Password Validation....

[pranavcool]

Hi, I have a form Changepassword.aspx. In that i have password field.I want that password field should accept at least 1 numeric 1 alphanumeric and it should be minimum 7 characters long and maximum 20 characters. how can i do that using java script or in c#. Please provide any helpful link related to this or provide me some code to achieve this task. regards,

Pranav Dave

[tasumisra]

Loop through each character of the password and count the numeric,alphanumeric or special character as per your requirement... if any of the counter is zero show the messagebox and dont let user to proced.. :)

vikas da

[Paddy Boyd]

As per the first answer, or you could use a regular expression to validate the input. Has the advantage of only the expression needing to change if you decide to change your validation.

[Ranjit Viswakumar]

Here you go. I used this script on one of my sites-

function validatePassword(fld) {
var error ="";
var pwdFilter = /^\w*(?=\w*\d)(?=\w*[a-z])(?=\w*[A-Z])\w*$/ ;

if (fld.value.length < 7 || fld.value.length > 20) {
error += "-Password must be 7-20 characters\n";
}
if (!pwdFilter.test(tfld)) {
error += "-Password must contain at least 1 number, lowercase, and uppercase\n";
}

if (error != "") {
alert("Some fields need correction:\n" + error);
return false;
}
return true;
}

That is the Javascript validation. You can call it onSubmit of a form-

<form method=POST action=register.aspx name=demo onSubmit='return validateForm(this)'>

Try that out. Good luck! Ranjit Viswakumar Professional Services Specialist HostMySite.com[^]

[J4amieC]

If you have the regular expression, just use a RegularExpressionValidator. Saves wiring up your own validation routine!

[johnpro77]

Asp.Net Validation Controls Open This URL jpsprince.blogspot.com/2009/02/aspnet-validation-controls.html