: scale(0)}
to {transform: scale(1)}
}
/* Change styles for span and cancel button on extra small screens */
@media screen and (max-width: 200px) {
span.psw {
display: block;
float: none;
}
.cancelbtn {
width: 100%;
}
.Center {
display: flex;
align-items: center;
justify-content: center;
}
}
</style>
<body>
<h2><text-align:center>Authentication Required</h2>
<button onclick="document.getElementById('id01').style.display='block'">Login</button>
<div id="id01" class="modal">
<form class="modal-content animate" method="post" name="myform">
<div class="imgcontainer">
<span onclick="document.getElementById('id01').style.display='none'" class="close" title="Close Modal">×</span>
<img src="../images/cisco1.png" alt="Cisco" class="cisco">
</div>
<div class="container">
<label><b>Username</b></label>
<input type="text" id="username" placeholder="Enter Username" name="uname" required>
<label><b>Password</b></label>
<input type="password" id="password" placeholder="Enter Password" name="psw" required>
<button type="submit" id="login" onclick="validate()">Login</button>
<input type="checkbox" checked="checked"> Remember me
</div>
<div class="container" style="background-color:#f1f1f1">
<button type="button" onclick="document.getElementById('id01').style.display='none'" class="cancelbtn">Cancel</button>
<span class="psw">Forgot <a href="#">password?</a></span>
</div>
</form>
</div>
<script>
var attempt = 3; //Variable to count number of attempts
//Below function Executes on click of login button
function validate(){
var username = document.getElementById("username").value;
var password = document.getElementById("password").value;
if ( username == "root" && password == "root"){
alert ("Login successfully");
console.log("Redirecting to welcome page...")
window.location = "success_new.html"; //redirecting to other page
return false;
}
else{
attempt --;//Decrementing by one
alert("You have left "+attempt+" attempt;");
}
//Disabling fields after 3 attempts
if( attempt == 0){
document.getElementById("username").disabled = true;
document.getElementById("password").disabled = true;
document.getElementById("submit").disabled = true;
return false;
}
}
</script>
</body>
</html>
【问题讨论】：
-
除非你只是为了练习而玩这个，否则我建议不要在前端验证凭据，因为理论上任何人都可以操纵该验证。
-
使用
document.getElementById获取值并将其保存在 var 中，然后进行验证。我不知道您在这方面遇到了什么困难 -
@lalithkumar 或
document.getElementByNames -
无论现在他在表单中只有名称属性。他可以添加id或通过名称获取值
-
@Chris 是的，我知道，但我没有多少时间来报告这就是我发布这个问题的原因。谢谢
标签： javascript html login