使用JS实现表单验证
目录
- 表单页面展示
- FormCheck.jsp
- CSS样式
- Register.css
- JavaScript代码
- FormCheck.js
- 效果图展示
平时我们在注册账号的时候经常看到有提示xxx不得法，请重新填写字样，本文我们就实现以注册页面为例实现表单验证功能。
如果对验证码实现感兴趣的可以看这篇文章：验证码实现 - html页面版
表单页面展示
FormCheck.jsp
< html lang="en">
<head>
<meta charset="UTF-8">
<title>注册页面表单校验title>
<link rel="stylesheet" href="../css/register.css">
head>
<body>
<div class="reg_back">
<div class="reg_left">
<p>新用户注册p>
<p>USER REGISTERp>
div>
<div class="reg_center">
<div class="reg_form">
<form action="#" method="post" id="form">
<table>
<tr>
<td class="td_left"><label for="username">用户名label>td>
<td class="td_right"><input type="text" name="username" placeholder="请输入用户名(英文字符或数字)"
id="username">
<span id="s_username" class="error">span>
td>
tr>
<tr>
<td class="td_left"><label for="password">密码label>td>
<td class="td_right"><input type="password" name="password" placeholder="请输入密码（长度在6~12位之间）"
id="password">
<span id="s_password" class="error">span>
td>
tr>
<tr>
<td class="td_left"><label for="Email">Emaillabel>td>
<td class="td_right"><input type="email" name="email" placeholder="请输入Email" id="Email">
<span id="s_email" class="error">span>
td>
tr>
<tr>
<td class="td_left"><label for="rename">姓名label>td>
<td class="td_right"><input type="text" name="rename" placeholder="请输入真实姓名（中文姓名）" id="rename">
<span id="s_rename" class="error">span>
td>
tr>
<tr>
<td class="td_left"><label for="Telphone">手机号label>td>
<td class="td_right"><input type="text" name="telphone" placeholder="请输入您的手机号"
id="Telphone">
<span id="s_telphone" class="error">span>
td>
tr>
<tr>
<td class="td_left"><label>性别label>td>
<td class="td_right"><input type="radio" name="gender" value="male" checked> 男
<input type="radio" name="gender" value="female"> 女
td>
tr>
<tr>
<td class="td_left"><label for="Birthday">出生日期label>td>
<td class="td_right"><input type="date" name="birthday" id="Birthday">td>
tr>
<tr>
<td class="td_left"><label for="checkcode">验证码label>td>
<td class="td_right"><input type="text" name="checkcode" id="checkcode">
<img src="../image/10.png" id="img_check">td>
tr>
<tr>
<td colspan="2" id="td_sub"><input type="submit" value="注册" id="btn_sub">td>
tr>
table>
form>
div>
div>
<div class="reg_right">
<p>已有账号?<a href="#">立即登录a>p>
div>
div>
<script src="../js2/FormCheck.js">script>
body>
CSS样式
Register.css
* {
margin: 0px;
padding: 0px;
box-sizing: border-box;
}
body {
background: url("../image/9.jpg") no-repeat center;
/*设置图片适应整个页面*/
background-size: 100% 100%;
background-attachment:fixed;
}
.reg_back {
/*设置整体的尺寸、背景色、边距等*/
width: 900px;
height: 400px;
border: 8px solid #eeeeee;
background: white;
margin: auto;
margin-top: 20px;
}
.reg_left {
/*设置左浮动和外边距*/
float: left;
margin: 10px;
}
.reg_left > p:first-child {
/*设置段落（新用户注册）颜色和字体大小*/
color: yellow;
font-size: 20px;
}
.reg_left > p:last-child {
/*设置段落（USER REGISTER）颜色和字体大小*/
color: #A6A6A6;
font-size: 20px;
}
.reg_center {
/*设置中间的各种输入框等*/
float: left;
width: 500px;
}
.reg_right {
/*设置右边段落浮动和外间距*/
float: right;
margin: 30px;
}
.reg_right > p:first-child {
font-size: 15px;
}
.reg_right p a {
/*设置超链接（立即登录）颜色*/
color: crimson;
}
.td_left {
/*设置表单中字体对齐方式和宽度、高度*/
width: 100px;
text-align: right;
height: 40px;
}
.td_right {
/*设置输入框内边距*/
padding-left: 40px;
}
#username ,#password,#Email, #rename ,#Telphone,#Birthday,#checkcode{
/*设置输入框大小和边框*/
width: 220px;
height: 30px;
border: 1px solid #A4A4A4;
/* 设置边框为圆角 */
border-radius: 8px;
padding-left: 10px;
}
#checkcode{
/*验证码宽度*/
width: 120px;
}
#img_check{
/*验证码图片*/
vertical-align: middle;
height: 30px;
width: 95px;
}
#btn_sub{
/*注册按钮*/
background: lime;
width: 100px;
height: 40px;
border: 1px solid lime ;
}
.error{
color:red;
}
#td_sub{
padding-left: 150px;
}
JavaScript代码
FormCheck.js
window.onload = function () {
//给表单绑定onsubmit事件
document.getElementById("form").onsubmit = function () {
return checkUsername() && checkPassword() &&checkEmail() && checkRename() && checkTelphone();
}
//给用户名和密码框、Email、姓名、手机号分别绑定离焦事件
document.getElementById("username").onblur = checkUsername;
document.getElementById("password").onblur = checkPassword;
document.getElementById("Email").onblur = checkEmail;
document.getElementById("rename").onblur = checkRename;
document.getElementById("Telphone").onblur = checkTelphone;
}
//校验用户名
function checkUsername() {
//获取用户名的值
var username = document.getElementById("username").value;
//定义正则表达式
var reg_username = /^([a-zA-Z0-9_-])/;
//判断值是否符合正则表达式的规则
var flag = reg_username.test(username);
//提示信息
var s_username = document.getElementById("s_username");
if (flag) {
//提示绿色对勾
s_username.innerHTML = "
";
} else {
//提示红色错误信息
s_username.innerHTML = "用户名格式有误！";
}
return flag;
}
//校验密码
function checkPassword(){
//1.获取密码的值
var password = document.getElementById("password").value;
//2.定义正则表达式
var reg_password = /^\w{6,12}$/;
//3.判断值是否符合正则的规则
var flag = reg_password.test(password);
//4.提示信息
var s_password = document.getElementById("s_password");
if(flag){
//提示绿色对勾
s_password.innerHTML = "";
}else{
//提示红色错误信息
s_password.innerHTML = "密码格式有误";
}
return flag;
}
//校验Email
function checkEmail(){
//1.获取Email的值
var email = document.getElementById("Email").value;
//2.定义正则表达式
var reg_email = /^([a-zA-Z0-9_-])+@([a-zA-Z0-9_-])+(\.[a-zA-Z0-9_-])+/;
//3.判断值是否符合正则的规则
var flag = reg_email.test(email);
//4.提示信息
var s_email = document.getElementById("s_email");
if(flag){
//提示绿色对勾
s_email.innerHTML = "";
}else{
//提示红色错误信息
s_email.innerHTML = "Email格式有误";
}
return flag;
}
//校验真实姓名
function checkRename(){
//1.获取真实姓名的值
var rename = document.getElementById("rename").value;
//2.定义正则表达式
var reg_rename = /^[\u4e00-\u9fa5]{2,4}$/;
//3.判断值是否符合正则的规则
var flag = reg_rename.test(rename);
//4.提示信息
var s_rename = document.getElementById("s_rename");
if(flag){
//提示绿色对勾
s_rename.innerHTML = "";
}else{
//提示红色错误信息
s_rename.innerHTML = "真实姓名输入有误";
}
return flag;
}
//校验手机号
function checkTelphone(){
//1.获取手机号的值
var telphone = document.getElementById("Telphone").value;
//2.定义正则表达式
var reg_telphone = /^(((13[0-9]{1})|(15[0-9]{1})|(18[0-9]{1}))+\d{8})$/;
//3.判断值是否符合正则的规则
var flag = reg_telphone.test(telphone);
//4.提示信息
var s_telphone = document.getElementById("s_telphone");
if(flag){
//提示绿色对勾
s_telphone.innerHTML = "";
}else{
//提示红色错误信息
s_telphone.innerHTML = "手机号输入有误";
}
return flag;
}
效果图展示
好了，我亲爱的读者朋友，以上就是本文的全部内容了！！！
觉得有点用记得给我点赞哦！
通过坚持不懈地学习，持续不断地输出，你的编程基本功算得上是突飞猛进。
为了帮助更多的程序员，专注于分享有趣的 Java 技术编程和有益的程序人生。一开始，阅读量寥寥无几，关注人数更是少得可怜。但随自己的不断努力，阅读量和关注人都在猛烈攀升。
绝对不容错过，期待与你的不期而遇。