Password Validation

[kas]

I need code that includes a while{} construct to ensure that a user enters a valid password into a prompt dialogue box.  Valid passwords include at least 6 characters and begin with the number 5.  The validation should be triggered by the click event of the commend button cmdValidatePassword that should call the function validatePassword().

[roopurt18]

Use regular expressions:

http://www.w3schools.com/JS/js_obj_regexp.asp

 

The regexp you would use would be something like:

/5[a-zA-Z]{5}/

 

Your while construct would be something like:

var pass = "";
do{
  // not sure if i'm using prompt() correctly, look it up online (maybe confirm?)
  pass = prompt( "Enter a password" );
}while( /* pass fails regexp */ );

// pass is now valid, do whatever

[kas]

That would be simplier but its actually for my coursework. Here is what I have. Any suggestions ?

 

<script language="javascript">

function cmdValidatePassword()

{

var strPassword=(prompt("Validate Password", "Enter Password"));

//This will prompt you for the password

while (strPassword.length < 6 || strPassword.charAt(0)!=5)

// this sets the password to start with 5 and must be at least 6 characters long

{

strPassword=(prompt("Validate Password", "Enter Password"));

}

alert("Password Valid");

//The alert notifies you that a valid password has been entered

}

 

</script>

[roopurt18]

Put double quotes around 5 so that it's a character and not a number.