完整的表单验证HTML网页使用JS完成用户名密码一致性和邮箱验证
<!DOCTYPE html>
<!-- 这是HTML的注释 -->
<html lang="en" id="myHtml">
<head>
<!-- 这里不是设置了编码,而是告诉浏览器,用什么编码方式打开文件避免乱码 -->
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>HtmlAll</title>
<style type="text/css">
span
{
color: red;
font-size: 12px;
}
</style>
</head>
<body>
<!-- JS包括三大块
dom指的是文档对象模型,对网页中的节点进行增删改查的过程
bom浏览器对象模型(关闭浏览器窗口,打开一个浏览器窗口,后退前进,浏览器地址栏上的地址)
ecmascript是JS的核心语法ES标准
bom的顶级对象是window(浏览器窗口),dom的顶级对象是document(HTML文档) -->
<!-- 实际上bom是包含dom的 -->
<!-- bom和DOM是包含关系 -->
<script type="text/javascript">
window.onload = function()
{
var UF = document.getElementById("usernameError");
//通过浏览器窗体获取了html元素
document.getElementById("btn").onclick = function()
{
alert(btn);
}
document.getElementById("get").onclick = function()
{
alert(document.getElementById("txt").value);
document.getElementById("nwx").value = "jack";
}
var un = document.getElementById("username");
un.onblur = function()
{
username = un.value;
username = username.trim();
if(username)
{
//代表非空
if(username.length < 6 || username.length > 14)
{
//用户名长度非法
UF.innerText = "用户名必须在6到14之间";
}
else
{
//用户名长度合法
//判断是否有非法字符
var regExp = /^[A-Za-z0-9]+$/;
if(regExp.test(username))
{
//合法
}
else
{
//不合法
UF.innerText = "用户名只能由数字和字母组成";
}
}
}
else
{
//代表空
//提示信息
UF.innerText = "用户名不能为空";
}
}
un.onfocus = function()
{
//这里要先检测再清空,这样就可以判断内容是否为空格组成用于清理
if(UF.innerText != "")
{
//清空空格内容
un.value = "";
}
//清空提示信息
UF.innerText = "";
}
document.getElementById("pwd2").onblur = function()
{
var pwd1 = document.getElementById("pwd1").value;
var pwd2 = document.getElementById("pwd2").value;
if(pwd1 != pwd2)
{
//密码错误的提示标签提示错误
document.getElementById("pwdError").innerText = "两次输入的密码不一致";
}
if(pwd1 === "" || pwd2 === "")
{
document.getElementById("pwdError").innerText = "密码不能为空";
}
}
document.getElementById("pwd2").onfocus = function()
{
if(document.getElementById("pwdError").innerText != "")
{
document.getElementById("pwdError").innerText = "";
}
}
document.getElementById("email").onblur = function()
{
var email = document.getElementById("email").value;
var emailRegExp = /^[A-Za-z0-9]+([-._][A-Za-z0-9]+)*@[A-Za-z0-9]+(-[A-Za-z0-9]+)*(\.[A-Za-z]{2,6}|[A-Za-z]{2,4}\.[A-Za-z]{2,3})$/;
if(emailRegExp.test(email))
{
}
else
{
//没过
document.getElementById("emailnameError").innerText = "必须输入一个邮箱";
}
}
document.getElementById("email").onfocus = function()
{
if(document.getElementById("emailnameError").innerText != "")
{
document.getElementById("emailnameError").innerText = "";
}
}
document.getElementById("myForm").onsubmit = function()
{
}
document.getElementById("update").onclick = function()
{
document.getElementById("username").onblur();
document.getElementById("pwd2").onblur();
document.getElementById("email").onblur();
var emailnameError = document.getElementById("emailnameError").innerText;
var emailnameError = document.getElementById("pwdError").innerText;
if(UF.innerText === "" && emailnameError === "" && pwdError === "")
{
document.getElementById("myForm").submit();
}
else
{
alert("输入信息有误");
}
}
}
</script>
<input type="button" id="btn" value="hello"/>
<input type="text" id="txt"/>
<input type="button" id="get" value="获取文本的value"/>
<input type="text" id="nwx"/>
<input type="text" value="哈哈哈哈哈哈哈哈哈" onblur="alert(this.value)"/>
<div>
<table>
<form id="myForm" action="http://www.baidu.com">
<tr>
<th>
用户名:
</th>
<th>
<input type="text" id="username"/>
</th>
<th>
<span id="usernameError"></span>
</th>
</tr>
<tr>
<th>
密码:
</th>
<th>
<input id="pwd1" type="text"/>
</th>
</tr>
<tr>
<th>
确认密码:
</th>
<th>
<input id="pwd2" type="text"/>
</th>
<th>
<span id="pwdError"></span>
</th>
</tr>
<tr>
<th>
邮箱:
</th>
<th>
<input id="email" type="email"/>
</th>
<th>
<span id="emailnameError"></span>
</th>
</tr>
<tr>
<th>
注册或重置
</th>
<th>
<input id="update" type="button" value="注册"/>
<input type="reset" value="重置"/>
</th>
</tr>
</form>
</table>
</div>
<div>
<table>
<tr>
<th>
<th>
</th>
<th>
</th>
</th>
</tr>
</table>
</div>
</body>
</html>