<!DOCTYPE html>
<html>
<head>
<title></title>
<style>
#password_error{
color:red;
}
</style>
</head>
<body>
<p>
<label for="password">Password</label>
<input type="text" id="password">
<span id="password_error"></span>
</p>
<p>
<button type="submit" id="register_button">Register</button>
</p>
</body>
</html>
<script type="text/javascript">
document.getElementById("register_button").addEventListener("click",function(){
let password=document.getElementById("password");
let password_error=document.getElementById("password_error");
let error=false;
if(check_password(/[a-z]{1,8}/ig, password.value)){
error=false;
}
else{
error=true;
password_error.innerHTML="Password must contain alphabet.";
return false;
}
if(check_password(/[0-9]{1,8}/ig, password.value)){
error=false;
}
else{
error=true;
password_error.innerHTML="Password must contain a digit.";
return false;
}
if(check_password(/[@#$%^&*()]{1,8}/ig, password.value)){
error=false;
}
else{
error=true;
password_error.innerHTML="Password must contain special character one of them @#$%^&*()";
return false;
}
if(password.value.length>=8 && password.value.length<=20){
error=false;
}
else{
error=true;
password_error.innerHTML="Password length must between 8 to 20 character";
return false;
}
if(!error){
alert("valid");
}
else{
}
});
function check_password(pattern, data){
if(pattern.test(data)){
return true;
password_error.innerHTML="";
}
else{
return false;
}
}
</script>
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Password pattern accept atleast one alphabet digit and special character using JS
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