JS simple login verification attached renderings
- 2020-03-29 23:50:48
- OfStack
The source code:
Effect realization:
< img SRC = "border = 0 / / files.jb51.net/file_images/article/201311/201311191619256.gif? 20131019161942 ">
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<meta name="Author" content=" Jiang-bo liu ">
<script type="text/javascript">
function login(){
var userName=document.getElementById("userName").value;
var pwd=document.getElementById("pwd").value;
var repwd=document.getElementById("repwd").value;
var address=document.getElementById("address").value;
var matchResult=true;
if(userName==""||pwd==""||repwd==""||address==""){
alert(" Please confirm if there is any vacancy! ");
matchResult=false;
}else if(userName.length<6||userName.length>20){
alert(" The username length should be 6 to 20 Between characters! ");
matchResult=false;
}else if(userName==pwd||userName==repwd){
alert(" Password or duplicate password cannot be the same as username! ");
matchResult=false;
}else if(pwd.length<6||pwd.length>20||repwd.length<6||repwd.length>20){
alert(" Password or duplicate password length should be in 6 to 20 Between characters! ");
matchResult=false;
}else if(pwd!=repwd){
alert(" Password and repeat password are different, please re-enter! ");
matchResult=false;
}else if(userName.length<6||userName.length>20){
alert(" The username length should be 6 to 20 Between characters! ");
matchResult=false;
}
if(matchResult==true){
var mailreg = /^w+@w+(.w+)+$/;
if(!address.match(mailreg)){
alert(" Incorrect mailbox format ");
matchResult=false;
}
}
if(matchResult==true){
if(userName.charAt(0)>=0&&userName.charAt(0)<=9){
alert(" Username cannot start with a numeric character! ");
matchResult=false;
}
}
return matchResult;
}
</script>
<title> User registration and verification </title>
</head>
<body>
<center>
<form name="loginForm" action="http://www.ytu.edu.cn" onsubmit="return login()" method="post">
<table bgcolor="#6666FF" width="300" cellspacing="0" cellpadding="0" border="0" align="left" valign="top">
<tr>
<td class="table-title" colspan="2" align="center" bgcolor="#3366FF"> User registration </td>
</tr>
<tr>
<td width="130" height="28" align="left"> Login username </td>
<td><input id="userName" name="userName" type="text" class="input"></td>
</tr>
<tr>
<td width="80" height="28" align="left"> The login password </td>
<td><input id="pwd" name="pwd" type="password" class="input"></td>
</tr>
<tr>
<td width="80" height="28" align="left"> Duplicate password </td>
<td><input id="repwd" name="repwd" type="password" class="input"></td>
</tr>
<tr>
<td width="80" height="28" align="left"> Valid email address </td>
<td><input id="address" name="address" type="text" class="input"></td>
</tr>
<tr>
<!--<td width="10" height="28" align="left"></td>-->
<td colspan="2">
<input type="submit" value=" The login ">
<input type="button" value=" cancel " onClick="reset()"></td>
</tr>
</table>
</form>
</center>
</body>
</html>
Effect realization:
< img SRC = "border = 0 / / files.jb51.net/file_images/article/201311/201311191619256.gif? 20131019161942 ">