Javascript function validator

Question

im trying to create a javascript classroom validator that checks if the user enters a valid classroom number.

Rules: Must be 4 digits Must be in the format of: 2 Capital Leters followed by 2 digits

What i have so far. this only checks for the length. im not sure how to go about doing the other validator.

function classRoom_validate(CLASS, max)
{
    var CLASS_len = CLASS.value.length;
    if (CLASS_len != max && CLASS.value.match()
{
    alert("Invalid classroom");
    CLASS.focus();
    return false;
}
return true;
}

Is this homework? If yes, add the homework tag.

Rob W
– Rob W

2012-03-20 20:47:08 +00:00
Commented Mar 20, 2012 at 20:47 — Rob W
– Rob W, Commented Mar 20, 2012 at 20:47

Collin Green · Accepted Answer · 2012-03-20 20:48:14Z

3

You need a regular expression:

r = /[A-Z][A-Z]\d\d/

r.test('AA21')
true

r.test('blah')
false

answered Mar 20, 2012 at 20:48

Collin Green

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Comments

bevacqua · Accepted Answer · 2012-03-20 20:48:46Z

1

Use a Regex like this:

/[A-Z]{2}[0-9]{2}/.test(code);

/[A-Z]{2}[0-9]{2}/.test("AA12"); // true
/[A-Z]{2}[0-9]{2}/.test("Ab12"); // false
/[A-Z]{2}[0-9]{2}/.test("Abc2"); // false

etc

answered Mar 20, 2012 at 20:48

bevacqua

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