Javascript function to validate password

Question

I wanna validate an input of password

<form name="regist" action="proc/regist.php" onsubmit="return validate_form1()" method="post">
<p>Your Username:   <input type="text" name="regist_name" /></p>
<p>Your Password:   <input type="password" name="regist_password1"/> at least 6 characters</p>
<p>Repeat Password: <input type="password" name="regist_password2" /></p>
<input type="submit" value="Register NOW">

i tried to set the function like this :

function validate_form1(){
    if(regist_password1.length<6){
        alert("Your password is too short , please try again!");
        return false;
    }
}

maybe the problem is in "regist_password1.length" .

James Allardice · Accepted Answer · 2011-12-12 22:21:56Z

2

I'm assuming regist_password1 (which is the id of the input element) is not a variable containing the value of the input, which is what it needs to be:

if(document.getElementById("regist_password1").value.length < 6) {
    //Failed
}

In your current code, regist_password1 will be undefined (assuming you haven't declared it as a global variable outside of the validation function.

answered Dec 12, 2011 at 22:21

James Allardice

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SLaks · Accepted Answer · 2011-12-12 22:21:23Z

0

You need to give the element an ID, then call document.getElementById('some ID').

answered Dec 12, 2011 at 22:21

SLaks

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