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javascript - 如何检查表单的有效性?

转载 作者:行者123 更新时间:2023-11-28 16:41:55 27 4
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我是网络开发新手,我试图修改此代码,这样如果上面的文本区域为空,它就不允许单击任何注册或登录按钮,我很困惑在哪里编写 if 语句这将检查这一点,但我只知道 JS 的基础知识,不知道一点关于 jQuery 的知识,我尝试添加以下内容

reg-btn.click(function(e){
if($('.pwd' ).val() == null){
alert("error");}
else{ .....remaining code..}

但是没用,有办法解决吗?原始代码来自:https://codepen.io/chouaibblgn45/pen/ZXKdXR?editors=1010

"use strict";
$(document).ready(function () {
/*------- button with class register -------*/
var reg_btn = $('.container .register');

reg_btn.click(function (e) {
e.preventDefault();
$(this).siblings('.reg').css({
'transform': 'translateY(40%) scale(5)',
'border-radius': '0',
'width': '100%',
'height': '100%'
}).end();
reg_btn.siblings('.container h3:nth-of- type(1)').css({
'top': '40%',
'z-index': '8',
}).end().end();
});

});
* {
margin: 0;
padding: 0;
-webkit-box-sizing: border-box;
-moz-box-sizing: border-box;
box-sizing: border-box;
}

body {
font-family: 'Open Sans', sans-serif;
background: #e2e2e2;
}

svg {
position: fixed;
top: 10px;
left: 180px;
}

.container {
position: relative;
top: 200px;
left: 35%;
display: block;
margin-bottom: 80px;
width: 500px;
height: 360px;
background: #fff;
border-radius: 5px;
overflow: hidden;
z-index: 1;
}

h2 {
padding: 40px;
font-weight: lighter;
text-transform: uppercase;
color: #414141;
}

input {
display: block;
height: 50px;
width: 90%;
margin: 0 auto;
border: none;
}
input::placeholder {
-webkit-transform: translateY(0px);
transform: translateY(0px);
-webkit-transition: .5s;
transition: .5s;
}
input:hover, input:focus, input:active:focus {
color: #ff5722;
outline: none;
border-bottom: 1px solid #ff5722;
}
input:hover::placeholder, input:focus::placeholder, input:active:focus::placeholder {
color: #ff5722;
position: relative;
-webkit-transform: translateY(-20px);
transform: translateY(-20px);
}

.email,
.pwd {
position: relative;
z-index: 1;
border-bottom: 1px solid rgba(0, 0, 0, 0.1);
padding-left: 20px;
font-family: 'Open Sans', sans-serif;
text-transform: uppercase;
color: #858585;
font-weight: lighter;
-webkit-transition: .5s;
transition: .5s;
}

.link {
text-decoration: none;
display: inline-block;
margin: 27px 28%;
text-transform: uppercase;
color: #858585;
font-weight: lighter;
-webkit-transition: .5s;
transition: .5s;
}

button {
cursor: pointer;
display: inline-block;
float: left;
width: 250px;
height: 60px;
margin-top: -10px;
border: none;
font-family: 'Open Sans', sans-serif;
text-transform: uppercase;
color: #fff;
-webkit-transition: .5s;
transition: .5s;
}
button:nth-of-type(1) {
background: #673ab7;
}
button:nth-of-type(2) {
background: #ff5722;
}
button span {
position: absolute;
display: block;
margin: -10px 20%;
-webkit-transform: translateX(0);
transform: translateX(0);
-webkit-transition: .5s;
transition: .5s;
}
button:hover span {
-webkit-transform: translateX(30px);
transform: translateX(30px);
}

.reg {
position: absolute;
top: 0;
left: 0;
-webkit-transform: translateY(-100%) scale(1);
transform: translateY(-100%) scale(1);
display: block;
width: 20px;
height: 20px;
border-radius: 50px;
background: #673ab7;
z-index: 5;
-webkit-transition: .8s ease-in-out;
transition: .8s ease-in-out;
}

h3 {
position: absolute;
top: -100%;
left: 20%;
text-transform: uppercase;
font-weight: bolder;
color: rgba(255, 255, 255, 0.3);
-webkit-transition: .3s ease-in-out 1.2s;
transition: .3s ease-in-out 1.2s;
}
<!DOCTYPE html>
<html>
<head>
<head>
<body>

<div class="container">
<h2>login</h2>
<form>
<input type="text" class="email" placeholder="email">
<br/>
<input type="text" class="pwd" placeholder="password">
</form>
<a href="#" class="link">
forgot your password ?
</a>
<br/>
<button class="register">
<span>register</span>
</button>
<button class="signin">
<span>sign in</span>
</button>
<h3>your registration is complete ! </h3>
<h3>your sign in is complete !</h3>
<div class="reg"></div>
<div class="sig"></div>



</div>
</body>
</html>

最佳答案

空输入字段的 .val() 将是一个不含任何字符的字符串。不是 null 值。

如果运行以下命令,您可以看到这一点

console.log(typeof $('.pwd' ).val())
// returns string

您可以将代码更改为:

reg-btn.click(function(e){
if($('.pwd' ).val().length > 0){
//form is valid
}

关于javascript - 如何检查表单的有效性?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/61061750/

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