Can anyone help me with JavaScript form validation?

Question

I have created a validate function using JavaScript. I need a validation that tests that password field in a form to make sure it is:

At least 8 characters.
Contains a numeric value.
Contains an alphabetic value.

I just need an If statement inside my validate function

function Validate()
{
    with(document.memberInfo) {

        evt = new userInfo(username.value, password.value, email.value, firstname.value, lastname.value, age.value, description.value);
    }

    with(evt)
{
    if((email.indexOf("@",0)==-1))
    {
        alert("The email must contain the @ symbol.");
        return false;
    }






    evt.printEvent();
}
return true;
}

This isn't a free code writing service. You should show what you have tried, what you expected the result to be and what you got, including any errors. — RobG, May 19 '16 at 06:13
@RobG I have added my function and it works I just need help creating an if statement that validates the password section of my HTML form. My apologies I'm new to the site and I'm a programming student — Jasmin Kenjar, May 19 '16 at 20:16

score 0 · Answer 1 · edited May 23 '17 at 12:31

0

you can use regex "/^(?=.*[0-9])(?=.*[a-zA-Z]).{8,}$/" refer this link stackoverflow

JsFiddle

var regex = /^(?=.*[0-9])(?=.*[a-zA-Z]).{8,}$/;

function getValue()  {
    return document.getElementById("myinput").value;
}

function test() {
    alert(regex.test(getValue()));
}

function match() {
    alert(getValue().match(regex));    
}

<input type="text" id="myinput" value="vexillology"/>
<button id="testBtn" onclick=test()>test</button>
<button id="matchBtn" onclick=match()>match</button>

edited May 23 '17 at 12:31

Community

1
1

answered May 19 '16 at 06:06

nisar

1,055
2
11
26

This restricts the password to only being alphanumeric though. – 4castle May 19 '16 at 06:16
That's not correct. That requires that there are at least 7 characters after the first group of alphanumeric characters. I think you just want `.{8,}` – 4castle May 19 '16 at 06:44

score 0 · Answer 2 · answered May 19 '16 at 06:18

0

using regx function you can validate ur form . here is the code .

var xstr="^(?=.*[A-Za-z])(?=.*\d)[A-Za-z\d]{8,}$";
var str=Document.getElementById("id").value;
    var ck=xstr.exec(str);
    if(!ck || ck[0]!=str){
       //code
    }

answered May 19 '16 at 06:18

Nihar Sarkar

1,187
1
13
26

4castle · Answer 3 · 2016-05-19T06:49:30.717

Using regex is the way to go, but the more readable solution is probably:

function isValid(pass) {
    return pass.length >= 8 &&    // at least 8 characters
           /\d/.test(pass)  &&    // contains a digit
           /[A-Za-z]/.test(pass); // contains a letter
}

function isValid(pass) {
  return pass.length >= 8 &&
         /\d/.test(pass)  &&
         /[A-Za-z]/.test(pass);
}

var field = document.getElementById("password");
var output = document.getElementById("output");

field.onkeyup = function() {
  output.innerHTML = isValid(field.value) ? "Valid" : "Not Valid";
}

<input type="text" id="password" placeholder="Enter password" />
<span id="output"></span>

Alternatively, you can put it all in one regex:

function isValid(pass) {
    return /^(?=.*[A-Za-z])(?=.*\d).{8,}$/.test(pass);
}

JSFiddle

Can anyone help me with JavaScript form validation?

3 Answers3