The following Javascript code is used to check whether the given password satisfies the following rules
1. Password should have at least 8 characters.
2. Password should have
i) at least one upper case letter (A – Z).
ii) at least one lower case letter(a-z).
iii) At least one digit (0 – 9) .
iv) at least one special Characters of !@#$%&*()
Depending upon number of rules satised, we can decide password complexity whether it is strong or medium or weak. (For eg. if all the rules satisfied , then the password is strong , …)
The following code gives alert message if any one of the above condition is not satisfied.
In two ways we can write the javascript code .
Method 1 -> Using Regular Expressions.
Method 2 -> Using simple javascript code.
//Method 1 using REGEX starts
function isStrongPwd1(password) {
var regExp = /(?=.*\d)(?=.*[a-z])(?=.*[A-Z])(?=.*[!@#$%&*()]).{8,}/;
var validPassword = regExp.test(password);
return validPassword;
}
//Method 1 ends here
//Method 2 starts heare
function isStrongPwd2(password) {
var uppercase = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
var lowercase = "abcdefghijklmnopqrstuvwxyz";
var digits = "0123456789";
var splChars ="!@#$%&*()";
var ucaseFlag = contains(password, uppercase);
var lcaseFlag = contains(password, lowercase);
var digitsFlag = contains(password, digits);
var splCharsFlag = contains(password, splChars);
if(password.length>=8 && ucaseFlag && lcaseFlag && digitsFlag && splCharsFlag)
return true;
else
return false;
}
function contains(password, allowedChars) {
for (i = 0; i < password.length; i++) {
var char = password.charAt(i);
if (allowedChars.indexOf(char) >= 0) { return true; }
}
return false;
}
//Method 2 ends here
//Calling function starts here
function submitDetails()
{
var password=document.testForm.password1.value;
var message="The password must have atleast 8 chars with one uppercase letter, one lower case letter, one digit and one of !@#$%&*()";
// Calling method1
if(!isStrongPwd1(password)) {
alert(message);
success=false;
}
// Calling method2
if(!isStrongPwd2(password)) {
alert(message);
success=false;
}
}
//Calling function ends here
//Input form for password
<body>
<form name="testForm">
<input type="password" name="password1" />
<input type="submit" name="submitb" value="Submit" onClick="javascript:submitDetails()"/>
</form>
</body>